Polyesters and their manufacture from acids and glycol carbonate

Details Polyesters and their manufacture from acids and glycol carbonate Polyesters and their manufacture from acids and glycol carbonate

1985-03-21

1986-06-10

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528308, 5283083, 528370, C08G 6300

Patent

active

045944067

ABSTRACT:
Poly(ethylene terephthalate), poly(1,4-cyclohexanedicarboxylate), poly(ethylene isophthalate), poly(ethylene naphthalate), their copolymers with each other and with modifying aliphatic dicarboxylic acids, and substituted glycol repeat unit modifications thereof are produced from prepolymer (oligomer) obtained from the esterification of the acid or acids with ethylene carbonate or substituted ethylenecarbonate in the presence of one or more amines compounds selected from trialkylamines, tetraalkyldiamines, N-alkylated heterocyclic amines, and certain quaternary ammonium salts, employing certain mole ratios of ethylene carbonate and substituted ethylene carbonate to the diacid. The prepolymer is formed in an unusually short time and the final polyester of high I.V. exhibits improvement in such properties as desirable light color and low ether-glycol level.

REFERENCES:
patent: 4521585 (1985-06-01), Thomsen et al.

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