Polyolefin-filled vinyloranopolysiloxane composition and method of preparation

Claim 2

A stable polymer-filled vinylorganopolysiloxane dispersion comprising two phases: i. a continuous phase comprising an essentially ungrafted vinylorganopolysiloxane fluid and intimately dispersed therein ii. a discontinuous phase comprising finely divided solid particles of an ungrafted polymer prepared from an organic monomer having aliphatic unsaturation or a mixture of such monomers polymerized in the presence of said vinylorganopolysiloxane.

Claim 3

The dispersion of claim 1 wherein said essentially ungrafted vinylorganopolysiloxane has structural units corresponding to the formula ##EQU6## wherein R is selected from the group consisting of a monovalent hydrocarbon radical, a halogenated monovalent hydrocarbon radical, a cyanoalkyl radical and mixtures thereof; R' is vinyl; a has a value of from 0 to 2.5, inclusive; b has a value of from 0.0005 to 2.0, inclusive, and the sum of a and b is equal to from 1.0 to 3, inclusive.

Claim 4

The dispersion of claim 1 wherein said polymer is a homopolymer of said organic monomer.

Claim 5

The dispersion of claim 1 wherein said polymer is a copolymer of two or more of said organic monomers.

Claim 6

The dispersion of claim 2 wherein R is selected from the group consisting of alkyl, cycloalkyl, aryl, aralkyl, haloalkyl, halogenated cycloalkyl, haloaryl, halogenated aralkyl, cyanoalkyl and mixtures thereof.

Claim 7

The dispersion of claim 2 wherein R is methyl.

Claim 8

The dispersion of claim 2 wherein said organic monomer is selected from the group consisting of an ethylenically unsaturated hydrocarbon, a vinyl halide, a vinyl ester, styrene, vinyl pyridine, vinyl naphthalene, acrylic acid, esters of acrylic acid, amides of acrlic acid and acrylonitrile.

Claim 9

The dispersion of claim 2 wherein said essentially ungrafted vinylorganopolysiloxane is a vinyl-stopped diorganopolysiloxane having the general formula ##STR3## wherein R" and R'" may be the same or different and are monovalent hydrocarbon radicals free of aliphatic unsaturation with at least 50 mole percent of the R'" group being methyl and wherein n has a value sufficient to provide a viscosity of from about 50,000 to 750,000 centipoise at 25° C.

Claim 10

The dispersion of claim 2 wherein said essentially ungrafted vinylorganopolysiloxane is a vinyl-stopped dimethylpolysiloxane.

Claim 11

The dispersion of claim 2 wherein said essentially ungrafted vinylorganopolysiloxane is present in an amount of from about 30% to about 95% by weight of the total dispersion and said polymer is present in an amount of from about 5 to about 70% by weight of the total dispersion.

Claim 12

The dispersion of claim 2 which further includes an inorganic filler.

Claim 13

The dispersion of claim 11 wherein said inorganic filler is selected from the group consisting of silica, carbon black, calcium carbonate, and iron oxide.

Claim 14

A room temperature vulcanizable composition comprising A. a stable dispersion comprising two phases: i. a continuous phase comprising an essentially ungrafted vinylorganopolysiloxane and intimately dispersed therein ii. a discontinuous phase comprising finely divided solid particles of a polymer prepared from an organic monomer having aliphatic unsaturation or mixture of said monomers polymerized in the presence of said vinylorganopolysiloxane; B. a crosslinking organohydrogenpolysiloxane; and C. a platinum catalyst.

Claim 15

A room temperature vulcanizable composition comprising A. a stable dispersion comprising two phases: i. a continuous phase comprising an essentially ungrafted vinylorganopolysiloxane and intimately dispersed therein ii. a discontinuous phase comprising finely divided solid particles of a polymer prepared from an organic monomer having aliphatic unsaturation or mixture of said monomers polymerized in the presence of said vinylorganopolysiloxane; B. a crosslinking organohydrogenpolysiloxane; and C. a platinum catalyst.

Claim 16

The room temperature vulcanizable composition of claim 13 wherein said essentially ungrafted vinylorganopolysiloxane has structural units corresponding to the formula ##EQU7## wherein R is selected from the group consisting of a monovalent hydrocarbon radical, a halogenated monovalent hydrocarbon radical, a cyanoalkyl radical, and mixtures thereof; R' is vinyl; a has a value of from 0 to 2.5, inclusive, b has a value of from 0.0005 to 2.0, inclusive, and the sum of a and b is equal to from 1.0 to 3, inclusive; and wherein said crosslinking organohydrogenpolysiloxane has structural units corresponding to the formula ##EQU8## wherein R is selected from the group consisting of a monovalent hydrocarbon radical, a halogenated monovalent hydrocarbon radical, a cyanoalky radical and mixtures thereof; a has a value of from 0 to 2.5, inclusive, b has a value of from 0.005 to 2.0, inclusive, and the sum of a and b is equal to from 0.8 to 3, inclusive.

Claim 17

The room temperature vulcanizable composition of claim 14 wherein R is selected from the group consisting of alkyl, cycloalkyl, aryl, aralkyl, haloalkyl, halogenated cycloalkyl, haloaryl, halogenated aralkyl, cyanoalkyl and mixtures thereof.

Claim 18

The room temperature vulcanizable composition of claim 15 wherein R is methyl.

Claim 19

The dispersion of claim 14 wherein said essentially ungrafted vinylorganopolysiloxane is a vinyl-stopped diorganopolysiloxane having the general formula ##STR4## wherein R" and R'" may be the same or different and are monovalent hydrocarbon radicals free of aliphatic unsaturation with at least 50 mole percent of the R'" group being methyl and wherein n has a value sufficient to provide a viscosity of from about 50,000 to 750,000 centipoise at 25° C.

Claim 20

The room temperature vulcanizable composition of claim 14 wherein said essentially ungrafted vinylorganopolysiloxane is a vinyl-stopped dimethylpolysiloxane.

Claim 21

The room temperature vulcanizable composition of claim 14 wherein said orgaic monomer is selected from the group consisting of an ethylenically unsaturated hydrocarbon, a vinyl halide, a vinyl ester, styrene, vinyl pyridine, vinyl naphthalene, acrylic acid, esters of acrylic acid, amides or acrylic acid and acrylonitrile.

Claim 22

The room temperature vulcanizable composition of claim 14 wherein said essentially ungrafted vinylorganopolysiloxane is present in an amount of from about 30% to about 95% by weight of the total dispersion and said polymer is present in an amount from about 5 to about 70% by weight of the total dispersion.

Claim 23

The room temperature vulcanizable composition of claim 14 which further includes an inorganic filler.

Claim 24

The room temperature vulcanizable composition of claim 21 wherein said inorganic filler is selected from the group consisting of silica, carbon black, calcium carbonate and iron oxide.

Claim 25

The cured product of claim 13.

Claim 26

The cured product of claim 14.

Claim 27

The cured product of claim 18.