Method of improving processability of rigid polymers

Details Method of improving processability of rigid polymers Method of improving processability of rigid polymers

1979-05-18

1982-10-05

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528480, 528348, 528353, 528363, C08G 6946, C08G 7310, C08G 7318

Patent

active

043529275

ABSTRACT:
A method of improving the processability of rigid polymers, particularly of unprocessable rigid polymers, wherein the rigid polymer in melt or solution form is subjected to an apparent shear rate between relatively moving surfaces of at least 100 sec.sup.-1, particularly between 100 and 1000 sec.sup.-1. The method reduces the viscosity of the melt or solution and when the melt or solution is fabricated into shaped articles while the viscosity is so reduced the shaped articles have improved properties, particularly more uniform orientation when compared with products prepared by methods which do not include the pre-shearing step prior to fabrication.

REFERENCES:
patent: 3428602 (1969-02-01), Haller
patent: 3631017 (1971-12-01), Rettig et al.
patent: 3671542 (1972-06-01), Kwolek
patent: 3732349 (1973-05-01), Chen et al.
patent: 4093692 (1978-06-01), Hill
Freelance Translation-Plaste u Kautschuk, 22, 12, 1975, pp. 970-975.
Freelance Translation-Belgian Patent 511,763, published 18 Dec. 1953.

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