Toughened Phenolic Foam
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United States of America Patent
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Issued Date -
Nov 15, 2007
app pub date -
Dec 22, 2005
filing date -
Dec 23, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A phenolic closed-cell foam includes polyvinyl pyrrolidone with a molecular weight of from 5,000 to 80,000 as a toughening agent. The polyvinyl pyrrolidone is present in the mixture (excluding blowing agent) in an amount of from 4% to 20% by weight. The foam cells are substantially free of holes or surface defects. The foam has superior fire performance.
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