White polyester film and reflective sheet

A polyester film and white technology, which is applied in thin material processing, transportation and packaging, chemical instruments and methods, etc., can solve the problems of not being able to meet the requirements of high brightness and high concealment, and achieve low cost, high concealment, high brightness effect

Active Publication Date: 2009-12-16
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technologies described in these documents cannot meet the recent demands for high brightness and high concealment. Moreover, Patent Document 8 uses a cycloolefin copolymer and an ultraviolet stabilizer to achieve both cost and performance, but it cannot sufficiently achieve both. It suppresses the deterioration of reflectivity and screen brightness caused by ultraviolet rays

Method used

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  • White polyester film and reflective sheet
  • White polyester film and reflective sheet
  • White polyester film and reflective sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment -a

[0229] A. Polyester resin

[0230] (polyester resin (A1, A2))

[0231] It takes 4 hours to pre-load about 123 kg of bis(hydroxyethyl) terephthalate, maintain at a temperature of 250 ° C, and a pressure of 1.2 × 10 5 In the esterification reaction tank of Pa, 100 kg of high-purity terephthalic acid (manufactured by Mitsui Chemicals Co., Ltd.) and 45 kg of ethylene glycol (manufactured by Nippon Shokubai Co., Ltd.) were sequentially supplied, and the esterification reaction was carried out in 1 hour after the supply was completed. 123 kg of the esterification reaction product was transferred to the polycondensation tank.

[0232] Then, in the above-mentioned polycondensation reaction tank into which the esterification reaction product was fed, 0.01 kg of ethyl diethylphosphonoacetate was added, and then 0.04 kg of magnesium acetate tetrahydrate was added. An ethylene glycol solution of antimony trioxide (manufactured by Sumitomo Metal Mining Co., Ltd.) was added as a polymeriz...

Embodiment 1

[0274] The polyester resin (A) and the masterbatch (Com1) which were pre-vacuum-dried at 160°C for 5 hours were supplied to the extruder (a) at a ratio of 1:2 in terms of weight, and melted and extruded at a temperature of 280°C. After being discharged, the foreign matter is filtered by using a 30 μm cut-off filter, and sent to the T-die die to make a molten sheet, and the molten sheet is made to adhere to the drum-shaped cylinder with a surface temperature of 18 ° C to cool and solidify by using an electrostatic method to obtain Unstretched film. Next, after preheating the unstretched film with a roller group heated to a temperature of 85° C. according to a conventional method, stretch it 3.2 times in the longitudinal direction (longitudinal direction) using a heating roller at a temperature of 90° C. The temperature of the roller group is cooled to obtain a uniaxially stretched film.

[0275] While clamping both ends of the obtained uniaxially stretched film with clips, it ...

Embodiment 2～4、 Embodiment 8～12、 Embodiment 15～19、 comparative example 2、5

[0277] In the same manner as in Example 1, a compounding ratio in terms of weight in Table 4 was used to obtain a film having two thicknesses of 75 μm and 188 μm. Table 4, Table 6, and Table 7 summarize the resin ratio, various additive amounts, and physical properties and effects of the obtained film. In addition, in Example 9, since the pressure of the filter after the extruder (a) increased, the discharge amount and the film forming speed were reduced to obtain a film.

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Abstract

In view of the above problems of the art, it is an object of the present invention to provide a white polyester film which achieves a high reflectivity and a high hiding property simultaneously, and hardly causes a film break and has high productivity. This object can be achieved by a white polyester film containing voids therein, wherein a resin constituting the film has a layer formed by using a polyester resin and a cyclic olefin copolymerized resin, and wherein a ratio of the void in a cross-section of the layer is more than 25% and 75% or less and the average particle size on number of the cyclic olefin copolymerized resin in the film is 0.1 mu m or more and 3 mu m or less.

Description

technical field [0001] This invention relates to white polyester films. More specifically, the present invention relates to a polyester film that contains cavities inside the film, has excellent reflection properties and concealment, and has good productivity, and relates to a reflective sheet that can be suitably used for backlight devices and lamp reflectors for image display. sheet), reflective sheets for lighting appliances, reflective sheets for illuminated billboards, and white polyester films for back reflective sheets for solar cells. Background technique [0002] The white polyester film is uniform and It is widely used due to its high brightness, dimensional stability, and low cost. As a method of exhibiting high brightness, it is widely used to include a large number of inorganic particles such as barium sulfate in a polyester film, and use the void interface of the interface between the polyester resin and the particles and the fine cavities generated with the ...

Claims

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Application Information

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IPC IPC(8): C08J5/18B32B27/36C08L67/00G02B1/10G02B5/08G02F1/1335
CPCB32B2250/40B32B2307/41B32B2255/26B32B27/08C08J2367/02B32B27/205G02F1/133553B32B2250/03G02F1/133605G02B5/0268G02B5/0247G02B6/0055B32B2255/10B32B2307/518B32B2270/00C08J5/18B32B27/325B32B2250/24B32B2551/08B32B2264/0257B32B2307/416G02B5/0284B32B27/36B32B2307/538Y10T428/254Y10T428/24355Y10T428/249986Y10T428/249992Y10T428/249991C08L67/00G02B5/08
Inventor 上田隆司藤井秀树吉田达朗高桥弘造奥田昌宽田中和典平冈俊彦
Owner TORAY IND INC
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