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Continuous polymer film production method, polymer film, lamda/4 plate, polarizing plate, and liquid crystal display device

A technology of a polymer film and a manufacturing method, which is applied to polarizing elements, flat products, instruments, etc., can solve the problems of skew and easy breakage, and achieve the effect of suppressing the occurrence of skew or breakage

Active Publication Date: 2013-09-18
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when splicing and stretching obliquely using a conventional splicing tape, there is a problem that distortion occurs and it is easy to break due to this

Method used

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  • Continuous polymer film production method, polymer film, lamda/4 plate, polarizing plate, and liquid crystal display device
  • Continuous polymer film production method, polymer film, lamda/4 plate, polarizing plate, and liquid crystal display device
  • Continuous polymer film production method, polymer film, lamda/4 plate, polarizing plate, and liquid crystal display device

Examples

Experimental program
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Effect test

manufacture example

[0324] The raw film used in the present invention can be produced by either a solution casting film forming method or a melt casting film forming method. Hereinafter, a solution casting film forming method of a cellulose ester film will be described as a typical example.

[0325] The production of cellulose ester film is carried out through the following steps: the process of dissolving cellulose ester and additives such as the above-mentioned plasticizer in a solvent to prepare a slurry; casting the slurry on a belt-shaped or drum-shaped metal support The process of drying the flow-cast slurry as a wet film; the process of peeling off the metal support; the process of stretching; the process of further drying; the process of further heat-treating the obtained film as required; The process of winding after cooling. The cellulose ester film used in the present invention preferably contains 60 to 95% by mass of cellulose ester in solid content.

[0326] The steps of preparing ...

manufacture example 1

[0419]

[0420] (making of polyester A)

[0421] Under a nitrogen atmosphere, 4.85 g of dimethyl terephthalate, 4.4 g of 1,2-propanediol, 6.8 g of p-toluic acid, and 10 mg of tetraisopropyl titanate were mixed and stirred at 140° C. for 2 hours. It was further stirred at 210° C. for 16 hours. Next, the temperature was lowered to 170°C, and unreacted 1,2-propanediol was distilled off under reduced pressure to obtain polyester A. Polyester A uses 2 times the molar amount of monocarboxylic acid relative to dicarboxylic acid, so the terminal becomes toluate.

[0422] Acid value: 0.1

[0423] Number average molecular weight: 490

[0424] Dispersion: 1.4

[0425] Concentration of ingredients with a molecular weight of 300 to 1800: 90%

[0426] Hydroxyl value: 0.1

[0427] Hydroxyl content: 0.04%

[0428]

[0429] Microparticles (Aerosil R812 manufactured by Aerosil Japan): 11 parts by mass

[0430] Ethanol: 89 parts by mass

[0431] After stirring and mixing the above s...

manufacture example 2

[0451]

[0452] In Production Example 1, except that the cellulose ester was changed to cellulose acetate propionate having an acetyl group substitution degree of 1.5, a propionyl group of 0.9, and a total substitution degree of 2.4, the same procedure as in Production Example 1 was performed to obtain a roll-shaped Original film 2.

[0453] The average dry film thickness of the obtained raw film 2 was 76 micrometers, the thickness nonuniformity in the longitudinal direction was 0.15 micrometers, and the thickness nonuniformity in the width direction was 0.15 micrometers. In addition, the in-plane retardation value Ro(550) at a wavelength of 550nm was 10nm, and the retardation value Rt(550) in the thickness direction was 118nm.

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Abstract

Provided is a method for producing a continuous polymer film that involves: a step (1) for overlapping and bonding the rear end section of a preceding raw film and the front end section of a following raw film, along a bonding line; and a step (2) for supporting both end sections by means of a plurality of gripping tools and obliquely stretching the bonded raw film while conveying the bonded raw film in order to produce a polymer film. The oblique stretching is performed such that the angle formed between the in-plane slow axis of the polymer film obtained after oblique stretching and the width direction of the polymer film obtained after oblique stretching is within the range of 40-50 DEG . In the bond between the rear end section of the preceding raw film and the front end section of the following raw film, the angle fai(1) between the bonding line for the polymer film and the width direction of the polymer film and the angle theta(1) between the in-plane slow axis of the polymer film and the width direction of the polymer film fulfill formula (I). Formula (I):|fai(1)-theta(1)|<=10 DEG .

Description

technical field [0001] The present invention relates to a method for producing a long polymer film capable of continuous oblique stretching while suppressing occurrence of distortion or breakage, and to a long polymer film produced by the production method. Background technique [0002] Various polymer films for optical applications are currently mostly produced by solution or melt casting film forming methods. In the solution casting film-forming method, basically, the slurry is cast on a support using a casting die to form a cast film, which is then peeled off from the support and then dried to form a film. Also, the obtained film was wound into a core and made into a film roll. [0003] In addition, in this production method, in order to improve the thickness, planarity, mechanical strength, optical characteristics, etc. of the film, a step of longitudinally stretching or transversely stretching the film is generally provided. [0004] However, when a polymer film funct...

Claims

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Application Information

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IPC IPC(8): B29C55/04B29C65/08G02B5/30G02F1/1335G02F1/13363B29L7/00B29L11/00
CPCB29C55/045B29C65/02B29C65/08B29C65/16B29C65/18B29C65/4895B29C65/50B29C66/1122B29C66/344B29C66/43B29C66/43129B29C66/71B29C66/7234B29C66/7338B29C66/73921B29C66/836B29C66/91421B29C66/91431B29C66/9513B29C66/9517B29K2995/0034G02B5/3083G02F1/133638B29K2069/00B29K2067/00B29K2081/06B29K2079/08B29K2023/00B29K2067/003B29K2033/12B29K2023/06B29K2001/12B29K2033/08B29K2027/06B29K2023/38B29K2001/08B29C55/04C08J5/18G02B5/30G02F1/1335B29D7/01G02B5/3025
Inventor 木暮翠田中武志
Owner KONICA MINOLTA INC
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