Patent ID: 8435629

Claim:
A composite material comprising: (a) a first prepreg material with improved resistance to microbuckling and kinkband formation comprising a first epoxy resin, reinforcing fibers oriented in a °0 reference direction, and insoluble or partially soluble polymer particles; and (b) a second prepreg material with improved resistance to delamination arranged adjacent to the first prepreg material, said second prepreg material comprising a plurality of prepreg plies and at least one of: (i) insoluble or partially soluble interlaminar polymer particles between prepreg plies of the second prepreg material; and (ii) one or more strengthening interleafs between prepreg plies of the second prepreg material, wherein each prepreg ply of the second prepreg material comprises a second epoxy resin and reinforcing fibers oriented in a second direction that forms an angle relative to the 0° reference direction, and wherein the first epoxy resin has an elastic modulus that is higher than the elastic modulus of the second epoxy resin.