One-side-protected polarizing film with adhesive layer, image display device, and continuous production method for same

Abstract

The one-side-protected polarizing film with an adhesive layer has a polarizer that contains a polyvinyl alcohol resin, contains 20 wt% or less of boric acid relative to the total quantity of the polarizer, has a thickness of 10 [mu]m or less, and has prescribed optical characteristics. The film thickness of the adhesive layer is less than 50 [mu]m, and if the storage modulus of the adhesive layerat 23 degees centigrade is termed G (Pa) and the film thickness is termed H ([mu]m), when 50 > H >= 32, G > 210e0.2035H is satisfied, and when 32 > H > 0, G > 35000e0.0433H is satisfied. In the one-side-protected polarizing film with an adhesive layer, the polarizer has prescribed optical characteristics, and defects resulting from through-cracks and nanoslits can be suppressed.

Description

technical field [0001] The present invention relates to a single-side protective polarizing film with an adhesive layer having a single-side protective polarizing film provided with a protective film only on one surface of a polarizer, and an adhesive layer. The one-side protective polarizing film with an adhesive layer can form an image display device such as a liquid crystal display (LCD) or an organic EL display device alone or in the form of an optical film laminated with the above polarizing film. Background technique [0002] For liquid crystal display devices, it is essential to arrange polarizing films on both sides of the glass substrate forming the surface of the liquid crystal panel in view of its image forming method. As for the polarizing film, one or both sides of a polarizer made of a polyvinyl alcohol film and a dichroic material such as iodine are generally used. Polarizing film. [0003] When bonding the above-mentioned polarizing film to a liquid crystal...

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Problems solved by technology

[0004] In addition, the polarizing film and the one-side protective polarizing film with an adhesive layer are in a harsh environment of thermal shock (for example, a thermal shock test repeated at a temperature of -30°C and 80°C, a test at a high temperature of 100°C), there is The problem that cracks (penetrating cracks) are likely to occur in the direction of the entire absorption axis of the polarizer due to changes in the shrinkage stress of the polarizer

That is, the one-sided protective polarizing film with an adhesive layer has insufficient durability against thermal shock in the above-mentioned harsh environment.

In particular, for a single-sided protective polarizing film with an adhesive layer using a single-sided protective polarizing film provided with a protective film only on one side of a polarizer from the viewpoint of thinning, the above-mentioned relative thermal shock lack of durability

In addition, penetrating cracks caused by the above-mentioned thermal shock are more likely to occur when the size of the polarizing film becomes larger.

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