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US 6,602,551 B2Granted
Curable silicone adhesive compositions
AssigneeGeneral Electric Company
InventorsRachid Kerboua, Judith Stein
Life of this patent
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Abstract
A silicone composition is provided which comprises a vulcanizable adhesive formulation which comprises at least one oxygen-substituted allyl aromatic compound, a vinyl-containing polydiorganosiloxane, a hydrogen-containing polysiloxane, and a catalytic amount of a hydrosilylation catalyst. Further embodiments of the present invention include the oxygen-substituted allyl aromatic compound which provides adhesion to a substrate when present in a silicone composition and a method to provide cohesive failure to a silicone composition and a polyamide substrate.
Claims28
A silicone composition comprising a vulcanizable adhesive formulation which comprises:
- (A) at least one oxygen-substituted allyl aromatic compound having the structural formula I
- where R1 is hydrogen or an epoxy functional group;
- R2 is hydrogen or group II with the proviso that R1 is an epoxy functional group when R2 is hydrogen, said group II having the structural formula
- wherein R3 is hydrogen or an epoxy functional group;
- and W is a group having the structural formula R6—C—R7, wherein R6 and R7 are independently hydrogen, a perfluoroalkyl, a C1-C20 alkyl radical, a C4-C20 cycloalkyl radical or a C4-C20 aryl radical or taken together, R6 and R7 form a C4-C20 cycloaliphatic ring optionally substituted by one or more C1-C20 alkyl radicals, C6-C20 aryl radicals, C5-C21 aralkyl radicals, C5-C20 cycloalkyl groups or combinations thereof;
- (B) a vinyl-containing polydiorganosiloxane;
- (C) a hydrogen-containing polysiloxane;
- (D) a catalytic amount of a hydrosilylation catalyst;
- and
- (E) an inhibitor.
7 more elements
A silicone composition comprising a vulcanizable adhesive formulation which composition comprises
- (A) at least one oxygen-substituted allyl aromatic compound, present in a range of between about 0.1% by weight and about 5% by weight of the total composition, said compound having the structural formula I
- where R1 is hydrogen or an epoxy functional group;
- R2 is hydrogen or group II with the proviso that R1 is an epoxy functional group when R2 is hydrogen, said group II having the structural formula
- wherein R3 is hydrogen or an epoxy functional group;
- and W is a group having the structural formula R6—C—R7, wherein R6 and R7 are independently hydrogen, a perfluoroalkyl, a C1-C20 alkyl radical, a C4-C20 cycloalkyl radical or a C4-C20 aryl radical or taken together, R6 and R7 form a C4-C20 cycloaliphatic ring optionally substituted by one or more C1-C20 alkyl radicals, C6-C20 aryl radicals, C5-C21 aralkyl radicals, C5-C20 cycloalkyl groups or combinations thereof;
- (B) a vinyl-containing polydiorganosiloxane present in a range of between about 10% by weight and about 80% by weight of the total composition;
- (C) a hydrogen-containing polydiorganosiloxane present in a range of between about 1% by weight and about 15% by weight of the total composition;
- (D) a catalytic amount of a hydrosilylation catalyst;
- (E) an inhibitor present in a range of between about 0.01% by weight and about 1% by weight of the total composition;
- (F) a reinforcing filler present in a range of between 0% by weight and about 50% by weight of the total composition;
- and
- (G) an extending filler present in a range of between 0% by weight and about 70% by weight of the total composition.
9 more elements
A method to provide cohesive failure to a silicone composition and a substrate which comprises the steps of:
- (I) applying a silicone composition to a substrate wherein the silicone composition comprises
- (A) at least one oxygen-substituted allyl aromatic compound having the structural formula I
- where R1 is hydrogen or an epoxy functional group;
- R2 is hydrogen or Group II with the proviso that R1 is an epoxy functional group when R2 is hydrogen, said Group II having the structural formula
- wherein R3 is hydrogen or an epoxy functional group;
- and W is a group having the structural formula R6—C—R7, wherein R6 and R7 are independently hydrogen, a perfluoroalkyl, a C1-C20 alkyl radical, a C4-C20 cycloalkyl radical or a C4-C20 aryl radical or taken together, R6 and R7 form a C4-C20 cycloaliphatic ring optionally substituted by one or more C1-C20 alkyl radicals, C6-C20 aryl radicals, C5-C21 aralkyl radicals, C5-C20 cycloalkyl groups or combinations thereof;
- (B) a vinyl-containing polydiorganosiloxane;
- (C) a hydrogen-containing polysiloxane;
- (D) a catalytic amount of a hydrosilylation catalyst;
- and
- (E) an inhibitor;
- and
- (II) curing the silicone composition.
10 more elements
A method to provide cohesive failure to a silicone composition and a polyamide substrate which comprises the steps of:
- (1) applying a silicone composition to a substrate to a thickness in a range between about 1 millimeter and about 20 millimeters, wherein the silicone composition comprises:
- (A) an oxygen-substituted allyl aromatic compound present in a range between about 0.1% by weight and about 5% by weight of the total composition;
- (B) a vinyl-containing polydiorganosiloxane present in a range between about 10% by weight and about 80% by weight of the total composition,
- (C) a hydrogen-containing polysiloxane in a range between about 1% by weight and about 15% by weight of the total composition,
- (D) a catalytic amount of a hydrosilylation catalyst,
- (E) an inhibitor in a range between about 0.01% by weight and about 1% by weight of the total composition,
- (F) an extending filler in a range between about 0% by weight and about 50% by weight of the total composition,
- (G) a reinforcing filler in a range between about 0% by weight and about 70% by weight of the total composition, and
- (2) curing the silicone composition at a temperature in a range between about 50° C. and about 150° C. over a period in a range between about 0.25 hours and about 150 hours.
6 more elements
Dependencies are inferred from the claim text.