US Patent 7598315 - Aqueous dispersion of nanoparticle/polyurethane composites

http://www.freepatentsonline.com/7598315.html

This patent from Lubrizol Advanced Materials teaches a process for manufacturing nanoparticle polymer composites. Claim 1 reads:

1. A process for making an aqueous dispersion of nanoparticle/polyurethane composites, the process comprising:

forming a mixture of nanoparticles and a continuous mass of a polyurethane prepolymer in the substantial absence of water, and

dispersing the mixture in aqueous medium.