Additive system to improve adhesion and hydrolytic stability of silicone elastomers
First Claim
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1. An adhesion promoting composition for improving the adhesion performance of silicone elastomers at high humidity comprising:
- (a) an epoxy functional silane; and
(b) an acid chosen from the group of organic acids.
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Abstract
An adhesion promoting method and a corresponding composition for improving the performance of silicone elastomers at high humidity are disclosed. The improved adhesion promoter comprises: (a) an epoxy functional silane; and (b) an acid. The acid may be phosphoric acid or any organic acid. Acetic and citric acids are preferred. The inclusion of the epoxy functional silane and acid in a standard silicone elastomer system provides greatly enhanced stability and adhesion under conditions of high humidity.
13 Citations
23 Claims
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1. An adhesion promoting composition for improving the adhesion performance of silicone elastomers at high humidity comprising:
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(a) an epoxy functional silane; and (b) an acid chosen from the group of organic acids. - View Dependent Claims (19, 20)
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2. An addition-cure silicone elastomer composition comprising:
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(a) an addition curable polysiloxane resin; (b) a curing agent for said addition curable resin; and (c) an adhesion promoter comprising (i) an epoxy functional silane and (ii) an acid chosen from the group of organic acids and phosphoric acid. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 21, 22, 23)
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10. An improved addition-cure silicone elastomer composition of the type containing an addition curable polysiloxane resin;
- a curing agent for the addition curable resin; and
an adhesion promoter, wherein the improvement comprises;using as the adhesion promoter a composition comprising an epoxy functional silane and 1 part by weight of an acid chosen from the group of organic acids and phosphoric acid per 1 to 10 parts by weight of the epoxy functional silane. - View Dependent Claims (11, 12, 13)
- a curing agent for the addition curable resin; and
- 14. A method for improving the performance of an epoxy functional silane adhesion promoter under high humidity comprising adding to said epoxy functional silane adhesion promoter an amount of an organic acid sufficient to increase adhesion of a polysiloxane silicone elastomer incorporating said epoxy functional silane adhesion promoter following exposure to high humidity.
Specification