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Manufacturing method of thermoplastic film

A thermoplastic film, thermal relaxation technology, applied in the field of thermoplastic film preparation, can solve problems such as delay, achieve the effect of eliminating strain and improving dimensional stability

Active Publication Date: 2008-11-12
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The reason for the bowing phenomenon is that the middle part of the film is less restrained by the clamps than the edges of the film held by the clamps, therefore, there is a delay in the continuous stretching process.

Method used

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  • Manufacturing method of thermoplastic film
  • Manufacturing method of thermoplastic film
  • Manufacturing method of thermoplastic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0296] [Cellulose Acylate Resin]

[0297] In the production of cellulose acylate, sulfuric acid (7.8 parts by weight per 100 parts by weight of cellulose) was added as a catalyst, and carboxylic acid as a raw material of an acyl substituent was added, and acylation was performed at 40°C. By adjusting the type and amount of carboxylic acid added, the type and degree of substitution of the acyl group can be adjusted. After acylation, aging was performed at 40°C.

[0298] [melt film formation]

[0299] The cellulose acylate resin was formed into cylindrical pellets with a diameter of 3 mm and a length of 5 mm. In this operation, a plasticizer is selected from those described below, and kneaded into the pellets. The pellets were dried in a vacuum dryer at 110°C so that their moisture content was 0.1% or less, and after adjusting their temperature to Tg - 10°C, they were fed into a hopper. The plasticizer is selected from the following: TPP: triphenyl phosphate, BDP: biphenyl d...

Embodiment 5

[0308]In Example 5, the temperature of the cooling zone is lower than that of the cooling zone in Example 1, and in Example 6, the temperature of the cooling zone is higher than that of the cooling zone in Example 1. Good results are always obtained even when the temperature in the cooling zone varies in the temperature range below Tg.

[0309] In Example 7, compared with those in Example 1, the degrees of substitution of the acyl groups were: A = 0.1 and B = 2.85. This confirms that even when the degree of substitution of the acyl group is varied in the ranges of 2.0≤A+B≤3.0, 0≤A≤2.0 and 1.2≤B≤2.9, in Re, Rth appear properties, percentage of dimensional change caused by heating Good results are also always obtained with respect to curved and arcuate bends. In Example 8, the degree of substitution of the acetyl group was: A=0.7, while the degrees of substitution of the propionyl, butyryl, pentanoyl and hexanoyl groups were each 0.5, and their sum was 2.0. This confirms that ...

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Abstract

The present invention provides a method for producing a thermoplastic film which makes it possible to improve the optical properties of the thermoplastic film obtained by stretching and a thermoplastic film manufactured thereby. The transverse stretching section in which a cellulose acylate film is transversely stretched includes: a preheating zone, a transverse stretching zone, a cooling zone and a thermal relaxation zone, and the cellulose acylate film having been cooled in the cooling zone is immediately subjected to thermal relaxation treatment in the thermal relaxation zone.

Description

technical field [0001] The present invention relates to a method for preparing a thermoplastic film, in particular to a method for preparing a thermoplastic film for a liquid crystal display. Background technique [0002] Conventionally, a thermoplastic film is stretched to present in-plane retardation (Re) and thickness-direction retardation (Rth), and is used as a retardation film of a liquid crystal display element to increase a viewing angle. [0003] As a method of stretching this type of thermoplastic film, there are known: a method of stretching in the longitudinal direction (longitudinal stretching), a method of stretching in the transverse (width) direction (transverse stretching), and A method of simultaneous stretching in the longitudinal and transverse directions (continuous biaxial stretching). [0004] Of these, in continuous biaxial stretching, the film is heated to a temperature higher than the glass transition temperature (Tg), and the conveyance speed of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/08B29L7/00
CPCB29C55/08B29K2001/00B29K2023/38B29K2001/12B29L2007/00
Inventor 中居真一大岁正明藤田昭秀
Owner FUJIFILM CORP
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