Process for the production of objects made of a rigid expanded m

Details Process for the production of objects made of a rigid expanded m Process for the production of objects made of a rigid expanded m

1982-09-13

1984-09-04

Anderson, Philip E.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

47DIG10, 264 54, 264DIG3, 521 82, 521 94, 521134, B29D 2700

Patent

active

044698194

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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patent: 3283043 (1966-11-01), Landler et al.
patent: 3713253 (1973-01-01), Urban
patent: 4293511 (1981-10-01), Vernon
patent: 4333780 (1982-06-01), Allada

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