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White reflective film for large displays

A white reflective film and display technology, which is applied in the field of white reflective film, can solve the problems of cost and other problems, and achieve the effect of excellent reflective characteristics and not easy to be thermally deformed

Active Publication Date: 2020-12-15
TEIJIN DUPONT FILMS JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes are costly

Method used

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  • White reflective film for large displays
  • White reflective film for large displays
  • White reflective film for large displays

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0168] The present invention is described in detail below through examples. In addition, each characteristic value was measured by the following method.

[0169] (1) Light reflectivity

[0170] An integrating sphere was installed on a spectrophotometer (UV-3101PC manufactured by Shimadzu Corporation), and the concentration of BaSO was measured at a wavelength of 550 nm. 4 The reflectance when the whiteboard was set at 100%, was taken as the reflectance. In addition, the measurement was performed on the side used as the reflective surface, that is, the surface on the light source side.

[0171] (2) The average particle size of the particles

[0172] Measurement was performed using a laser scattering particle size distribution analyzer SALD-7000 manufactured by Shimadzu Corporation. For dispersion in ethylene glycol before measurement, the particle powder was weighed to correspond to a slurry concentration of 5% by mass, stirred in a mixer for 10 minutes, cooled to normal te...

manufacture example 1

[0212]

[0213] 136.5 parts by mass of dimethyl terephthalate, 13.5 parts by mass of dimethyl isophthalate (that is, the isophthalic acid component is 9 mol% relative to 100 mol% of the total acid components of the obtained polyester), ethylene glycol Add 98 parts by mass of alcohol, 1.0 part by mass of diethylene glycol, 0.05 part by mass of manganese acetate, and 0.012 parts by mass of lithium acetate into a flask equipped with a rectification tower and a distillation condenser, and heat to 150-240° C. while stirring, Methanol was distilled off for transesterification. After methanol was distilled off, 0.03 parts by mass of trimethyl phosphate and 0.04 parts by mass of germanium dioxide were added, and the reactant was moved to a reactor. Then, while stirring, the pressure in the reactor was gradually reduced to 0.3 mmHg, and at the same time, the temperature was raised to 292° C. to carry out polycondensation reaction to obtain isophthalic acid copolymerized polyethylene ...

manufacture example 2

[0214]

[0215] Except changing to 129.0 parts by mass of dimethyl terephthalate and 21.0 parts by mass of dimethyl isophthalate (that is, the isophthalic acid component is 14 mol% relative to 100 mol% of the total acid components of the obtained polyester), Otherwise, isophthalic acid-copolymerized polyethylene terephthalate 2 was obtained in the same manner as in Production Example 1 above. The polymer has a melting point of 215°C.

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Abstract

An object of the present invention is to provide a white reflective film that is not easily thermally deformed while having excellent reflective properties. This problem is achieved by a white reflective film having a reflective layer A that satisfies any one of the following a and b, a. contains a thermoplastic resin composition A1 in which the thermoplastic resin A1 is contained Contains calcium carbonate particles, the content of the calcium carbonate particles is 10% by mass to 70% by mass relative to the mass of the thermoplastic resin composition A1, or b. The thermoplastic resin composition A2 is contained in the thermoplastic resin composition A2. Resin A contains calcium carbonate particles and resins incompatible with the thermoplastic resin A, and the content of the calcium carbonate particles is 5% by mass to 69% by mass relative to the mass of the thermoplastic resin composition A2. The content is 1% by mass to 40% by mass relative to the mass of the thermoplastic resin composition A2, and the sum of the content of the calcium carbonate particles and the incompatible resin is 10% by mass to 70% by mass relative to the mass of the thermoplastic resin composition A2 % by mass, and the average particle diameter of the calcium carbonate particles is 0.1 μm to 1.2 μm, and the 10% volume particle diameter D10, 50% volume particle diameter D50 and 90% volume particle diameter D90 accumulated from the small particle diameter side satisfy (D90 ‑D10) / D50≦1.6, the reflectivity of the film is above 60%.

Description

technical field [0001] The present invention relates to a white reflective film for a large display that can be suitably used as a reflector. Background technique [0002] The surface light source is equipped with a reflector on the back, and the reflector reflects the light emitted by the light source to the front so as to improve the extraction efficiency of light, thereby increasing the brightness. [0003] For example, the backlight unit of a liquid crystal display device (hereinafter also referred to as LCD) has the following types: a direct type with a light source and a reflective film on the back of the liquid crystal display panel, and a light guide plate with a reflector on the back of the liquid crystal display panel. , A side light type with a light source on the side of the light guide plate. As a light source, CCFLs have been used until now, but in recent years, light-emitting diodes (hereinafter also referred to as LEDs) have been used due to the need for low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08F21V7/30F21V7/22F21V7/00B32B27/00B32B27/20B32B27/36B32B27/08B32B7/023B32B33/00
CPCB32B27/00B32B27/20B32B27/36F21S2/00F21V7/00G02B5/08F21V7/30B32B27/08F21V7/22B32B2307/416
Inventor 浅井真人仓垣雅弘冈田真一郎大泽利洋
Owner TEIJIN DUPONT FILMS JAPAN
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