Foam crystallization of condensation polymers

Details Foam crystallization of condensation polymers Foam crystallization of condensation polymers

1980-04-21

1982-01-26

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 54, 264 85, 264141, 264176R, 264176F, 264230, 521 79, 521 80, C08G 6300

Patent

active

043129609

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.

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patent: 3384696 (1968-05-01), Makansi
patent: 3585259 (1971-06-01), Lefferts et al.
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patent: 4097425 (1978-06-01), Niznik
Brydson, J. A., "Plastics Materials", Princeton, N.J., D. Van Nostrand, .COPYRGT.1966, pp. 446-448.
Frazer, A. H., "High Temperature Resistant Polymers", New York, Interscience, .COPYRGT.1968, pp. 106-108.

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