Compounds of the formula I in which Ar is a group or unsubstituted or substituted cyclopentyl, cyclohexyl, naphthyl, biphenylyl or an O-, S-or N-containing 5-or 6-membered heterocyclic ring; R1 and R2 are C1-C 20alkyl, OR11, CF3 or halogen; R3, R4 and R5 are hydrogen, C1-C20alkyl, OR 11 or ha
Compounds of the formula I in which Ar is a group or unsubstituted or substituted cyclopentyl, cyclohexyl, naphthyl, biphenylyl or an O-, S-or N-containing 5-or 6-membered heterocyclic ring; R1 and R2 are C1-C 20alkyl, OR11, CF3 or halogen; R3, R4 and R5 are hydrogen, C1-C20alkyl, OR 11 or halogen; R6 is unsubstituted or substituted C 1-C24alkyl, C2-C24alkyl, which is interrupted by O, S or NR14 and is unsubstituted or substituted; C2-C24alkenyl, uninterrupted or interrupted by O, S or NR14 and unsubstituted or substituted; unsubstituted or substituted C7-C24arylalkyl; C4-C24 cycloalkyl, uninterrupted or interrupted by O, S and/or NR14; or C8-C24arylcycloalkyl; R11 is C1-C 20alkyl, C3-C8cycloalkyl, phenyl, benzyl or C 2-C20alkyl, interrupted by O or S and unsubstituted or substituted; R12 and R13 are hydrogen, C1-C 20alkyl, C3-C8cycloalkyl, phenyl, benzyl or C 2-C20alkyl, interrupted by O atoms and unsubstituted or substituted; or R12 and R13 together are C3-C5alkylene, uninterrupted or interrupted by O, S or NR14 ; R14 is hydrogen, phenyl, C1-C12alkyl or C 2-C12alkyl, interrupted by O or S and unsubstituted or substituted; and M is hydrogen, Li, Na or K; are valuable intermediates for the preparation of unsymmetrical bisacylphosphine oxides and monoacylphosphine oxides.
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What is claimed is: 1. A compound of the formula I1 in which Ar is O; x is 0 or 1; Ar is a group or Ar is cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl or an O-, S-or N-containing 5-or 6-membered heterocyclic ring, where the radicals cyclopentyl, cyclohexyl, naphthyl, anthracyl, bip
What is claimed is: 1. A compound of the formula I1 in which Ar is O; x is 0 or 1; Ar is a group or Ar is cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl or an O-, S-or N-containing 5-or 6-membered heterocyclic ring, where the radicals cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl and 5-or 6-membered heterocyclic ring are unsubstituted or substituted by halogen, C1-C4alkyl and/or C1-C4alkoxy; R1 and R2 independently of one another are C1-C20 alkyl, or OR11, or; R3, R4 and R5 independently of one another are hydrogen, C1-C20 alkyl, or OR11; or in each case two of the radicals R1, R2, R3, R4 and R5 together form C1-C20 alkylene, which can be interrupted by O, S or NR14; R6 is C1-C24alkyl, unsubstituted or substituted by cycloalkenyl, phenyl, CN, C(O)R11, C(O)OR 11, C(O)N(R14)2, OC(O)R11, OC(O)OR 11, N(R14)C(O)N(R14), OC(O)NR14, N(R 14)C(O)OR11, cycloalkyl, halogen, OR11, SR 11, N(R12)(R13) or C2-C24alkyl which is interrupted once or more than once by nonconsecutive O, S or NR14 and which is unsubstituted or substituted by phenyl, OR11, SR11, N(R12)(R13), CN, C(O)R11, C(O)OR11, C(O)N(R14)2 and/or C2-C24alkenyl which is uninterrupted or interrupted once or more than once by nonconsecutive O, S or NR14 and which is unsubstituted or substituted by OR11, SR11 or N(R12)(R13); C5-C24cycloalkenyl which is uninterrupted or interrupted once or more than once by nonconsecutive O, S or NR14 and which is unsubstituted or substituted by OR11, SR11 or N(R12)(R13); C7-C24arylalkyl which is unsubstituted or substituted on the aryl group by C1-C12alkyl, C 1-C12alkoxy or halogen; C4-C24cycloalkyl which is uninterrupted or interrupted once or more than once by O, S and/or NR14 and which is unsubstituted or substituted by OR11, SR11 or N(R 12)(R13); or