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Disclosed are oxime ester compounds which have specific benzo (unsaturated 5-membered ring)-carbonyl group and their use as photoinitiators in photopolymerizable compositions, in particular in photoresist formulations for display applications, e.g. liquid crystal display (LCD), organic light emittin

Disclosed are oxime ester compounds which have specific benzo (unsaturated 5-membered ring)-carbonyl group and their use as photoinitiators in photopolymerizable compositions, in particular in photoresist formulations for display applications, e.g. liquid crystal display (LCD), organic light emitting diode (OLED) and touch panel.

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1. Compounds of formulae (I) wherein X is A is O, S, NR5 or CR16R17;R1 is selected from: hydrogen, or C1-C20alkyl which is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, OR3, SR4, NR5R6, CN, (CO)OR3, (CO)NR5R6, C3-C8cycloalkyl, C3-C8cycloalk

1. Compounds of formulae (I) wherein X is A is O, S, NR5 or CR16R17;R1 is selected from: hydrogen, or C1-C20alkyl which is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, OR3, SR4, NR5R6, CN, (CO)OR3, (CO)NR5R6, C3-C8cycloalkyl, C3-C8cycloalkyl which is interrupted by one or more O, S, CO or NR5, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl and C3-C20heteroarylcarbonyl, of which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl orC3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3, SR4 or NR5R6; or R1 is C2-C20alkyl interrupted by one or more O, S, NR5, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted or substituted by one or more C3-C8cycloalkyl, OH, SH, O(CO)R1a, (CO)OR3, (CO)NR5R6, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, C1-C8alkyl, OR3, SR4 or NR5R6; R1 is C2-C12alkenyl or C3-C20cycloalkyl, each of which is uninterrupted, or interrupted by one or more O, S, CO, NR5 or COOR3;R1 is C6-C20aryl or C3-C20heteroaryl, each of which is unsubstituted, or substituted by one or more halogen, C1-C20alkyl, C1-C4haloalkyl, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, CN, NO2, OR3, SR4, NR5R6, COOR3, (CO)R1a or SO2-R1a;R1 is C1-C20alkoxy, which is unsubstituted, or substituted by one or more C1-C10alkyl, C1-C4haloalkyl, halogen, phenyl, C1-C20alkylphenyl or C1-C8alkoxyphenyl;R1 is C2-C20alkoxy, which is interrupted by one or more O, S, NR5, CO, SO or SO2;R1 is C6-C20aryloxy or C3-C20heteroaryloxy, which is unsubstituted, or substituted by one or more halogen, C1-C20alkyl, C1-C4haloalkyl, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, CN, NO2, OR3, SR4, NR5R6, COOR3, (CO)R1a or SO2R1a; orR1 is R1a, and R1a is selected from hydrogen, or C1-C20alkyl which is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, OR3a, SR4a, NR5aR6a, CN, (CO)OR3a, (CO)NR5aR6a, C3-C8cycloalkyl which is uninterrupted, or interrupted by one or more O, S, CO or NR5a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl andC3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3a, SR4a or NR5aR6a; R1a is C2-C20alkyl interrupted by one or more O, S, NR5a, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted, or substituted by one or more C3-C8cycloalkyl, OH, SH, O(CO)—(C1-C8alkyl), (CO)OR3a, (CO)NR5aR6a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, C1-C8alkyl, OR3a, SR4a or NR5aR6a;R1a is C2-C12alkenyl or C3-C20cycloalkyl, each of which is uninterrupted or interrupted by one or more O, S, CO, NR5a or COOR3a;R1a is C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted or substituted by one or more halogen, C1-C20alkyl, C1-C4haloalkyl, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, CN, NO2, OR3a, SR4a, NR5aR6a, COOR3a, (CO)—(C1-C8alkyl), benzoyl or SO2—(C1-C4haloalkyl);R1a is C1-C20alkoxy, which is unsubstituted or substituted by one or more C1-C10alkyl, C1-C4haloalkyl, halogen, phenyl, C1-C20alkylphenyl or C1-C8alkoxyphenyl;R1a , is C2-C20alkoxy, which is interrupted by one or more O, S, NR5a, CO, SO or SO2; or R1a is C6-C20aryloxy or C3-C20heteroaryloxy, which C6-C20aryloxy or C3-C20heteroaryloxy is unsubstituted, or substituted by one or more halogen, C1-C20alkyl, C1-C4haloalkyl, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, CN, NO2, OR3a, SR4a, NR5aR6a, COOR3a, (CO)(C1-C8alkyl), SO2—(C1-C4haloalkyl), benzoyl, or  