Light-guiding plate made of styrenic resin

Abstract

Provided is a light-guiding plate which is made of a styrenic resin prepared using a styrenic monomer as the raw material and which exhibits excellent heat resistance and rarely yellows during molding. A light-guiding plate made of a styrenic resin that has a methanol-soluble matter content of 1.5% by mass or less and a weight-average molecular weight (Mw) of 150,000 to 450,000.

Description

technical field [0001] The present invention relates to a light guide plate formed of a styrene-based resin using a styrene-based monomer as a raw material. Background technique [0002] As backlights for liquid crystal displays, there are direct type backlights in which a light source is arranged on the front of a display device, and edge-lit backlights in which a light source is arranged on a side surface. Light guide plates are installed in edge-lit backlights to guide light from the side to liquid crystal panels, and are used in a wide range of applications, including televisions, desktop PCs, notebook PCs, mobile phones, and car navigation. [0003] Acrylic resins such as PMMA (polymethyl methacrylate) are mainly used in light guide plates. Although these resins have excellent optical properties such as transparency, they tend to have high water absorption, which may cause warping of molded products. Dimensions Variety. [0004] Therefore, it has been proposed to use ...

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Problems solved by technology

[0007] Patent Document 2 discloses a light guide plate formed of a styrene-based monomer-(meth)acrylic monomer-system copolymer, the styrene-based monomer-(meth)acrylic-based monomer-system copolymer is 95.5 to 99 It is composed of styrene-based monomers in weight % and 1 to 4.5 weight % of (meth)acrylic monomers, and has a Mw of 160,000 to 350,000, but it shows high water absorption, and the ratio of water absorption and warpage to styrene-based monomers is Large trend of raw material styrenic resin

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