Polyester resin for thermoformed optical film and biaxially oriented polyester film obtained from the same

A polyester resin and optical film technology, applied in optics, optical components, instruments, etc., can solve the problems of difficulty in forming high-definition patterns, low heat resistance, poor formability, etc., and achieve excellent transparency and thermoformability Effect

Active Publication Date: 2011-01-26
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PC has excellent heat resistance, but poor formability, it is difficult to form high-definition patterns, and there are problems such as residual optical distortion after molding
On the other hand, there are examples of PMMA that can form a high-definition and high-aspect-ratio structure by reducing the molecular weight, but it lacks mechanical strength and is brittle as a sheet, so there are problems in practical use
[0007] In addition, polyester is a promising material because of its excellent cost, mechanical strength, and melt-film-forming properties. However, polyethylene terephthalate (PET) has a high Tm and poor formability due to its crystallinity. Mold temperature must be increased for molding, 1. Mold heating, 2. Imprint molding, 3. Mold cooling, 4. Mold peeling cycle takes a long time, low productivity, and low Tg, so it has low heat resistance The problem

Method used

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  • Polyester resin for thermoformed optical film and biaxially oriented polyester film obtained from the same
  • Polyester resin for thermoformed optical film and biaxially oriented polyester film obtained from the same
  • Polyester resin for thermoformed optical film and biaxially oriented polyester film obtained from the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] According to the ratio of 86.2 parts by weight dimethyl terephthalate, 14.8 parts by weight 2,6-dimethyl naphthalene dicarboxylate, 62.6 parts by weight of ethylene glycol (2 times the mole of the dicarboxylic acid composition) The monomer is added to the transesterification reaction device, the content is melted at 150°C, and then 0.06 parts by weight of magnesium acetate tetrahydrate, 0.02 parts by weight of antimony trioxide, and 0.003 parts by weight of lithium acetate dihydrate are added as catalysts, Stir.

[0155] The temperature was raised to 190°C over 60 minutes, the temperature was raised to 200°C over 60 minutes, and methanol was distilled off while raising the temperature to 240°C over 90 minutes. After a predetermined amount of methanol was distilled off, an ethylene glycol solution containing 0.04 parts by weight of triethyl phosphonoacetate was added as a deactivator for the catalyst, and stirred for 5 minutes to terminate the transesterification reactio...

Embodiment 2

[0163] Except having changed the copolymerization composition ratio, it carried out similarly to Example 1, and obtained the polyester resin. IV, solution turbidity, and thermal properties of the obtained polyester resin are shown in Table 1.

[0164] A three-layer laminated film was obtained in the same manner as in Example 1 except that this polyester resin was used as a sublayer, and then a thermoformed molded article was obtained. Table 1 shows the results of the 85°C brightness retention of the obtained molded articles.

Embodiment 3

[0166] Except having changed the copolymerization composition ratio, it carried out similarly to Example 1, and obtained the polyester resin. IV, solution turbidity, and thermal properties of the obtained polyester resin are shown in Table 1.

[0167] A three-layer laminated film was obtained in the same manner as in Example 1 except that this polyester resin was used as a sublayer, and then a thermoformed molded article was obtained. Table 1 shows the results of the 85°C brightness retention of the obtained molded articles.

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Abstract

A polyester resin composition characterized by having a glass transition temperature (Tg) of 83 DEG C or higher and a melting point (Tm) of 230 DEG C or lower and having controlled crystallizability. This polyester has excellent surface thermoformability. In particular, the surface of the polyester can be formed into various shapes, e.g., a shape having ultrahigh fineness or a high aspect ratio. The polyester is for use as a thermoformed optical film excellent in heat resistance and transparency.

Description

technical field [0001] The present invention relates to a polyester for thermoforming optical films that is excellent in thermoformability to the surface, can be formed into various shapes such as ultra-high definition and high aspect ratio, and is excellent in heat resistance and transparency. Background technique [0002] Conventionally, glass with excellent transparency and low birefringence has been often used for optical elements. However, glass has poor formability and it is difficult to achieve weight reduction. Therefore, according to the characteristics, polymer materials with excellent formability, light weight, and easy property control have recently been used in optical disk substrates, lenses, cables, and films for various displays. . [0003] On the other hand, in recent years, centering on the field of optics, the importance of techniques for forming fine surface structures has been increasing. Photolithography is a representative technology of fine processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C59/00G02B5/04
CPCB29C2059/023B29C59/022G02B1/04B29K2067/00
Inventor 旦浩一坂本纯高桥宏光高桥弘造尾形大辅
Owner TORAY IND INC
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