Patent ID: 7767757

Claim:
Thermoset material with improved impact resistance comprising, by weight: 95 to 85% of a thermoset resin, 5 to 15% of an impact modifier comprising at least one copolymer chosen from copolymers comprising A-B-C and A-B blocks, in which: each block is connected to the other by means of a covalent bond or of an intermediate molecule connected to one of the blocks via a covalent bond and to the other block via another covalent bond, A is a copolymer of methyl methacrylate (MMA) and dimethylacrylamide (DMA), C is either (i) a polymethyl methacrylate (PMMA) (homopolymer or a copolymer) this PMMA comprising optionally a water-soluble monomer or (ii) a polymer based on vinyl monomers or mixture of vinyl monomers, B is incompatible or partially compatible with the thermoset resin and incompatible with the A block and the optional C block and the Tg of B is less than 0° C.