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Resin composition for light diffusion plate, light diffusion plate and method for producing the same

A technology of resin composition and light diffusion plate, applied in optics, applications, optical components, etc., can solve the problems of small transmittance, unevenness, low hygroscopicity, etc., and achieve low water absorption, high productivity, and high usefulness Effect

Active Publication Date: 2010-08-11
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As mentioned above, in addition to the light diffusing properties, the light diffusing plate also requires excellent processability, small transmittance unevenness, and low hygroscopicity of the resin composition used, and there is no material that can satisfy these properties at the same time. light diffuser

Method used

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  • Resin composition for light diffusion plate, light diffusion plate and method for producing the same
  • Resin composition for light diffusion plate, light diffusion plate and method for producing the same
  • Resin composition for light diffusion plate, light diffusion plate and method for producing the same

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Experimental program
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Embodiment

[0103] The present invention will be described more specifically with examples below. The present invention should of course not be limited by the scope of these examples. Unless otherwise stated, the following "parts" and "%" are mass standards.

[0104] Description of the measurement method used

[0105] GPC Determination Conditions for Multi-branched Macromonomers

[0106] GPC measurement of multi-branched macromonomers was carried out under the following conditions: high performance liquid chromatography (HLC-8220GPC manufactured by Tosoh Corporation), RI detector, TSK gelG6000H×1+G5000H×1+G4000H×1+ G3000H×1+TSK guard column H×1, solvent THF, flow rate 1.0ml / min, temperature 40°C.

[0107] GPC-MALS determination

[0108] Carry out the GPC-MALS determination of styrene-based resin under the following conditions: Shodex HPLC, detector Wyatt Technology DAWN EOS, Shodex RI-101, chromatographic column Shodex KF-806L × 2, solvent THF, The flow rate is 1.0ml / min. In additio...

reference example 1

[0123] Synthesis of reference example 1 multi-branched macromonomer (Mm-1)

[0124] In a 1000-ml eggplant-shaped flask equipped with a stirring device, dropping funnel, thermometer, nitrogen gas introduction device, and bubbler, dissolve 4-bromobis(ethyleneoxy)phenylacetonitrile 35 in dimethyl sulfoxide under a nitrogen atmosphere. (DMSO). After making the inner temperature of the water bath 30° C., 44 ml of 50% sodium hydroxide aqueous solution was dropped over 3 minutes. The mixture was kept at 30° C. and stirred for 2 hours to obtain a precursor of a highly branched macromonomer. Further, 50.0 g of 4-chloromethylstyrene was dripped into the reactant and stirred for 2 hours to obtain a solution of a highly branched macromonomer.

[0125] The obtained solution was filtered to remove solid matter, and the filtrate was poured into 5 L of methanol containing 225 ml of a 5 mol / L aqueous hydrochloric acid solution to precipitate a multi-branched macromonomer. The multi-branched...

reference example 2

[0127] Synthesis of reference example 2 multi-branched macromonomer (Mm-2)

[0128]

[0129] In a 2L flask equipped with a stirrer, a thermometer, a dropping funnel, and a condenser, at room temperature, add 50.5 g of ethoxylated pentaerythritol (5 mole-ethylene oxide addition pentaerythritol), BF 3 Diethyl ether solution (50%) 1g, heated to 110°C. While controlling the heat generation of the reaction, 450 g of 3-ethyl-3-(hydroxymethyl)oxetane was slowly added thereto over 25 minutes. After the end of the exotherm, the reaction mixture was further stirred at 120°C for 3 hours, after which it was cooled to room temperature. The obtained highly branched polyether polyol had a weight average molecular weight of 3,000 and a hydroxyl value of 530.

[0130] Synthesis of multi-branched macromonomers with methacryloyl and acetyl groups

[0131]Into a reactor equipped with a stirrer, a thermometer, a Dean Stark Decanter equipped with a condenser, and a gas introduction pipe, add ...

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Abstract

Disclosed is a resin composition for light diffusion plates, which contains a specific styrene resin and a light-diffusing agent. Also disclosed is a light diffusion plate obtained by molding such a resin composition for light diffusion plates. Specifically, the resin composition for light diffusion plates contains, as the styrene resin, a resin obtained by copolymerizing a hyperbranched macromonomer with a styrene monomer. The hyperbranched macromonomer has a plurality of branches and a plurality of polymerizable double bonds at the end portions of the branches. By using such a resin composition, there can be obtained a light diffusion plate having good light diffusibility and low water absorption, which is suppressed in transmittance variations. In addition, by using such a styrene resin, injection molding which enables to perform molding and surface processing of a light diffusion plate simultaneously can be employed.

Description

technical field [0001] The present invention relates to a resin composition for a light-diffusing plate, a light-diffusing plate obtained by molding the resin composition, and a manufacturing method thereof; the resin composition for a light-diffusing plate contains a styrene resin having a branched chain structure and a light The diffusing agent is excellent in processability, and the light diffusing property, low water absorption property, and transmittance unevenness of the obtained light diffusing plate are good. Background technique [0002] In recent years, in the field of transmissive displays, high luminance, thinning, and high luminance uniformity are required, and a combination of multiple light sources, a reflector installed on the back, and a diffuser that serves as a light-emitting surface have been proposed. The direct type backlight of the composition of the board. This device has a high utilization efficiency of light beams and is easy to increase luminance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02F21V3/00F21V3/04G02F1/13357
CPCC08F290/02B29D11/00798C08F291/00C08L25/08F21V3/04G02B5/02G02F1/1335
Inventor 藤平卫山崎裕之武井俊夫
Owner DIC CORP
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