The Goodyear & Tire Rubber Company

Richard E Fruzzetti

Michael E Kimball

James D Wolfe

Polyurethane can be made having improved heat stability, sufficient to withstand paint oven temperatures by mixing or dispersing about 0.5 to 10 parts or more of an organic monosulfide or disulfides, preferably where the organo radical is a hydroxyl phenyl or hydroxyl alkyl substituted phenyl radical per 100 parts of the polyurethane reactants and reacting to form the polyurethane.

Stabilizing urethanes with antioxidants

A one component polyurethane precursor suitable as an in-mold coating composition composed of a prepolymer of an organic polyisocyanate with a polyol of a polyether polyol of 2 and 3 hydroxyl groups or a polyester polyol of 2 and 3 hydroxyl groups to give a free NCO content of about 3 to about 15% with a salt complex of a diamine, such as NaCl complex of MDA. The amount of filler and plasticizer, viz, those preferably of the crown or pseudocrown ethers preferably are adjusted to give the precursors a viscosity of about 5 to about 50 pascal seconds at the temperature the precursors are applied, but usually less than about 80.degree. C. These precursors are spread, applied or preferably injected onto the surface of the fiberglass molding viz a polyester or epoxy resin one and pressed at a pressure of about 5 to 200 psi (34,475 to 1,379,000 pascals) and higher at a temperature of at least 80.degree. C. to cure the precursor to give a polyurethane coating on the fiberglass molding.

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Wadsworth, OH, United States of America

Richard E Fruzzetti