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US 5,744,507 AGranted
Foamable organosiloxane compositions curable to silicone foams having improved adhesion
AssigneeDow Corning Corporation
InventorsGloria Lynne Angell, Michael Andrew Lutz
Life of this patent
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Abstract
A foamable, curable organosiloxane composition comprising an alkenyl-functional polyorganosiloxane, an organohydrogensiloxane, a blowing agent, a platinum catalyst and an adhesion promoter comprising an epoxy-functional compound, a hydroxyl-functional compound, a tetraalkylorthosilicate, an organotitanate and an aluminum or zirconium compound.
Claims17
A foamable, curable organosiloxane composition which yields, upon cure, a silicone foam having improved adhesion to a substrate, said foamable, curable composition comprising:
- (A) 100 parts by weight of a polyorganosiloxane containing an average of at least two alkenyl radicals per molecule and having a viscosity within a range of about 0.03 Pa.multidot.s to 500 Pa.multidot.s at 25.degree. C.;
- (B) an organohydrogensiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule;
- (C) a blowing agent;
- (D) a catalytically effective amount of a platinum group metal catalyst;
- and
- (E) an adhesion promoter comprising:
- i) an epoxy-functional compound;
- ii) a hydroxyl-functional compound comprising at least one hydroxy group and in the same molecule at least one alkenyl group;
- iii) a a tetraalkylorthosilicate;
- iv) an organotitanate;
- and
- v) a compound selected from a group consisting of compounds of aluminum and compounds of zirconium;
- wherein the sum of the average number of silicon-bonded hydrogen atoms per molecule of component (B) and the average number of silicon-bonded alkenyl groups per molecule in component (A) is greater than 4.
10 more elements
The product obtained from the incipient materials:
- (A) 100 parts by weight of a polyorganosiloxane containing an average of at least two alkenyl radicals per molecule and having a viscosity within a range of about 0.03 Pa.multidot.s to 100 Pa.multidot.s at 25.degree. C.;
- (B) an organohydrogensiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule;
- (C) a blowing agent;
- (D) a catalytically effective amount of a platinum group metal catalyst;
- and
- (E) an adhesion promoter comprising:
- i) 0.01 to 10 parts by weight, per 100 parts by weight of Component (A), of an epoxy-functional compound;
- ii) 0.01 to 5 parts by weight, per 100 parts by weight of Component (A), of a hydroxyl-functional compound comprising at least one hydroxy group and in the same molecule at least one alkenyl group;
- iii) 0.1 to 5 parts by weight, per 100 parts by weight of Component (A), of a tetraalkylorthosilicate;
- iv) 0.01 to 1 parts by weight, per 100 parts of component (A), of a organotitanate;
- and
- v) 0.0005 to 1 part by weight of a catalyst selected from a group consisting of compounds of aluminum and compounds of zirconium;
- wherein the sum of the average number of silicon-bonded hydrogen atoms per molecule of component (B) and the average number of silicon-bonded alkenyl groups per molecule in component (A) is greater than 4.
10 more elements
Dependencies are inferred from the claim text.