Crosslinked polymer particles with an epoxy resin, an epoxy resin composition and a cured epoxy resin

The present invention discloses a crosslinked polymer particles with an epoxy resin, the epoxy resin containing (meth) acrylate monomer units and crosslinkable monomer units with crosslinked polymer particles having a volume average primary particle size is 0.5μm ~ 10μm, monomer components other than the crosslinkable monomer according glass transition temperature obtained by the FOX equation above 30 ℃, refractive index at 23 ℃ of 1.490 ~ 1.510; in addition, also disclosed comprising this crosslinked polymer particles, the epoxy resin composition an epoxy resin and a curing agent, and such resin composition is cured to give a cured epoxy resin having colorless transparency and crack resistance.