Polysulfide alkoxy silane coupling agents
AssigneeUnion Carbide Corporation
InventorThomas C. Williams
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Abstract
The coupling action of polysulfide alkoxy silanes in rubbers is enhanced by the utilization of triorganophosphine compositions.
Claims7
A dry concentrate which comprises (I) a triorganophosphine of the formula R.sup.1 R.sup.2 R.sup.3 P, wherein each of R.sup.1, R.sup.2, and R.sup.3 represents an alkyl radical having up to eight carbon atoms, (II) water, (III) lower alkanol, and (IV) porous inert inorganic solid.
A dry concentrate which comprises (I) a polysulfide alkoxysilane coupling agent of the formula ##STR5## wherein X represents an alkoxy radical, R' represents an alkyl radical having up to four carbon atoms, y has a value of from 0 to 2 inclusive, R represents a divalent bridging group selected from the group consisting of alkylene and alkyleneoxy radicals having up to seven carbon atoms, n has a value of 0 or 1, p has a value of 0 or 1, Ar represents an aryl radical containing from 6 to 12 carbon atoms, (S).sub.x represents a divalent polysulfide radical each free valence thereof being directly bonded to an aromatic carbon atom of an Ar radical whereby each Ar radical is bonded to another Ar radical through a (S).sub.x radical, x has a value of from 2 to 6, a has a value of at least 2, b has a value of at least 1, and the ratio of a to b is a value of not more than 2, (II) a triorganophosphine of the formula R.sup.1 R.sup.2 R.sup.3 P, wherein each of R.sup.1, R.sup.2, and R.sup.3 represents an alkyl radical having up to eight carbon atoms, (III) water, (IV) lower alkanol, and (V) porous inert inorganic solid.
Dependencies are inferred from the claim text.