초록 ▼

A method comprises in-mold coating on a molded thermoset polyester glass fiber substrate an in-mold coating composition at a pressure of from about 25 to 50 p.s.i. and at a temperature not in excess of about 150°F. for from about 2 to 12 minutes, said in-mold coating composition comprising the react

A method comprises in-mold coating on a molded thermoset polyester glass fiber substrate an in-mold coating composition at a pressure of from about 25 to 50 p.s.i. and at a temperature not in excess of about 150°F. for from about 2 to 12 minutes, said in-mold coating composition comprising the reaction product of an unsaturated aliphatic fumarate polyester diol, a saturated polyester diol flexibilizer, a cross-linking aliphatic polyol having from 3 to 6 OH groups, a diisocyanate in an amount by weight sufficient to provide from about 50 to 120%, preferably from about 80 to 103%, of the stoichiometric amount of －NCO groups required to react with all of the active hydrogen atoms in the coating composition and an ethylenically unsaturated monomer sufficient to polymerize with and crosslink the unsaturated polyester in admixture with a free radical peroxide initiator, an accelerator for said peroxide initiator and a polyurethane tin catalyst.

대표청구항 ▼

The method which comprises in-mold coating a molded thermoset polyester resin glass fiber composition containing from about 25 to 75% by weight of glass fibers with an in-mold coating composition and curing said in-mold coating composition at a pressure of from about 25 to 50 p.s.i. and at a tempera

The method which comprises in-mold coating a molded thermoset polyester resin glass fiber composition containing from about 25 to 75% by weight of glass fibers with an in-mold coating composition and curing said in-mold coating composition at a pressure of from about 25 to 50 p.s.i. and at a temperature of not above about 150°F. for from about 2 to 12 minutes, said in-mold coating composition comprising (a) an unsaturated aliphatic polyester diol having an average molecular weight of from about 1,500 to 4,500 and from about 8 to 30 internal aliphatic carbon-to-carbon double bonds, (b) a saturated aliphatic polyester diol flexibilizer having an average molecular weight of from about 1,500 to 3,000 (b) being present in a minor molar amount as compared to (a), (c) an aliphatic crosslinking polyol having from 3 to 6 hydroxyl groups and an average molecular weight of from about 92 to 1,000, (d) a diisocyanate selected from the group consisting of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′-diphenyl methane diisocyanate, 4,4′-dicyclohexyl methane diisocyanate, polymeric forms of TDI, MDI and hydrogenated MDI, xylene diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate and mixtures thereof, said diisocyanate being present in an amount by weight sufficient to provide from about 50 to 120% of the stoichiometric amount of －NCO groups required to react with all of the active hydrogen atoms in said coating composition, and (e) an ethylenically unsaturated monomer selected from the group consisting of styrene, alpha methyl styrene, vinyl toluene, methyl methacrylate, acrylamide, acrylonitrile, methyl acrylate and mixtures thereof, said monomer being present in an amount sufficient to copolymerize with and crosslink said unsaturated polyester, in admixture with (f) an organic free radical peroxide initiator in an amount of from about 2.5 to 5% by weight based on the weight of the unsaturated polyester and the unsaturated monomer, (g) an accelerator for said peroxide initiator selected from the group consisting of tertiary aromatic amines and cobalt salts of carboxylic acids in an amount not in excess of about 1.5% by weight based on the weight of the unsaturated polyester and the unsaturated monomer and (h) a polyurethane tin catalyst selected from the group consisting of organotin compounds and tin salts of carboxylic acids in an amount of from about 0.05 to 0.9 part by weight per 100 parts by weight total of the polyols.