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White reflective film

A reflective film, reflective technology, used in reflectors, nonlinear optics, lighting and heating equipment, etc., can solve problems such as non-self-recycling, inability to suppress damage to light guide plates, and inability to ensure gaps

Active Publication Date: 2015-05-06
TEIJIN DUPONT FILMS JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if soft beads are used like the above-mentioned JP-A-2003-92018 and JP-A-2008-512719, although damage to the light guide plate can be suppressed, it is impossible to achieve the required clearance gap in recent years. If a large stress is applied, the gap may not be secured and the sticking may not be suppressed
For such a problem of securing a gap, it is conceivable to use highly hard beads such as inorganic particles such as true spherical silica or organic particles having a cross-linked structure as beads, but these cannot prevent damage to the light guide plate.
In addition, when using such high-hardness beads (the beads have a size sufficient to ensure a gap), the present inventors have newly discovered and paid attention to the following problem: when recovering a film that does not form a product, use it as a self- When a new film is prepared again from recycled materials, the beads remaining in the recycled materials are mixed into the film, especially the reflective layer, and as a result, the film is often broken, and the film-forming properties of the film are lowered, making it virtually impossible to self-recover.

Method used

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Examples

Experimental program
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Embodiment

[0148] The present invention is described in detail below by way of examples. In addition, each characteristic value was measured by the following method.

[0149] (A) Measurement method for Examples 1-17 and Comparative Examples 1-11

[0150] (1) Light reflectivity

[0151] An integrating sphere was installed on a spectrophotometer (UV-3101PC manufactured by Shimadzu Corporation), and BaSO was measured at a wavelength of 550 nm. 4 The reflectance of the whiteboard was calculated as the reflectance at 100%, and this value was taken as the reflectance. In addition, the measurement was performed on the surface of the support layer B side. When the front and back have different support layers B, the measurement is performed on the surface of the support layer on the side of the light guide plate.

[0152] (2) Average particle diameter of void forming agent (inorganic particles)

[0153] With a particle size distribution meter (LA-950 manufactured by Horiba Manufacturing Co.,...

preparation example 1

[0201] Preparation Example 1: Synthesis of isophthalic acid copolymerized polyethylene terephthalate 1

[0202]136.5 parts by mass of dimethyl terephthalate, 13.5 parts by mass (9 mol % relative to 100 mol % of all acid components of the obtained polyester) of dimethyl isophthalate, 98 parts by mass of ethylene glycol Alcohol, 1.0 parts by mass of diethylene glycol, 0.05 parts by mass of manganese acetate, and 0.012 parts by mass of lithium acetate are put into a flask equipped with a rectification tower and a distillation condenser, and heated to 150~240°C while stirring to distill methanol , for transesterification reaction. After distilling methanol, 0.03 parts by mass of trimethyl phosphate and 0.04 parts by mass of germanium dioxide were added, and the reactant was transferred to the reactor. Next, while gradually reducing the pressure in the reactor to 0.3 mmHg while stirring, the temperature was raised to 292° C., and polycondensation reaction was performed to obtain i...

preparation example 2

[0203] Preparation Example 2: Synthesis of isophthalic acid copolymerized polyethylene terephthalate 2

[0204] Changed to 129.0 parts by mass of dimethyl terephthalate, 21.0 parts by mass (14 mol % with respect to 100 mol % of all acid components of the obtained polyester) of dimethyl isophthalate, in addition, An isophthalic acid copolymerized polyethylene terephthalate 2 was obtained in the same manner as in the above-mentioned Production Example 1. The polymer had a melting point of 215°C.

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Abstract

A white reflective film comprising: a reflective layer (A); a support layer (B) which contains a thermoplastic resin and inactive particles that are dispersed within the thermoplastic resin, and which forms the outermost layer on at least one side; and protrusions caused by the inactive particles on the surface on the reverse side of the support layer (B) to the reflective layer (A), the support layer (B) forming the outermost layer. This film can sufficiently suppress adhesion to a light guide plate, can suppress damage to a light guide plate, and can suppress particle loss. Furthermore, even if the film is recovered and used as a self-recovered raw material in the manufacture of a film, the resulting film exhibits excellent film forming properties.

Description

technical field [0001] This invention relates to white reflective films. In particular, it is related with the white reflective film used for a liquid crystal display device. Background technique [0002] The backlight unit of liquid crystal display device (LCD) has directly under type and edge light (edge ​​light) type, and described under type is provided with light source at the back side of liquid crystal display panel, and then is equipped with reflective film at light source backside; A light guide plate provided with a reflection plate on the rear surface is arranged on the back of the liquid crystal display panel, and a light source is provided on the side surface of such a light guide plate. Conventionally, as backlight units for large LCDs, direct-type (mainly direct-type CCFLs) are mainly used from the viewpoint of excellent screen brightness and uniformity of brightness within the screen, and side-light types are often used in notebook PCs. Smaller LCDs such as...

Claims

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Application Information

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IPC IPC(8): G02B5/08B32B27/36F21V7/22
CPCB32B27/36B32B2307/40G02B5/0808G02B6/0093G02F1/133605
Inventor 小野光正仓垣雅弘楠目博
Owner TEIJIN DUPONT FILMS JAPAN