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Light diffusion sheet

A technology of light diffusion sheets and multilayer sheets, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of light diffusion plate molded body size change, high water absorption rate, light diffusion plate warping, etc., and achieve resource reuse Excellent performance, improved yield, and excellent brightness

Inactive Publication Date: 2009-08-19
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology is not sufficient to obtain a molded article for screen lenses with excellent light diffusivity.
[0006] In addition, in the methacrylic resin used as the base material of the light diffusion plate of the liquid crystal television, due to its high water absorption rate, the size of the molded body of the light diffusion plate changes, the light diffusion plate warps, and the optical properties damaged problem
In addition, there is a problem of discoloration or discoloration of the image due to degradation of the resin used in the screen lens and the light diffusion plate if the image or the light of the lamp is projected for a long time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～1-25

[0132] Examples 1-1 to 1-25, Comparative Examples 1-1 to 1-28

[0133] Using styrene-based resin compositions 1-1 to 1-49, utilize a multi-layer extruder with a T-die mode with feed blocks to manufacture the multi-layer structures shown in Tables 1-6 to 1-11 (three layer structure) light diffuser. In addition, the multilayer extruder used the following test extruder, that is, a 65mmφ full-flight screw single-screw extruder for the middle layer, a 30mmφ full-flight screw single-screw extruder for the front layer and the back layer. Each discharge machine is composed of one machine, and each molten resin is merged and multi-layered in the feed block. When forming the sheet, the operating temperature of each cylinder was 230°C.

[0134] The optical properties, light resistance, moisture absorption warpage, thermal stability, antistatic property, and scratch resistance of the obtained light-diffusing sheet were evaluated, and the data are shown in Tables 1-6 to 1-11.

[0135] In ...

Embodiment 2-1～2-21、 comparative example 2-1～2-26

[0137] Using styrene-based resin compositions 2-1 to 2-43, utilize a multilayer extruder with a T-die mode to manufacture the multilayer structures shown in Tables 2-6 to 2-10 (three layers) structure) light diffuser. In addition, the multilayer extruder used the following test extruder, that is, a 65mmφ full-flight screw single-screw extruder for the middle layer, a 30mmφ full-flight screw single-screw extruder for the front layer and the back layer. Each discharge machine is composed of one machine, and each molten resin is merged and multi-layered in the feed block. When forming the sheet, the operating temperature of each cylinder was 230°C.

[0138] The optical properties, light resistance, moisture absorption warpage, thermal stability, antistatic property, and scratch resistance of the obtained light-diffusing sheet were evaluated, and the data are shown in Tables 2-6 to 2-10.

[0139] Furthermore, (A-2)~(A-4), (B-1)~(B-4) which are styrene-based copolymers were mixed...

Embodiment 3-1～3-13、 comparative example 3-1～3-25

[0141] Using styrene-based resin compositions 3-1 to 3-32, light diffusers with three-layer structures shown in Tables 3-5 to 3-12 were manufactured using a multi-layer extruder with a T-die type with a feed block Tablets 3-1 to 3-38. In addition, the multilayer extruder used the following test extruder, that is, a 65mmφ full-flight screw single-screw extruder for the middle layer, a 30mmφ full-flight screw single-screw extruder for the front layer and the back layer. Each discharge machine is composed of one machine, and each molten resin is merged and multi-layered in the feed block. When forming the sheet, the operating temperature of each cylinder was 230°C.

[0142] In addition, to the styrene-based resin composition used in the middle layer of the sheet, 2 to 30% by mass of pulverized products obtained by pulverizing the obtained light diffusion sheets 3-1 to 3-38 were added, and the multilayered The extruder produces light-diffusing sheets 3-1' to 3-38' with a three-l...

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Abstract

The invention provides a light diffusion sheet excellent in dimensional stability, light resistance, light diffusion characteristics, thermal stability, brilliance, and recyclability. A multi-layer light diffusion sheet comprising a face layer (a) and a back layer (c) which are made of a styrenic resin composition (A) comprising 100 parts by mass of a styrenic copolymer comprising 20 to 100% by mass of styrenic monomer units and 80 to 0% by mass of (meth)acrylic ester monomer units, 1 to 10 parts by mass of an unmolten compound which has a difference of 0.005 or below in refractive index from the styrenic copolymer and a mean particle size of 5 to 15[mu]m, 0.1 to 2 parts by mass of a hindered amine, and 0.1 to 2 parts by mass of a benzotriazole and an interlayer (b) which is made of a styrenic resin composition (B) comprising 100 parts by mass of a styrenic copolymer comprising 90 to 99% by mass of styrenic monomer units and 10 to 1% by mass of (meth)acrylic acid monomer units and either 1 to 10 parts by mass of an unmolten compound which has a difference of 0.05 to 0.15 in refractive index from the styrenic copolymer and a mean particle size of 2 to 10[mu]m or 0.5 to 2.5 parts by mass of crosslinked polyorganosiloxane beads having particle sizes of 1 to 10[mu]m.

Description

technical field [0001] The present invention relates to a multilayer sheet excellent in light diffusivity, dimensional stability, light resistance, thermal stability, luminance, and resource recyclability. In particular, it is related with the light-diffusion sheet used as the projection-type screen which projects the screen of a television etc., and the light-diffusion board of a liquid crystal television. Background technique [0002] A screen lens on which images are projected and displayed, such as a projection screen used in a projection television. Since the screen lens is desired to be bright and have a wide viewing angle when observed by the observer, a configuration combining lens moldings such as lenticular lenses and Fresnel lenses is generally employed. Among these lens moldings, methacrylic resins excellent in transparency, light resistance, scratch resistance, and moldability are widely used, and these moldings are generally processed by pressure molding, extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02B32B7/02B32B27/18B32B27/30C08G69/44C08K5/17C08K5/3435C08K5/3475C08L25/14C08L77/12
CPCC08K5/16C08L2205/22C08L83/04C08L25/14B32B27/18C08L83/00B32B7/00G02B5/02G02F1/1335
Inventor 渡边真太郎山田毅高桥淳
Owner DENKA CO LTD