Method of producing film from polymer solution

A polymer solution and thin film technology, applied in flat products, instruments, polarizing elements, etc., can solve the problems of finished film thickness uniformity, high precision control, viewing angle change, etc., and achieve the effect of excellent optical performance

Active Publication Date: 2005-01-26
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the solution casting method, the productivity is not sufficiently improved, and the thickness uniformity of the finished film is not controlled with high precision.
In addition, when the optical properties, especially the retardation values ​​Re and Rth in birefringence are not uniform, it will greatly affect the product
For example, coloring or inversion sometimes occurs in LCDs, and when this optical compensation sheet is used in LCDs to magnify the viewing angle, sometimes the viewing angle changes and color inversion occurs

Method used

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  • Method of producing film from polymer solution
  • Method of producing film from polymer solution
  • Method of producing film from polymer solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Blend A was prepared having the following ingredients. Note that the raw material of cellulose triacetate is wood pulp, and UV-absorbers I, II, and III are 2-(2'-hydroxy-5'-tolyl)benzotriazole, 2,2'-hydroxy-4- Methoxybenzophenone, and 2(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole.

[0111] Cellulose triacetate 18.90 parts by weight

[0112] (The degree of acetylation is 60.7%, the degree of polymerization is 315, the degree of substitution of the acetyl group at the 6-position is 0.94, and the average particle diameter is 0.5mm)

[0113] Triphenyl phosphate (TPP) 1.00 parts by weight

[0114] 0.60 parts by weight of biphenyl diphenyl phosphate (BDP)

[0115] 0.50 parts by weight of diethyl phthalate

[0116] UV-absorber I 0.10 parts by weight

[0117] UV-absorber II 0.20 parts by weight

[0118] UV-absorber III 0.30 parts by weight

[0119] Silica particles 0.05 parts by weight

[0120] (Particle diameter 15nm, Mohs hardness about 7)

[0121] Pa...

Embodiment 2

[0136] (Preparation of Blend B)

[0137] Dichloromethane was used in place of the silica particles to prepare Blend B.

[0138] (Preparation of Blend C)

[0139] The content of cellulose triacetate was reduced to 17.0% by weight, and dichloromethane was added corresponding to the reduction in the content of cellulose triacetate. Blend C was thus prepared.

[0140] use Figure 7 The casting equipment shown is used for casting. The same parts and components are provided in the same number. The casting speed was 40 m / min and the casting die 14 was provided with a supply zone 14a for co-casting. In addition, a third drying unit 53 is provided downstream of the second drying unit 52 and at a position from above the second drum 33 to below the first drum 32 . Blends B and C are cast onto a belt 31 so that blend B can form a 35 μm thick main layer in the dry film and blend C can form a 2 μm thick front surface layer (the surface layer facing the drying unit ) and a 3 μm thick ...

Embodiment 3

[0144] Blend D was prepared with the following ingredients. Note that the raw material of cellulose triacetate is wood pulp and cotton linter with a mass mixing ratio of 3:7. In addition, the viscosity of a 6 mass % dichloromethane solution with a water content of 0.2 mass % was 305 mPa·s. Furthermore, the UV-absorbers IV, V, VI are in turn 2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylaniline (anylino))-1,3, 5-triazine, 2(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, and 2(2'-hydroxy-3',5'-di-tert-amyl Phenyl)-5-chlorobenzotriazole. Note that the water content of methyl acetate, acetone, methanol, and ethanol used as solvents is at most 0.2% by weight.

[0145] Cellulose triacetate 16.00 parts by weight

[0146] (The degree of acetylation is 2.83, the viscosity average degree of polymerization is 205, and the degree of substitution of the acetyl group at the 6-position is 0.96)

[0147] Triphenyl phosphate (TPP) 0.50 parts by weight

[0148] 1.50 par...

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Abstract

A blend comprising a polymer whose main component is cellulose acylate is cast on a moving belt by a method for producing a film. At least the first and second drying units are arranged along the moving direction of the belt and disposed close to the glue-like film on the belt. A temperature difference between drying air supplied in the first drying unit and exhaust air is higher than a temperature difference between drying air supplied in the second drying unit and exhaust air. In addition, in order to be used as the drying air of the second drying unit, the discharge air of the first drying unit is heated with a heat exchanger to reduce the solvent content. The finished film has excellent thickness uniformity and is suitable for use as an optical polymer film. A polarizing filter, a protective film, an optical functional film, and a liquid crystal display using the film have excellent optical properties.

Description

technical field [0001] The present invention relates to a kind of method for preparing film by polymer solution, especially the method for preparing the optical film with excellent optical performance by polymer solution, described film is used as polarizing filter in optical function film and liquid crystal display Protective film. Background technique [0002] A liquid crystal display (hereinafter referred to as LCD) is composed of a liquid crystal unit, a polarizing element, and an optical compensation sheet (birefringent sheet). In a transmissive LCD, two polarizing elements are arranged on both sides of the liquid crystal cell, and one or two optical compensation sheets are arranged between the liquid crystal cell and the polarizing element. In a reflective LCD, a reflective sheet, a liquid crystal cell, an optical compensation sheet, and a polarizing element are sequentially stacked. [0003] In products for optical applications such as LCDs, the films that make up e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C41/28B29C41/40B29D7/01B29K1/00B29L7/00B29L11/00G02F1/1335
CPCB29D7/01B29K2001/00B29K2001/12B29C41/28
Inventor 辻本忠宏
Owner FUJIFILM CORP
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