Light refection sheet, process for producing the same and molding thereof

摘要

The light reflection sheet (I) of the present invention comprises a sheet having a thickness of 0.4 to 2 mm and comprising a polycarbonate resin composition containing (B) titanium oxide, and the sheet has a light reflectance of 98% or more and a light transmittance of less than 1%. It is excellent in a flame retardancy and a reflection characteristic. Also, the light reflection sheet (II) of the present invention is prepared by providing a light-fast layer which cuts or absorbs a UV ray in a thickness of 0.5 to 20 mum on at least one face of a base sheet having a thickness of 0.4 to 2 mm and comprising a PC resin composition containing a combination of 85 to 60 mass % of (A) a PC base polymer and 15 to 40 mass % of (B) titanium oxide. It is less yellowed and less reduced in a reflection characteristic even after used for a long period of time. Further, the light reflection sheet (III) of the present invention is prepared by providing a light diffusion layer which diffuses and reflects light in a thickness of 0.5 to 20 mum on at least one face of the same base sheet as in the light reflection sheet (II). It is improved in a light diffusing and reflecting property and can form a liquid crystal image plane having less luminance unevenness when it is used as a direct under type liquid crystal back light.