which benzoyl or  is unsubstituted, or substituted by R2 is C1-C20alkyl which is substituted by C3-C8cycloalkylR3 is selected from hydrogen, (CO)R1a, (CO)OR3a, CONR5R6, C1-C20alkyl, which is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, OR3a, SR4a, NR5aR6a, CN, (CO)OR3a, (CO)NR5aR6a, PO(OR1a)2, S(O)mR1a, C3-C8cycloalkyl which is uninterrupted or interrupted by one or more O, S, CO or NR5a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl and C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3a, SR4a, NR5aR6a, PO(OR1a)2 or S(O)mR1a;R3 is C2-C20alkyl interrupted by one or more O, S, NR5a, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted, or substituted by one or more C3-C8cycloalkyl, OH, SH, O(CO)R1a, (CO)OR3a, (CO)NR5aR6a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, C1-C8alkyl, OR3a, SR4a or NR5aR6a; R3 is C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted, or interrupted by one or more O, S, CO, NR5a or COOR3a;R3 is C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, OR3a, SR4a, NR5aR6a, COOR3a, (CO)R1a(CO)NR5aR6a, PO(OR1a)2, S(O)mR1a,  C1-C20alkyl which is unsubstituted, or substituted by one or more halogen, COOR3a, CONR5aR6a, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3a, SR4a or NR5aR6a, C2-C20alkyl which is interrupted by one or more O, S or NR5a; phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted, or substituted by one or more OR3a, SR4a or NR5aR6a;R3 together with one of the carbon atoms of R2 or M forms a 5- or 6-membered saturated or unsaturated ring which is uninterrupted, or interrupted by O, S or NR5a, and which 5- or 6-membered saturated or unsaturated ring is unsubstituted, or substituted by one or more C1-C20alkyl, OR3a, SR4a, NR5aR6a, (CO)R1a, NO2, halogen, C1-C4-haloalkyl, CN, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl,  or C3-C20cyclalkyl which is uninterrupted or interrupted by one or more O, S, CO or NR5a; orR3 is R3a, and R3a is selected from hydrogen, (CO)O(C1-C8alkyl) or CON(C1-C8alkyl)2; R3a is C1-C20alkyl which is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, OH, SH, CN, C3-C8alkenoxy, OCH2CH2CN, OCH2CH2(CO)O(C1-C8alkyl), O(CO)(C1-C8alkyl), O(CO)(C2-C4)alkenyl, O(CO)phenyl, (CO)OH, (CO)O(C1-C8alkyl), C3-C8cycloalkyl, SO2(C1-C4haloalkyl), O(C1-C4haloalkyl), phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl and C3-C8cycloalkyl which is interrupted by one or more O;R3a is C2-C20alkyl interrupted by one or more O, S, N(C1-C8alkyl), CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted, or substituted by one or more C3-C8cycloalkyl, OH, SH, O(CO)(C1-C8alkyl), (CO)O(C1-C8alkyl), (CO)N(C1-C8alkyl)2, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, C1-C8alkyl, C1-C8alkoxy, C1-C8alkylsulfanyl or N(C1-C8alkyl)2;R3a is C2-C12alkenyl or C3-C8cycloalkyl, which C2-C12alkenyl or C3-C8cycloalkyl is uninterrupted, or interrupted by one or more O, S, CO, N(C1-C8alkyl) or COO(C1-C8alkyl); or R3a is C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, CN, NO2, OH, C1-C8alkyl, C1-C4haloalkyl, C1-C8alkoxy, phenyl-C1-C3alkyloxy, phenoxy, C1-C8alkylsulfanyl, phenylsulfanyl, N(C1-C8alkyl)2, diphenylamino, (CO)O(C1-C8alkyl), (CO)C1-C8alkyl or (CO)N(C1-C8)2, phenyl or benzoyl; orR3a is C1-C20alkanoyl or C3-C12alkenoyl, which C1-C20alkanoyl or C3-C12alkenoyl is unsubstituted or substituted by one or more halogen, phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl, OH, C1-C8alkoxy, phenoxy, C1-C8alkylsulfanyl, phenylsulfanyl, N(C1-C8alkyl)2 or diphenylamino;R4 is selected from hydrogen, C1-C20alkyl which is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, OR3a, SR4a, NR5aR6a, CN, (CO)OR3a, (CO)NR5aR6a, PO(OR1a)2, S(O)mR1a, C3-C8cycloalkyl which is uninterrupted, or interrupted by one or more O, S, CO or NR5a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl and C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3a, SR4a, NR5aR6a, PO(OR1a)2 or S(O)mR1a; R4 is C2-C20alkyl interrupted by one or more O, S, NR5a, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted, or substituted by one or more C3-C8cycloalkyl, OH, SH, O(CO)R1a, (CO)OR3a, (CO)NR5aR6a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, C1-C8alkyl, OR3a, SR4a or NR5aR6a;R4 is C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted, or interrupted by one or more