One component polyurethane smc surface coat

Details One component polyurethane smc surface coat One component polyurethane smc surface coat

C - Chemistry, Metallurgy

08

L

400/102, 18/911

C08L 75/08 (2006.01) C08G 18/10 (2006.01) C08J 5/00 (2006.01)

Patent

CA 1253989

Abstract of the Disclosure A ONE COMPONENT POLYURETHANE SMC SURFACE COAT 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°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°C to cure the precursor to give a polyurethane coating on the fiberglass molding.

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