Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1979-09-25
1981-02-03
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528176, 528190, 528191, 528194, 528295, 528298, 528299, C08G 6318
Patent
active
042489954
ABSTRACT:
A process is disclosed for the production of alkylaromatic copolyesters, characterized in that there are reacted, successively, at a temperature below 250.degree. C., a diester of a dihydroxyaromatic compound and an aliphatid diacid of the general formula HOOC(CH.sub.2).sub.n COOH, in which 3.ltoreq.n.ltoreq.10, with a molar ratio of the diester to the diacid of between 1.5 and 4, until the degree of completion of the reaction is greater than or equal to 85%, and them, at a temperature above 250.degree. C., an aromatic and/or cycloaliphatic dicarboxylic acid, and in that the product obtained is subjected to a polycondensation reaction under reduced pressure for a duration which is less than or equal to 1 hour 30 minutes. This process makes it possible to produce copolyesters which may be readily converted in the molten state to threads, films and molded articles.
REFERENCES:
patent: 3567687 (1971-03-01), Lohwasser et al.
patent: 3740375 (1973-06-01), Novak
patent: 4064108 (1977-12-01), Inata et al.
patent: 4071499 (1978-01-01), Stackman et al.
patent: 4083829 (1978-04-01), Calundann et al.
patent: 4197393 (1980-04-01), Swedo et al.
Phynes Lucille M.
Rhone-Poulenc Industries
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