JPS5930887Y2 - Polarizer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a polarizing plate having an adhesive layer on one side.

Conventionally, as a polarizing plate having an adhesive layer on one side, protective layers are formed on both sides of an iodine and/or dichroic dye polarizer or a polyene polarizer, and an adhesive layer is formed on one surface of the layer. It is known that an adhesive layer and a release film are sequentially formed on the other surface, with a surface protection film temporarily attached.

In the surface protection film mentioned above, a polarizing plate is attached to a liquid crystal cell with an adhesive layer to form a display plate, and when this is incorporated into a liquid crystal display device, the protective layer is protected, and finally the adhesive layer Both are peeled off.

However, the surface protection films used so far are
Films with poor impact resistance, heat resistance, and dimensional stability, such as polyethylene film and polyvinyl chloride film, are used as the support, and the protective layer is temporarily attached using an adhesive layer. ) When attaching the polarizing plate to the liquid crystal cell,
If pressure or heating is applied from the surface of the surface protection film of the polarizing plate, the protective layer may be damaged or the polarizer may be deformed.

(2) The adhesive layer cannot suppress deformation or shrinkage of the polarizer and the protective layer due to oral and thermal factors because it has fluid deformability.

(3) Due to the oral deterioration of the adhesive layer and the pressure or heat applied during the attachment of the liquid crystal cell, the adhesive force may increase to the extent that the polarizer is deformed when the film is peeled off, or the adhesive may be damaged on the protective layer surface. It may remain and contaminate the protective layer.

It has the following drawbacks.

The present invention provides a novel polarizing plate that solves the drawbacks of the prior art, and its gist is that a protective layer is formed on both sides of the polarizer, and one surface of the layer is provided with a shock-resistant layer. A self-supporting plastic film that has good flexibility, surface smoothness, heat resistance, and dimensional stability is removably adhered to the other surface without using an adhesive layer, and the plastic film can be peeled off via the adhesive layer on the other surface. It is attached to.

An example of the present invention will be explained in detail below using the drawings.

In Figure 1, 1 is a polarizer made by adsorbing and aligning iodine and/or dichroic dye to a hydrophilic polymer film such as polyvinyl alcohol, or a polyester film made by dehydrochlorinating a polyvinyl chloride film. A polarizer such as a system polarizer (about 10 to 100μ thick), 2.2' is a protective layer (about 10 to 300μ thick) provided on both sides of the polarizer, and the layer 2.2' is a dielectric polarizer. It is formed by laminating acetate-based films such as acetate or triacetate, or by coating and hardening a coating resin layer by a polymerization reaction such as polyurethane-based resin or acrylic polymer resin.

On the surface of the layer 2 is a self-supporting plastic film 3 having impact resistance, surface smoothness, heat resistance and dimensional stability.
is removably attached without using an adhesive layer.

The film 3 may be a polyester film, a polyfluoroethylene film, a polypropylene film, etc. having a thickness of about 20 microns or more, preferably 50 microns to 300 microns, and a polyester film is preferred from the viewpoint of availability and surface smoothness.

If necessary, a peelable resin layer such as silicone polymer may be provided on the film 3 in contact with the protective layer 2 by baking.

In order to releasably adhere the film 3 and the protective layers 2, 2' without using an adhesive layer, for example, the film 3 and the protective layers 2, 2'
heating and pressurizing the film 3 and/or the protective layer 2, melting or swelling the surface of the material forming the film 3 and/or the protective layer 2, or applying a polymer component that is the same as or similar to the material forming the film 3 and/or the protective layer 2. A method such as coating one side of each with a solution containing the adhesive and bonding them together can be adopted.

In addition, an adhesive layer 4 for adhering the polarizing plate to a liquid crystal cell (not shown) is provided on the surface of the other protective layer 2', and the surface of this layer 40 is provided with peelability. A plastic film 5 such as a plastic film or plastic-processed paper is releasably attached.

FIG. 2 shows another example, in which a protective film 62 is attached to the surface of the film 3 via an adhesive layer 61, and the film 62 disperses the pressure applied from above, and the polarizer 1 to more reliably prevent deformation.

Since the polarizing plate with an adhesive layer of the present invention is constructed as described above, the polarizer will not be deformed by the pressure applied when pasting it to a liquid crystal cell or by heating and pressure, and the polarizer will not be deformed during storage etc. Also, deformation or shrinkage of the protective layer is suppressed because the plastic film is in a strong adhesive state in the shear direction, so that deformation or shrinkage is less likely to occur.

Moreover, since the plastic film is removably attached to the protective layer surface without using an adhesive layer, the adhesive strength does not increase due to pressure or heating when attaching it to oral or liquid crystal cells, and it protects the casing. It has the special effect of not contaminating the layer surface.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the present invention, and FIG. 2 is a side view showing another example. 1...Polarizer, 2,2'...Protective layer,
3...Self-supporting plastic film, 4
...adhesive layer.

Claims (2)

[Scope of utility model registration request] (1) A protective layer is formed on both sides of the polarizer, and a self-supporting plastic film with impact resistance, surface smoothness, heat resistance, and dimensional stability is formed on one surface of the polarizer without using an adhesive layer. A polarizing plate that is releasably attached to the surface of the polarizing plate, and a plastic film is releasably attached to the other surface of the plate via an adhesive layer. (2) Utility Model Registration The polarizing plate according to claim 1, in which an adhesive protective film is adhered to the surface of the plastic film.