C8-C24arylcycloalkyl or C 8-C24arylcycloalkenyl; R11, is H, C1-C20alkyl, C2-C20alkenyl, C3-C8cycloalkyl, phenyl, benzyl or C2-C20alkyl, which is interrupted once or more than once by O or S and which is unsubstituted or is substituted by OH and/or SH; R12 and R13 independently of one another are hydrogen, C1-C20alkyl, C3-C8 cycloalky, phenyl, benzyl or C2-C20alkyl which is interrupted once or more than once by nonconsecutive O atoms and which is unsubstituted or substituted by OH and/or SH; or R12 and R13 together are C3-C5alkylene which is uninterrupted or interrupted by O, S or NR14; Y1 is C1-C18alkyl which is unsubstituted or substituted by one or more phenyl; C1-C 18-halogenoalkyl; C2-C18alkyl which is interrupted once or more than once by O or S and which can be substituted by OH and/or SH; unsubstituted C3-C18cycloalkyl or C3-C18cycloalkyl substituted by C1-C20alkyl, OR11, CF3 or halogen; C2-C18alkenyl; or Y1 is OR11, N(R12)(R13) or one of the radicals or Y1 is cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl or an O-, S-or N-containing 5-or 6-membered heterocyclic ring, where the radicals cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl and 5-or 6-membered heterocyclic ring are unsubstituted or substituted by halogen, C1-C4alkyl and/or C1-C4alkoxy; Y2 is a direct bond; unsubstituted or phenyl-substituted C1-C18alkylene; unsubstituted C4-C18-cycloalkylene or C4-C18cycloalkylene substituted by C1-C12alkyl, OR11, halogen and/or phenyl; unsubstituted C5-C18cycloalkenylene or C5-C18cycloalkenylene substituted by C1-C 12alkyl, OR11, halogen and/or phenyl; unsubstituted phenylene or phenylene substituted one to four times by C1-C 12alkyl, OR11, halogen,--(CO)OR14,--(CO)N(R 12)(R13) and/or phenyl; or Y2 is a radical or where these radicals are unsubstituted or are substituted one to four times on one or both aromatic ring(s) by C1-C 12alkyl, OR11, halogen and/or phenyl; Y3 is O, S, SO, SO2, CH2, C(CH 3)2, CHCH3, C(CF3)2, CO or a direct bond; R14 is hydrogen, phenyl, C1-C12 alkyl or C2-C12alkyl which is interrupted once or more than once by O or S and which can be substituted by OH and/or SH; R1' and R2' independently of one another have the same meanings as given for R1 and R2; and R3', R4' and R5' independently of one another have the same meanings as given for R3, R4 and R5; or in each case two of the radicals R1', R2 ', R3', R4' and R5' together form C1-C20alkylene which may be interrupted by O, S or--NR14; with the proviso that Y1 is not identical to Ar; and wherein the compounds n-butyl-(2,6-dimethoxybenzoyl)-(2,4,6-trimethylbenzoyl) phosphine oxide, i-butyl-(2,6-dimethoxybenzoyl)-(2,4,6-trimethylbenzoyl) phosphine oxide and (2,6-dimethoxybenzoyl)-(2, 6dimethylbenzoyl)-(2,4,4-trimethylpentyl) phosphine oxide are excluded. 2. A compound of the formula II in which Ar is is a group; R1 and R2 independently of one another are C1-C8 alkyl or OR11; R3, R4, and R5 independently of one another are hydrogen of C1-C8 alkyl; R6 is C1-C12 alkyl; R11 is H or C1-C8 alkyl; R12 and R13 independently of one another are hydrogen or C1-C8 alkyl; A is O; x is 1; Y1 is OR11, N(R12)(R13) or a radical R1' and R2' independently of one another have the same meanings given for R1 and R2; and R3', R4' and R5' independently of one another have the same meanings as given for R3, R4 and R5; with the proviso that Y1 is not identical to Ar. 3. The process for the preparation of compounds of the formula II in which A is O or S; x is 0 or 1; Ar is a group or Ar is cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl or an O-, S-or N-containing 5-or 6-membered heterocyclic ring, where the radicals cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl