| 摘要 |
PURPOSE:To obtain a highly accurate colored sheet capable of being made large-sized and a light guide plate using the same by forming a multilayer structure wherein a colored acrylic resin layer is strongly bonded to at least one surface of a transparent acrylic resin base material layer by co-extrusion using a plurality of extruders. CONSTITUTION:A light pervious colored acrylic resin laminated sheet wherein a surface layer part is formed so that the thickness of a colored acrylic resin layer is 0.01mm or more and becomes 40% or less the whole thickness of a multilayer sheet 1 is obtained by a co-extrusion method wherein a transparent acrylic resin and a colored acrylic resin are respectively extruded from separate extruders to be formed into a laminated structure in a die part. This sheet 1 can be used as a light guide plate 1 propagating the light incident from the side surface of an edge light type surface light emitting system. In this case, as the transparent acrylic resin, one wherein 20wt.% or less of alkyl acrylate having a 1-4C alkyl group is copolymerized is pref. The colored acrylic resin layer can be obtained by compounding one kind or several kinds of an org. dye of a phthalocyanine type, a perinone type, an azo type or an anthraquinone type or inorg. pigment such as titanium yellow with the acrylic resin. |
