Abstract: The invention relates to a resin composition containing low-molecular compounds which form a polyester urethane hybrid network. The resin composition contains a first component consisting of a condensation product of at least one diol and at least one unsaturated dicarboxylic acid material, a second component containing an ethylenically unsaturated monomer capable of copolymerizing with the first component, and a third component consisting of a polyisocyanate. The first component substantially consists of a diester compound of 2 diol molecules and 1 molecule of a dicarboxylic acid material, which dicarboxylic acid material consists of at least 75% of .alpha.-, .beta.-unsaturated dicarboxylic acid.

Abstract: The present invention relates to a process for the manufacture of a cast, injection moulded or compression moulded articles by curing a resin composition in a desired shape using catalysts, and allowing the shaped piece to post-cure under such conditions that an HDT of at least 150.degree. C. is obtained. The resin composition comprises a polyisocyanate, an ethylenically unsaturated monomer and a vinyl ester compound, and the vinyl ester compound contains on average about two to about 6 (meth)acrylate groups and on average about two to about 6 hydroxyl groups, and has a molecular weight higher than 300. The invention also relates to a resin composition suitable for use in the process.