Polarizer and method for manufacturing same

Abstract

The purpose of the present invention is to provide a polarizer having excellent quality even when being cut. This polarizer comprises a dyed portion, a cut portion, and a decolorized portion between the dyed portion and the cut portion. Further, this method for manufacturing a polarizer comprises: imparting a polarization function to a resin film; decolorizing the resin film to which the polarization function is imparted; and cutting a section of the decolorized portion.

Description

technical field

[0001] The present invention relates to a polarizer and a manufacturing method thereof. More specifically, it relates to a polarizer having excellent quality even when a cutting process is performed, and a method for producing the same. Background technique

[0002] Polarizing plates are used in various image display devices such as mobile phones and notebook personal computers (PCs). In recent years, the demand for polarizing plates has been increasing in various applications such as smartphones and in-vehicle displays. Among these uses, the polarizing plate can be subjected to deformed processing corresponding to the portion to be mounted, and processing to provide openings. For example, Patent Document 1 proposes a polarizing plate in which an opening is provided in a portion corresponding to a camera. However, when these processes are carried out, there are problems that cracks are generated in the polarizer during processing, and the quality of the po...

Examples

Embodiment 1

[0093] As the base material, an amorphous isophthalic acid copolymer polyethylene terephthalate (IPA copolymer PET) film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75° C. was used. Corona treatment was performed on one side of the substrate, and the corona treated side was coated with polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl modified in a ratio of 9:1 at 25°C. An aqueous solution of PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") was dried to form a PVA-based resin with a thickness of 11 μm layer to produce a laminate.

[0094] The obtained laminate was uniaxially stretched at the free end to 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different circumferential speeds in an oven at 120° C. (air-assis...

Embodiment 2

[0104] Except having cut|disconnected so that the width of the discolored part which remained after cutting might become 0.5 mm, it carried out similarly to Example 1, and obtained the polarizer which has the discolored part of width 0.5 mm.

Embodiment 3

[0106] A polarizer having a discolored portion with a width of 1 mm was obtained in the same manner as in Example 1, except that a transparent portion (2.8 mm in diameter) was formed at a portion 1 mm from the long side of the cut out test piece.

technical field

[0001] The present invention relates to a polarizer and a manufacturing method thereof. More specifically, it relates to a polarizer having excellent quality even when a cutting process is performed, and a method for producing the same. Background technique

[0002] Polarizing plates are used in various image display devices such as mobile phones and notebook personal computers (PCs). In recent years, the demand for polarizing plates has been increasing in various applications such as smartphones and in-vehicle displays. Among these uses, the polarizing plate can be subjected to deformed processing corresponding to the portion to be mounted, and processing to provide openings. For example, Patent Document 1 proposes a polarizing plate in which an opening is provided in a portion corresponding to a camera. However, when these processes are carried out, there are problems that cracks are generated in the polarizer during processing, and the quality of the po...

Examples

Embodiment 1

[0093] As the base material, an amorphous isophthalic acid copolymer polyethylene terephthalate (IPA copolymer PET) film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75° C. was used. Corona treatment was performed on one side of the substrate, and the corona treated side was coated with polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl modified in a ratio of 9:1 at 25°C. An aqueous solution of PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") was dried to form a PVA-based resin with a thickness of 11 μm layer to produce a laminate.

[0094] The obtained laminate was uniaxially stretched at the free end to 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different circumferential speeds in an oven at 120° C. (air-assis...

Embodiment 2

[0104] Except having cut|disconnected so that the width of the discolored part which remained after cutting might become 0.5 mm, it carried out similarly to Example 1, and obtained the polarizer which has the discolored part of width 0.5 mm.

Embodiment 3

[0106] A polarizer having a discolored portion with a width of 1 mm was obtained in the same manner as in Example 1, except that a transparent portion (2.8 mm in diameter) was formed at a portion 1 mm from the long side of the cut out test piece.

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