Process for the production of objects made of a rigid expanded material based on polyvinyl chloride, objects obtained by said process, and uses therefor
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United States of America Patent
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Sep 4, 1984
Grant Date -
N/A
app pub date -
Sep 13, 1982
filing date -
Sep 14, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A continuous process for making rigid PVC foam objects by extruding a preform from an initial PVC mixture, optionally cutting the preform into blanks, and expanding the preform or the blanks in water heated to a temperature above 70.degree. C. The initial mixture contains polyvinyl chloride, at least a first blowing agent capable of generating a gas, for example an isocyanate or a polyisocyanate, and at least one organic anhydride (and does not contain any added inert particles finely divided therein). The initial mixture may also contain less than one weight percent of a second blowing agent, for example azobisisobutyronitrile or azodicarbonamide. The objects produced possess heat- and sound-insulating properties.
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