Foam crystallization of condensation polymers

Details Foam crystallization of condensation polymers Foam crystallization of condensation polymers

1979-01-18

1980-09-23

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 85, 264141, 264176R, 264176F, 521 79, 521182, B29D 2700

Patent

active

042242649

ABSTRACT:
A normally amorphous condensation polymer is crystallized by foaming it with a chemical blowing agent at a temperature above the softening point of the polymer, extruding the molten polymer to form a solid foam and maintaining the foam at a temperature above the glass transition temperature until crystallization occurs. The crystallized polymer foam may be used as a structural foam. It can be used in solid state polymerization to obtain polymers of enhanced degree of polymerization.

REFERENCES:
patent: 3036991 (1962-05-01), Kantor et al.
patent: 3227784 (1966-01-01), Blades et al.
patent: 3384696 (1968-05-01), Makansi
patent: 3585259 (1971-06-01), Lefferts et al.
patent: 3586647 (1971-06-01), Kremer
patent: 4051112 (1977-09-01), Kuratsuji et al.
patent: 4097421 (1978-06-01), Chang
patent: 4097425 (1978-06-01), Niznik
Brydson, J. A. "Plastics Materials" Princeton, N.J., D. Van Nostrand, c 1966; p. 446-448.
Frazer, A. H. "High Temperature Resistant Polymers" New York, Interscience, c 1968, pp. 106-108.

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