Patent ID: 8053518

Claim:
A two-pack polyester urethane hybrid resin casting resin composition comprising: a first constituent comprising a mixture ABCD of an unsaturated polyester ABC which has moieties derived from: (i) at least one alcohol A, (ii) a mixture of carboxylic acids B, wherein the alcohols A and carboxylic acids B form a resulting polyester AB having an acid number of at least 15 mg/g, and wherein at least 10% of the mass of at least one of the carboxylic acids B or of the alcohols A have at least one olefinic unsaturation in their molecules; and (iii) a monoepoxide C having at least four carbon atoms, which polyester ABC is dissolved in a compound D having at least one olefinic unsaturation and being radically copolymerisable with the unsaturated polyester ABC; and a second constituent comprising a liquid component EF comprising a polyfunctional isocyanate E and a radical initiator F.