O, S, CO, NR5a or COOR3a;R4 is C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, OR3a, SR4a, NR5aR6a, COOR3a, (CO)R1a(CO)NR5aR6a, PO(OR1a)2, S(O)mR1a,  C1-C20alkyl which is unsubstituted, or substituted by one or more halogen, COOR3a, CONR5aR6a, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3a, SR4a or NR5aR6a, C2-C20alkyl which is interrupted by one or more O, S or NR5a, phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted, or substituted by OR3a, SR4a or NR5aR6a;R4 together with one of the carbon atoms of R2 or M forms a 5- or 6-membered saturated or unsaturated ring which is uninterrupted, or interrupted by O, S or NR5a, and which 5- or 6-membered saturated or unsaturated ring is unsubstituted or substituted by one or more C1-C20alkyl, OR3a, SR4a, NR5aR6a, (CO)R1a, NO2, halogen, C1-C4-haloalkyl, CN, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl,  or C3-C20cyclalkyl which is uninterrupted, or interrupted by one or more O, S, CO or NR5a; orR4 is R4a, and R4a is selected from hydrogen, C1-C20alkyl which is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, OH, SH, CN, C3-C8alkenoxy, OCH2CH2CN, OCH2CH2(CO)O(C1-C8alkyl), O(CO)(C1-C8alkyl), O(CO)(C2-C4)alkenyl, O(CO)phenyl, (CO)OH, (CO)O(C1-C8alkyl), C3-C8cycloalkyl, SO2(C1-C4haloalkyl), O(C1-C4haloalkyl), phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl and C3-C8cycloalkyl which is interrupted by one or more O;R4a is C2-C20alkyl interrupted by one or more O, S, N(C1-C8alkyl), CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted, or substituted by one or more C3-C8cycloalkyl, OH, SH, O(CO)(C1-C8alkyl), (CO)O(C1-C8alkyl), (CO)N(C1-C8alkyl)2, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, C1-C8alkyl, C1-C8alkoxy, C1-C8alkylsulfanyl or N(C1-C8alkyl)2; R4a is C2-C12alkenyl or C3-C8cycloalkyl, which C2-C12alkenyl or C3-C8cycloalkyl is uninterrupted, or interrupted by one or more O, S, CO, N(C1-C8alkyl) or COO(C1-C8alkyl);R4a is C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, CN, NO2, OH, C1-C8alkyl, C1-C4haloalkyl, C1-C8alkoxy, phenyl-C1-C3alkyloxy, phenoxy, C1-C8alkylsulfanyl, phenylsulfanyl, N(C1-C8alkyl)2, diphenylamino, (CO)O(C1-C8alkyl), (CO)C1-C8alkyl, (CO)N(C1-C8)2, phenyl or benzoyl; orR4a is C1-C20alkanoyl or C3-C12alkenoyl, which C1-C20alkanoyl or C3-C12alkenoyl is unsubstituted, or substituted by one or more halogen, phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl, OH, C1-C8alkoxy, phenoxy, C1-C8alkylsulfanyl, phenylsulfanyl, N(C1-C8alkyl)2 or diphenylamino;R5 and R6 independently of each other are hydrogen, S(O)mR1a, O(CO)R1a, (CO)R1a or CONR5aR6a; R5 and R6 independently of each other are C1-C20alkyl which is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, OR3a, SR4a, NR5aR6a, CN, (CO)OR3a, (CO)NR5aR6a, PO(OR1a)2, S(O)mR1a, C3-C8cycloalkyl, which is uninterrupted, or interrupted by one or more O, S, CO or NR5a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl and C3-C20heteroarylcarbonyl, of which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3a, SR4a, NR5aR6a, PO(OR1a)2 or S(O)mR1a;R5 and R6 independently of each other are C2-C20alkyl interrupted by one or more O, S, NR5a, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted, or substituted by one or more C3-C8cycloalkyl, OH, SH, O(CO)R1a, (CO)OR3a, (CO)NR5aR6a, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted, or substituted by one or more halogen, C1-C8alkyl, OR3a, SR4a or NR5aR6a;R5 and R6 independently of each other are C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted, or interrupted by one or more O, S, CO, NR5a or COOR3a;R5 and R6 independently of each other are C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted, or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, OR3a, SR4a, NR5aR6a, COOR3a, (CO)R1a (CO)NR5aR6a, PO(OR1a)2, S(O)mR1a,  C1-C20alkyl, which is unsubstituted, or substituted by one or more halogen, COOR3a, CONR5aR6a, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3a, SR4a or NR5aR6a, C2-C20alkyl which is interrupted by one or more O, S or NR5a, phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted, or substituted by OR3a, SR4a or NR5aR6a;R5 and R6 independently of each other are C1-C20alkoxy, which is unsubstituted, or substituted by one or more halogen, phenyl, C1-C8alkylphenyl or C1-C8alkoxyphenyl;R5 