Provided are an ultraviolet curable organopolysiloxane composition having a favorable ultraviolet curability; and a cured product thereof that has a favorable adhesiveness. The ultraviolet curable organopolysiloxane composition contains: (A) a compound represented by the following general formula (1)

##STR00001## wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, the multiple R.sup.1s may be identical to or different from each other, and each R.sup.2 independently represents a hydrogen atom, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms or a triorganosilyl group; and an ultraviolet curable organopolysiloxane.

Provided are an ultraviolet curable organopolysiloxane composition having a favorable ultraviolet curability; and a cured product thereof that has a favorable adhesiveness. The ultraviolet curable organopolysiloxane composition contains: (A) a compound represented by the following general formula (1)

##STR00001## wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, the multiple R.sup.1s may be identical to or different from each other, and each R.sup.2 independently represents a hydrogen atom, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms or a triorganosilyl group; and an ultraviolet curable organopolysiloxane.

Cured silicone rubbers for acoustic damping, and formulations and methods used to make the same, are provided.

Cured silicone rubbers for acoustic damping, and formulations and methods used to make the same, are provided.

A two part curable composition comprising organosiloxane polymer; water; an organosilane such as hexamethyldisilazane (HMDS) or vinyltrimethoxysilane; crosslinker; adhesion promoter and catalyst; and optionally comprising plasticizer; colorant and filler. The first part can comprise organosiloxane polymer and water. The second part can comprise crosslinker; adhesion promoter and catalyst. Either or both parts can optionally further comprise an organosilane such as hexamethyldisilazane (HMDS) or vinyltrimethoxysilane; plasticizer; colorant and filler. Cured reaction products of the two part curable organosiloxane composition has good adhesion to metallic sealing surfaces and good resistance engine oil and other automotive fluids. Cured reaction products of the two part curable organosiloxane composition can surprisingly retain physical properties after long-term exposure to temperatures between 200° C. and 250° C. and can retain physical properties after exposure to temperatures between 250° C. to 300° C. for short periods.

A two part curable composition comprising organosiloxane polymer; water; an organosilane such as hexamethyldisilazane (HMDS) or vinyltrimethoxysilane; crosslinker; adhesion promoter and catalyst; and optionally comprising plasticizer; colorant and filler. The first part can comprise organosiloxane polymer and water. The second part can comprise crosslinker; adhesion promoter and catalyst. Either or both parts can optionally further comprise an organosilane such as hexamethyldisilazane (HMDS) or vinyltrimethoxysilane; plasticizer; colorant and filler. Cured reaction products of the two part curable organosiloxane composition has good adhesion to metallic sealing surfaces and good resistance engine oil and other automotive fluids. Cured reaction products of the two part curable organosiloxane composition can surprisingly retain physical properties after long-term exposure to temperatures between 200° C. and 250° C. and can retain physical properties after exposure to temperatures between 250° C. to 300° C. for short periods.

Provided is a curable organopolysiloxane composition for forming a film, which has low viscosity before curing, has excellent mechanical strength and dielectric breakdown strength after curing, and can provide a uniform and thin organopolysiloxane cured film. The curable organopolysiloxane composition comprises: a curing reactive organopolysiloxane, a curing agent, (D1) reinforcing fine particles having a BET specific surface area exceeding 100 m.sup.2/g, which have been surface treated with an organic silicon compound, and (D2) reinforcing fine particles having a BET specific surface area within a range of 10 to 100 m.sup.2/g, which have been surface treated with an organic silicon compound. The mass ratio of components (D1) and (D2) is within a range of 50:50 to 99:1, and the sum of components (D1) and (D2) is within a range of 10 to 40 mass %. A method of manufacturing an organopolysiloxane cured film using the curable organopolysiloxane composition is also provided.

Provided is a curable organopolysiloxane composition for forming a film, which has low viscosity before curing, has excellent mechanical strength and dielectric breakdown strength after curing, and can provide a uniform and thin organopolysiloxane cured film. The curable organopolysiloxane composition comprises: a curing reactive organopolysiloxane, a curing agent, (D1) reinforcing fine particles having a BET specific surface area exceeding 100 m.sup.2/g, which have been surface treated with an organic silicon compound, and (D2) reinforcing fine particles having a BET specific surface area within a range of 10 to 100 m.sup.2/g, which have been surface treated with an organic silicon compound. The mass ratio of components (D1) and (D2) is within a range of 50:50 to 99:1, and the sum of components (D1) and (D2) is within a range of 10 to 40 mass %. A method of manufacturing an organopolysiloxane cured film using the curable organopolysiloxane composition is also provided.

Provided is an antistatic silicone rubber composition. The composition comprises at least one lithium compound selected from the group consisting of a lithium amide, lithium silylamide, lithium alkyl phosphate salt, lithium phenoxide, lithium sulfate and a lithium permanganate, in an amount of from about 0.1 to about 15 mass % of the composition. In general, the composition may comprise: (A) an organopolysiloxane having at least two silicon atom-bonded alkenyl groups per molecule; (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule; (C) a hydrosilylation catalyst; and (D) the at least one lithium compound as described above. The composition generally exhibits good curability, and cures to form a silicone rubber exhibiting excellent antistatic properties.

Provided is an antistatic silicone rubber composition. The composition comprises at least one lithium compound selected from the group consisting of a lithium amide, lithium silylamide, lithium alkyl phosphate salt, lithium phenoxide, lithium sulfate and a lithium permanganate, in an amount of from about 0.1 to about 15 mass % of the composition. In general, the composition may comprise: (A) an organopolysiloxane having at least two silicon atom-bonded alkenyl groups per molecule; (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule; (C) a hydrosilylation catalyst; and (D) the at least one lithium compound as described above. The composition generally exhibits good curability, and cures to form a silicone rubber exhibiting excellent antistatic properties.