One-sided protective polarizing film with adhesive layer, image display device and continuous manufacturing method thereof

Abstract

In the single-sided protective polarizing film with an adhesive layer of the present invention, the polarizer contains polyvinyl alcohol resin, contains boric acid in an amount of 20% by weight or less relative to the total amount of the polarizer, has a thickness of 10 μm or less, and has Given the optical properties, the film thickness of the above-mentioned pressure-sensitive adhesive layer is less than 50 μm, when the storage modulus of the above-mentioned pressure-sensitive adhesive layer at 23° C. is G (Pa) and the film thickness is H (μm), 50 >H≥32, satisfy G>210e 0.2035H , when 32>H>0 satisfies G>35000e 0.0433H . In the above-mentioned one-sided protective polarizing film with an adhesive layer, the polarizer has predetermined optical characteristics, and can suppress through-cracks and defects caused by nano-slits.

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 above-mentioned one-sided protective polarizing film with an adhesive layer can be used alone or in the form of an optical film laminated with the above-mentioned polarizing film to form an image display device such as a liquid crystal display (LCD) or an organic EL display. 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 pola...

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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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