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

1988-11-15

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 264143, 521 56, 521 60, 521 79, 521145, C08J 922

Patent

active

047850230

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:
patent: 4360602 (1982-11-01), Nehmey et al.
patent: 4370286 (1983-01-01), Nehmey et al.
patent: 4413065 (1983-11-01), Hall et al.
patent: 4613626 (1986-09-01), Sakata et al.
patent: 4675345 (1987-06-01), Pecsok
patent: 4687641 (1987-08-01), Maeda et al.

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