Macrocyclic polyester oligomer preparation with Lewis acid as ca

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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528274, 528280, 528281, 528283, 528285, 528302, 528308, 5283086, 525437, 525444, 524 81, 524432, 524435, C08G 6302

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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).

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