and 5-or 6-membered heterocyclic ring are unsubstituted or substituted by halogen, C1-C4alkyl and/or C1-C4alkoxy; R1 and R2 independently of one another are C1-C20alkyl, OR11, CF3 or halogen; R3, R4 and R5 independently of one another are hydrogen, C1-C20alkyl, OR11 or halogen; or in each case two of the radicals R1, R2, R3, R4 and R5 together form C1-C 20alkylene which can be interrupted by O, S or--NR14; R6 is C1-C24alkyl, unsubstituted or substituted by C5-C24cycloalkenyl, phenyl, CN, C(O) R11, C(O)OR11, C(O)N(R14)2, OC(O)R 11, OC(O)OR11, N(R14)C(O)N(R14), OC(O) NR14, N(R14)C(O)OR11, cycloalkyl, halogen, OR11, SR11, N(R12)(R13) or C2-C24alkyl which is interrupted once or more than once by nonconsecutive O, S or NR14 and which is unsubstituted or substituted by phenyl, OR11, SR11, N(R12)(R13), CN, C(O)R11, C(O)OR11, C(O)N(R14)2 and/or C2-C24alkenyl which is uninterrupted or interrupted once or more than once by nonconsecutive O, S or NR14 and which is unsubstituted or substituted by OR11, SR11 or N(R12)(R13); C5-C24cycloalkenyl which is uninterrupted or interrupted once or more than once by nonconsecutive O, S or NR14 and which is unsubstituted or substituted by OR11, SR11 or N(R12)(R13); C7-C24arylalkyl which is unsubstituted or substituted on the aryl group by C1-C12alkyl, C 1-C12alkoxy or halogen; C4-C24cycloalkyl which is uninterrupted or interrupted once or more than once by O, S and/or NR14 and which is unsubstituted or substituted by OR11, SR11 or N(R 12)(R13); or C8-C24arylcycloalkyl or C8-C 24arylcycloalkenyl; R11 is H, C1-C20alkyl, C2-C20alkenyl, C3-C8cycloalkyl, phenyl, benzyl or C2-C20alkyl which is interrupted once or more than once by nonconsecutive O atoms and which is unsubstituted or substituted by OH and/or SH; R12 and R13 independently of one another are hydrogen, C1-C20alkyl, C3-C8 cycloalkyl, phenyl, benzyl or C2-C20alkyl, which is interrupted once or more than once by O or S and which is unsubstituted or substituted by OH and/or SH; or R12 and R13 together are C3-C5alkylene which is uninterrupted or interrupted by O, S or NR14; Y1 is C1-C18 alkyl which is unsubstituted or substituted by one or more phenyl; C1-C18 -halogenoalkyl C2-C18 alkyl which is interrupted once or more than once by O or S and which can be substituted by OH and/or SH; unsubstituted C3-C18 cycloalkyl substituted by C1-C20 alkyl, OR11, CF3 or halogen; C2-C18alkenyl; or Y1 is OR11, N(R 12)(R13)or one of the radicals or Y1 is cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenyl or an O--, S--or N-containing 5--or 6--membered heterocyclic ring, where the radicals cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl and 5--or 6-membered heterocyclic ring are unsubstituted or substituted by halogen, C1-C4 alkyl and/or, C1-C4 alkoxy; Y2 is a direct bond; unsubstituted or phenyl-substituted C1-C18 l alkylene; unsubstituted C4-C18-cycloalkylene or C4-C18 cycloalkylene substituted by C1-C12 alkyl, OR11, halogen and/or phenyl; unsubstituted C5-C18 cycloalkenylene or C5-C18 cycloalkenylene substituted by C1-C 12 alkyl, OR11, halogen and/or phenyl; unsubstituted phenylene or phenylene substituted one to four times by C1-C 12 alkyl, OR11, halogen,--(CO)OR14,--(CO)N(R 12(R13) and/or phenyl; or Y2 is a radical where these radicals are unsubstituted or are substituted one to four times on one or both aromatic ring(s) by C1-C12 alkyl, OR11, halogen and/or phenyl; Y3 is O, S, SO, SO2, CH2, C(CH 3)2, CHCH3, C(CF3)2, CO or a direct bond; R14 is hydrogen, phenyl, C1-C12 alkyl or C2-C12 alkyl which is interrupted once or more than once by O or S and which can be substituted by OH and/or SH; R1' and R2' independently of one another have the same