Method of making a foam injection molded article
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United States of America Patent
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-
Feb 21, 1989
Issued Date -
N/A
app pub date -
Jun 15, 1988
filing date -
Sep 18, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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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