| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight light guide plate having low moisture absorption, high strength and high transparency. SOLUTION: The light guide plate is made of a styrene (meth)acrylate copolymer resin which is a styrene (meth)acrylate copolymer consisting of styrene monomers, (meth)acrylate monomers and vinyl monomers copolymerizable with these monomers. In the copolymer, the proportions of the styrene monomers and the (meth)acrylate monomers are 80 to 20 mass% of the styrene monomers and 20 to 80 mass% (meth)acrylate monomers, the weight average molecular weight (Mw) of the styrene (meth)acrylate copolymer ranges from 60,000 to 170,000, the amount of the residual monomers in the styrene (meth)acrylate copolymer is <=3,000 ppm, and the amount of oligomers is <=2 mass%.
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