05138024 is referenced by 11 patents and cites 9 patents.

A copolyester is synthesized by reacting a dialkyl ester of an aromatic dicarboxylic acid (e.g., dimethyl terephthalate) with ethylene glycol, low molecular weight poly(ethylene glycol) and a salt of a sulfonic acid-substituted aromatic dicarboxylate (e.g., sodium sulfoisophthalic acid) simultaneously in a first stage reaction in the presence of a phosphite or phosphate stabilizer. The intermediate product of the first stage is further reacted in a second stage in the presence of a polycondensation catalyst to obtain a random copolyester of the desired molecular weight. The copolyester is extruded to form a film which, after orientation and heat setting, has excellent clarity and is useful as a photographic film support. Aqueous processing of the film relaxes any core set or curl.

Title
Modified polyester useful as photographic roll film support
Application Number
7/645945
Publication Number
5138024
Application Date
January 25, 1991
Publication Date
August 11, 1992
Inventor
Constantine C Petropoulos
Webster
NY, US
Robert H Fehnel
Rochester
NY, US
Robert C Daly
Greece
NY, US
Carl T Brozek
Webster
NY, US
Agent
Joshua G Levitt
Robert A Gerlach
Assignee
Eastman Kodak Company
NY, US
IPC
C08G 63/20
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