초록 ▼

Curable fluoroelastomers comprising monomeric units formed by a triazine iodinated derivative having general formula:wherein Y′ is independently H, Cl, F, CH 3 , or CF 3 , m′ and t′ are 0 or 1, and m′+t′=0 or 1, preferably m′+t′=0; p′ is an i

Curable fluoroelastomers comprising monomeric units formed by a triazine iodinated derivative having general formula:wherein Y′ is independently H, Cl, F, CH 3 , or CF 3 , m′ and t′ are 0 or 1, and m′+t′=0 or 1, preferably m′+t′=0; p′ is an integer and is equal to 1 when t′=1, or p′=0; X′ is independently H, Cl, F, alkyl or perfluoroalkyl C 1 -C 3 , preferably F; n′ is an integer between 2 and 20, preferably between 4 and 12, more preferably between 4 and 8.

대표청구항 ▼

1. Vinylidene fluoride (VDF)-based or tetrafluoroethylene (TFE)-based fluoroelastomers curable with peroxides and having terminal position iodine atoms derived by free-radical polymerization in the presence of iodinated triazine derivative of formula:whereinCY′ 2 , CX′ 2 , X′

1. Vinylidene fluoride (VDF)-based or tetrafluoroethylene (TFE)-based fluoroelastomers curable with peroxides and having terminal position iodine atoms derived by free-radical polymerization in the presence of iodinated triazine derivative of formula:whereinCY′ 2 , CX′ 2 , X′ 2 C and Y′ 2 C represent carbon atoms bound to two Y′ or X′ substituents;wherein Y′ is H, Cl, F, CH 3 , or CF 3 , and X′ is H, Cl, F, alkyl or C 1 -C 3 perfluoroalkyl;m′ and t′ are 0 or 1, and m′ plus t′ is 0 or 1;p′ is 0 or 1, and is equal to 1 when t′ is 1; andn′ is an integer in the range of 2-20,in the presence of a free radical initiator. 2. Fluoroelastomers according to claim 1, wherein the compounds of formula (I) are those in which m′=t′=p′=0; n′ is in the range 4-8; X′=F. 3. Fluoroelastomers according to claim 1, wherein the unit amount in the chain of the triazine iodinated derivatives is in the range 0.01-1.0 moles per 100 moles of the other monomeric units forming the polymer. 4. Fluoroelastomers according to claim 1, wherein a fluoroelastomer base structure is selected from the following classes of copolymers:(1) VDF-based copolymers, wherein VDF is copolymerized with at least a comonomer selected from the group consisting of: C 2 -C 8 perfluoroolefins; C 2 -C 3 chloro- and/or bromo- and/or iodo-fluoroolefins; CF 2 ═CFOR f perfluoro(alkyl vinyl ethers) (PAVE), wherein R f is a C 1 -C 6 perfluoroalkyl; CF 2 ═CFOX perfluoro(oxyalkyl vinyl ethers), wherein X is a C 1 -C 12 perfluorooxyalkyl having one or more ethereal groups; and C 2 -C 8 non-fluorinated olefins (Ol);(2) TFE-based copolymers, wherein TFE is copolymerized with at least a comonomer selected from the following:CF 2 ═CFOR f perfluoro(alkyl vinyl ethers) (PAVE), wherein R f is as above defined; CF 2 ═CFOX perfluoro(oxyalkyl vinyl ethers,) wherein X is as above defined; C 2 -C 8 fluoro-olefins containing hydrogen and/or chlorine and/or bromine and/or iodine atoms; C 2 -C 8 non-fluorinated olefins (Ol). 5. Fluoroelastomers according to claim 4, wherein the compositions of the monomers forming the basic structure of said fluoroelastomers are selected from the group consisting of:(a) VDF 45-85% by moles, hexafluoropropene (HFP) 15-45% by moles, TFE 0-30% by moles; (b) VDF 50-80% by moles, PAVE 5-50% by moles, TFE 0-20% by moles, (c) VDF 20-30% by moles, Ol 10-30% by moles, HFP e/o PAVE 18-27% by moles, TFE 10-30% by moles; (d) TFE 50-80% by moles; PAVE 20-50% by moles; (e) TFE 45-65% by moles, Ol 20-55% by moles, VDF 0-30% by moles; (f) TFE 32-60% by moles, Ol 10-40% by moles; PAVE 20-40% by moles; and (g) TFE 33-75% by moles; PAVE 15-45% by moles, VDF 5-30% by moles. 6. Fluoroelastomers according to claim 5, wherein the monomer compositions are selected from the group consisting of:(d) TFE 50-80% by moles, PAVE 20-50% by moles; and (g) TFE 33-75% by moles, PAVE 15-45% by moles, VDF 5-30% by moles. 7. Fluoroelastomers according to claim 4, wherein the fluoroelastomer base structure is selected from the copolymers of class (2). 8. Fluoroelastomers according to claim 4, formed from perfluorinated monomers. 9. Fluoroelastomers according to claim 1, comprising monomeric units derived from a bis-olefin having the formula:wherein:R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , equal to or different from each other, are H or C 1 -C 5 alkyls:Z is a C 1 -C 18 alkylene or cycloalkylene radical, linear or branched, optionally containing oxygen atoms, a partially fluorinated C 1 -C 18 alkylene or cycloalkylene radical, a perfluoropolyoxyalkylene or a fluoropolyoxyalkylene radical. 10. Fluoroelastomers according to clam 9 , wherein in formula (II), Z is a C 4 C 12 perfluoroalkylene radical, and R 1 , R 2 , R 3 , R 4 , R 5 , R 6 are hydrogen. 11. Fluoroelastomers according to claim 9, wherein Z is a perfluoropolyoxyalkylene or fluoropolyoxyalkylene radical, having the formula: p —CF 2 O—(CF 2 CF 2 O) m (CF 2 O) n —CF 2 —(Q) p —  (III)wherein: Q is an C 1 -C 10 alkylene or oxyalkylene radical;p is 0 or 1; m and n are integers such that the m/n ratio is in the range 0.2-5 and the molecular weight of said perfluoropolyoxyalkylene or fluoropolyoxyalkylene radical is in the range 500-10,000. 12. Fluoroelastomers according to claim 9, wherein the unit amount in the chain derived from such bis-olefins is in the range 0.01-1.0 moles per 100 moles of the other basic monomeric units. 13. Fluoroelastomers according to claim 3, wherein the unit amount in the chain of the triazine iodinated derivatives is in the range 0.03-0.5 moles per 100 moles of the other monomeric units forming the polymer.