Gm Global Technolgoy Operations, Inc.

Robert James Hoye

Suresh Deepchand Shah

Kaneyoshi Ashida

Jayprakash Uttamchand Raisoni

Venkatasubramanian Laxmanan

Chin-Jui Chang

Vabilisetti S Murty

High strength to weight ratio, improved dimensional and surface quality hollow metal moldings are formed by injecting thixotropic, semi-solid metal billets as a 'short shot' into a mold cavity; introducing an inert gas into the charge under pressure to force the metal into full and faithful contact with cavity surfaces and to form a hollow portion in the molding; maintaining the pressure of the gas on the charge in the cavity until the metal has solidified and then venting the gas for molded product removal.

Gas-assisted molding of thixotropic semi-solid metal alloy

This invention generally relates to a high resilience urethane foam (HR foam) having low compression set at a wide range of isocyanate index for use in small void filling in integrated foam parts. The small voids formed in the molding process of integrated foam parts can be filled without penetration of foaming liquids into existing foam cells. In addition, resulting foams have very low compression set values at a wide range of isocyanate index. The foaming system of the present invention is composed of two components, i.e., thixotropic polyisocyanate component and thixotropic polyol component. Their thixotropicity is obtained by adding benzal sorbitol into respective components. The polyisocyanate is selected from organic polyisocyanates and the polyol component is prepared by mixing a polyol blend composed of a polyolefinic polyol and a polyoxyalkylene polyol in a weight ratio between 95/5 to 50/50, a blowing agent, a surfactant and a catalyst.

Method of making low compression set urethane foams

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Trenton, MI, United States of America

Robert James Hoye