Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1977-10-25
1980-03-04
Phynes, Lucille M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
528176, 528272, C07C 6800, C07C 6996
Patent
active
041917057
ABSTRACT:
The present invention relates to a process for the preparation of carbonic acid esters of polyester-polyols by transesterifying the polyols with carbonic acid aryl esters at elevated temperatures under vacuum in the presence of a catalyst. The reaction conditions are controlled to avoid the formation of by-products and the chain extension of the polyester-polyols. The present invention is also concerned with the polyester carbonic acid esters so formed, their use in producing polycarbonate block copolymers and the copolymers so produced. The copolymers may be produced by transesterifying the polyester carbonic acid esters with bisphenols and subjecting the bis-hydroxyaryl carbonates so formed to normal polycarbonate synthesis such as interfacial or melt polycondensation.
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Bartl Herbert
Freitag Dieter
Konig Klaus
Lindner Christian
Schreckenberg Manfred
Bayer Aktiengesellschaft
Harsh Gene
Phynes Lucille M.
Pope Lawrence S.
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