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Manufacturing method of optical film, polarizer and display device

A manufacturing method and technology of optical film, which can be applied in the directions of optics, identification devices, polarizing elements, etc., and can solve problems such as difficulty in obtaining

Active Publication Date: 2021-06-15
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the film is stretched by a normal method, since the value of the NZ coefficient becomes a value smaller than 0 or a value larger than 1, it is difficult to obtain a film with 0

Method used

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  • Manufacturing method of optical film, polarizer and display device
  • Manufacturing method of optical film, polarizer and display device
  • Manufacturing method of optical film, polarizer and display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0070] [1.1.4 Preparation method of multilayer film]

[0071] The method for producing the multilayer film used in the production method of the present invention is not particularly limited, and any method can be employed. Such preparation is performed, for example, by laminating the film (A) and the film (B). Before bonding, surface treatment such as corona treatment is performed on the film (A) and / or film (B) as necessary. In addition, before bonding, if necessary, an adhesive layer is formed on the surface of the film (A) and / or the film (B), and bonding is performed through the adhesive layer. The bonding is to align the longitudinal direction and bond the long film (A) and the long film (B) together by roll-to-roll.

[0072] [1.2. Peeling process]

[0073] In the peeling step in the production method of the present invention, the multilayer film is subjected to peeling treatment. The peeling process includes peeling the film (B) from the peeling film (A). By perform...

Embodiment

[0100] Hereinafter, an Example is shown and this invention is concretely demonstrated. However, the present invention is not limited to the examples shown below, and can be arbitrarily modified and implemented within a range not departing from the claims of the present invention and their equivalents.

[0101] In the following description, unless otherwise specified, "%" and "part" which show an amount are based on weight. In addition, unless otherwise specified, the operation demonstrated below was performed under the conditions of normal temperature and normal pressure.

[0102] [Evaluation method]

[0103] (Measuring method of glass transition temperature of resin)

[0104] Pellets of resin to be measured were prepared, and the glass transition temperature of the resin pellets was measured using a differential scanning calorimeter (manufactured by Seiko Instruments [DSC6220]). The conditions were set at a sample weight of 10 mg and a temperature increase rate of 20° C. / m...

manufacture example 1

[0110] [Manufacture example 1. Manufacture of film (A)-1]

[0111] Pellets of a resin containing a polymer having an alicyclic structure (resin of a norbornene-based polymer having a glass transition temperature of 126° C., trade name “ZEONOR” manufactured by Zeon Corporation) were dried at 100° C. for 5 hours. Thereafter, pellets of the dried resin were used in a single-screw extruder. After the resin is melted in the extruder, it passes through a polymer tube and a polymer filter, and is extruded from a T-die onto a casting drum to form a sheet and cooled. Thus, a long film (A)-1 having a thickness of 80 μm and a width of 1000 mm was obtained. The produced film (A)-1 was wound up into a roll and recovered.

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Abstract

A method for producing an optical film and a polarizing plate and a display device using the same, the method comprising a peeling step of subjecting a multilayer film to a peeling treatment, the multilayer film comprising a thermoplastic resin (A) The film (A) and the elongated multilayer film of the film (B) arranged on one or both surfaces of the film (A), the peeling treatment includes at a temperature (Tov) (° C.) to The film (B) is peeled off from the film (A) by applying a force in the thickness direction of the film (A), and the temperature (Tov) is related to the glass transition temperature (TgA) of the film (A). )(°C) satisfies the relationship of Tov≥TgA, and the shrinkage rate Xb of the film (B) is more than 0% and less than 4%, and the shrinkage rate Xb is obtained by placing the film (B) under the conditions of temperature Tov and 60 seconds Shrinkage rate in the width direction of the said film (B) when processed.

Description

technical field [0001] The present invention relates to a manufacturing method of an optical film, a polarizer and a display device. Background technique [0002] In display devices such as liquid crystal display devices, a resin optical film having a phase difference is widely provided for the purpose of optical compensation or the like. As a method of imparting a phase difference to a resin film, stretching the film is widely performed. [0003] As such an optical film, a film whose NZ coefficient Nz satisfies 0<Nz<1 is sometimes sought, preferably a film with 0.4<Nz<1, more preferably a film with Nz=0.5. However, when the film is stretched by a normal method, since the value of the NZ coefficient becomes a value smaller than 0 or larger than 1, it is difficult to obtain a film with 0<Nz<1. [0004] As a method of obtaining a film with 0<Nz<1, it is conceivable to use a multilayer film in which a plurality of films are combined. However, membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B29C55/04G02F1/1335G02F1/13363G09F9/30H01L27/32H01L51/50H05B33/02B29K45/00B29L7/00B29L9/00B29L11/00
CPCB29C55/04H05B33/02G02B5/30G02F1/1335G02F1/13363G09F9/30B29K2101/12
Inventor 摺出寺浩成
Owner ZEON CORP