Patent ID: 8609767

Claim:
A toughened thermosetting resin, consisting of: a thermosetting resin and fully vulcanized powdery carboxylated nitrile rubber particles dispersed therein in an average particle size in the range of 30 to 200 nm and having a homogeneous structure and a gel content of 75 percent by weight or more, wherein said rubber particles are fully vulcanized powdery rubbers prepared by a process comprising providing a rubber latex, optionally adding a cross-linking agent into the rubber latex, then applying irradiation to the rubber latex to form a cross-linked rubber latex and then drying the cross-linked rubber latex, and wherein said ratio of the total weight of said rubber particles to the total weight of said thermosetting resins is about 1:100 to about 30:100, wherein the Izod impact strength of the toughened thermosetting resin is increased in comparison with the thermosetting resin without said rubber particles, wherein said thermosetting resin is epoxy resins, and wherein a thermal distortion temperature of said toughened thermosetting resin is decreased 4.33% or less, or is increased, in comparison with a thermosetting resin without said rubber particles.