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Polymer film and solution film forming method

A polymer film, polymer technology, applied in flat products, applications, coatings, etc., can solve the problems of high cost and complex structure, and achieve the effect of widening the viewing angle and excellent optical isotropy

Inactive Publication Date: 2008-09-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore the structure becomes complicated and the cost for the device becomes higher

Method used

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  • Polymer film and solution film forming method
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  • Polymer film and solution film forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0314] Embodiments of the present invention are explained. However, the present invention is not limited to this embodiment. In the Examples, Experiments 1-21 were performed. Experiment 1 of the present invention was explained in detail, and the same explanations of Experiments 2-17 of the present invention and Experiments 18-21 as comparisons were omitted. In addition, the conditions and results of the test are shown in Tables 1 and 2, respectively.

[0315] (preparation of primary paint)

[0316] Cellulose triacetate 89.3% by weight

[0317] (degree of substitution, 2.8)

[0318] Triphenyl phosphate 7.1% by weight

[0319] Diphenyl diphenyl phosphate 3.6% by weight

[0320] To these solid materials was added a mixed solvent of the following compounds:

[0321] Dichloromethane 87% by weight

[0322] Methanol 13% by weight

[0323] The mixture of the solid material and the mixed solvent was stirred for dissolution to obtain a primary dope 16 in which the content of th...

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Abstract

A dope containing TAC is cast onto a belt. When having self-supporting properties, the dope is peeled as a wet film (46) from the belt, and transported into a tenter dryer (60). A preheating is made in an entrance section (80), and a stretching is made in a stretching section (81). In a relaxation section (82), the width of the film was becomes shorter, and in the exit section (83), the width was kept to be uniform and transported from the tenter dryer (60) as a film (61). When a width of the wet film (46) right before the stretching is L1 (mm), a maximum width of the wet film (46) in the stretching is L2 (mm) and a width of the wet film (46) right after the relaxation is L3 (mm), the stretching and relaxation are performed so as to satisfy a following formula, 3<(L2-L3) / L1x100<9.

Description

technical field [0001] The present invention relates to a polymer film and a solution casting method for preparing the polymer film. Background technique [0002] Polymers are used in several ways. For example, a film is prepared from cellulose acylate (hereinafter referred to as TAC) and used as a base film for a photosensitive material or a protective film for a polarizing filter in a liquid crystal display (LCD). As a known method for producing a polymer film, there are a melt-extrusion method in which a polymer is melted by heating and extrusion thereof is performed to obtain a film; and a solution casting method in which a polymer containing polymer, A dope of a solution or the like is cast and the dope is cast to obtain a film. The film obtained in the solution casting method has excellent optical isotropy, and thus the film is used as an optical film (Japan Institute of Invention and Innovation (JIII) JOURNAL of Publication No. 2001-1745). [0003] Considering seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/08B29C41/24C08J5/18G02B5/30B29K1/00B29L7/00B29L11/00C08L1/26
CPCB29C41/24B29C55/08B29D7/01B29K2001/00B29K2001/12C08J5/18C08J2301/10C08L1/10C08L1/12G02B5/30
Inventor 宫地洋史
Owner FUJIFILM CORP