US Patent 7294388 - Resin and nanoparticle lubrication material

http://www.freepatentsonline.com/7294388.html

This patent focuses on the use of silica nanoparticles in high coefficient of friction materials for continuous torque transmission systems which can withstand high speeds and have high heat resistance. Claim 1 reads:

1. An oil lubricated friction material for use in a clutch or brake comprising a first layer comprising a fibrous base material and at least one resin material, and a second layer comprising nanoparticle-sized friction modifying particles on a top surface of the base material, the second layer of the nanoparticle-sized friction modifying particles having a thickness of about 10 nm to about 250 .mu.m, wherein the nanoparticle-sized friction modifying particles have an average diameter size from 10 nm to 150 nm, and wherein the nanoparticle layer covers 3 to 99%, by area, of the base material.