and R6 independently of each other are C2-C20alkoxy, which is interrupted by one or more O, S, NR5a, CO, SO or SO2;R5 and R6 independently of each other are C6-C20aryloxy or C3-C20heteroaryloxy, which C6-C20aryloxy or C3-C20heteroaryloxy is unsubstituted, or substituted by one or more halogen, C1-C8alkyl, C1-C4haloalkyl, phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl, CN, NO2, OR3a, SR4a, NR5aR6a, COOR3a, (CO)R1a or SO2R1a;R5 together with one of the carbon atoms of R2 or M forms a 5- or 6-membered saturated or unsaturated ring which is uninterrupted, or interrupted by O, S or NR5a, and which 5- or 6-membered saturated or unsaturated ring is unsubstituted, or substituted by one or more C1-C20alkyl, OR3a, SR4a, NR5aR6a, (CO)R1a, NO2, halogen, C1-C4-haloalkyl, CN, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl,  or C3-C20cyclalkyl, which is uninterrupted or interrupted by one or more O, S, CO or NR5a;R5 and R6 together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which is uninterrupted, or interrupted by O, S or NR5a, and which 5- or 6-membered saturated or unsaturated ring is unsubstituted, or substituted by one or more C1-C20alkyl, OR3a, SR4a, NR5aR6a, (CO)R1a, NO2, halogen, C1-C4-haloalkyl, CN, phenyl,  or C3-C20cyclalkyl which is uninterrupted, or interrupted by one or more O, S, CO or NR5a; orR5 and R6 is R5a and R6a, and R5a and R6a are independently of each other are hydrogen, C1-C20alkyl, S(O)m(C1-C8alkyl), O(CO)(C1-C8alkyl), (CO)(C1-C8alkyl), (CO)O(C1-C8alkyl) or CON(C1-C8alkyl)2; R5a and R6a independently of each other are C1-C20alkyl substituted by one or more halogen, OH, SH, CN, C3-C8alkenoxy, OCH2CH2CN, OCH2CH2(CO)O(C1-C8alkyl), O(CO)(C1-C8alkyl), O(CO)(C2-C4)alkenyl, O(CO)phenyl, (CO)OH, (CO)O(C1-C8alkyl), C3-C8cycloalkyl, SO2(C1-C4haloalkyl), O(C1-C4haloalkyl), phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl, C3-C8cycloalkyl or C3-C8cycloalkyl which is interrupted by one or more O;or R5a and R6a independently of each other are C2-C20alkyl interrupted by one or more O, S, N(C1-C8alkyl), CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted or substituted by C3-C8cycloalkyl, OH, SH, O(CO)(C1-C8alkyl), (CO)O(C1-C8alkyl), (CO)N(C1-C8alkyl)2, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, C1-C8alkyl, C1-C8alkoxy, C1-C8alkylsulfanyl or N(C1-C8alkyl)2; R5a and R6a independently of each other are C2-C12alkenyl or C3-C8cycloalkyl, which C2-C12alkenyl or C3-C8cycloalkyl is uninterrupted or interrupted by one or more O, S, CO, N(C1-C8alkyl) or COO(C1-C8alkyl);R5a and R6a independently of each other are C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, CN, NO2, OH, C1-C8alkyl, C1-C4haloalkyl, C1-C8alkoxy, phenyl-C1-C3alkyloxy, phenoxy, C1-C8alkylsulfanyl, phenylsulfanyl, N(C1-C8alkyl)2, diphenylamino, (CO)O(C1-C8alkyl), (CO)C1-C8alkyl, (CO)N(C1-C8alkyl)2, phenyl or benzoyl;R5a and R6a independently of each other are C1-C20alkanoyl or C3-C12alkenoyl, which C1-C20alkanoyl or C3-C12alkenoyl is unsubstituted or substituted by one or more halogen, phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl, OH, C1-C8alkoxy, phenoxy, C1-C8alkylsulfanyl, phenylsulfanyl, N(C1-C8alkyl)2 or diphenylamino;R5a and R6a independently of each other are C1-C20alkoxy, which is unsubstituted or substituted by one or more halogen, phenyl, C1-C8alkylphenyl or C1-C8alkoxyphenyl;or R5a and R6a independently of each other are C2-C20alkoxy, which is interrupted by one or more O, S, N(C1-C8alkyl), CO, SO or SO2;R5a and R6a independently of each other are C6-C20aryloxy or C3-C20heteroaryloxy, which C6-C20aryloxy or C3-C20heteroaryloxy is unsubstituted or substituted by one or more halogen, C1-C8alkyl, C1-C4haloalkyl, phenyl, C1-C8alkylphenyl, C1-C8alkoxyphenyl, CN, NO2, C1-C8alkoxy, C1-C8alkylsulfanyl, N(C1-C8alkyl)2, CO(OC1-C8alkyl), (CO)(C1-C8alkyl) or SO2—(C1-C8alkyl); orR5a and R6a together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which is uninterrupted or interrupted by O, S or N(C1-C8alkyl), and which 5- or 6-membered saturated or unsaturated ring is unsubstituted or substituted by one or more C1-C8alkyl, C1-C8alkoxy, C1-C8alkylsulfanyl, N(C1-C8alkyl)2, NO2, halogen, C1-C4haloalkyl, CN, phenyl or C3-C20cyclalkyl which is uninterrupted or interrupted by one or more O, S, CO or