Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1993-11-03
1994-06-28
Foelak, Morton
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 461, B29D 700
Patent
active
053244613
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 non-foamed 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.
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Formulating Technology for Rigid Cellular PC Sheet, Szamborski & Pfennig, Journal of Vinyl Technology, Jun. 1992, vol. 14, No. 2, pp. 105-109.
Foelak Morton
General Electric Company
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