C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
402/176, 260/539
C07C 63/15 (2006.01) C07C 51/60 (2006.01) C08G 63/40 (2006.01) C08G 63/64 (2006.01)
Patent
CA 1171880
ABSTRACT An alkali metal or alkaline earth metal salt of an aromatic or cycloaliphatic dicarboxylic acid such as the disodium or dipotassium salt of terephthalic or isophthalic acid is reacted with phosgene in an inert organic solvent in the presence of a tertiary nitrogen compound such as pyridine. The solid alkali metal or alkaline earth metal chloride salts which are by-products are easily separated from the organic solu- tion containing the product acid chloride. The solution is then, in some form, interfacially reacted with a bisphenol such as bisphenol A. Excess phosgene in the diacid chloride synthesis can be carried over to the polymerization if a poly(ester carbonate) is to be produced or removed if a polyester is to be produced. Certain low levels of a tertiary nitrogen compound with a pyridine nucleus in the organic solution do not interfere with the interfacial polymerization.
376211
Cooke Robert S.
Debona Bruce T.
Dege Gerald J.
Segal Leon
Van Buskirk Bruce
Allied Corporation
Gowling Lafleur Henderson Llp
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