Self-adhering silicone compositions and preparations thereof

Claim 1

A composition comprising a product obtained by mixing (A) vinyl-containing polyorganosiloxane having an average of about two silicon-bonded vinyl radicals per molecule, an average ratio of organo radicals per silicon atom within a range greater than 2 up to and including 2.03, and each organo radical of the polyorganosiloxane being a monovalent radical selected from the group consisting of hydrocarbon radicals and fluorinated alkyl radicals both having less than 7 carbon atoms per radical, (B) an organosilicon compound having an average of at least 3 silicon-bonded hydrogen atoms per organosilicon compound molecule and valences of any silicon atom in the organosilicon compound not satisfied by a hydrogen atom is satisfied by a divalent oxygen atom or an organo radical wherein each organo radical is a monovalent radical selected from the group consisting of hydrocarbon radicals and fluorinated alkyl radicals both having less than 7 carbon atoms per radical, the organosilicon compound having no more than one silicon-bonded hydrogen atom on any one silicon atom, (C) a platinum catalyst, (D) polysiloxane having an average of at least one silicon-bonded hydroxyl radical per molecule and an average of at least one silicon-bonded vinyl radical per molecule, the polysiloxane having siloxane units bonded through silicon-oxygen-silicon bonds and valences of each silicon atom in the polysiloxane are satisfied by at least one of monovalent alkyl radical having less than 7 carbon atoms per radical, phenyl radical, vinyl radical and hydroxyl radical and the remaining valences of silicon being satisfied by divalent oxygen atoms, the polysiloxane having an average of less than 15 silicon atoms per molecule, and (E) a silane having at least one epoxy-containing organo group, at least one silicon-bonded alkoxy group having less than 5 carbon atoms per group, and any remaining valences on the silane not satisfied by an epoxy-containing organo group or an alkoxy group is satisfied by a monovalent hydrocarbon radical or a fluorinated alkyl radical both having less than 7 carbon atoms per radical, (A) and (B) being present in amounts sufficient to provide a mol ratio of silicon-bonded hydrogen atoms in (B) to silicon-bonded vinyl radical in (A) of 0.5 to 10, combined weight of (D) and (E) being present in amounts of 0.1 to 5 parts by weight per 100 parts by weight of the composition exclusive of the weight of (D) and (E), and (D) and (E) being present in a weight ratio of 0.25 to 1.8 parts by weight (E) per one part by weight (D).

Claim 17

A method for preparing an adhesion additive suitable for use in silicone elastomer compositions comprising mixing under essentially anhydrous conditions at a temperature lower than 50° C., (d) polysiloxane having an average of at least one silicon-bonded hydroxyl radical per molecule and an average of at least one silicon-bonded vinyl radical per molecule, the polysiloxane having siloxane units bonded through silicon-oxygen-silicon bonds and valences of each silicon atom in the polysiloxane are satisfied by at least one of monovalent alkyl radical having less than 7 carbon atoms per radical, phenyl radical, vinyl radical, and hydroxyl radical, and the remaining valences of silicon being satisfied by divalent oxygen atoms, the polysiloxane having an average of less than 15 silicon atoms per molecule, and (E) a silane having at least one epoxy-containing organo group, at least one silicon-bonded alkoxy group having less than 5 carbon atoms per group and any remaining valences on the silane not satisfied by an epoxy-containing organo group or an alkoxy group is satisfied by a monovalent hydrocarbon radical or a fluorinated alkyl radical both having less than 7 carbon atoms per radical, where (D) and (E) are present in a weight ratio of 0.25 to 1.8 parts by weight (E) per one part by weight (D), resulting in an adhesion additive.

Claim 18

A method for preparing an adhesion additive suitable for use in silicone elastomer compositions comprising mixing under essentially anhydrous conditions at a temperature lower than 50° C., (d) polysiloxane having an average of at least one silicon-bonded hydroxyl radical per molecule and an average of at least one silicon-bonded vinyl radical per molecule, the polysiloxane having siloxane units bonded through silicon-oxygen-silicon bonds and valences of each silicon atom in the polysiloxane are satisfied by at least one of monovalent alkyl radical having less than 7 carbon atoms per radical, phenyl radical, vinyl radical, and hydroxyl radical, and the remaining valences of silicon being satisfied by divalent oxygen atoms, the polysiloxane having an average of less than 15 silicon atoms per molecule, and (E) a silane having at least one epoxy-containing organo group, at least one silicon-bonded alkoxy group having less than 5 carbon atoms per group and any remaining valences on the silane not satisfied by an epoxy-containing organo group or an alkoxy group is satisfied by a monovalent hydrocarbon radical or a fluorinated alkyl radical both having less than 7 carbon atoms per radical, where (D) and (E) are present in a weight ratio of 0.25 to 1.8 parts by weight (E) per one part by weight (D), resulting in an adhesion additive.