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White polyester film

A polyester film, white technology, used in layered products, transportation and packaging, synthetic resin layered products, etc., can solve problems such as high brightness and high concealment that are difficult to deal with, and achieve both productivity and performance, low cost. , high brightness effect

Active Publication Date: 2009-01-21
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the technologies described in these documents, it is difficult to cope with the high brightness and high concealment of recent years.

Method used

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  • White polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] The polyester resin (A), masterbatch pellets (Com7), and masterbatch pellets (Com9), which were previously vacuum-dried at 160°C for 5 hours, were supplied to the extruder at a ratio of 41:43:16 in terms of weight (M) At the same time, the polyester resin (A) and masterbatch pellets (Com9) which were previously vacuum-dried at a temperature of 160°C for 5 hours were supplied to the extruder (S) at a ratio of 92:8 in terms of weight, After melt-extruding at a temperature of 280°C, foreign matter was filtered using a filter with a cut-off diameter of 30 μm, and then introduced into a T-die composite die. In addition, at this time, in the T-die compound die, the extruder (M) sends the resin to the inner layer of the film, and the extruder (S) sends the resin to the two outer layers of the film equally, so that Merged and extruded to form a 3-layer structure, co-extruded into a sheet form to form a molten laminated sheet, and this molten laminated sheet was bonded to a cyli...

Embodiment 2～3、 comparative example 1～3、5～7

[0155] The weight conversion ratio described in Table 1 and Table 2 was used to obtain a white film in the same manner as in Example 1. The resin ratios, thickness ratios, amounts of various additives, and physical properties and effects of the obtained films are shown in Tables 2 and 3. In addition, the film thickness of Example 2 was 225 μm.

Embodiment 4

[0157] Except having formed the 2-layer structure of A layer and B layer, it carried out similarly to Example 1, and obtained the film of 188 micrometers thickness. The resin ratios, thickness ratios, amounts of various additives, and physical properties and effects of the obtained films are shown in Tables 2 and 3.

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Abstract

The invention aims to provide a white polyester film which achieves the advantages of high reflectance, high invisibility, low film damage and high production rate comparing with the previous techniques. The white polyester film comprises a layer containing an inner cavity (layer B), which contains 3-15wt non crystalline annular olefin copolymer resin incompatible with polyesters; 2-10wt% block copolymer resin of polyalkaneneglycol and polyester resin formed by 2-6 carbon aliphatic diol component and terephthalic acid; and 5-25wt% inorganic particles. The numeral even particle diameter of the non crystalline annular olefin copolymer resin and inorganic particles are 0.4-3mum, while the maximum particle diameter is no more than 5mum.

Description

technical field [0001] The present invention relates to white polyester films. More specifically, the present invention relates to a polyester film that contains cavities inside the film, has excellent reflective properties and concealment properties, and has good productivity, and also relates to reflective sheets suitable for use in backlight devices for image display and lamp reflectors, lighting White polyester film for reflective sheets for appliances, reflective sheets for illuminated advertising boards, back reflective sheets for solar cells, etc. Background technique [0002] Because of its uniformity, high brightness, dimensional stability, and low cost, white polyester film is widely used in reflectors and reflectors of surface light source devices in flat image display methods used in liquid crystal displays, etc., and illuminated advertising boards Back reflectors for solar cells, etc. As a method of displaying high brightness, it is widely used to include a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L45/00C08K3/00C08J5/18B32B27/18B32B27/00B32B3/26G02B5/08
CPCB32B2307/702C08L67/025Y10T428/249986B32B3/26C08L65/00C08J2367/02B32B2307/71C08K3/0033B32B27/36C08L45/00C08J5/18B32B27/20B32B2307/416C08K3/013C08L2666/04C08L2666/14C08K7/18C08L67/03
Inventor 吉田达朗上田隆司宫崎太地
Owner TORAY IND INC
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