Sunday, February 08, 2009

US Patent 7486442 - Nanoparticle composite polarizer protective film

Polarizing plates are useful for displays such as LCDs. This patent from Industrial Technology Research Institute teaches using nanoparticles to form polarizing plates with enhanced resistance to moisture permeability. Claim 1 reads:

1. A polarizer protective film, comprising:

a transparent resin; and

about 5-50% by weight of nanoscale particles dispersed in the transparent resin,

wherein the nanoscale particles are formed of a single material and have an average diameter not exceeding 50 nanometers, wherein the combination of the transparent resin and the nanoscale particles exhibits an optical retardation value of less than 5 nm, and wherein the polarizer protective film is formed of a single layer and directly touches a polarizer.