Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1992-11-19
1994-06-14
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528274, 528280, 528281, 528283, 528285, 528302, 528308, 5283086, 525437, 525444, 524 81, 524432, 524435, C08G 6302
Patent
active
053211170
ABSTRACT:
Macrocyclic poly(alkylene dicarboxylate) oligomers are prepared by the reaction of a dicarboxylic acid chloride such as terephthaloyl chloride with at least one bis(hydroxyalkyl) ester such as bis(4-hydroxybutyl) terephthalate, in the presence of a Lewis acid as catalyst. Illustrative Lewis acids are ferric chloride, zinc chloride, zinc bromide, stannous bromide and antimony pentachloride.
REFERENCES:
CA116(22):2154325; CA106(26):2144860; CA96(14):105110w CA89(14):110452u.
Droscher et al., "Poly(ethylene terephthalate): a solid Condensation Process", Polymer, vol. 19, 1978, pp. 43-47.
Goodman et al., "The Structures and Reversible Polymerization of Cyclic Oligomers from Poly(ethylene terephthalate)", Polymer 1, Sep. 1960, pp. 384-386.
Ross et al., "Isolation of a Cyclic Trimer from Polyethylene Terephthalate Film", J. Polymer Sci., 3, 406-407 (1954).
Org. Syn., Coll. vol. 3, 141-142 (1955).
Acquah Sam A.
General Electric Company
Kight III John
Pittman William H.
Squillante Edward A.
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