Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cellulose acylate film and method for producing same, and retardation film, polarizer and liquid crystal display device comprising the film

A technology of cellulose acylate and cellulose, which is applied in the direction of polarizing elements, flat products, and other household appliances, can solve the problems of consumption of heat-shrinkable films, unstable film quality, and increased preparation steps, so as to achieve reduced fluctuations, The effect of excellent transparency and high reliability

Active Publication Date: 2009-04-01
FUJIFILM CORP
View PDF39 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this method is that the preparation steps are increased and the quality of the obtained film is not stable
However, these methods have a problem in that a large amount of heat-shrinkable film is consumed and the quality of the film obtained changes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cellulose acylate film and method for producing same, and retardation film, polarizer and liquid crystal display device comprising the film
  • Cellulose acylate film and method for producing same, and retardation film, polarizer and liquid crystal display device comprising the film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0078] As for the production method of cellulose acylate, its basic principle is described in Wood Chemistry by Nobuhiko Migita et al., pp. 180-190 (Kyoritsu Publishing, 1968). A representative method for producing cellulose acylate is a liquid-phase acylation method using a carboxylic anhydride-carboxylic acid-sulfuric acid catalyst. Specifically, cellulose raw materials such as cotton pulp or wood pulp are pretreated with an appropriate amount of carboxylic acid such as acetic acid, and then placed in a pre-cooled acylation mixture for esterification, thereby preparing complete cellulose acylate (2- , 3- and 6-positions of the acyl total substitution degree is close to 3.00). The acylation mixture generally contains a carboxylic acid as a solvent, a carboxylic anhydride as an esterification agent, and sulfuric acid as a catalyst. Typically, the amount of carboxylic anhydride used in the process is in stoichiometric excess relative to the total amount of water present in the...

Embodiment 101-118

[0229] [Example 101-118, Comparative Example 101-103]

[0230] (preparation of polymer solution)

[0231] 1) Cellulose acylate:

[0232] In each of Examples and Comparative Examples, cellulose acylate A to F described later was used according to Table 1. Each cellulose acylate was heated and dried at 120°C so that the water content was 0.5% by mass or less. After that, 15 parts by mass of cellulose acylate was used.

[0233] Cellulose acylate A:

[0234] Cellulose acetate powder from pulp with a degree of substitution of 2.91 was used. The viscosity-average degree of polymerization of cellulose acylate A was 270, and the degree of substitution of 6-acetyl group thereof was 0.93. The average diameter of the powder particles is 1.5 mm with a standard deviation of 0.5 mm.

[0235] Cellulose acylate B:

[0236] Cellulose acetate powder from pulp with a degree of substitution of 2.94 was used. The viscosity-average degree of polymerization of cellulose acylate B was 300, an...

Embodiment 151

[0299] (re-stretching of film)

[0300] The stretching was carried out by holding both ends of the cellulose acylate film in Example 113 with tenter clips to stretch the film in a direction perpendicular to the conveying direction in the heating zone. The temperature in the heating zone was 160°C and the draw ratio was 25%. The stretching ratio of the film was obtained according to the following formula in such a manner that the gauge lines of the film were set at constant intervals in a direction parallel to the conveying direction of the film, and the interval was measured before and after stretching.

[0301] Stretch ratio of the film (%) = 100 × {(the distance between the ruler and gauge lines after stretching)-(the distance between the ruler and gauge lines before stretching)} / the distance between the ruler and gauge lines before stretching

[0302] Re and Rth values ​​of the obtained thin film were measured, whereby Re = 160 nm and Rth = -2 nm were obtained. The slow p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

A cellulose acylate film satisfying Re = 40 is produced by transporting a cellulose acylate film having a substitution degree of acyl substituted for hydroxyl group of cellulose of 2.88 or higher, and subjecting the film to heat treatment at 160 DEG C or higher.

Description

technical field [0001] The present invention relates to a cellulose acylate film having optical anisotropy and capable of being directly bonded to a polarizer and a method for producing the same, and also relates to a retardation film, a polarizing plate, and a liquid crystal using the cellulose acylate film display device. Background technique [0002] Polymer films represented by cellulose ester, polyester, polycarbonate, cycloolefin polymer, vinyl polymer or polyimide are used in silver halide photographic photosensitive materials, retardation films, polarizers and image display devices middle. Since films superior in surface smoothness and uniformity can be produced from these polymers, they are widely used for optical films. [0003] Among them, a cellulose ester film having suitable moisture permeability can be directly bonded to the most commonly used polarizer made of polyvinyl alcohol (PVA) / iodine in an on-line manner. Therefore, cellulose acylate, especially cel...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18G02F1/13363B29C41/24B29K1/00G02B5/30B29L7/00G02F1/1335B29L11/00
CPCB29C41/26G02F2202/40B29K2995/0034C08J5/18B29K2001/00B29K2001/12B29C55/08C08J2301/10
Inventor 佐佐田泰行
Owner FUJIFILM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com