Foaming agent with alcohol activator and method for producing no

Details Foaming agent with alcohol activator and method for producing no Foaming agent with alcohol activator and method for producing no

1991-11-22

1993-01-26

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG83, 521 841, 521 85, 521 88, 521143, 521144, 521146, 521147, 521180, C08J 906

Patent

active

051820587

ABSTRACT:
A method of making a foamed polymer article by injection molding, using a foaming agent that evolves minimal water and does not form byproducts which could pit or chalk the polymer surface. The foaming agent contains sodium borohydride in an amount from 0.01 weight percent of the polymer to be foamed, and a polyhydric alcohol such as six-carbon mannitor as an activator to react with the sodium borohydride and produce hydrogen gas. Boric acid can be included with the alcohol. the sodium borohydride is kept separated from the other reactive components such as by encapsulation until gas production is desired when the polymer is heated and molded.

REFERENCES:
patent: 3331790 (1967-07-01), Scheurlen et al.
patent: 4394458 (1983-07-01), Wade
patent: 4397948 (1983-08-01), Wade

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