Method of making a foamable film

Details Method of making a foamable film Method of making a foamable film

1996-06-24

1998-03-31

Kuhns, Allen R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 453, 264344, B29C 4420, B29C 7100

Patent

active

057334889

ABSTRACT:
The present invention is directed to a method of making a foamable film of at least one thermoplastic resin with at least one liquid blowing agent incorporated therein, said method comprising forming the thermoplastic resin and a liquid swelling agent for the thermoplastic resin into a layer, contacting the said layer with the liquid blowing agent and replacing at least part of the swelling agent in the resin by the liquid blowing agent.

REFERENCES:
patent: 4118449 (1978-10-01), Rinde
patent: 4174425 (1979-11-01), Saito et al.
patent: 4419308 (1983-12-01), Matsumura et al.
patent: 4438222 (1984-03-01), Nakagawa et al.
patent: 5185111 (1993-02-01), Lazar

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