Patent ID: 8912290

Claim:
A process for preparing a linear hydroxyaryloxy-functional polydialkylsiloxane of the general Formula (I) wherein Ar is a divalent C 6 to C 30 aryl, alkylaryl or aryloxy group or a residue of a bishydroxy-functional oligomer, each occurrence of R is independently a monovalent C 1 to C 20 alkyl, alkylaryl, or aryl group, n has an average value of from 10 to 400, and m has an average value of from 1.0 to 5.0, wherein the process comprises: reacting a linear α,ω-bisacyloxypolydiorganosiloxane of the general Formula (II) with at least one bisphenolic compound, or a bishydroxy-functional oligomer thereof, in such a molar ratio that the phenolic groups in the bisphenolic compound or the bishydroxy-functional oligomer thereof to the acyloxy groups in the α,ω-bisacyloxypolydialkylsiloxane is less than 2.0, wherein the general Formula (II) is wherein each occurrence of R and R 1 is independently a monovalent C 1 to C 20 alkyl, alkylaryl, or aryl group, and n is between 10 and 400, in a solvent composing at least one organic acid being a C 2 to C 6 carboxylic acid.