| abstract |
This invention pertains to a pigmentable, low-shrink molding composition based on thermosetting, unsaturated polyester resin in combination with lightly cross-linked polymer particles. The lightly cross-linked polymer particles have a particle size preferably between about 20 microns to 50 microns and can be selected from lightly cross-linked condensation polymers and lightly cross-linked addition polymers. In a preferred aspect of the invention the lightly cross-linked polymer particles contain minor amounts of pendant reactive groups selected from amino and oxirane groups to produce a one-pack stabilized low-shrink molding resin mixture. The pigmentable, low-shrink molding compositions are stabilized dispersions containing pigments dispersed therein in conjunction with thermosetting polyester polymer, monomer, and lightly cross-linked polymer particles as well as fillers to provide a pigmentable low-shrink molding composition which cures to uniformly pigmented low-profiled molded part. |