Process for the preparation of carbonic acid aryl esters of poly

Details Process for the preparation of carbonic acid aryl esters of poly Process for the preparation of carbonic acid aryl esters of poly

1978-03-13

1980-08-12

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

525439, C07C 6806, C08G 6362

Patent

active

042172977

ABSTRACT:
The present invention relates to a process for the preparation of bis-carbonic acid monoaryl esters of polyester-diols, lengthened via --OCOO-- groups, characterized in that polyester-diols with molecular weights Mn (number-average) of over 250, preferably over 600, are heated with carbonic acid bis-aryl esters at temperatures between about 100.degree. C. and 200.degree. C., preferably between about 110.degree. C. and 180.degree. C., in vacuo below about 35 mm Hg, preferably between about 25 and 1 mm Hg, in the presence of catalysts, less than one mol of carbonic acid bis-aryl ester being employed per mol of OH group of the polyester-diol and the hydroxyaryl compounds formed being distilled off.
The invention further relates to the bis-carbonic acid aryl esters of polyester-diols lengthened via --OCOO-- groups.

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