Robert A Lapierre

US Patent:

47693975, Sep 6, 1988

Filed:

Sep 18, 1986

Appl. No.:

6/908625

Inventors:

Robert M. Lapierre - Sterling MA
Nicholas J. Leonardi - North Andover MA

Assignee:

Enron Chemical Company - Rolling Meadows IL

International Classification:

C08J 906
C08J 907

US Classification:

521 85

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.

US Patent:

48062944, Feb 21, 1989

Filed:

Jun 15, 1988

Appl. No.:

7/207125

Inventors:

Robert M. Lapierre - Sterling MA
Nicholas J. Leonardi - North Andover MA

Assignee:

Enron Chemical Company - Cincinnati OH

International Classification:

C08J 906
C08J 908

US Classification:

264 54

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.