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Light diffusion film

A technology of light diffusing film and catalyst, applied in optics, light guides, optical components, etc., can solve problems such as damage to production efficiency, pollution of light diffusing film, low performance, etc., and achieve the effect of good scratch resistance

Inactive Publication Date: 2009-07-08
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the optical characteristics required by the light diffusion sheet, it is often designed to increase the protruding surface area of ​​the beads to about half of the total surface area. In the manufacturing process of the light diffusion film, the resin particles are easy to fall off from the synthetic resin layer. This problem is caused by light diffusion. Membrane fouling, damage and important reasons for low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0089] The invention is illustrated by the following examples.

Synthetic example 1

[0091] Into a dry reaction vessel equipped with a stirrer, a thermometer, a cooler, and a nitrogen conduit, 42 parts by mass of polycaprolactone triol (Praccel 308, manufactured by Daicel Chemical Co., Ltd.) and 50 parts by mass of hexamethylene diisocyanate were mixed. (hereinafter, abbreviated as HDI), 0.1 parts by mass of dibutyltin dilaurate, and reacted for 10 hours while stirring under the condition of 120° C. in a nitrogen atmosphere. Then, after removing unreacted HDI under reduced pressure, toluene was added to obtain a prepolymer (1) having a nonvolatile content of 90% by mass.

[0092] In a separable flask with a stirrer, 670 parts by mass of 2% methyl cellulose water was mixed, and while stirring, 102 parts by mass of prepolymer (1), 100 parts by mass of methyl methacrylate, A solution consisting of 10 parts by mass of toluene and 2 parts by mass of tert-butyl peroxytrimethylacetate (Perbull PV, manufactured by NOF Corporation) was prepared as a suspension. Under ...

Synthetic example 2

[0094] Using the same method as in Synthesis Example 1, 48 parts by mass of polycaprolactone diol (Praccel 210, manufactured by Daicel Chemical Co., Ltd.), 42 parts by mass of HDI, and 0.1 part by mass of octyltin dilaurate were reacted, and toluene was added. , to obtain a prepolymer (2) having a nonvolatile content of 70% by mass.

[0095] In a separable flask with a stirrer, 700 parts by mass of 3% methylcellulose water was mixed, and while stirring, 128 parts by mass of prepolymer (2), 75 parts by mass of methyl methacrylate, A solution consisting of 25 parts by mass of n-butyl methacrylate and 3 parts by mass of t-butylperoxy-2-ethylhexanoate (Cayaestel O, manufactured by Kayaku Akuzo Co., Ltd.) was prepared as a suspension. Under the condition of stirring, raise the temperature of the suspension to 60°C and react for 5 hours, then raise the temperature to 100°C for more than 1 hour, and separate toluene by azeotropic method. After cooling, carry out solid-liquid separati...

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Abstract

Disclosed is a light diffusion film comprising a light diffusion layer which has adequate light transmitting properties and light diffusion properties while exhibiting high abrasion resistance. In this light diffusion film, resin particles are hardly separated from the light diffusion layer. Specifically disclosed is a light diffusion film wherein a light diffusion layer, which is obtained by dispersing acrylic urethane resin particles in a resin binder, is arranged on at least one side of a transparent sheet-like base. Preferably, the resin binder is an acrylic copolymer containing 1-50% by mass of an acrylic monomer unit having a hydroxyl group and crosslinked by a polyisocyanate, and the resin particles contain a curing catalyst which serves as a catalyst for a crosslinking reaction between an acrylic polyol and a polyisocyanate.

Description

technical field [0001] The present invention relates to a light-diffusing film, particularly a light-diffusing film used as a component of a backlight module of a liquid crystal display device. Background technique [0002] The light diffusion film is used to diffuse light from point light sources or linear light sources, or to adjust the angle of outgoing light, so as to obtain uniform surface illumination with high front brightness. Such a light-diffusing film is widely used in, for example, liquid crystal displays and liquid crystal televisions equipped in mobile phones, digital cameras, and the like. [0003] Conventionally, the general structure of a liquid crystal display device equipped in a computer, a mobile phone, a digital camera, etc. is as follows: figure 1 shown. The light diffusion film 7 is generally used as one of the constituent elements of the backlight module 2 . The light diffusion film 7 is generally arranged between the light guide plate 5 and the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/02B32B7/02B32B27/20
CPCG02B6/0051G02B6/0065B32B2307/584C08J5/18G02B5/0268G02F1/133606
Inventor 早川智高岛正直中川聪岛村佳乃助
Owner DAINIPPON INK & CHEM INC