N(C1-C8alkyl);R7, R8, R9, R10 and R11 independently of each other are hydrogen, C1-C20alkyl, halogen, CN, NO2, OR3, SR4, NR5R6, COOR3, (CO)R1a, (CO)NR5R6, PO(OR1a)2, S(O)mR1a,  wherein the substituents OR3, SR4 or NR5R6 optionally form 5- or 6-membered ring via the radicals R3, R4, R5 or R6 with further substituents on the group X;or R7, R8, R9, R10 and R11 independently of each other are C1-C20alkyl substituted by one or more substituents selected from the group consisting of halogen, OR3, SR4, NR5R6, CN, (CO)OR3, (CO)NR5R6, PO(OR1a)2, S(O)mR1a, C3-C8cycloalkyl which is uninterrupted or interrupted by one or more O, S, CO or NR5, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl and C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3, SR4, NR5R6, PO(OR1a)2 or S(O)mR1a; R7, R8, R9, R10 and R11 independently of each other are C2-C20alkyl interrupted by one or more O, S, NR5, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted or substituted by C3-C8cycloalkyl, OH, SH, O(CO)R1a, (CO)OR3, (CO)NR5R6, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, C1-C8alkyl, OR3, SR4 or NR5R6;R7, R8, R9, R10 and R11 independently of each other are C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted or interrupted by one or more O, S, CO, NR5 or COOR3; orR7, R8, R9, R10 and R11 independently of each other are C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, OR3, SR4, NR5R6, COOR3, (CO)R1a(CO)NR5R6, PO(OR1a)2, S(O)mR1a,  C1-C20alkyl, which is unsubstituted or substituted by one or more halogen, COOR3, CONR5R6, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3, SR4 or NR5R6, C2-C20alkyl which is interrupted by one or more O, S or NR5, phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted, or substituted by OR3, SR4 or NR5R6;or R8 and R9, R9 and R10, or R10 and R11 are R12, R13, R14 and R15 independently of each other are hydrogen, C1-C20alkyl, halogen, CN, NO2, OR3, SR4, NR5R6, COOR3, (CO)R1a, (CO)NR5R6, PO(OR1a)2, S(O)mR1a,  wherein the substituents OR3, SR4 or NR5R6 optionally form a 5- or 6-membered ring via the radicals R3, R4, R5 or R6 with further substituents on the group X;or R12, R13, R14 and R15 independently of each other are C1-C20alkyl substituted by one or more substituents selected from the group consisting of halogen, OR3, SR4, NR5R6, CN, (CO)OR3, (CO)NR5R6, PO(OR1a)2, S(O)mR1a, C3-C8cycloalkyl which is uninterrupted or interrupted by one or more O, S, CO or NR5, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl and C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3, SR4, NR5R6, PO(OR1a)2 or S(O)mR1a; R12, R13, R14 and R15 independently of each other are C2-C20alkyl interrupted by one or more O, S, NR5, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted or substituted by C3-C8cycloalkyl, OH, SH, O(CO)R1a, (CO)OR3, (CO)NR5R6, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, C1-C8alkyl, OR3, SR4 or NR5R6;R12, R13, R14 and R15 independently of each other are C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted or interrupted by one or more O, S, CO, NR5 or COOR3;R12, R13, R14 and R15 independently of each other are C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, OR3, SR4, NR5R6, COOR3, (CO)R1a, (CO)NR5R6, PO(OR1a)2, S(O)m—R1a,  C1-C20alkyl, which is unsubstituted or substituted by one or more halogen, COOR3a, CONR5R6, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3, SR4 or NR5R6, C2-C20alkyl which is interrupted by one or more O, S or NR5, phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted or substituted by OR3, SR4 or NR5R6;R16 and R17 independently of each other are hydrogen, C1-C20alkyl, which is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, OR3, SR4, NR5R6, CN, (CO)OR3, (CO)NR5R6, C3-C8cycloalkyl which is uninterrupted or interrupted by one or more O, S, CO or NR5, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl and C3-C20heteroarylcarbonyl, which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, C1-C4haloalkyl, CN, NO2, OR3, SR4 or NR5R6; R16 and R17 independently of each other are C2-C20alkyl interrupted by one or more O, S, NR5, CO, SO or SO2, which interrupted C2-C20alkyl is unsubstituted or substituted by C3-C8cycloalkyl, OH, SH, O(CO)R1a, (CO)OR3, (CO)NR5R6, C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl, wherein