Extrusion foaming of normally crystalline vinylidene chloride po

Details Extrusion foaming of normally crystalline vinylidene chloride po Extrusion foaming of normally crystalline vinylidene chloride po

1974-09-20

1976-09-28

Kight, III, John

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25E, C08J 918

Patent

active

039830802

ABSTRACT:
This invention is directed to a process for forming stable, low density, fine celled extruded foam from normally crystalline vinylidene chloride polymers such process comprising (1) forming an admixture of a normally crystalline vinylidene chloride polymer in powder form with a blowing agent composed of a compound or mixture of compounds having a boiling point of less than about 40.degree.C, a vapor pressure at the foaming temperature used of greater than atmospheric pressure and less than about 1000 p.s.i. and a solubility parameter of greater than about 6.6 and less than about 8.7, then (2) extrusion foaming the admixture using an extrusion temperature of from about 120.degree.C to about 150.degree.C.

REFERENCES:
patent: 3474049 (1969-10-01), Chuppelear et al.
patent: 3650992 (1972-03-01), Schwoegler
patent: 3751377 (1973-08-01), Buckney
patent: 3776989 (1973-12-01), Annis et al.
patent: 3821129 (1974-06-01), Johnson

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