Gm Global Technolgoy Operations, Inc.

Stanley A Iobst

Chen-Shih Wang

Choongyong Kwag

Ismat Ali Abu-Isa

Howard W Cox

Roger J Eldred

One embodiment of the invention provides a method for compression molding cosmetic panels with visible carbon fiber weaves using clear or lightly filled resins. The method uses a modified, two-step compression molding process to reflow the surface of a partially cured preform of carbon fiber weave and epoxy resin.

Method for molding cosmetic composite panels with visible carbon fiber weaves

According to a preferred practice of the invention, thermoset polyurethanes are molded from a mixture of solid particles of hydroquinone di-(beta-hydroxyethyl)ether (HQEE) and zinc stearate dispersed in a liquid mixture of a polyether polyol and a liquid form of diphenylmethane diisocyanate. The use of the HQEE chain extender and the zinc stearate catalyst provides a unique one-shot molding mixture that is relatively unreactive at room temperature, but polymerizes and cures rapidly upon heating. It has a pot life of at least several hours and is suitable for use in injection molding equipment generally used in processing thermoplastic material.

Catalyzed one-shot system for molding thermoset polyurethanes

In an exemplary embodiment a high temperature and oil resistant elastomer composition includes the peroxide-induced reaction product of, by weight, 100 parts ethylene-propylene-diene rubber, about 20 parts of a suitable crosslinking monomer, about 8 parts of a chlorinated organic material such as Chlorowax LV, about 10 parts of a suitable hindered phenolic antioxidant 10 to 15 parts zinc oxide and 5 to 8 parts magnesium oxide. The elastomer formulation may optionally contain suitable reinforcing and/or semireinforcing fillers and processing oils. A similar ethylene-propylene rubber formulation may be prepared. The resulting elastomer formulations have remarkable oil resistance and retain a significant elongation even after aging at 177.degree. C. (350.degree. F.) for 168 hours.

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Troy, MI, United States of America

Stanley A Iobst