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Polyester film for release film for polarizer and layered product with improved polarizing property

A polarizing plate and release film technology, applied in the direction of polarizing elements, applications, coatings, etc., can solve the problems of difficult to find polarizing plate defects, missed inspections, etc.

Inactive Publication Date: 2010-12-15
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, since the polarizing plate placed under it is inspected through the release film, if the release film is extremely white, it may be difficult to find defects in the polarizing plate, and it may be easy to miss inspections.

Method used

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  • Polyester film for release film for polarizer and layered product with improved polarizing property
  • Polyester film for release film for polarizer and layered product with improved polarizing property
  • Polyester film for release film for polarizer and layered product with improved polarizing property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a～6a

[0090] Embodiment 1a~6a and comparative example 1a~3a:

[0091]

[0092] Using 100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol as starting materials, add magnesium acetate tetrahydrate as a catalyst in the reactor, set the reaction initiation temperature to 150°C, and distill off Methanol was added, and the reaction temperature was gradually increased, reaching 230°C after 3 hours. After 4 hours, the transesterification reaction was substantially completed. After adding triethyl phosphate (ethyl acid phosphate) to this reaction mixture, it moved into the polycondensation tank, added 0.04 parts of antimony trioxide, and carried out polycondensation reaction for 4 hours. That is, the temperature was gradually raised from 230°C to 280°C. On the other hand, the pressure was gradually reduced from normal pressure to finally reach 0.3 mmHg. After the reaction started, the reaction was stopped at a time corresponding to an intrinsic viscos...

Embodiment 1b～6b and comparative example 1b～3b

[0107]

[0108] Using 100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol as starting materials, add magnesium acetate tetrahydrate as a catalyst in the reactor, set the reaction initiation temperature to 150°C, and distill off Methanol was added, and the reaction temperature was gradually increased, reaching 230°C after 3 hours. After 4 hours, the transesterification reaction was substantially completed. After adding triethyl phosphate to this reaction mixture, it moved into the polycondensation tank, added 0.04 part of antimony trioxide, and performed polycondensation reaction for 4 hours. That is, the temperature was gradually raised from 230°C to 280°C. On the other hand, the pressure was gradually reduced from normal pressure to finally reach 0.3 mmHg. After the reaction started, the reaction was stopped at a time corresponding to an intrinsic viscosity of 0.63 due to a change in the stirring power of the reaction tank, and the poly...

Embodiment 1c～6c

[0124] Embodiment 1c~6c and comparative example 1c~3c:

[0125]

[0126] Using 100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol as starting materials, add magnesium acetate tetrahydrate as a catalyst in the reactor, set the reaction initiation temperature to 150°C, and distill off Methanol was added, and the reaction temperature was gradually increased, reaching 230°C after 3 hours. After 4 hours, the transesterification reaction was substantially completed. After adding triethyl phosphate to this reaction mixture, it moved into the polycondensation tank, added 0.04 part of antimony trioxide, and performed polycondensation reaction for 4 hours. That is, the temperature was gradually raised from 230°C to 280°C. On the other hand, the pressure was gradually reduced from normal pressure to finally reach 0.3 mmHg. After the reaction started, the reaction was stopped at a time corresponding to an intrinsic viscosity of 0.63 due to a chang...

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Abstract

A polyester film is provided which is suitable for use as the base film of a release film. When a polarizer having the release film adherent thereto is visually inspected for defects such as a strain and unevenness and for a foreign substance by the crossed Nicol's method, the film can render a high degree of inspection accuracy possible. The polyester film for a release film for use in a polarizer is characterized by having a haze of 7-18% and an L value as determined by the reflection method of 77 or less.

Description

technical field [0001] The present invention relates to a polyester film for a release film for a polarizing plate and a laminate having improved polarization characteristics. Specifically, the present invention relates to a film having excellent optical properties and being used in film inspection as an important characteristic of a film for liquid crystal display applications, etc. A polyester film for a release film for a polarizing plate capable of obtaining a high degree of accuracy in detection of defects in a polarizing plate, and a laminate having improved polarization characteristics by having the polyester film for a release film for a polarizing plate. Background technique [0002] Polyester films represented by polyethylene terephthalate and polyethylene naphthalate have excellent mechanical strength, dimensional stability, flatness, heat resistance, chemical resistance, optical properties, etc. characteristics, and excellent cost performance, so it is used in va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B32B27/36G02B5/30
CPCB29C37/0075C08J5/18G01N21/88B32B27/08B29C55/143C08J2367/02B29K2067/00B32B27/36G02B5/3033B29C33/68B32B7/06B32B7/12B32B27/06B32B27/18B32B27/20B32B2255/10B32B2255/26B32B2264/102B32B2264/104B32B2270/00B32B2307/306B32B2307/40B32B2307/416B32B2307/42B32B2307/50B32B2307/518B32B2307/538B32B2307/714B32B2307/734B32B2457/202G01N2021/8848Y10T428/24355
Inventor 铃木加苗
Owner MITSUBISHI PLASTICS INC
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