Semi or fully continuous process for polyester of bisphenol and

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

1983-04-11

1984-08-14

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

526 65, 528179, 528180, 528194, C08G 6322

Patent

active

044658192

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 the catalyst is introduced to the polymerization concurrent with the introduction of liquid phase reactants to avoid substantial 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.

REFERENCES:
patent: 4319017 (1982-03-01), Kosanovich et al.
patent: 4415721 (1983-11-01), Kosanovich et al.

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