Process for producing functional siloxanes of controlled structure
AssigneeMomentive Performance Materials Inc.
InventorsJohn M. Huggins, Hubertus Eversheim
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Abstract
Disclosed herein is a process for preparing a linear hydroxyaryloxy-functional polydiorganosiloxanes having controlled structures. The process includes the step of reacting a linear α,ω-bisacyloxypolydiorganosiloxane with at least one bisphenolic compound, or hydroxy-functional oligomer thereof, in such a molar ratio that the phenolic groups in the bisphenolic compound or the hydroxy-functional oligomer thereof to the acyloxy groups in the α,ω-bisacyloxypolydiorganosiloxane is less than 2.0. Also disclosed are hydroxyaryloxy-functional polydiorganosiloxanes produced from the process and the polysiloxane/polyorgano block copolymers made using the hydroxyaryloxy-functional siloxanes.
Claims15
A process for preparing a linear hydroxyaryloxy-functional polydialkylsiloxane of the general Formula (I)
- wherein Ar is a divalent C6 to C30 aryl, alkylaryl or aryloxy group or a residue of a bishydroxy-functional oligomer, each occurrence of R is independently a monovalent C1 to C20 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 R1 is independently a monovalent C1 to C20 alkyl, alkylaryl, or aryl group, and n is between 10 and 400, in a solvent composing at least one organic acid being a C2 to C6 carboxylic acid.
A polydiorganosiloxane/polyorgano (A-B), block copolymer comprising (i) polydiorganosiloxane blocks A and (ii) polycarbonate, polyester, polysulfone and/or polyether ether ketone oligomer blocks B with from 2 to 500 bisoxyorgano groups, wherein the polydialkylsiloxane blocks A are represented by the general Formula (III)
- wherein Ar is a divalent C6 to C30 aryl, alkylaryl or aryloxy group, each occurrence of R is independently a monovalent C1 to C20 alkyl, alkylaryl, or aryl group, n has an average value of 10 to 400, and m has an average value of 1.0 to 5.0,
- and x is between 1 and 1000.
Dependencies are inferred from the claim text.