meanings as given for R1 and R2; and R3', R4' and R5' independently of one another have the same meanings as given for R3, R4 and R5; or in each case two of the radicals R1', R 2', R3', R4' and R5' together form C 1-C20 alkylene which may be interrupted by O, S or--NR 14; with the proviso that Y1 is not identical to Ar by (1) reaction of an acyl halide of the formula IV in which Ar is as defined as above, and X is Cl or Br; in which R6 is as defined as above; and M1 is Na, Li or K; in the molar ration or approximately 1:1; (2) subsequent reaction of the product with an acyl halide of the formula IVa in which Y1 is as defined as above; and X is as defined above; with the proviso that the acyl halide of the formula IV is not identical to the acyl halide of the formula IVa; in the molar ratio of approximately 1:1; and, (3) optionally, when compounds of the formula II, in which A is oxygen or sulfur are to be obtained, subsequent oxidation or sulfurization of the phosphine compounds. 4. A process for the preparation of compounds of the formula II in which A is oxygen and x is 1, by (1) reaction of a compound of the formula (I) in which Ar is a group or Ar is cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl or an O--, S--or N-containing 5-or 6-membered heterocyclic ring, where the radicals cyclopenyl, cyclohexyl, naphthyl, anthracyl, biphenylyl and 5-or 6-membered heterocyclic ring are unsubstituted or substituted by halogen, C1-C4 alkyl and/or C1-C4 alkoxy; R1 and R2 independently of one another are C1-C20 alkyl, OR11, CF3 or halogen; R3, R4 and R5 independently of one another are hydrogen, C1-C20 alkyl, OR11 or halogen; or in each case two of the radicals R1, R2, R3, R4 and R5 together form C1-C 20 alkylene, which can be interrupted by O, S or NR14; R6 is C1-C24 alkyl, unsubstituted or substituted by cycloalkenyl, phenyl, CN, C(O)R11, C(O)OR 11, C(O)N(R14)2, OC(O)R11, OC(O)OR 11, N(R14), OC(O)NR14, N(R14)C(O)OR 11, cycloalkyl, halogen, OR11, SR11, N(R12 )(R13) or C2-C24 alkyl which is interrupted once or more than once by nonconsecutive O, S, or NR14 and which is unsubstituted or substituted by phenyl, OR11, SR11, N(R12(R13), CN, C(O)R11, C(O)OR11, C(O)N(R14)2 and/or C2-C24 alkenyl which is uninterrupted or interrupted once or more than once by nonconsecutive O, S or NR14 and which is unsubstituted or substituted by OR11, SR 11, or N(R12)(R13); C5-C24 cycloalkenyl which is uninterrupted or interrupted once or more than once by non-consecutive O, S, or NR 14 and which is unsubstituted or substituted by OR11, SR 11 or N(R12(R13); C7-C24 arylalkyl which unsubstituted or substituted on the aryl group by C1-C12 alkyl, C 1-C12 alkoxy or halogen; C4-C24 cycloalkyl which is uniterrupted or interrupted once or more than once by O, S and/or NR14 and which is unsubstituted or substituted by OR11, SR11 or N(R 12)(R13); or C8-C24 arylcycloalkyl or C8-C24 arylcycloalkenyl; R11 is H, C1-C20 alkyl, C2-C20 alkenyl, C3-C8 cycloalkyl, phenyl, benzyl, or C2-C20 alkyl, which is interrupted once or more than once by O or S and which is unsubstituted or is substituted by OH and/or SH; R12 and R13 independently of one another are hydrogen, C1-C20 alkyl, C3-C8 cycloalkyl, phenyl, benzyl or C2-C20 alkyl which is interrupted once or more than once by nonconsecutive O atoms and which is unsubstituted or substituted by Oh and/or SH; or R12 and R13 together are C3-C5 alkylene which is uninterrupted or interrupted by O, S, or NR14; R14 is hydrogen, phenyl, C1-C12 alkyl or C2-C12 alkyl which is uniterrupted once or more than once by O or S and which is unsubstituted or substituted by OH and/or SH; and is hydrogen, Li, Na or K with phosgene to give the corresponding