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Laminate for polarizing plate, method for producing laminate for polarizing plate, and polarizing plate

A manufacturing method and laminated body technology, applied in the field of polarizing plates, can solve problems such as difficult to manufacture thin films

Active Publication Date: 2018-01-23
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned polyvinyl alcohol-based film is produced by dissolving a polyvinyl alcohol-based resin in a solvent such as water to prepare a stock solution, forming a film by a solution casting method (casting method), and drying it using a metal heating roll or the like; When producing polyvinyl alcohol-based films by solution casting, it is often difficult to produce films with a film thickness of 30 μm or less

Method used

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  • Laminate for polarizing plate, method for producing laminate for polarizing plate, and polarizing plate
  • Laminate for polarizing plate, method for producing laminate for polarizing plate, and polarizing plate
  • Laminate for polarizing plate, method for producing laminate for polarizing plate, and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] Use polyvinyl alcohol (A) having a 1,2-diol structure in the side chain (content of the 1,2-diol structure in the side chain: 1.0 mol%, average degree of saponification: 99.8 mol%, viscosity of 4% aqueous solution (20 °C): 85mPa·s), prepare a polyvinyl alcohol aqueous solution with a concentration of 14%.

[0136] On an amorphous polyethylene terephthalate (PET) film (thickness: 100 μm) as the base film [I], apply the 14% polyvinyl alcohol aqueous solution so that the thickness after drying becomes 10 μm, By drying at a drying temperature of 60° C., a laminate [III] of a PET film / polyvinyl alcohol layer was obtained.

[0137] With regard to the obtained laminate [III], the film thickness uniformity of the resin layer was evaluated as follows.

[0138] (Film thickness uniformity of polyvinyl alcohol resin layer)

[0139] The substrate film [I] was peeled off from the laminate [III] obtained above, and the resin layer [II] was measured using a film thickness gauge (“DIG...

Embodiment 2～3、 comparative example 1

[0149] Except the conditions of Table 1, it installed similarly to Example 1, and obtained the laminated body [III] and the laminated body for polarizing plates. Evaluation similar to Example 1 was performed about the obtained laminated body for polarizing plates.

[0150] The evaluation results of Examples and Comparative Examples are shown in Table 1 below.

[0151] [Table 1]

[0152]

[0153] From the above results, in the case of using the conventional unmodified polyvinyl alcohol-based resin like Comparative Example 1, although the optical characteristics were good, the film thickness uniformity of the resin layer containing the polyvinyl alcohol-based resin was poor; In the case of using polyvinyl alcohol-based resins with a specific structure like Examples 1 to 3, the viscosity stability of the polyvinyl alcohol-based resin is very excellent, so the film thickness uniformity of the resin layer containing the polyvinyl alcohol-based resin is excellent, Furthermore, ...

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Abstract

In the present invention, in order to obtain a laminate for a polarizing plate, where the laminate is used for manufacturing a thin film polarizing plate having excellent polarizer film thickness and no irregularities in dyeing, provided is a laminate for a polarizing plate that is characterized by the following: being formed by stretching a laminate (III) of a base material film (I) and a resin layer (II) that contains a polyvinyl alcohol resin (A) having a 1,2-diol structure in a side chain; and being formed by dyeing the resin layer (II) that contains a polyvinyl alcohol resin (A) having a 1,2-diol structure in a side chain.

Description

technical field [0001] The present invention relates to a laminate for a polarizing plate that is effective for producing a polarizing plate, and more specifically, to a laminate for a polarizing plate used for producing a polarizing plate of a film, a method for manufacturing the laminate for a polarizing plate, and a polarizing plate using the laminate. A polarizing plate made of a laminate for use in the plate; the film thickness uniformity of the polarizing plate of the polarizing plate is excellent, and there is no unevenness in dyeing. Background technique [0002] Conventionally, a polarizing plate has been used in a liquid crystal display device. In order to form a bright image with good color reproducibility, the polarizing plate needs to have both high light transmittance and high polarization degree. As such a polarizing plate, a polarizing plate in which a transparent protective film is bonded to one or both sides of a polarizing plate with an adhesive, and a tri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B27/30G02F1/1335
CPCG02B5/305
Inventor 豊田大贵平井香
Owner MITSUBISHI CHEM CORP