Polyester resin compositions and use of the compositions.

摘要

This invention involves a curable liquid mixture comprising (a) a polyester of the following formula: (I) wherein n has an average value between about 1.5 and about 2, m is 2-n, R is the hydroxyl-free residue of a predominantly hydroxyl terminated polyester obtained by the condensation of a diol selected from the class consisting of 1,2-propylene glycol, 1,3-butanediol, 2,2-dimethyl-1,3-propanediol, dipropylene glycol, diethylene glycol, 2,2-dimethyl-3-hydroxypropyl, 2,2-dimethyl-3-hydroxypropionate, the ethylene and propylene oxide derivatives of 2,2-bis-(4-hydroxyphenyl)propane, and mixtures thereof, and mixtures of ethylene glycol and said diols, with a dicarboxylic acid or anhydride selected from the class consisting of maleic acid and anhydride, fumaric acid, ortho-phthalic acid and anhydride, isophthalic acid, terephthalic acid, carbic acid and anhydride, and mixtures thereof, (b) maleic anhydride and (c) an ethylenically unsaturated monomer which forms a homogeneous mixture with and is copolymerizable with (a) and (b), and wherein the molar ratio of polymerizable double bonds in (c) as compared to those in (a) plus (b) is between about 1 and about 3.6. These compositions have fast cure speeds and afford fiber reinforced composites with high stiffness and strength.