Semi or fully continuous process for polyester of bisphenol...

Details Semi or fully continuous process for polyester of bisphenol... Semi or fully continuous process for polyester of bisphenol...

C - Chemistry, Metallurgy

08

G

402/202, 402/214

C08G 63/16 (2006.01) C08G 63/19 (2006.01) C08G 63/78 (2006.01)

Patent

CA 1166398

ABSTRACT Linear aromatic polyesters of bisphenols and dicarboxylic compounds are prepared by transesterification polymerization in either a fully continuous process or in a semi-continuous process wherein a first stage is conducted batchwise and a second stage is conducted in a continuous manner wherein the second stage employs a wiped film reactor, alternatively, a wiped film reactor followed by a vented extrusion reactor. The processes are preferably conducted in the presence of a catalyst in liquid form, and further under conditions wherein th? catalyst is introduced to the polymerization concurrent with the introduction of liquid phase reactants to avoid sub- stantial heating of the reactants in contact with the catalyst prior to onset of the transesterification reaction. The products of the processes have an unexpectedly low polydispersity.

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