Foamable PVC resin formulation, process for foaming, and product

Details Foamable PVC resin formulation, process for foaming, and product Foamable PVC resin formulation, process for foaming, and product

1976-07-28

1977-06-21

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25P, 260 23EP, 260 304R, 260 318R, 526278, C08J 910

Patent

active

040310450

ABSTRACT:
A foamable polyvinyl chloride (PVC) resin formulation containing (1) a copolymer formed by emulsion polymerizing from about 70% to about 90% vinyl chloride, from about 5% to about 15% vinyl acetate and from about 5% to about 15% of a bis(hydrocarbyl)vinylphosphonate; (2) a polyester or epoxy plasticizer (or mixture thereof) and (3) 4,4'-oxybis (benzene sulfonyl hydrazide) is foamed to form a product having a smooth unblistered surface, good cell quality and medium density. The foaming can take place at a temperature of from about 320.degree. F. (160.degree. C.) to about 400.degree. F. (204.degree. C.) for a period of time of from about 6 to about 20 minutes.

REFERENCES:
patent: 3691127 (1972-09-01), Kraft et al.
patent: 3943085 (1976-03-01), Kraft et al.

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