Method of making a foamable film
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United States of America Patent
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Mar 31, 1998
Grant Date -
N/A
app pub date -
Jun 24, 1996
filing date -
Jun 23, 1995
priority date (Note) -
Expired
status (Latency Note)
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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.
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