Process for preparing rigid polyvinyl chloride stractured foams

Details Process for preparing rigid polyvinyl chloride stractured foams Process for preparing rigid polyvinyl chloride stractured foams

1989-03-06

1990-09-11

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 54, 521 79, 521 81, 521 92, 521 97, 521139, 521145, C08J 906

Patent

active

049563963

ABSTRACT:
A new rigid polyvinyl chloride foam is provided which has been improved with respect to the thickness of its non-foamed layer and the surface properties including its tensile strength and compressive strength. The foam can be produced preferably by mixing 3-10 parts per hundred of resin (per hundred resin) of dioctyl phthalate and 4-20 phr of an impact-resistance modifier such as a methyl methacrylate acid-butadiene-styrene copolymer with a composition of 100 phr of vinyl chloride resin, 5 phr of a processing aid, 2 phr of a heat stabilizer, 0.5 phr of a lubricant, 0.75 phr of a foaming agent and 0.75 phr of boric acid, and then extruding the resulting mixture from a single-screw extruder.

REFERENCES:
patent: 4042556 (1977-08-01), Yoshinaga
patent: 4427795 (1984-01-01), Dorrestijn et al.
patent: 4563482 (1986-01-01), Tanizawa et al.

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