Non-chalking blowing agent for foamed polymers

Details Non-chalking blowing agent for foamed polymers Non-chalking blowing agent for foamed polymers

1991-12-22

1992-07-07

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG83, 521 85, 521143, 521144, 521146, 521147, 521148, 521180, C08J 906

Patent

active

051280795

ABSTRACT:
A method of making a foamed polymer article by injection molding, using a foaming agent that does not form byproducts which could pit or chalk the polymer surface. The foaming agent contains sodium borohydride in an amount from 0.01 to 5.0 weight percent of the polymer, and sodium dihydrogen phosphate as an activator to react with the sodium borohydride and produce hydrogen gas. The sodium borohydride and the sodium dihydrogen phosphate are kept separated from direct contact with each other, such as by encapsulating the components, until gas production is desired when the polymer is heated.

REFERENCES:
patent: 4431752 (1984-02-01), Oswitch

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