Method for preparing pulverulent polymers exhibiting an apparent

Details Method for preparing pulverulent polymers exhibiting an apparent Method for preparing pulverulent polymers exhibiting an apparent

1973-11-19

1977-01-04

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

260 25B, 260 174SG, 264115, 264126, 264140, 264DIG13, 427195, 428304, 428327, 428402, B29D 2700, B29D 2708

Patent

active

040013600

ABSTRACT:
Polymeric bodies having selected morphological properties are prepared by effecting an apparent increase in the glass transition temperature of the polymer to cause it to become glassy and manipulating the polymer while it is in the glassy state. In the preferred practice of the invention, the apparent increase in the glass transition temperature is a reversible function so that after the morphological properties of the polymer have been developed, the normal glass transition temperature of the polymer may be restored.
The process of this invention finds utility in the preparation and formulation of polymers in powdered form; it provides a practical method for the formation of powders in unusual size ranges, which, in turn, makes possible the formation of shaped articles by novel processes; and it provides a simple method for making products, such as open-cell foams and surfaces in relief, that have unique physical characteristics.

REFERENCES:
patent: 2858282 (1958-10-01), Fairclough
patent: 2875047 (1959-02-01), Oster
patent: 3179607 (1965-04-01), Suda et al.
patent: 3215647 (1965-11-01), Dunn
patent: 3650995 (1972-03-01), Erickson
The Condensed Chemical Dictionary, Seventh Edition, Completely Revised and Enlarged by Arthur and Elizabeth Rose, New York, Reinhold, c 1966, p. 544.

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