Formable polyvinyl chloride composition, foamed articles made th

Details Formable polyvinyl chloride composition, foamed articles made th Formable polyvinyl chloride composition, foamed articles made th

1993-04-27

1994-01-11

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 451, 4283144, 521140, 521145, B32B 712

Patent

active

052781984

ABSTRACT:
Foamable thermoplastic resin compositions are provided having vinyl chloride polymer, a graft copolymer having a superstrate grafted to a substrate wherein the superstrate has alphamethyl styrene, unsaturated nitrile, and unsubstituted styrene therein, and the substrate is a butadiene rubber, a rubber-free copolymer having alkylmethacrylate, vinyl aromatic, and unsaturated nitrile therein, and a chemical blowing agent. The foamable thermoplastic resin composition may be coextruded with a nonfoamed thermoplastic resin skin to produce a coextruded rigid foamed structure by a process of coextruding the skin and foamable thermoplastic composition. The composition and process are useful for making coextruded rigid foam structures which are useful in rigid foam applications such as foamed pipe and foamed sheet.

REFERENCES:
patent: 4041106 (1977-08-01), Ide et al.
patent: 4152495 (1979-05-01), Labar
patent: 4431772 (1984-02-01), Katto et al.
patent: 4613178 (1986-09-01), Fujita
patent: 4683247 (1987-07-01), Allen et al.
patent: 5095083 (1992-03-01), Deschamps et al.
Formulating Technology for Rigid Cellular PVC Sheet, Szamborski & Pfennig, Journal of Vinyl Technology, Jun. 1992, vol. 14, No. 2, pp. 105-109.

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