Biaxially oriented polyethylene terephthalate film

A technology of polyethylene terephthalate film and polyethylene terephthalate, which is applied in printed circuits, applications, instruments, etc., can solve problems such as thermal dimensional stability and large curling, and achieve Excellent processing adaptability, small curl, and small dimensional change

Inactive Publication Date: 2013-08-14
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the flexibility of electronic devices, plastic films are used instead of glass used as conventional substrates, but thermal dimensional stability and curlability due to thermal expansion and thermal contraction have become major issues

Method used

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  • Biaxially oriented polyethylene terephthalate film
  • Biaxially oriented polyethylene terephthalate film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0135] Embodiments of the present invention will be described based on examples.

reference example 1

[0137] 194 parts by mass of dimethyl terephthalate and 124 parts by mass of ethylene glycol were put into the transesterification apparatus, and the contents were heated to a temperature of 140° C. to dissolve them. Then, stirring the contents, 0.3 parts by mass of magnesium acetate tetrahydrate and 0.05 parts by mass of antimony trioxide were added, and a transesterification reaction was performed while methanol was distilled off at a temperature of 140 to 230°C. Next, 1 part by mass of a 5 mass % ethylene glycol solution of trimethyl phosphate was added (0.05 part by mass as trimethyl phosphate). When an ethylene glycol solution of trimethyl phosphate is added, the temperature of the reaction content decreases. Therefore, stirring was continued until the temperature of the reaction content returned to a temperature of 230° C. while distilling off excess ethylene glycol. In this way, after the temperature of the reaction contents in the transesterification reaction apparatus...

Embodiment 1

[0139] In an extruder heated to a temperature of 280°C, the PET pellet X obtained in Reference Example 1 with an intrinsic viscosity of 0.65 0.65 It was supplied after being dried under reduced pressure at a temperature of 180°C for 3 hours, and introduced into a T-die die under a nitrogen atmosphere. Next, extrude from the T-shaped die in a sheet form to form a molten single-layer sheet, and use an electrostatic application method to carry out close cooling and solidification on a drum that maintains a surface temperature of 25°C to obtain an unstretched single-layer film .

[0140] Next, after preheating the obtained unstretched single-layer film with a heated roll set, perform 4.3-fold MD stretching at a temperature of 88° C., and cool it with a roll set at a temperature of 25° C. to obtain uniaxial stretching. membrane. Both ends of the obtained uniaxially stretched film were introduced into a preheating zone at a temperature of 95° C. in a tenter while being held by cli...

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Abstract

The present invention provides a biaxially oriented polyethylene terephthalate film which has minimal curling, has superior suitability for machining, and is an ideal base material film, and whereby dimensional changes in various steps can be reduced particularly when the film is used as a base material film for a flexible device. This biaxially oriented polyethylene terephthalate film is made using at least a polyethylene terephthalate resin, wherein the average ((nMD + nTD) / 2) of the refractive index nMD in the length direction of the film and the refractive index nTD in the width direction thereof is 1.655-1.70, and the refractive index nZD in the thickness direction of the film is 1.490-1.520.

Description

technical field [0001] The present invention relates to a biaxially oriented polyethylene terephthalate film excellent in thermal dimensional stability. The biaxially-oriented polyethylene terephthalate film of this invention can be used suitably for the base film for flexible devices, etc. The biaxially oriented polyethylene terephthalate film of the present invention can be obtained especially as an organic EL (EL is an abbreviation for electroluminescence.) Display, electronic paper, organic EL lighting, organic solar cell and dye When used as a substrate film for a sensitized solar cell, it exhibits small dimensional changes in various processes (good thermal dimensional stability), small curl, and excellent processing suitability. Background technique [0002] In recent years, various electronic devices are required to be lightweight, thinner, and have a degree of freedom in shape, etc., and flexibility has attracted attention. For the flexibility of electronic device...

Claims

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Application Information

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IPC IPC(8): B29C55/12B29L7/00H05K1/03B29K67/00
CPCH05K2201/0145H05K1/0393B29K2067/003B29C55/143G02B1/04B29K2995/0032B29C55/12C08J5/18C08J2367/02Y10T428/24942H05K1/03
Inventor 高桥健太堀江将人东大路卓司町田哲也
Owner TORAY IND INC
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