C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl or C3-C20heteroarylcarbonyl is unsubstituted or substituted by one or more halogen, C1-C8alkyl, OR3, SR4 or NR5R6;R16 and R17 independently of each other are C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted or interrupted by one or more O, S, CO, NR5 or COOR3;R16 and R17 independently of each other are C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted or substituted by one or more halogen, C1-C20alkyl, C1-C4haloalkyl, phenyl, C1-C20alkylphenyl, C1-C8alkoxyphenyl, CN, NO2, OR3, SR4, NR5R6, COOR3, (CO)R1a or SO2R1a; orR16 and R17 together with the carbon atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which is uninterrupted or interrupted by O, S or NR5a, and which 5- or 6-membered saturated or unsaturated ring is unsubstituted or substituted by one or more C1-C20alkyl, OR3a, SR4a, NR5aR6a, (CO)R1a, NO2, halogen, C1-C4haloalkyl, CN, phenyl or C3-C20cyclalkyl which is uninterrupted or interrupted by one or more O, S, CO or NR5a;Ar1 is C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl, C3-C20heteroarylcarbonyl or  which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl, C3-C20heteroarylcarbonyl or  is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, COOR3, (CO)R1a, (CO)NR5R6, PO(OR1a)2, S(O)mR1a,  OR3, SR4, NR5R6, wherein the substituents OR3, SR4 or NR5R6 optionally form 5- or 6-membered rings via the radicals R3, R4, R5 or R6 with further substituents on the phenyl ring, C1-C20alkyl which is unsubstituted or substituted by one or more halogen, COOR3, CONR5R6, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3, SR4 or NR5R6, C2-C20alkyl which is interrupted by one or more O, S or NR5, C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted or interrupted by one or more O, S, CO, NR5 or COOR3, phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted or substituted by OR3, SR4 or NR5R6;or Ar1 is Ar2 is phenylene, naphthylene, phenylenecarbonyl, naphthylenecarbonyl,  which phenylene, naphthylene, phenylenecarbonyl, naphthylenecarbonyl,  is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, COOR3, (CO)R1a, (CO)NR5R6, PO(OR1a)2, S(O)mR1a,  OR3, SR4, NR5R6, C1-C20alkyl which is unsubstituted or substituted by one or more halogen, COOR3, CONR5R6, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3, SR4 or NR5R6, C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted or interrupted by one or more O, S, CO, NR5 or COOR3, C2-C20alkyl which is interrupted by one or more O, S or NR5, phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted or substituted by OR3, SR4 or NR5R6;Y is a direct bond, O, S, NR5 or CO;Z1 is O, S, CO or CR16(R17);Z2 is a direct bond, O, S or NR5;m is 1 or 2; andQ is CO or a direct bond. 2. Compounds of the formulae (I) according to claim 1, wherein X is A is O, S, NR5 or CR16R17;R1 is C1-C20alkyl which is unsubstituted or substituted by one or more halogen, OR3, SR4, NR5R6, (CO)OR3, C3-C8cycloalkyl or C3-C8cycloalkyl which is interrupted by one or more O;or R1 is C2-C20alkyl interrupted by one or more O, which interrupted C2-C20alkyl is unsubstituted or substituted by one or more OH, O(CO)R1a or (CO)OR3;or R1 is C2-C12alkenyl or C3-C20cycloalkyl;or R1 is C6-C20aryl or C3-C20heteroaryl, each of which is unsubstituted or substituted by one or more halogen or C1-C20alkyl;or R1 is C1-C20alkoxy, C6-C20aryloxy or C3-C20heteroaryloxy;R1a is hydrogen, C1-C20alkyl, C2-C20alkyl interrupted by one or more O, C2-C12alkenyl, C3-C20cycloalkyl, C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted or substituted by one or more halogen, C1-C20alkyl, OR3a, SR4a, NR5aR6a, COOR3a, (CO)—(C1-C8alkyl) or benzoyl;or R1a is C6-C20aryloxy or C3-C20heteroaryloxy, which C6-C20aryloxy or C3-C20heteroaryloxy is unsubstituted or substituted by benzoyl, or  which benzoyl or  is unsubstituted or substituted by R3 is hydrogen, (CO)R1a, C1-C20alkyl which is unsubstituted or substituted by one or more C3-C8cycloalkyl which is uninterrupted or interrupted by one or more O;or R3 is C2-C20alkyl interrupted by one or more O, which interrupted C2-C20alkyl is unsubstituted or substituted by one or more C3-C8cycloalkyl, OH or (CO)OR3a;or R3 is C2-C12alkenyl, C3-C20cycloalkyl or C6-C20aryl, which C6-C20aryl is unsubstituted or substituted by one or more halogen or C1-C20alkyl;R3a is