Method for making carboxy aryl terminated organosiloxanes

C - Chemistry – Metallurgy – 07 – F

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260/442.8

C07F 7/18 (2006.01) C07F 7/08 (2006.01) C08G 64/18 (2006.01) C08G 77/04 (2006.01) C08G 77/14 (2006.01) C08G 77/445 (2006.01)

Patent

CA 2012806

RD-19,245 METHOD FOR MAKING CARBOXY ARYL TERMINATED ORGANOSILOXANES Abstract A method is provided for making carboxy aryl terminated organosiloxanes, such as l,1,3,3-tetramethyl-1,3- disiloxane diyl) bis(benzoic acid) by heating a mixture of an aqueous organic solvent and the corresponding haloacyl aryl terminated organosiloxane. The carboxy aryl terminated organosiloxanes of the present invention can be used to make silicone polyester block copolymers and silicone polycarbonate block copolymers where the silicone block is joined to the organic block by an ester linkage.

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