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Laminate film

A technology for laminating films and compositions, applied in the field of laminating films, can solve problems such as deterioration and reduction of screen brightness.

Active Publication Date: 2008-07-09
TEIJIN DUPONT FILMS JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cold-cathode tube of the light source used to directly irradiate light from the side or the back generates ultraviolet rays, so as the liquid crystal display is used for a long time, the film of the reflector is degraded by ultraviolet rays, and the brightness of the screen decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Add 132 parts by weight of dimethyl terephthalate, 23 parts by weight of dimethyl 2,6-naphthalene dicarboxylate (12 moles relative to the acid component of polyester) in the flask equipped with a rectification tower and a distillation condenser %), 96 parts by weight of ethylene glycol, 3.0 parts by weight of diethylene glycol, 0.05 parts by weight of manganese acetate, and 0.012 parts by weight of lithium acetate, heated to 150-235 ° C while stirring to distill methanol to carry out transesterification. After methanol was distilled off, 0.03 parts by weight of trimethyl phosphate and 0.04 parts by weight of germanium dioxide were added, and the reactants were transferred to a polymerization reactor. Then, while stirring, the pressure in the reactor was lowered slowly to 0.5 mmHg, and at the same time, the temperature was raised to 290° C. to carry out polycondensation reaction. The diethylene glycol component content of the obtained copolymerized polyester was 2.5 wt%,...

Embodiment 2～8

[0100] After adjusting the addition amount shown in Table 1, the inert particles, and the acid component of the polyester, they were added, and a film was formed under the film forming conditions shown in Table 2, and evaluated.

Embodiment 9

[0102] At the stage of polymer preparation, 23 parts by weight of 2,6-naphthalene dicarboxylate in Example 1 was changed to 18 parts by weight of dimethyl isophthalate (12 mol% relative to the acid component of polyester). Polymers copolymerized with isophthalic acid. This was mixed with the 2,6-naphthalene dicarboxylic acid copolymer prepared in Example 1 so that the mole % of the acid component was about 1 / 11, and films were formed and evaluated under the conditions in Tables 1 and 2.

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Abstract

A white laminated film which has practically sufficient reflectivity at a visible range, can be formed stably, is free from deterioration (yellowing) by ultraviolet radiation, rarely deforms by heat and can be advantageously used as a reflector substrate for liquid crystal displays and internal illumination type electrically spectacular signs, is provided. The laminated film comprises a first layer of a composition which comprises 31 to 60 wt% of inert particles having an average particle diameter of 0.3 to 3.0 µm and 40 to 69 wt% of a polyester consisting of 1 to 100 mol% of naphthalenedicarboxylic acid and 0 to 99 mol% of terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component, and a layer B of a composition which comprises 0 to 30 wt% of inert particles having an average particle diameter of 0.3 to 3.0 µm and 70 to 100 wt% of a polyester consisting of 3 to 20 mol% of naphthalenedicarboxylic acid and 80 to 97 mol% of terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component and which is in direct contact with the first layer.

Description

technical field [0001] The present invention relates to a laminated film and uses utilizing reflectivity and light resistance of the laminated film. In more detail, it relates to the use of a laminated film having a high reflectance and excellent light resistance and heat resistance, a reflective plate, and the like. Background technique [0002] In liquid crystal displays, the backlight method of irradiating light from the back of the display was previously used, but in recent years, the side-light method has been widely used because of the advantage of being able to illuminate uniformly with a thin profile (refer to Japanese Patent Application Laid-Open No. 63-62104, Japan JP-A-8-16175, JP-A-2001-226501, and JP-A-2002-90515). In this side light system, a reflective plate is provided on the rear surface, and high reflectivity and high diffusivity of light are required for the reflective plate. [0003] The cold-cathode tube of the light source used to directly irradiate l...

Claims

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Application Information

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IPC IPC(8): B32B27/36B32B27/20C08K3/00C08L67/02G02B5/02G02B5/08G02F1/13357G09F13/14G02F1/1335
CPCH01L31/0487Y02E10/52B32B2250/244G02F1/133553B32B27/08B32B2307/71G02F1/133605B32B27/36G02B5/0268G02B5/0242B32B2457/202B32B2307/518B32B2264/10B32B27/20B32B2307/308B32B2307/416G02B5/0284H01L31/049Y02E10/50Y10T428/24942Y10T428/24967Y10T428/24975C08K3/00C08L67/02
Inventor 楠目博小山松淳
Owner TEIJIN DUPONT FILMS JAPAN
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