Production of foam boards of high compressive strength from styrene polymers
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United States of America Patent
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Sep 26, 1995
Grant Date -
N/A
app pub date -
Nov 22, 1994
filing date -
Jun 4, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process for the production of foam boards having a minimum thickness of 20 mm and a cross-sectional area of at least 50 cm.sup.2 by extruding a mixture of the styrene polymer, from 1 to 10% by weight, based on the styrene polymer, of a blowing agent, wherein the blowing agent contains at least one ether from the group consisting of dimethyl ether, methyl ethyl ether and methyl vinyl ether.
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