phosphine chloride (li) (2) subsequent reaction with an alcohol to give the compound of the formula (lii) in which R is the radical of an alcohol, in particular C1-C12 alkyl, C5-C6 cycloalkyl or benzyl; and (3) reaction of the resulting compound of the formula (lii) with an acyl halide in which Y1 is C1-C18 alkyl which is unsubstituted or substituted by one or more phenyl; C1-C18 halogenoalkyl; C2-C18 alkyl which is interrupted once or more than once by O or S and which can be substituted by OH and/or SH; unsubstituted C3-C19 cycloalkyl or C 3-C18 cycloalkyl substituted by C1-C20 alkyl, OR11, CF3 or halogen; C2-C18 alkenyl; or Y1 is OR11, N(R12)(R13) or one of the radicals or Y1 is cyclopentyl, cyclohexyl, napthyl, anthracyl, biphenylyl or an O--, S--or N-containing 5-or 6-membered heterocyclic ring, where the radicals cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl and 5-or 6-membered heterocyclic rings are unsubstituted or substituted by halogen, C1-C4alkyl and/or C1-C4alkoxy; Y2 is a direct bond; unsubstituted or phenyl-substituted C1-C18 alkylene; unsubstituted C4-C18-cycloalkylene or C4-C18 cycloalkylene substituted by C1-C12 alkyl, OR11, halogen and/or phenyl; unsubstituted C5-C18 cycloalkenylene or C5-C18 cycloalkenylene substituted by C1-C 12 alkyl, OR11, halogen, and/or phenyl; substituted phenylene or phenylene substituted one to four times by C1-C 12 alkylk, OR11, halogen,--(CO)OR14,--(CO)N(R 12(R13) and/or phenyl; or Y2 is a radical where these radicals are unsubstituted or are substituted one to four times on one or both aromatic ring(s) by C1-C12 alkyl, OR11, halogen and/or phenyl; Y3 is O, S, SO, SO2, CH2, C(CH 3)2, CHCH3, C(CF3)2, CO or a direct bond; R14 is hydrogen, phenyl, C1-C12 alkyl or C2-C12 alkyl which is interrupted once or more than once by O or S and which can be substituted by OH and/or SH; R1' and R2' independently of one another have the same meaning as given for R1 and R2; and R3', R4' and R5' independently of one another have the same meanings as given for R3, R4 R5; or in each case two of the radicals R1', R2 ', R3', R4' and R5' together form C1-C20 alkylene which may be interrupted by O, S, or--NR14 ; with the proviso that Y1 is not identical to Ar, and X is Cl or Br, to give the compound of the formula II. 5. A photocurable composition comprising (a) at least one ethylenically unsaturated photopolymerizable compound and (b) at least one compound of the formula II as photoinitiator. 6. A photocurable composition according to claim 5, comprising, in addition to components (a) and (b), further photoinitiators (c) and/or further additives (d). 7. A photocurable composition as claimed in claim 6, comprising, as further photoinitiator (c), at least one compound of the formula VIII, IX, X, XI R25 is hydrogen, C1-C18 alkyl, C1-C18 alkoxy,--OCH2CH2-OR29 , morpholino, SCH3, group or a group n has a value from 2 to 10; G1 and G2 independently of one another are end groups of the polymeric unit, in particular hydrogen or CH3; R26 is hydroxyl, C1-C16 alkoxy, morpholino, dimethylamino or--O(CH2CH2O)m--C1-C16 alkyl; R27 and R28 independently of one another are hydrogen, C1-C6 alkyl, phenyl, benzyl, C1-C16 alkoxy or--O(CH2CH2O)m--C 1-C16 alkyl, or R27 or R28 together with the carbon atom to which they are bonded form a cyclohexyl ring; m is a number from 1-20 where R26, R27 and R28 are not all C1-C16 alkoxy or--O(CH2CH2O) m--C1-C16 alkyl at the same time, and R28 is hydrogen, R30 and R32 independently of one another are hydrogen or methyl; R31 is hydrogen, methyl or phenylthio, where the phenyl ring of the phenylthio radical is unsubstituted or substituted by C1-C4 alkyl in the 4-, 2-, 2,4-or 2,4,6-position R33 and