Patent ID: 6235228
Filing Date: 2001-05-22
Classification: B29C,B29K,Y10T

Abstract:
A method for on-mold coating a molded article in an open plastic mold, comprising:a) providing a thermosetting unsaturated polyester coating powder composition which consists essentially of an unsaturated polyester resin containing active hydrogen atoms and having a melt viscosity at 175.degree. C. of between 3,750 and 4,750 centipoise, a copolymerizable cross-linking prepolymer, and a thermal initiator, with the proviso that the composition is essentially free of a copolymerizable cross-linking monomer;b) applying said coating powder composition, which becomes the outer skin of the molded article, onto a shape-imparting mold surface;c) heating said powder coated mold surface to a temperature sufficient to flow and coalesce the coating powder into a substantially continuous coating film and effect cure, with the temperature being below the mold deformation temperature;d) applying a fill resin, which constitutes the bulk of the molded article, onto said cured powder coating and allowing the cure of the fill resin to advance sufficiently until said powder coating film and fill resin are integral; and,e) releasing said finished coated article from said mold.