Method for preparation of macrocyclic poly(alkylene dicarboxylat

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

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528302, 528308, 5283086, 528397, 525437, 525444, 524186, 524236, 524320, 524601, 524605, 524714, 524717, C08G 6320

Patent

active

052311619

ABSTRACT:
Macrocyclic poly(alkylene dicarboxylate) oligomers are prepared in high yield 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 highly unhindered amine or a mixture thereof with at least one other tertiary amine such as triethylamine, in a substantially inert organic solvent such as methylene, chlorobenzene or a mixture thereof. The concentration of the reagents in the reaction mixture are at least 0.08M.

REFERENCES:
patent: 4217438 (1980-08-01), Brunelle et al.
patent: 4368315 (1983-01-01), Sikdar
patent: 4433117 (1984-02-01), Takayanagi et al.
patent: 5039783 (1991-08-01), Brunelle et al.
patent: 5157103 (1992-10-01), Kantor et al.

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