R34 independently of one another are C1-C20 alkyl, cyclohexyl, cyclopentyl, phenyl, naphthyl or biphenyl, where these radicals are unsubstituted or are substituted by halogen, C1-C12 alkyl and/or C1-C12 alkoxy, or R33 is an S-or N-containing 5-or 6-membered heterocyclic ring, or are R35 is cyclohexyl, cyclopentyl, phenyl, naphthyl or biphenyl, these radicals being unsubstituted or substituted by halogen, C1-C4 alkyl and/or C1-C4 alkoxy, or R35 is an S-or N-containing 5-or 6-membered heterocyclic ring; R36 and R37 independently of one another are unsubstituted cyclopentadienyl or cyclopentadienyl substituted once, twice or three times by C1-C18 alkyl, C1-C 18 alkoxy, cyclopentyl, cyclohexyl or halogen; and R38 and R39 independently of one another are phenyl which is substituted in at least one of the two ortho positions relative to the titanium-carbon bond by fluorine atoms or CF 3, and which on the aromatic ring may contain, as further substituents, unsubstituted pyrrolinyl or pyrrolinyl substituted by one or two C1-C12 alkyl, di)C1-C12 alkyl) aminomethyl, morpholinomethyl, C2-C4 alkenyl, methoxymethyl, ethoxymethyl, trimethylsilyl, formyl, methoxy or phenyl; or polyoxaalkyl, or R38 and R39 are R40, R41 and R42 independently of one another are hydrogen, halogen, C2-C12 alkenyl, C 1-C12 alkoxy, C2-C12 alkoxy interrupted by one to four O atoms, cyclohexyloxy, cyclopentyloxy, phenoxy, benxyloxy, unsubstituted phenyl or phenyl substituted by C1-C4 alkoxy, halogen, phenylthio or C1-C4-alkylthio; or biphenyl, where R40 and R42 are not both hydrogen at the same time and in the radical at least one radical R40 and R42 is C 1-C12 alkoxy, C2-C12 alkoxy interrupted by one to four O atoms, cyclohexyloxy, cyclopentyloxy, phenoxy or benzyloxy; E1 is O, S or NR43; and R43 is C1-C8 alkyl, phenyl or cyclohexyl. 8. A process for the photopolymerization of nonvolatile monomeric, oligomeric or polymeric compounds having at least one ethylenically unsaturated double bond, which comprises irradiating a composition according to claim 5 with light in the range from 200 to 600 nm. 9. A process according to claim 8 for the preparation of pigmented and nonpigmented surface coatings, printing inks, screen printing inks, offset printing inks, flexographic printing inks, powder coatings, printing plates, adhesives, dental materials, optical waveguides, optical switches, colour testing systems, composite materials, gel coats, glass-fibre cable coatings, screen printing stencils, resist materials, colour filters, for the encapsulation of electrical and electronic components, for the preparation of magnetic recording materials, of three-dimensional objects by means of stereolithography, of photographic reproductions, image recording material, for holographic recordings, for the preparation of decolouring materials, for the preparation of image recording materials using microcapsules. 10. A coated substrate which has been coated on at least one surface with a composition according to claim 5. 11. A process for the photographic production of relief images in which a coated substrate according to claim 10 is subjected to imagewise exposure and then the unexposed portions are removed with a solvent.
Leppard David George,CHX ; James Thomas Lloyd,CHX ; Hock Nils,DEX ; Kohler Manfred,DEX ; Salathe Ronald,CHX, Molecular complex compounds of acylphosphine oxide and .alpha.-hydroxy ketones as photoinitiators.
Henne Andreas (Ludwigshafen DEX) Hesse Anton (Luetzelsachsen DEX) Heil Guenter (Ludwigshafen DEX) Schornick Gunnar (Neuleiningen DEX), Photopolymerizable composition with acylphosphine sulfide photoinitiator and method.
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