Method for preparing cyclie polyarylate oligomers

Details Method for preparing cyclie polyarylate oligomers Method for preparing cyclie polyarylate oligomers

C - Chemistry, Metallurgy

08

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402/203

C08G 63/19 (2006.01) C08G 63/195 (2006.01) C08G 63/87 (2006.01)

Patent

CA 2013351

RD-19193 ABSTRACT METHOD FOR PREPARING CYCLIC POLYARYLATE OLIGOMERS Cyclic polyarylate oligomer compositions are prepared by the reaction of an aromatic dicarboxylic acid halide, such as isophthaloyl chloride or terephthaloyl chloride, with a water-soluble salt of a dihydroxyaromatic compound, such as bisphenol A disodium salt. Freshly prepared solutions of the halide in an organic liquid such as methylene chloride, and of the salt in water, are simul- taneously introduced into an organic liquid containing a catalytic amount of at least one quaternary ammonium salt having a single alkyl group containing about 8-20 carbon atoms and having not more than 5 additional carbon atoms. The dihydroxyaromatic compound salt is employed in the amount of at least about 3% in excess of stoichiometric.

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