Chemical blowing agent compositions

Details Chemical blowing agent compositions Chemical blowing agent compositions

1986-09-18

1988-09-06

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 455, 264 54, 264DIG5, 264DIG14, 264DIG83, 521 92, 521 97, 521 76, 521143, 521146, C08J 906, C08J 907

Patent

active

047693975

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. 1982.
"Hydrocerol--A Chemical Blowing Agent"--Product Literature, author and date unknown.
"Hydrocerol, Hydrocerol-Compound, Hydrocerol-CLM70"--Product Literature--Boehringer Ingelheim, author and data unknown.
Plastics Engineering Handbook--4th Ed.--Ed. by Joel Frades, 1976, p. 847.
"Process Stream Purification with Sodium Borohydride--Technical Manual and User's Guide--Morton Thiokol, Inc., Ventron Division, author and date unknown.
"Production of Foamed Thermo-plastics with Hydrocerol CF"--Product Literature--Boehringer Ingelheim, author and date unknown.
"Production of Foamed Thermo-plastics with Hydrocerol-Compound and Hydrocerol Batches"--Product Literature--Boehringer Ingelheim, author and date unknown.

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