Process for producing aromatic polyesters having increased degre

Details Process for producing aromatic polyesters having increased degre Process for producing aromatic polyesters having increased degre

1980-03-25

1981-09-22

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

260 458NZ, 525437, 528274, C08G 6344, C08G 7316

Patent

active

042911524

ABSTRACT:
A process for producing an aromatic polyester having an increased degree of polymerization. The process comprises reacting a hydroxyl-terminated, substantially linear, fiber-forming aromatic polyester having an aromatic dicarboxylic acid as a main acid component at an elevated temperature with a bi-cyclic imino ester compound of formula [I] or formula [II]. According to the process, the molecular chains of the aromatic polyester are bonded to each other by the terminal hydroxyl groups thereof to form rapidly the aromatic polyester having an increased degree of polymerization.

REFERENCES:
patent: 3433770 (1969-03-01), Shima et al.
patent: 3444141 (1969-05-01), Shima
patent: 3553157 (1971-01-01), Diskstra et al.
patent: 3637910 (1972-01-01), Shima
patent: 3714125 (1973-01-01), Shima et al.
patent: 3787370 (1974-01-01), Shima et al.
patent: 3984379 (1976-10-01), Oka et al.

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