Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1991-01-25
1992-08-11
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528279, 528283, 528285, 528286, 528293, 528295, 528300, 528302, 528308, 5283086, 524711, 524713, 524779, 2641761, 2642107, C08G 6320
Patent
active
051380242
ABSTRACT:
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.
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Brozek Carl T.
Daly Robert C.
Fehnel Robert H.
Petropoulos Constantine C.
Acquah S. A.
Eastman Kodak Company
Gerlach Robert A.
Kight III John
Levitt Joshua G.
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