C1-C20alkyl;R4 is hydrogen, C1-C20alkyl which is unsubstituted or substituted by one or more OR3a, (CO)OR3a, C3-C8cycloalkyl or C6-C20aryl;or R4 is C2-C20alkyl interrupted by one or more O, which interrupted C2-C20alkyl is unsubstituted or substituted by one or more OH or (CO)OR3a;or R4 is C2-C12alkenyl or C3-C20cycloalkyl;or R4 is C6-C20aryl which is unsubstituted or substituted by one or more halogen or C2-C20alkyl which is uninterrupted or interrupted by one or more O;R4a is C1-C20alkyl;R5 and R6 independently of each other are hydrogen, C1-C20alkyl which is unsubstituted or substituted by one or more halogen, OR3a, SR4a, (CO)OR3a, C3-C8cycloalkyl or C6-C20aryl;or R5 and R6 independently of each other are C2-C20alkyl interrupted by one or more O, which interrupted C2-C20alkyl is unsubstituted or substituted by OH or SH;or R5 and R6 independently of each other are C2-C12alkenyl, C3-C20cycloalkyl or C6-C20aryl;or R5 and R6 together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which is uninterrupted or interrupted by O, S or NR5a;R5a and R6a independently of each other are hydrogen or C1-C20alkyl;R7, R8, R9, R10 and R11 independently of each other are hydrogen, C1-C20alkyl, OR3, SR4, NR5R6, COOR3, (CO)R1a;or R7, R8, R9, R10 and R11 independently of each other are C1-C20alkyl substituted by one or more halogen, OR3, SR4, NR5R6, (CO)OR3, C6-C20aryl or C3-C8cycloalkyl which is uninterrupted or interrupted by one or more O;or R7, R8, R9, R10 and R11 independently of each other are C2-C20alkyl interrupted by one or more O;or R7, R8, R9, R10 and R11 independently of each other are C6-C20aryl or C3-C20heteroaryl, which C6-C20aryl or C3-C20heteroaryl is unsubstituted or substituted by one or more halogen, OR3, SR4, NR5R6, COOR3, (CO)R1a or or R8 and R9, R9 and R10, or R10 and R11 are R12, R13, R14 and R15 independently of each other are hydrogen or C1-C20alkyl;Ar1 is C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl, C3-C20heteroarylcarbonyl or  which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl, C3-C20heteroarylcarbonyl or  is unsubstituted or substituted by one or more halogen, COOR3, (CO)R1a,  OR3, SR4, NR5R6, C1-C20alkyl, C2-C20alkyl which is interrupted by one or more O, C2-C12alkenyl, C3-C20cycloalkyl or phenyl;or Ar1 is Ar2 is phenylene, naphthylene,  which phenylene, naphthylene,  is unsubstituted or substituted by one or more halogen, COOR3, (CO)R1a,  OR3, SR4, NR5R6, C1-C20alkyl, C2-C12alkenyl, C3-C20cycloalkyl, phenyl or C2-C20alkyl which is interrupted by one or more O;Y is a direct bond, O, S, NR5 or CO;Z1 is O, S, CO or CR16(R17);Z2 is a direct bond, O, S or NR5; andQ is CO or a direct bond. 3. Compounds of the formula (I) according to claim 1, wherein X is A is O, S or NR5;R1 is C1-C20alkyl, C6-C20aryl or C1-C20alkoxy;R1a is C1-C20alkyl or C6-C20aryl;R3 is C1-C20alkyl or R3 together with one of the carbon atoms of R2 forms a 5- or 6-membered, preferably 6-membered, saturated ring;R4 is C6-C20aryl;R5 and R6 independently of each other are O(CO)R1a, (CO)R1a or C1-C20alkyl;R7, R8, R9, R10 and R11 independently of each other are hydrogen, C1-C20alkyl, halogen, NO2, OR3, (CO)R1a or C6-C20aryl;or R8 and R9 are R12, R13, R14 and R15 are hydrogen or C1-C4alkyl, preferably hydrogen;R16 and R17 are hydrogen;or R16 and R17 together with the carbon atom to which they are attached form a 5- or 6-membered saturated ring;Ar1 is C6-C20aryl or Ar2 is Y is a direct bond;Z1 is O, S or CR16(R17); andZ2 is O or S. 4. A photopolymerizable composition comprising (a) at least one ethylenically unsaturated photopolymerizable compound and(b) as photoinitiator, at least one compound of the formula I as defined in claim 1. 5. A photopolymerizable composition according to claim 4, wherein the component (a) is a resin obtained by the reaction of a saturated or unsaturated polybasic acid anhydride with a product of the reaction of an epoxy resin and an unsaturated monocarboxylic acid. 6. A photopolymerizable composition according to claim 4, further comprising at least one photoinitiator (c) and other additives (d). 7. A photopolymerizable composition according to claim 6 wherein the additive (d) is selected from a pigment, or a mixture of pigments, or a dye, or a mixture of dyes, or a mixture of one or more pigments with one or more dyes. 8. A photopolymerizable composition according to claim 6 wherein the additive (d) is a dispersant or a mixture of dispersants. 