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Resin with excellent processability for lightguide plate

A technology of light guide plate and resin, which is applied in the direction of nonlinear optics, light guide of lighting system, optics, etc., can solve the problem that the resin plate is not carried out, and achieve the effect of improving processability

Inactive Publication Date: 2005-11-09
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, until now, research on the improvement of resin sheets aimed at improving their workability has not been carried out

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 96 parts by mass of methyl methacrylate and 4 parts by mass of n-butyl acrylate were supplied to a reactor equipped with a cooling pipe, a thermometer, and a stirrer as a molecular weight modifier, and after adding 0.063 parts by mass of n-dodecyl mercaptan, stirring While heating, add 0.05 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) as a polymerization initiator when the internal temperature reaches 80°C, and then heat to the internal temperature of 90°C and keep it for 13 minutes and cooled to room temperature to obtain a slurry with a degree of polymerization of about 26% by mass and a viscosity of 2 Pa.s at 20°C. Next, 0.15 mass parts of ethylene glycol dimethacrylate, 0.00005 mass parts of titanium oxide with an average particle diameter of 0.2 μm (corresponding to 0.5 ppm in the obtained resin plate), 0.13 mass parts were added to 100 mass parts of the slurry. After tert-hexyl peroxypivalate, 0.005 parts by mass of bis(2-ethylhexyl) sodium sulfosuccina...

Embodiment 2～6

[0043] An acrylic resin plate was obtained in the same manner as in Example 1, except that the type and amount of monofunctional acrylate added (100 parts by mass in total with methyl methacrylate) and the amount of ethylene glycol dimethyl methacrylate added were changed. . Table 1 shows the evaluation results of the obtained resin boards.

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PUM

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Abstract

This invention provides a resin for light guiding plates which retains physical properties as acrylic resins such as transparency and exhibits good processability with minimum scorching of an edge during polishing or cutting. This resin for light guiding plates is made of a polymer prepared by polymerizing a mixture comprising 100 parts by weight of a polymerizable material consisting of 91 to 100% by weight of methyl methacrylate and 0 to 9% by weight of a monofunctional acrylate, and 0.01 to 2 parts by weight of a polyfunctional (meth)acrylate. The resin preferably comprises 0.01 to 1000 ppm of a diffusing agent.

Description

technical field [0001] The present invention relates to a resin for light guide plates excellent in workability such as cutting and end surface grinding. Background technique [0002] A light guide plate is widely used as a backlight member constituting a liquid crystal display (see, for example, JP-A-4-145485). This light guide plate is used by allowing light emitted from a light source such as a cold cathode tube to enter from an end surface of the light guide plate and to emit in the surface direction of the light guide plate. The light guide plate uses acrylic resin with high light transmittance. When producing a light guide plate from an acrylic resin plate, the resin plate is cut to a predetermined size, and the end surface is ground with a grinder such as a diamond turning tool, and used as a light incident surface. In this way, when cutting a resin plate or grinding an end face with a grinder, there is a problem that the life of the grinding blade is shortened due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00C08F220/12C08F220/14C08L33/12F21V8/00G02B1/04G02F1/13357
CPCG02B6/0011G02B1/04C08F220/12C08L33/12G02B6/0001C08L33/06
Inventor 川合治恩田智士畠山宏毅
Owner MITSUBISHI CHEM CORP
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