Polyorganosiloxane composition

Claim 2

A polyorganosiloxane composition comprising: (a) a silicone composition curable to a rubber containing polysiloxane which is liquid at room temperature as a base polymer, said silicone composition selected from the group consisting of an addition cure type composition and a condensation cure type composition; and (b) a polymer of monomer units comprising acrylic acid or an alkali metal salt of acrylic acid or an alkali meal salt of acrylic acid.

Claim 3

A composition according to claim 1, wherein said silicone composition of the component (A) is an addition cure type.

Claim 4

A composition according to claim 2, wherein said curable silicone rubber composition of the component (A) is characterized by the following components: (C) 100 parts by weight of polyorganosiloxane having at least two units in a molecule represented by the following formula: ##STR5## wherein R 1 represents an alkenyl group, R 2 a substituted or unsubstituted monovalent hydrocarbon group which contains no aliphatic unsaturated bond, a an integer of 1 or 2, b is an integer between 0 and 2 inclusive, and a+b is an integer between 1 and 3 inclusive; (D) polyorganohydrogensiloxane in quantities in which the number of hydrogen atoms which are combined with a silicon atom is 0.5 to 4.0 per R 1 group in polyorganosiloxane (C), and the molecules on average comprising at least three units represented by the formula: ##STR6## wherein R 3 represents a substituted or unsubstituted monovalent hydrocarbon group, c is an integer between 0 and 2 inclusive, d is an integer of 1 or 2, and c+d is an integer between 1 and 3 inclusive; and (E) 1 to 100 ppm of platinum or platinum compound catalyst, as platinum with respect to polyorganosiloxane (C).

Claim 5

A composition according to claim 3, wherein said polymer containing acrylic acid or an alkali metal salt of acrylic acid as a monomer unit of the component (B) is added in an amount of 0.5 to 200 parts by weight per 100 parts by weight of said polyorganosiloxane of component (C).

Claim 6

A composition according to claim 4, wherein said R 1 in the component (C) is a vinyl group.

Claim 7

A composition according to claim 4, wherein said polyorganosiloxane of the component (D) is represented by the following formula: ##STR7## wherein R4 represents a hydrogen atom or a methyl group, p is an integer between 1 and 100 inclusive and between 3 and 100 inclusive when said two R 4 s are methyl groups, and q is an integer-between 0 and 100.

Claim 8

A composition according to claim 4, wherein said polyorganosiloxane of component (D) comprises (CH 3 ) 2 HSiO 1/2 units and SiO 2 units, and the content of hydrogen atoms which are combined with a silicon atom is 0.3 to 1.2% by weight of the molecular weight.

Claim 9

A composition according to claim 4, wherein the component (B) is an acrylic acid-vinyl alcohol copolymer, a sodium acrylate polymer or a sodium acrylate-acrylamide copolymer.

Claim 10

A composition according to claim 1, wherein said silicone composition is of a condensation cure type.

Claim 11

A composition according to claim 9, wherein said curable silicone rubber composition is characterized by the following components: (F) 100 parts by weight of silanol end blocked polyorganosiloxane having a viscosity of 500 to 500,000 cSt at 25° C.; and (G) a curing agent comprising an organic silicone compound having at least three silicon bonded hydrolyzable groups per molecule.

Claim 12

A composition according to claim 10, wherein said polymer containing acrylic acid or an alkali metal salt of acrylic acid as a monomer unit of component (B) is added in an amount of 0.5 to 200 parts by weight per 100 parts by weight of said polyorganosiloxane of component (F).

Claim 13

A composition according to claim 11, wherein component (B) is an acrylic acid-vinyl alcohol copolymer, a sodium acrylate polymer or a sodium acrylate-acrylamide copolymer.