Light reflective sheet and light reflector using it

Abstract

A light reflective sheet is here disclosed which comprises a porous resin sheet and a protective layer laminated on at least one surface of the porous resin sheet; the porous resin sheet comprises a polyolefin resin and 100 to 300 parts by weight of a finely powdery inorganic filler with respect to 100 parts by weight of a polyolefin resin; the porous resin sheet is stretched at an area stretch magnification of 1.5 to 20 times; the light reflectance of the porous resin sheet at a wave length of 550 nm is 95% or more; and the stiffness of the light reflective sheet is at least 50 mm. A light reflector using the light reflective sheet is also disclosed. Preferably, the protective layer has a function as a UV light protective layer and/or a light leakage preventing auxiliary layer. The light reflective sheet is excellent in light resistant to ultraviolet light and the like, structure holding properties and light reflectivity, and so it is useful as a light reflective sheet for back light units of liquid crystal displays of word processors, personal computers, televisions and the like as well as lights, copying machines, projector system displays, facsimiles, electronic blackboards and the like.

Dependencies are inferred from the claim text.