Methods of making foamed materials of blended thermoplastic polymers using carbon dioxide
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United States of America Patent
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Sep 14, 2004
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N/A
app pub date -
Mar 1, 2000
filing date -
Sep 20, 1999
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Abstract
A method of producing a foamed material comprises contacting a mixture comprising a first thermoplastic polymer and a second thermoplastic polymer with a blowing agent, wherein the first thermoplastic polymer has a higher percent crystallinity that the second thermoplastic polymer; and subjecting the mixture to conditions sufficient to create a thermodynamic instability in the blend foam the mixture, wherein the mixture comprising the first and second thermoplastic polymers has a percent crystallinity lower than the first thermoplastic polymer.
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