Process for producing expanded particles of styrene-acrylonitril

Details Process for producing expanded particles of styrene-acrylonitril Process for producing expanded particles of styrene-acrylonitril

1987-08-18

1989-03-14

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 59, 521139, 521140, C08J 918, C08J 922

Patent

active

048124842

ABSTRACT:
A process for producing expanded particles of a styrene-acrylonitrile-butadiene copolymer is disclosed, comprising dispersing styrene-acrylonitride-butadiene copolymer particles in water in a closed vessel, feeding a volatile blowing agent to the aqueous dispersion in the closed vessel, heating the aqueous dispersion to a temperature higher than a glass transition point of the copolymer particles by at least 20.degree. C. to impregnate the volatile blowing agent into the copolymer particles, and opening one end of the closed vessel to release the aqueous dispersion containing the expandable copolymer particles into a low pressure zone having a pressure lower than the inner pressure of the closed vessel. The resulting expanded particles have a degree of expansion of from 10 to 50.

REFERENCES:
patent: 4524154 (1985-06-01), Maeda et al.
patent: 4525485 (1985-06-01), Maeda et al.
patent: 4602047 (1986-07-01), Endo
patent: 4689351 (1987-08-01), Endo

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