Low-pressure low-temperature in-mold coating method

Details Low-pressure low-temperature in-mold coating method Low-pressure low-temperature in-mold coating method

B - Operations, Transporting

29

C

18/911

B29C 43/20 (2006.01) B29C 37/00 (2006.01) C08G 18/68 (2006.01)

Patent

CA 1141126

ABSTRACT OF THE DISCLOSURE A method comprises in-mold coating on a molded thermoset polyester glass fiber substrate an in-mold coating compo- sition 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 compo- sition 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.

343210

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