Patent ID: 8871853

Claim:
A resin system comprising a resin component and surface-modified nanoparticles dispersed in the resin component, wherein the surface-modified nanoparticles have a multimodal particle size distribution comprising a first mode having an average particle size of D1, wherein D1 is between 50 nanometers and 250 nanometers, inclusive, and a number of nanoparticles in the first mode, N1, and a second mode having an average particle size, D2, wherein D2 is between 20 and 50 nm, inclusive, and a number of nanoparticles in the second mode, N2; wherein the ratio of D1 over D2 is between 1.5 and 5.0, and the ratio of N2 over N1 is between 1 and 2, inclusive; wherein the average particle size and number of nanoparticles in a mode are measured according to the Transmission Electron Microscopy Procedure.