Foamed article of chlorinated vinyl chloride resin containing in

Details Foamed article of chlorinated vinyl chloride resin containing in Foamed article of chlorinated vinyl chloride resin containing in

1988-11-30

1990-12-25

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 91, 521 92, 521145, C08J 900

Patent

active

049803832

ABSTRACT:
A foamed article of a chlorinated vinyl chloride resin containing an inorganic material, which contains an inorganic fibrous material in an amount of not less than 0.003 g per 1 cm.sup.3 of the article or inorganic particles in an amount of not less than 0.06 g per 1 cm.sup.3 of the article and which has dimensional retention of not less than 70% when the article is heated at 200.degree. C. for one hour and an expansion ratio of not less than 5 times, which is prepared by the process comprising the steps of (1) preparing a foamable composition by kneading a mixture comprising a chlorinated vinyl chloride resin, an inorganic material, a chemical blowing agent and a solvent, (2) filling a closable mold with the foamable composition, (3) heating the foamable composition under pressure in the mold to generate a gelled chlorinated vinyl chloride resin and to decompose said chemical blowing agent, (4) cooling the foamable composition in the mold to a temperature suitable for expansion, and (5) opening the mold to give a foamed article. The foamed article has excellent dimensional retention at high temperatures as well as excellent mechanical property and shows little calorie, smoke and poison gas.

REFERENCES:
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patent: 4345040 (1982-08-01), Hall
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patent: 4409165 (1983-10-01), Kim
patent: 4413065 (1983-11-01), Hall

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