Maturation of polyester compositions for viscosity index control

Claim 1

A maturated moldable thermosetting resin-containing composition for molding under pressure having a filler selected from the group consisting of (a) reinforcing fiber, (b) inert filler, and (c) a combination of both (a) and (b), dispersed therein, in which the curable resin binder consists essentially of the reaction product, in intimate contact with said filler, of A. an unsaturated polyester resin having (1) a ratio of hydroxyl groups to carboxyl groups between about 5.7 and 0.8 and (2) an acid number of at least 14 and (3) an average molecular weight between about 800 and 5,000, and B. (1) an organic polyisocyanate in an amount sufficient to react with at least thirty percent but not more than one hundred five percent of the hydroxyl groups present, and B. (2) a metallic oxide or hydroxide selected from the group consisting of calcium and magnesium oxides and hydroxides in an amount sufficient to react with at least thirty percent but not more than seventy-five percent of the carboxyl groups present, said reaction product containing dispersed therein C. an aliphatically-unsaturated monomer, D. a free radical polymerization catalyst, and E. an internal mold release agent, said binder comprising at least about eight weight percent of said composition.

Claim 23

The method of producing a controllable rise in viscosity and an improved viscosity index as herein defined of an uncured polyester compound, said compound comprising: (A) an unsaturated polyester resin have (1) a ratio of hydroxyl groups to carboxyl groups between about 5.7 and 0.8 and (2) an acid number of at least 14 and (3) an average molecular weight between about 800 and 5,000; at least one (C) aliphatically-unsaturated monomer; and (D) a free radical polymerization catalyst, comprising the step of introducing into said polyester resin compound reaction mixture prior to curing (B)(1) an organic polyisocyanate in an amount sufficient to react with at least thirty percent but not more than one hundred five percent of the hydroxyl groups present, and (B)(2) a metallic oxide or hydroxide selected from the group consisting of calcium and magnesium oxides and hydroxides in an amount sufficient to react with at least thirty percent but not more than seventy-five percent of the carboxyl groups present.

Claim 24

The method of producing a controllable rise in viscosity and an improved viscosity index as herein defined of an uncured polyester compound, said compound comprising: (A) an unsaturated polyester resin have (1) a ratio of hydroxyl groups to carboxyl groups between about 5.7 and 0.8 and (2) an acid number of at least 14 and (3) an average molecular weight between about 800 and 5,000; at least one (C) aliphatically-unsaturated monomer; and (D) a free radical polymerization catalyst, comprising the step of introducing into said polyester resin compound reaction mixture prior to curing (B)(1) an organic polyisocyanate in an amount sufficient to react with at least thirty percent but not more than one hundred five percent of the hydroxyl groups present, and (B)(2) a metallic oxide or hydroxide selected from the group consisting of calcium and magnesium oxides and hydroxides in an amount sufficient to react with at least thirty percent but not more than seventy-five percent of the carboxyl groups present.