Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1996-02-20
1997-10-28
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528279, 528280, 528283, 528285, 528286, 528296, 528302, 528307, 5283085, 5283086, C08G 6378
Patent
active
056819188
ABSTRACT:
This invention relates to a three step process for preparing copolyesters exhibiting a neutral hue, high clarity and increased brightness. The process involves reacting terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol in a feed mole ratio of total glycols to dicarboxylic acid of 1.7:1 to 6.0:1, at a temperature of 240.degree. C. to 280.degree. C., and a pressure of 15 psig to 80 psig to form an esterification product; adding a polycondensation catalyst and a toner; and polycondensing the product at a temperature of 260.degree. C. to 290.degree. C. and a reduced pressure to form a high molecular weight copolyester.
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Research Disclosure, No. 359, 1 Mar. 1994, pp. 142-144, XP000440539, "Improved Color Poly(Ethylene/1,4-Cyclohexylenedimethylene Terephthalate)", p. 241, Paragraph 1 Patent Abstracts of Japan, vol. 016, No. 556 (C-1007), 26 Nov. 1992.
Adams Valerie Sue
Hataway James Earl
Roberts Kenneth Alan
Acquah Samuel A.
Eastman Chemical Company
Griffis Andrew B.
Gwinnell Harry J.
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