C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/202, 402/214
C08G 63/18 (2006.01) C08G 63/19 (2006.01) C08G 63/78 (2006.01)
Patent
CA 1193390
ABSTRACT Improved linear aromatic polyesters of bisphenols and dicarboxylic compounds are prepared by improved transesterification polymerization processes involving the use of liquid catalysts such as normally solid materials in molten form and normally solid mate- rials in solution in a solvent for the catalyst. The improved processes comprise introducing a catalyst and liquid state reactants substantially concurrently to the polymerization reaction to avoid substantial heating of the reactants in contact with the catalyst prior to onset of the transesterification reaction. It is pre- ferred to carry out the transesterification in a fully continuous process or in a semi-continuous process which employs an initial batchwise reaction, followed by continuous reaction using a wiped film reaction vessel. The products of the processes have un- expectedly low polydispersity.
370474
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Occidental Chemical Corporation
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