Wednesday, January 24, 2007

US Patent 7166663 - Nanoparticle/Microparticle Composition

Hardness and scratch resistance of materials may be improved by adding particulate matter. However, for optically transparent materials such particle additives may cause undesired haze and lack of clarity. This patent from Nanophase proposes an optimized mixture of nanoparticles and microparticles to balance the physical and optical benefits of particulate enhanced materials. Claim 1 reads:

1. A composition comprising: a matrix material; a first particulate fraction comprising an average particle size of from about 1 nanometer to 100 nanometers; and a second particulate fraction comprising an average particle size from about 0.25 microns to about 50 microns, wherein the first particulate fraction is present in an amount between about 35 to about 65 weight percent of the total added particulate fraction.

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