초록 ▼

A method of preparing fiber reinforced acrylic thickened compositions which can be molded under low pressures and temperatures to provide thermoset articles, wherein liquid reactive components are slowly absorbed in high molecular weight solid acrylic resin in the form of large particles. The acryli

A method of preparing fiber reinforced acrylic thickened compositions which can be molded under low pressures and temperatures to provide thermoset articles, wherein liquid reactive components are slowly absorbed in high molecular weight solid acrylic resin in the form of large particles. The acrylic resin functions as a thickener which delays the viscosity build allowing fiber reinforcement to be incorporated before molding. The molding composition is well suited for use in dentistry and other fields where small amounts or molding composition are used occasionally.

대표청구항 ▼

1. A composition which comprises:a) a liquid monomer, liquid oligomer, liquid polymer or combination thereof with vinyl unsaturation, which polymerizes in the presence of an activated free-radical polymerization initiator; b) 35-70 wt. % based on the total weight of the liquid monomer, liquid oligom

1. A composition which comprises:a) a liquid monomer, liquid oligomer, liquid polymer or combination thereof with vinyl unsaturation, which polymerizes in the presence of an activated free-radical polymerization initiator; b) 35-70 wt. % based on the total weight of the liquid monomer, liquid oligomer, liquid polymer or combination thereof in the composition, of a solid acrylic resin which is soluble in said liquid monomer, liquid oligomer, liquid polymer or combination thereof containing vinyl unsaturation, having an average particle size in the range of 0.005 mm to 0.5 mm with at least a portion of said liquid monomer, liquid oligomer, liquid polymer or combination thereof containing vinyl unsaturation, absorbed therein, which is free of active free-radical polymerization initiators and which reacts with the liquid monomer, liquid oligomer, liquid polymer or combination thereof containing vinyl unsaturation, absorbed therein in the presence of an activated free-radical polymerization initiator; c) at least 10 wt. % based on the total weight of the composition, of long fiber reinforcement having an aspect ration (L/D) greater than 5:1 and an average length of at least 0.25 mm which is insoluble in the solid acrylic resin; and d) a free-radical polymerization initiator, the activity of which can be restrained under ambient conditions or is inactive at ambient temperature so as to provide a shelf life of at least one month at ambient temperature wherein said solid acrylic resin has absorbed said liquid monomer, liquid oligomer, liquid polymer or combination thereof for a period of maturation of at least one day to form a moldable dough.