| 摘要 |
<p>Provided is a multi-layer light diffusion plate for a back light system of a liquid crystal display device, which causes little deterioration under UV rays emitted from fluorescence lamps. The multi-layer light diffusion plate comprises: a light diffusion layer formed of at least one transparent resin selected from the group consisting of a styrene-methyl methacrylate copolymer and a styrene polymer and containing a light diffusing agent dispersed therein; and a UV absorbing layer formed of a styrene-methyl methacrylate copolymer containing 0.05-10 parts by weight of at least one UV absorber selected from the group consisting of a UV absorber represented by a formula 1 and a UV absorber represented by a formula 2, based on 100 parts by weight of the styrene-methyl methacrylate copolymer. In the formula 1, R^1 represents a C10 or lower alkyl, and each of R^2 and R^3 represents H, t-butyl, t-octyl or phenyl. In the formula 2, R^4 represents methyl, t-octyl or a substituent represented by a formula 2-1, and R^5 represents t-octyl or a substituent represented by a formula 2-1, 2-2 or 2-3. In a formula 2-3, R^6 represents t-octyl or a substituent represented by the formula 2-1.</p> |
