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Manufacturing method of polarizing laminated film

A manufacturing method and a technology for laminating films, which can be used in polarizing elements, flat products, nonlinear optics, etc., and can solve the problem of narrowing the width of the coil

Inactive Publication Date: 2016-08-24
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the free end longitudinal uniaxial stretching is performed, the width of the coil may be significantly narrowed due to the natural neck-in in the width direction.

Method used

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  • Manufacturing method of polarizing laminated film
  • Manufacturing method of polarizing laminated film
  • Manufacturing method of polarizing laminated film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0127] Under the conditions described in Table 1, the stretching process of (4) was performed on the laminated films of Examples 1 to 3 produced by implementing the above-mentioned steps (1) to (3), and the edges were shrunk in the direction of travel. Stretches widthwise. As a result, almost no ear-shaped overstretched portions are formed during stretching, and stretching can be performed well without breaking.

Embodiment 4

[0129] In place of (1) above, a 180 μm film produced by melt extrusion of a cycloolefin polymer-based resin (glass transition temperature Tg of 135° C.) was used as the base film. In the same manner, the steps (2) and (3) were implemented to produce the laminated film of Example 4. Under the conditions described in Table 1, the stretching step (4) was implemented on the laminated film of Example 4 produced in this way, and it stretched in the width direction while shrinking in the advancing direction. As a result, almost no ear-shaped overstretched portions are formed during stretching, and stretching can be performed well without breaking.

Embodiment 5

[0146] Using the stretched laminated film obtained in Example 2, the above-mentioned steps (5) and (6) were implemented to produce a polarizing plate of Example 5. The obtained polarizing plate had no unevenness and was relatively uniform. Moreover, the single transmittance and polarization degree were measured about the obtained polarizing plate using the ultraviolet-visible spectrophotometer V-7100 (made by JASCO Corporation). The results are shown in Table 3.

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Abstract

The present invention relates to a method for producing a polarizing laminated film, which includes a transverse stretching step and a dyeing step. The transverse stretching step is to clamp both ends in the width direction of a traveling laminated film with a plurality of jigs arranged in the traveling direction. In the stretching zone, the laminated film is stretched in the width direction by enlarging the distance between the clamps in the width direction while moving the clips together with the laminated film, and the laminated film is stretched in the direction of travel by reducing the distance between the clips in the traveling direction. In the shrinking process, the distance between clamps in the traveling direction when entering the stretching zone is 50 to 100 mm, the distance between clamps in the traveling direction when leaving the stretching zone is 50 mm or less, and the width of each clamp is 40 mm or less.

Description

technical field [0001] The present invention relates to a method for producing a polarizing laminated film and a method for stretching the laminated film. Background technique [0002] Polarizing plates are widely used as polarized light supply elements and the like in display devices such as liquid crystal display devices. As the above-mentioned polarizing plate, a polarizing plate in which a polarizer layer made of a polyvinyl alcohol-based resin and a protective film such as triacetyl cellulose are laminated has been conventionally used. The polarizer layer (polarizing film) is required to be thinner and lighter in weight with the development of mobile devices such as notebook personal computers and mobile phones in recent years in addition to high optical performance of liquid crystal display devices. [0003] As an example of a method of manufacturing a thin polarizing plate, a method has been proposed in which a solution containing a polyvinyl alcohol-based resin is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B29C55/08G02F1/1335B29K29/00B29L7/00B29L9/00B29L11/00
CPCB29C55/08B29C55/20G02B5/3033
Inventor 九内雄一朗
Owner SUMITOMO CHEM CO LTD