Claims
- 1. An addition curable composition comprising a mixture of:
- (A) at least one polyorganosiloxane having alkenyl groups bonded to silicon;
- (B) at least one hydride polyorganosiloxane comprising at least one organosiloxane unit having an Si--H moiety;
- (C) as a catalyst, at least one platinum group metal compound in an amount effective to cause hydrosilylation of reagent A with reagent B; and
- (D) an adhesion promoting proportion of a silicon- and nitrogen-containing composition which is the reaction product of at least one aminoalkylsilane of the formula ##STR6## with at least one glycidoxyalkylsilane of the formula ##STR7## wherein each of R.sup.1 and R.sup.2 is independently C.sub.1-8 alkyl; each R.sup.3 is independently hydrogen or C.sub.1-4 primary or secondary alkyl; R.sup.4 is hydrogen, C.sub.1-4 primary or secondary alkyl or C.sub.6-10 aryl or alkaryl; each a is independently 1-3 and each of m and n is independently 2 or 3.
- 2. A composition according to claim 1 wherein the alkenyl groups are vinyl groups.
- 3. A composition according to claim 2 wherein reagents A and B are polymethylsiloxanes.
- 4. A composition according to claim 3 wherein the platinum group metal is platinum.
- 5. A composition according to claim 3 which is a one-part composition.
- 6. A composition according to claim 5 wherein reagent A comprises a polymethylsiloxane comprising M and D units and having vinyl groups attached to the terminal silicon atoms.
- 7. A composition according to claim 6 which also contains a reinforcing filler.
- 8. A composition according to claim 5 wherein reagent A comprises a polymethylsiloxane comprising M and D units and having vinyl groups attached to the terminal silicon atoms, in admixture with about 25-40% based on reagent A of a polymethylsiloxane comprising M and Q units in a ratio in the range of about 0.3-0.7:1.
- 9. A composition according to claim 3 which is a two-part composition.
- 10. A composition according to claim 3 wherein each R.sup.1 and each R.sup.2 is methyl.
- 11. A composition according to claim 10 wherein each R.sup.3 is hydrogen.
- 12. A composition according to claim 11 wherein each a is 3 and each of m and n is 3.
- 13. A composition according to claim 12 wherein R.sup.4 is hydrogen or methyl.
- 14. An article comprising a metal or plastic substrate having a coating of an addition curable composition comprising a mixture of:
- (A) at least one polyorganosiloxane having alkenyl groups bonded to silicon;
- (B) at least one hydride polyorganosiloxane comprising at least one organosiloxane unit having an Si--H moiety;
- (C) as a catalyst, at least one platinum group metal compound in an amount effective to cause hydrosilylation of reagent A with reagent B; and
- (D) an adhesion promoting proportion of a silicon- and nitrogen-containing composition which is the reaction product of at least one aminoalkylsilane of the formula ##STR8## with at least one glycidoxyalkylsilane of the formula ##STR9## wherein each of R.sup.1 and R.sup.2 is independently C.sub.1-8 alkyl; each R.sup.3 is independently hydrogen or C.sub.1-4 primary or secondary alkyl; R.sup.4 is hydrogen, C.sub.1-4 primary or secondary alkyl or C.sub.6-10 aryl or alkaryl; each a is independently 1-3 and each of m and n is independently 2 or 3.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 08/395,129 filed Feb. 27, 1995, abandoned.
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Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
395129 |
Feb 1995 |
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