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Process for producing thermoplastic resin film

A thermoplastic resin film and thermoplastic resin technology, applied in the field of film preparation and thermoplastic resin film preparation, can solve the problems of increasing viscosity, difficult film flattening, lowering temperature, etc., and achieve the effect of reducing thickness change and delay change, and multi-delay

Active Publication Date: 2010-03-31
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, a disadvantage of melt film formation is that the film exiting the die has a reduced temperature and increased viscosity before reaching the chill roll, making it difficult to flatten the film

Method used

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  • Process for producing thermoplastic resin film
  • Process for producing thermoplastic resin film
  • Process for producing thermoplastic resin film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0092] The thickness of the optical film produced by the production method of the present invention is not particularly limited, and if the film is used for a liquid crystal display or the like, the thickness is preferably between 20 μm or more and 100 μm or less, more preferably between 30 μm or more and 80 μm or less, and more preferably It is preferably between 40 μm and 60 μm. According to the production method of the present invention, such a thin film can be produced, and further, when the resin is discharged from the die, cooled and solidified, and formed into a film, retardation in the thickness direction can be allowed to occur.

[0093] When the film is used in a liquid crystal display, changes in Re(0°), Re(40°) and Re(-40°) lead to display changes, so smaller changes among them are more preferable. Specifically, the variation is preferably within ±3 nm, and more preferably within ±1 nm. In addition, changes in the angle of the slow axis similarly cause display cha...

Embodiment 1

[0164] exist image 3 In the melt film forming step shown in , touch roll film formation is used in which the film 12A in a high-temperature molten state discharged from the die 16 is dropped between the casting roll 18 and the touch roll 28 using the touch roll method center of the nip. The air gap (molten resin film) between the casting roll 18 and the touch roll 28 was heated with the heater heating unit 25 to test how to improve the surface condition of the film 12A.

[0165] Here, in the touch roll film formation, the touch roll 28 means a roll whose contact length with the film 12 is short, and the casting roll 18 means a roll whose contact length with the film 12 is long.

[0166] When the film 12A is in its final shape, the film thickness of the film 12A is made 60 μm and the width after trimming off the ends is 1,500 mm, and as a raw material, a cycloolefin copolymer (hereinafter also referred to as COC) is used. The glass transition temperature Tg of the cycloolefi...

Embodiment 2

[0179] The test conditions were the same as in Example 1 except that the nip pressure was set at 50 MPa.

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Abstract

The present invention provides a process for producing a thermoplastic resin film, comprising: a feeding step of feeding a molten resin containing a thermoplastic resin from a feeding device; a heating step of heating the molten resin from a discharge opening of the feeding device to a nip portion between a first compression surface and a second compression surface that are included in a compression apparatus by using a heating apparatus; and a film formation step of continuously compressing the heated molten resin between the first compression surface and the second compression surface to form a film, wherein a pressure applied to the molten resin by the compression apparatus is between 20 MPa or more and 500 MPa or less.

Description

technical field [0001] The present invention relates to a method for producing a thermoplastic resin film, and in particular, to a film production technique by which a thermoplastic resin film is used for optical applications such as liquid crystal display devices. Background technique [0002] Thermoplastic resins such as cellulose resins and cycloolefin resins are widely used in films for optical applications. In particular, films made of cellulose resins or cycloolefin resins are used for optical films of liquid crystal display devices due to their transparency, toughness and optical isotropy. [0003] A method for producing a thermoplastic resin film is a method in which molten thermoplastic resin is discharged from a die in the form of a film, and the discharged film is cooled and solidified with a plurality of cooling rolls, such as melt film formation. The unoriented thermoplastic resin film thus produced is used, for example, as a protective film of a liquid crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/22B29C43/32B29C43/58B29C43/24B29C43/34B29L7/00B29C48/08B29C48/53B29C48/91
CPCB29C47/6018B29C47/60B29C2043/3433B29C2043/468B29C47/0073B29C47/0021B29C2035/0822B29C47/0057B29C2043/463B29C43/24B29C43/222B29L2031/3475B29L2011/00B29D11/00B29L2011/0016B29L2007/002B29C48/08B29C48/0018B29C48/141B29C48/53B29C48/91B29C48/914
Inventor 则常雅彦
Owner FUJIFILM CORP