PROBLEM TO BE SOLVED: To provide a (meth) acryl polymer composition which is a material enabling a light guiding preliminary molded product, which allows production of a light guiding for surface light source device having a light emission mechanism based on bubbles of a foamed surface layer etc. by laser irradiation processing, to be obtained by extrusion molding or injection molding, and which uses (meth) acryl polymer having a low mass average molecular weight.;SOLUTION: A material enabling a preliminary molded product of a light guiding 1 in which a foamed surface layer 14 is formed to be obtained, is composed of (meth) acryl polymer composition including 100 pts.mass of (meth) acryl polymer (A) having the mass average molecular weight of 60,000 or more and 150,000 or less, and 0.1 pts.mass or more of vinyl polymer (B) having the mass average molecular weight of 500,000 or more.;COPYRIGHT: (C)2015,JPO&INPIT
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