Method of making a foam injection molded article

Details Method of making a foam injection molded article Method of making a foam injection molded article

1988-06-15

1989-02-21

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG5, 264DIG83, 264337, 521 85, 521 92, 521 97, 521 76, 521143, 521146, C08J 906, C08J 908

Patent

active

048062944

ABSTRACT:
A method of making a foam injection molded article is disclosed wherein corrosion of the mold element is significantly reduced or substantially eliminated. The method comprises dispersing effective amounts of a primary chemical blowing agent of sodium borohydride and an activation system of sodium bicarbonate/citric acid mix into a polymer resin to form a mixture. The mixture is then heated whereby the activation system releases water and the sodium borohydride reacts with the water to produce hydrogen gas. The mixture is subsequently injected into a mold to obtain expansion of the polymer resin to form the foam article. The invention also comprehends a corresponding chemical blowing agent composition.

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Gribens and Rei:, "Sodium Borohydride--A Novel Blowing Agent For Structural Foams", Plastics Engineering, vol. 38, No. 3, Mar. 19.
"Hydrocerol--A Chemical Blowing Agent"--Product Literature, author and date unknown.
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