Pellets of chlorinated vinyl chloride resin composition, pre-exp

Details Pellets of chlorinated vinyl chloride resin composition, pre-exp Pellets of chlorinated vinyl chloride resin composition, pre-exp

1988-01-27

1988-09-20

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521 58, 521 79, 521145, 264 53, 264143, C08J 918

Patent

active

047726377

ABSTRACT:
Pellets of a chlorinated vinyl chloride resin composition comprising inorganic materials, a solvent and a blowing agent; a pre-expanded particle of a chlorinated vinyl chloride resin comprising inorganic materials and a solvent and a process for preparing the pre-expanded particle of the chlorinated vinyl chloride resin containing inorganic materials which comprises kneading a chlorinated vinyl chloride resin, inorganic materials and a solvent, pelletizing the kneaded mixture, impregnating a physical blowing agent into the resulting pellets and pre-expanding the pellets. The present invention makes it possible to be contained a large amount of inorganic materials in a chlorinated vinyl chloride resin by forming a uniform gel phase of the chlorinated vinyl chloride resin and the solvent and wrapping inorganic materials in the gel phase. A foamed article produced by employing pre-expanded particles of the chlorinated vinyl chloride resin containing inorganic materials has an excellent heat resistance, i.e. the foamed article generates little heat, produces little smoke and little poison gas and is hardly strained and cracked at burning, and further, has a large dimensional stability.

REFERENCES:
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patent: 4413065 (1983-11-01), Hall et al.
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patent: 4675345 (1987-06-01), Pecsok
patent: 4687641 (1987-08-01), Maeda et al.
Japanese Examined Patent Pub. No. 26776/1977, published Jul. 15, 1977.
Japanese Examined Patent Pub. No. 7944/1978, published Mar. 23, 1978.
Japanese Unexamined Patent Pub. No. 217661/1984, published Dec. 7, 1984.
Japanese Unexamined Patent Pub. No. 215331/1984, published Dec. 5, 1984.

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