Silicone pressure sensitive adhesive composition
First Claim
1. A method for providing a pressure sensitive adhesive composition, comprising condensing, at an elevated temperature in the presence of a base catalysts a silanol-functional silicone resin, said resin comprising M structural units according to the formula R13SiO1/2, wherein each R1 is independently hydroxy or a monovalent hydrocarbon radical, and Q structural units according to the formula SiO4/2 in a ratio of M units to Q units of less than 1.1:
- 1, a silanol-functional polydiorganosiloxane gum and a crosslinker selected from the group consisting of alkoxysilane and poly(alkoxysilane).
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Abstract
A silicone pressure sensitive adhesive composition containing the condensation product of a silanol-functional silicone resin, wherein the resin contains M structural units according to the formula R3SiO1/2, wherein R is a monovalent hydrocarbon radical, and Q structural units according to the formula SiO4/2 in a ratio of M units to Q units of less than 1.1:1, a silanol-functional polydiorganosiloxane gum, and a crosslinker exhibits high tack and high lap shear strength.
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Citations
11 Claims
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1. A method for providing a pressure sensitive adhesive composition, comprising condensing, at an elevated temperature in the presence of a base catalysts a silanol-functional silicone resin, said resin comprising M structural units according to the formula R13SiO1/2, wherein each R1 is independently hydroxy or a monovalent hydrocarbon radical, and Q structural units according to the formula SiO4/2 in a ratio of M units to Q units of less than 1.1:
- 1, a silanol-functional polydiorganosiloxane gum and a crosslinker selected from the group consisting of alkoxysilane and poly(alkoxysilane).
- View Dependent Claims (2)
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3. A method for providing a pressure sensitive adhesive composition, comprising condensing, at an elevated temperature in the presence of a base catalyst, a silanol-functional silicone resin, said resin comprising M structural units according to the formula R13SiO1/2, wherein each R1 is independently hydroxy or a monovalent hydrocarbon radical, and Q structural units according to the formula SiO4/2 in a ratio of M units to Q units of less than 1.1:
- 1;
a silanol-functional polydiorganosiloxane gum and a crosslinker comprising;(a) heating a mixture of the resin, gum, crosslinker, base catalyst and an organic solvent to a first elevated temperature to begin condensation of the resin, gum and crosslinker, (b) adding a molar excess, based on moles of alkoxy groups of the resin, gum and crosslinker of the mixture of step (a), of water to the mixture of step (a), (c) heating the mixture of step (b), to allow hydrolysis of any remaining alkoxy groups, and (d) heating the mixture of step (c) to a second elevated temperature from about 110 to 130°
C. to drive condensation of the resin, gum and crosslinker toward completion. - View Dependent Claims (4)
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5. A method for providing a pressure sensitive adhesive composition, comprising condensing, at an elevated temperature in the presence of a base catalyst, a silanol-functional silicone resin, said resin comprising M structural units according to the formula R13SiO1/2, wherein each R1 is independently hydroxy or a monovalent hydrocarbon radical, and Q structural units according to the formula SiO4/2 in a ratio of M units to Q units of less than 1.1:
- 1, a silanol-functional polydiorganosiloxane gum, a crosslinker selected from the group consisting of alkoxysilane and poly(alkoxysiloxane), and water.
- View Dependent Claims (6)
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7. A method for making an article, comprising applying a layer of a silicone composition on at least a portion of at least one surface of a substrate, said silicone composition comprising the condensation reaction product of a silanol-functional silicone resin, said resin comprising M structural units according to the R13SiO1/2, wherein each R1 is independently hydroxy or a monovalent hydrocarbon radical, and Q structural units according to the formula SiO4/2 in a ratio of M units to Q units of less than 1.1:
- 1, a silanol-functional polydiorganosiloxane gum and a crosslinker selected from the group consisting of alkoxysilane and poly(alkoxysilane).
- View Dependent Claims (8, 9, 10)
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11. A method for making an article, comprising applying a layer of a silicone composition on at least a portion of at least one surface of a substrate, said silicone composition comprising the condensation reaction product of a silanol-functional silicone resin, said resin comprising M structural units according to the R13SiO1/2, wherein each R1 is independently hydroxy or a monovalent hydrocarbon radical, and Q structural units according to the formula SiO4/2 in a ratio of M units to Q units of less than 1.1:
- 1, a silanol-functional polydiorganosiloxane gum, a crosslinker selected from the group consisting of alkoxysilane and poly(alkoxysilane) and water.
Specification