Patent ID: 6103779
Filing Date: 2000-08-15
Classification: A61C,A61K,C08F,C08L

Abstract:
A method of preparing a shelf-stable molding composition which comprises:a) mixing a solid acrylic resin, which is free of active free-radical polymerization initiators, with(i) one or more liquid monomers, liquid oligomers, liquid polymers or a combination thereof with vinyl unsaturation, which polymerizes in the presence of an activated free-radical polymerization initiator, wherein said solid acrylic resin absorbs said liquid monomers, liquid oligomers, liquid polymers and combinations thereof, and reacts with said liquid monomers, liquid oligomers, liquid polymers and combinations thereof, in the presence of an activated free-radical polymerization initiator; and(ii) long fiber reinforcement having an aspect ratio L/D greater than 5:1, which is insoluble in said solid acrylic resin; andb) aging the mixture of solid acrylic resin, and liquid monomers, liquid oligomers, liquid polymers or combinations thereof, and long fiber reinforcement for at least 24 hours to allow absorption of the liquid monomer, liquid oligomer, liquid polymer or combination thereof containing vinyl unsaturation, by the solid acrylic resin.