Closed cell polymer foam
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United States of America Patent
Stats
-
May 7, 2002
Grant Date -
N/A
app pub date -
Oct 1, 1999
filing date -
Jan 22, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A closed-cell polymer foam having a density of less than 100 kg.m.sup.-3 is described. The cells in the foam contain a foam blowing agent comprising (a) a blend of two or more hydrofluorocarbons, (b) a blend comprising a carbon dioxide and one or more hydrofluorocarbons or (c) a blend comprising dimethyl ether and one or more hydrofluorocarbons, and the polymer is a blend comprising at least 50% by weight of an olefinic polymer(s) and up to 50% by weight of a polar polymer(s) having a lower molecular weight than the olefinic polymer which when in the heat plasticised state is able to dissolve the foam blowing agent. A process for preparing the foam is also described.
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