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Reflective film and reflector plate

A technology of reflective film and refractive index, applied in the field of reflective film, can solve the problems of reduced light reflectivity of reflective film, high light reflectivity of polyester film, poor film forming ability, etc., and achieves excellent dimensional stability, high light reflectivity and balance. excellent effect

Inactive Publication Date: 2007-07-11
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a reflective film, JP-A-4-239540 and JP-A-2002-138150 disclose a white polyester film in which a filler is added to an aromatic polyester resin by stretching. In the formed sheet, fine bubbles are formed in the sheet, thereby causing light scattering and reflection, but the polyester film is not a film with the required high light reflectivity.
In addition, since the aromatic rings contained in the molecular chains of the aromatic polyester-based resins that form them absorb ultraviolet rays, there are cases where film degradation, yellowing, and light reflection of reflective films are caused by ultraviolet rays emitted from light sources such as liquid crystal display devices. Disadvantages such as reduced sex
[0005] In addition, JP-A-11-174213 discloses a porous sheet in which an inorganic filler is added to a polypropylene resin and stretched, but there are some cases where 60% by weight or more of the inorganic filler must be added and the film-forming property is poor. question
[0006] In addition, JP-A-6-298957 discloses a film in which a resin having a specific refractive index and an inorganic filler are mixed and stretched, JP-A-7-230004, JP-A-7-287110, And JP-A-8-262208 discloses a reflection sheet in which an inorganic filler is mixed with a polyolefin resin and stretched, and JP-A-11-149816 discloses a polyolefin mixed with sulfuric acid Barium and stretched reflective film, but we must try to improve the stretchability, for example, we must try to add processing aids, etc.
In addition, although the reflectivity is improved by stretching, there are also problems such as the time-dependent change of the orientation relaxation phenomenon or the large dimensional change caused by the heating environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] 60% by mass of polybutylene succinate ester lactide polymer (GS-PLaAZ91T: manufactured by Mitsubishi Chemical Co., Ltd., refractive index 1.51) and 40% by mass of rutile titanium oxide with an average particle size of 0.25 μm (Covered with alumina and silica, with a vanadium content of 0.5 ppm, and a refractive index of 2.7) mixed to form a mixture. The mixture was kneaded at 180°C using a biaxial extruder, and then the resin composition in a molten state was extruded into a sheet through a T-die at 180°C, and cooled and solidified to produce a reflective film with a thickness of 250 μm.

[0119] The reflectance, thermal shrinkage, and yellowing prevention properties of the obtained reflective film before and after ultraviolet irradiation were measured and evaluated. The results are shown in Table 1.

Embodiment 2

[0121] As shown in Table 1, 60% by mass of polypropylene resin (NOVATEC PP FY4: manufactured by Japan Polypropylene, refractive index 1.50) and 40% by mass of rutile titanium oxide with an average particle size of 0.25 μm (Covered with alumina and silica, with a vanadium content of 0.5 ppm, and a refractive index of 2.7) mixed to form a mixture. The mixture was kneaded at 200°C using a biaxial extruder, and then the resin composition in a molten state was extruded into a sheet through a T-die at 200°C, and cooled and solidified to produce a reflective film with a thickness of 250 μm.

[0122] The same measurement and evaluation as in Example 1 were performed on the obtained reflective film. The results are shown in Table 1.

Embodiment 3

[0124] As shown in Table 1, 50% by mass of rubber-dispersed polymethyl methacrylate polymer (SUMIPEX IRD50: manufactured by Sumitomo Chemical Co., Ltd., refractive index 1.49) and 50% by mass of an average particle diameter of 0.25 μm Rutile titanium oxide (coated with alumina and silica, with a vanadium content of 0.5 ppm and a refractive index of 2.7) is mixed to form a mixture. The mixture was kneaded at 230°C using a biaxial extruder, and then the resin composition in a molten state was extruded into a sheet through a T-die at 230°C, and cooled and solidified to produce a reflective film with a thickness of 250 μm.

[0125] The same measurement and evaluation as in Example 1 were performed on the obtained reflective film. The results are shown in Table 1.

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Abstract

Disclosed is a reflective film with excellent dimensional stability which exhibits excellent light-reflecting properties and does not suffer from yellowing over time or deterioration in the light-reflecting properties during use. Specifically disclosed is a reflective film which is composed of a substantially non-stretched film having an A layer that is made of a resin composition A containing a resin having a refractive index of less than 1.52 and a titanium oxide. The titanium oxide has a refractive index of not less than 2.5, and the vanadium content in the titanium oxide is not more than 5 ppm. The reflectance of the reflective film with respect to light having a wavelength of 550 nm is not less than 95%, and the thermal shrinkage of the reflective film after a 180-minute treatment at 80 DEG C is more than -0.1% and less than 1.0% in both longitudinal direction (MD) and transverse direction (TD).

Description

Technical field [0001] The present invention relates to a reflective film and a reflective plate formed with the reflective film. In particular, it relates to a reflective film used in reflective plates such as liquid crystal display devices, lighting equipment, and illuminated signboards. Background technique [0002] In recent years, reflective films have been used in fields such as reflective plates used in liquid crystal display devices, projection screens or surface light source components, reflective plates used in lighting equipment, and reflective plates used in illuminating billboards. For example, in the reflector of a liquid crystal display, in order to increase the performance of the backlight unit by supplying as little but as much light as possible to the liquid crystal from the perspective of the requirements for larger screens and higher display performance of the device, A reflective film that requires high reflective performance. [0003] In addition, as a displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L101/12B32B27/18G02B5/08C08K3/22G02F1/1335
CPCB32B2264/102B32B27/322B32B2590/00G02F1/133553B32B27/08G02B5/0808B32B2307/71B32B2307/734B32B27/36B32B2457/202B32B7/02B32B27/308G02B6/0065C08J5/18B32B15/08B32B27/20G02F2203/02B32B2307/416G02B6/0055B32B27/32Y10T428/256Y10T428/24942Y10T428/25Y10T428/3154Y10T428/31935Y10T428/31786C08K3/22G02B5/30
Inventor 比留间隆西田未来渡边孝之胜原一成高木润
Owner MITSUBISHI PLASTICS INC
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