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Removable polyester film

A technology of polyester film and demoulding, which is applied in thin material processing, layered products, transportation and packaging, etc. It can solve the problems of easy omission of observation defects, easy omission of observation foreign objects, obstacles of cross polarizing method inspection, etc., and achieve transparency Good performance and excellent appearance

Inactive Publication Date: 2007-08-08
MITSUBISHI POLYESTER FILM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, a polyester film with a release layer provided on a polarizing plate via an adhesive layer is used, and the polyester film is sandwiched between two polarizing plates to perform cross-polarization inspection in this state. In the case of molded polyester film, there may be problems with the inspection of the crossed polarizer, contamination of foreign matter, or failure to observe defects easily.
[0016] In this case, when a polyester film is sandwiched between two polarizing plates, a method for improving the inspection performance when the retardation value is within a certain range is disclosed (see Patent Document 2). However, even with these methods , is also problematic in cases where inspections for reliably finding defects are implemented
[0017] In addition, when the transparency of the release film is insufficient, foreign matter mixed in the product is easily overlooked, and there is a problem that the outflow rate of defective products increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0122] Mix polyester (A1) chips and polyester (B1) chips in proportions of 95 parts by weight and 5 parts by weight, and melt and extrude the mixed raw materials with a twin-screw extruder with a vent at 290°C , cooled and solidified on a cooling roll with a surface temperature set at 40° C. using an electrostatic bonding method to obtain an unstretched sheet. Then, it was stretched 3.7 times in the longitudinal direction at 83°C, then introduced into a tenter, stretched 3.9 times in the transverse direction at 110°C, and then heat-treated at 220°C to obtain a polyester film with a thickness of 25 μm. The amount of oligomers in the obtained film was 0.64% by weight, and the contents of antimony, titanium, and phosphorus elements were 0 ppm (below the detection lower limit), 5 ppm, and 50 ppm, respectively. The following Tables 6 and 7 show the oligomer content, antimony, titanium, and phosphorus element content and evaluation results in the films obtained in each of the Exampl...

Embodiment 1-2

[0124] In Example 1-1, polyester (A2) chips with an intrinsic viscosity of 0.68 were obtained by changing the solid phase polymerization time in the same manner as polyester (A1) chips with the obtained polyester (A0) chips. A polyester film was obtained in the same manner as in Example 1-1, except that the polyester (A2) chip was used instead of the polyester (A1) chip used in Example 1.

Embodiment 1-3

[0126] In addition to only using polyester (A1) chips to replace the polyester (A1) chips used in Example 1-1 and the polyester (B1) chips mixed with 95 parts by weight, 5 parts by weight of the raw materials, with the same embodiment 1-1 The same method is used to obtain a polyester film.

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Abstract

The present invention relates to a release polyester film, a release polyester film for protecting a liquid crystal display panel, a polyester film for a protective film and a polyester film for an optical film which each include a polyester layer containing a titanium compound and a phosphorus compound in amounts satisfying the following formulae (1) and (2) at the same time; as well as a polyester film for a release film which includes a polyester layer containing a titanium compound and a phosphorus compound in amounts satisfying the following formulae (1) and (2) at the same time in which a change in an orientation angle in the film is not more than 3 / 500 mm, 0 < W Ti <= 20...(1), 1<=W P<= 300...(2) wherein W Ti represents a content (ppm) of a titanium element in the polyester layer; and W P represents a content (ppm) of a phosphorus element in the polyester layer.

Description

technical field [0001] The present invention relates to a polyester film for mold release. Specifically, the polyester film can be used in various applications such as ceramic mold release. The amount of oligomers is also very small, and it can be used for the protection of liquid crystal display panels such as polarizers and retardation plates. It has good transparency and is suitable for protective films used in optical applications such as liquid crystal polarizers and displays. It is used as an optical film In the case of , the appearance is particularly excellent, and accurate inspection can be performed in the inspection of the polarizing plate by the Cross-Nicol method. Background technique [0002] Polyester films represented by polyethylene terephthalate or polyethylene naphthalate have excellent mechanical strength, dimensional stability, flatness, heat resistance, chemical resistance, optical properties, etc., and are excellent in cost performance, and are used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/85B32B27/36
CPCB32B17/10018C08K3/32C08K3/22B32B27/20B32B27/36Y10T428/256C08L67/02C08J5/18B32B27/00C08G63/85B32B2367/00B32B27/18
Inventor 铃木加苗三木崇利池山孝一
Owner MITSUBISHI POLYESTER FILM