9. A photopolymerizable composition according to claim 6, further comprising a binder polymer (e). 10. The photopolymerizable composition according to claim 9, wherein the binder is a-copolymer of methacrylate and methacrylic acid. 11. A photopolymerizable composition according to claim 4, comprising 0.05 to 25% by weight of the photoinitiator (b), based on the composition. 12. A photopolymerizable composition according to claim 4, further comprising a photosensitizer selected from the group consisting of benzophenone, benzophenone derivatives, thioxanthone, thioxanthone derivatives, anthraquinone, anthraquinone derivatives, coumarin and coumarine derivatives. 13. A process for the photopolymerization of compounds containing ethylenically unsaturated double bonds, the process comprising irradiating a composition according to claim 4 with electromagnetic radiation in the range from 150 to 600 nm, or with an electron beam or with X-rays. 14. A process according to claim 13 for producing pigmented and non-pigmented paints, varnishes, powder coatings, printing inks, printing plates, adhesives, dental compositions, gel coats, photoresists for electronics, for encapsulating electrical and electronic components, for producing magnetic recording materials, micromechanical parts, waveguides, optical switches, plating masks, etch masks, colour proofing systems, glass fibre cable coatings, screen printing stencils, for producing three-dimensional objects, image recording materials, microelectronic circuits, decolorizing materials, bank/pixel definition layers for OLED, sealants for LCD and OLED, insulation/passivation layers for LCD and OLED, insulation for metal wiring/transparent conductive films for touch panel, coatings for touch panel, decorative inks for touch panel, protective films for touch panel or etching resists for touch panel. 15. A substrate coated on at least one surface with a composition according to claim 4. 16. A process for the photographic production of relief images comprising providing the coated substrate according to claim 15, subjecting the substrate to imagewise exposure, and removing unexposed portions with a developer. 17. Compounds of formula (IA) wherein X is R2 is C1-C20alkyl which is substituted by C3-C8cycloalkyl;Ar1 is C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl, C3-C20heteroarylcarbonyl or  which C6-C20aryl, C3-C20heteroaryl, C6-C20aroyl, C3-C20heteroarylcarbonyl or  is unsubstituted or substituted by one or more substituents selected from the group consisting of halogen, CN, NO2, COOR3, (CO)R1a, (CO)NR5R6, PO(OR1a)2, S(O)mR1a,  OR3, SR4, NR5R6, wherein the substituents OR3, SR4 or NR5R6 optionally form 5- or 6-membered rings via the radicals R3, R4, R5 or R6 with further substituents on the phenyl ring, C1-C20alkyl which is unsubstituted or substituted by one or more halogen, COOR3, CONR5R6, phenyl, C3-C8cycloalkyl, C3-C20heteroaryl, OR3, SR4 or NR5R6, C2-C20alkyl which is interrupted by one or more O, S or NR5, C2-C12alkenyl or C3-C20cycloalkyl, which C2-C12alkenyl or C3-C20cycloalkyl is uninterrupted or interrupted by one or more O, S, CO, NR5 or COOR3, phenyl, naphthyl, benzoyl and naphthoyl, which phenyl, naphthyl, benzoyl or naphthoyl is unsubstituted or substituted by OR3, SR4 or NR5R6;or Ar1 is. 18. A color filter comprising red, green and blue picture elements and optionally a black matrix, each of the elements including a photosensitive resin and a pigment on a transparent substrate, and a transparent electrode either on the surface of the substrate or on the surface of the picture elements, wherein said photosensitive resin comprises a polyfunctional acrylate monomer, an organic polymer binder and a photopolymerization initiator of formula I or II as defined in claim 1. 19. A process for the preparation of a compound of the formula I as defined in claim 1 by reacting the corresponding oxime compound of the formula (1A) wherein X, Ar1, and R2 are as defined in claim 1,with an acyl halide of the formula III or an anhydride of the formula IV wherein Hal is a halogen, in particular Cl, and R14 is as defined in claim 17, in the presence of a base or a mixture of bases.