Silicone composition and cured silicone product
AssigneeDow Corning Corporation
InventorBizhong Zhu
Life of this patent
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Abstract
A silicone resin composition, comprising (A) 100 parts by weight of an organopolysiloxane resin containing an average of greater than two alkenyl groups per molecule and having less than 1.5 mole % percent of silicon-bonded hydroxy groups, (B) an organohydrogensilane in an amount sufficient to cure the composition, (C) an effective amount of an inorganic filler; and (D) a catalytic amount of a hydrosilylation catalyst. The present invention is further directed to a cured silicone product comprising a reaction product of the above-described composition. A cured silicone product comprising a reaction product of the silicone resin composition and a multi-part silicone composition comprising components (A) through (D) in two or more parts, provided components (A), (B), and (D) are not present in the same part.
Claims20
A silicone resin composition, comprising:
- (A) 100 parts by weight of an organopolysiloxane resin containing an average of greater than two alkenyl groups per molecule and having less than 1.5 mol % of silicon-bonded hydroxy groups, wherein the resin is selected from:
- (a) a copolymer consisting essentially of R23SiO1/2 units and R1SiO3/2 units, wherein the mole ratio of R23SiO1/2 units to R1SiO3/2 is from 0.05 to 3.0,
- (b) a copolymer consisting essentially of R23SiO1/2 units, R1SiO3/2 units, and SiO4/2 units, wherein the mole ratio of R23SiO1/2 units to R1SiO3/2 is from 0.05 to 3.0 and the mole ratio of R23SiO1/2 and R1SiO3/2 units combined to SiO4/2 units is from 4 to 99,
- (c) a copolymer consisting essentially of R23SiO1/2 units, R1SiO3/2 units, and R22SiO2/2 units, wherein the mole ratio of R23SiO1/2 units to R1SiO3/2 units is from 0.05 to 3.0 and the mole ratio of R23SiO1/2 units and R1SiO3/2 units combined to R22SiO2/2 units is from 0.5 to 99;
- and
- (d) a copolymer consisting essentially of R22SiO2/2 units and R1SiO3/2 units, wherein the mole ratio of R22SiO2/2 units to R1SiO3/2 units is from 0.2 to 4.0;
- wherein R1 is a hydrocarbyl group free of aliphatic unsaturation and R2 is selected from R1 and alkenyl;
- (B) an organohydrogensilane in an amount sufficient to cure the composition, the organohydrogensilane having the formula:
- wherein R3 is a hydrocarbyl group free of aliphatic unsaturation and R4 is a hydrocarbylene group having a formula selected from:
- wherein x is from 1 to 6;
- (C) an effective amount of an inorganic filler;
- and
- (D) a catalytic amount of a hydrosilylation catalyst.
A multi-part silicone resin composition, comprising:
- (A) 100 parts by weight of an organopolysiloxane resin containing an average of greater than two alkenyl groups per molecule and having less than 1.5 mol % of silicon-bonded hydroxy groups, wherein the resin is selected from:
- (a) a copolymer consisting essentially of R23SiO1/2 units and R1SiO3/2 units, wherein the mole ratio of R23SiO1/2 units to R1SiO3/2 is from 0.05 to 3.0,
- (b) a copolymer consisting essentially of R23SiO1/2 units, R1SiO3/2 units, and SiO4/2 units, wherein the mole ratio of R23SiO1/2 units to R1SiO3/2 is from 0.05 to 3.0 and the mole ratio of R23SiO1/2 and R1SiO3/2 units combined to SiO4/2 units is from 4 to 99,
- (c) a copolymer consisting essentially of R23SiO1/2 units, R1SiO3/2 units, and R22SiO2/2 units, wherein the mole ratio of R23SiO1/2 units to R1SiO3/2 units is from 0.05 to 3.0 and the mole ratio of R23SiO1/2 units and R1SiO3/2 units combined to R22SiO2/2 units is from 0.5 to 99;
- and
- (d) a copolymer consisting essentially of R22SiO2/2 units and R1SiO3/2 units, wherein the mole ratio of R22SiO2/2 units to R1SiO3/2 units is from 0.2 to 4.0;
- wherein R1 is a hydrocarbyl group free of aliphatic unsaturation and R2 is selected from R1 and alkenyl;
- (B) an organohydrogensilane in an amount sufficient to cure the composition, the organohydrogensilane having the formula:
- wherein R3 is a hydrocarbyl group free of aliphatic unsaturation and R4 is a hydrocarbylene group having a formula selected from:
- wherein x is from 1 to 6;
- (C) an effective amount of an inorganic filler;
- and
- (D) a catalytic amount of a hydrosilylation catalyst;
- provided components (A), (B), and (D) are not present in the same part.
Dependencies are inferred from the claim text.