Unlock instant, AI-driven research and patent intelligence for your innovation.

Multilayered light diffuser plate

A technology of light diffusing and absorbing layers, applied in the field of light diffusing plates, can solve the problems of easy discoloration of light diffusing plate 1 and the like

Inactive Publication Date: 2007-07-11
SUMITOMO CHEM CO LTD
View PDF1 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the LCD screen size increases, cold cathode fluorescent lamps 5 having a larger size have been gradually used, and the amount of UV light emitted from the cold cathode fluorescent lamps 5 has also been increased accordingly, so that the light diffusing plate 1 is damaged due to aging of the plate 1. easy to change color

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multilayered light diffuser plate
  • Multilayered light diffuser plate
  • Multilayered light diffuser plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1: Preparation of light diffusing agent masterbatch

[0069] To 46 parts by weight of polystyrene (TOYOSTYROL HRM 40 manufactured by Toyo Styrene Co., Ltd.; MFR (melt flow rate) = 0.9-1.3 g / 10 minutes), 40 parts by weight of crosslinked acrylic resin particles (Sumitomo Chemical Co. ., Ltd. manufactured SUMIPEX XC1A), 4 parts by weight of silicone resin particles (DY33-719 manufactured by Toray Dow Corning Co.), 8 parts by weight of UV absorber (dimethyl (p-methoxybenzylidene) ) malonate) (HOSTAVIN PR-25 manufactured by Clariant), 2 parts by weight of a processing stabilizer (2,6-di-tert-butyl-4-methylphenol) (YOSHINOXBHT manufactured by API Co., Ltd.) To the mixture was added 0.03 parts by weight of an oxazole optical brightener (WHITEFLUOR PSN conc. manufactured by SUMIKA COLORCo., Ltd.). Then, the mixture was dry-blended and granulated by extrusion at 80° C. to 250° C. using a twin-screw extruder with a diameter of 65 mm to obtain light-diffusing agent ma...

Embodiment 2

[0078] A multilayer light-diffusing plate was manufactured in the same manner as in Example 1, except that 1.6 parts by weight of UV absorber (2,2'-methylene-bis[4-tert-octyl-(6-2H-benzotri Azol-2-yl)phenol]) (ADEKASTAB LA-31 manufactured by Asahi Denka Co.) was substituted for the UV absorber TINUVIN 1577FF. The evaluation results are shown in Table 1.

Embodiment 3

[0080] A multilayer light-diffusing plate was produced in the same manner as in Example 1, except that 2 parts by weight of UV absorber (2-(3,5-bis-α-cumyl-2-hydroxyphenyl)-2H-benzo Triazole) (TINUVIN manufactured by Ciba Specialty Chemicals, Inc.  234) instead of UV absorber TINUVIN 1577FF. The evaluation results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

A multilayered light diffuser plate having a light diffusing layer made of a transparent resin selected from the group consisting of styrene polymers and styrene monomer-methyl methacrylate copolymers containing a light diffusing agent dispersed therein, and a UV absorbing layer made of a styrene monomer-methyl methacrylate copolymer containing 0.05 to 10 parts by weight of at least one UV absorbing agent selected from the group consisting of a UV absorbing agents represented by the formula (1) and a UV absorbing agents represented by the formula (2) per 100 parts by weight of the styrene monomer-methyl methacrylate copolymer.

Description

technical field [0001] The present invention relates to multilayer light diffusing sheets. In particular, the present invention relates to a light-diffusing plate having a multilayer structure used in constituting a backlight unit for a direct backlight liquid crystal display (LCD) or the like. Background technique [0002] As shown in FIG. 2 , the direct backlight LCD 2 includes a liquid crystal element 3 and a backlight unit 4 provided directly under the liquid crystal element 3 . One example of a widely used backlight unit 4 includes a plurality of cold cathode fluorescent lamps (CCFL) 5 as light sources and a light diffusion plate 1 arranged in front of the light sources. [0003] As the LCD screen size increases, cold cathode fluorescent lamps 5 having a larger size have been gradually used, and the amount of UV light emitted from the cold cathode fluorescent lamps 5 has also been increased accordingly, so that the light diffusing plate 1 is damaged due to aging of the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02B5/02G02B1/04G02F1/1335
CPCY10T428/31855C08K5/3492G02B5/0278Y10T428/26C08K5/3475G02B5/0242Y10T428/1036C09K2323/03C08L25/14C08J5/18G02B5/02
Inventor 井山浩畅
Owner SUMITOMO CHEM CO LTD