Claims
- 1. An ultraviolet radiation curable fluorinated organosiloxane composition, consisting essentially of:
- A) an alkenyl-substituted fluorinated polyorganosiloxane containing an average of at least two alkenyl groups per molecule and having the general formula ##STR7## B) a mercaptoalkyl-substituted fluorinated polyorganosiloxane containing an average of at least two mercapto groups per molecule and having the general formula ##STR8## and C) a photoinitiator in an amount sufficient to promote curing of the composition in the presence of ultraviolet radiation;
- where Q is represented by the general formula ##STR9## and where R.sup.1 is an alkyl group, R.sup.2 is a fluorinated hydrocarbon group, R.sup.3 is an alkenyl group, R.sup.4 is selected from the group consisting of R.sup.1 and R.sup.3, R.sup.5 is a mercaptoalkyl group, R.sup.6 is selected from the group consisting of R.sup.1 and R.sup.5, a is number .gtoreq.0, b is a number .gtoreq.3, c is a number .gtoreq.0, d is a number .gtoreq.0, x is a number .gtoreq.0, y is a number .gtoreq.3, z is a number .gtoreq.0, e is a number .gtoreq.0, f is a number .gtoreq.0, g is a number .gtoreq.0, and the sum of the average number of alkenyl groups in component A and the average number of mercapto groups in component B is greater than 4.
- 2. The composition according to claim 1, wherein a, b, c, d, e, f, g, x, y, and z are selected such that said composition yields, upon exposure to ultraviolet radiation, a fluorosilicone gel having a penetration value ranging from 2 to 20 millimeters.
- 3. The composition according to claim 1, wherein d has a value of zero.
- 4. The composition according to claim 1, wherein R.sup.1 is an alkyl group containing from 1 to 4 carbon atoms.
- 5. The composition according to claim 4, wherein R.sup.1 is a methyl group.
- 6. The composition according to claim 1, wherein R.sup.2 has the general formula RfCH.sub.2 CH.sub.2 where Rf is a monovalent perfluorinated hydrocarbon radical containing from 1 to about 10 carbon atoms.
- 7. The composition according to claim 1, wherein R.sup.2 is 3,3,3-trifluoropropyl.
- 8. The composition according to claim 1, wherein R.sup.3 is selected from the group consisting of vinyl, allyl and 5-hexynl.
- 9. The composition according to claim 8, wherein R.sup.3 is a vinyl.
- 10. The composition according to claim 1, wherein R.sup.4 is selected from the group consisting of vinyl, allyl, and 5-hexynl.
- 11. The composition according to claim 10, wherein R.sup.4 is a vinyl group.
- 12. The composition according to claim 1, wherein R.sup.6 is a methyl group.
- 13. The composition according to claim 1, wherein c has a value of zero.
- 14. The composition according to claim 1, wherein the photoinitiator is selected from the group consisting of 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2,2-diethoxyacetophenone, and 3-hydroxypropyl phenyl ketone.
- 15. The composition according to claim 1, wherein the photoinitiator is 2-hydroxy-2-methyl-1-phenylpropan-1-one.
- 16. The composition according to claim 1, wherein c has a value of zero, d has a value of zero, a, b, e, f, g, x, y, and z are selected such that said composition yields, upon exposure to ultraviolet radiation, a fluorosilicone gel having a penetration value ranging from 2 to 20 millimeters, R.sup.1 is a methyl group, R.sup.2 is a 3,3,3-trifluoropropyl group, R.sup.4 is a vinyl group, R.sup.6 is a methyl group, and the photoinitiator is 2-hydroxy-2-methyl-1-phenylpropan-1-one.
- 17. The composition according to claim 1, further comprising a viscosity stabilizer.
Parent Case Info
This application is a continuation of application Ser. No. 08/616,014 filed Mar. 14, 1996, which application is now abandoned.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
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Parent |
616014 |
Mar 1996 |
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