Production method of the polarized light element, the polarizing plate, the picture display and the polarized light element which are superior in durability and heat resistance

摘要

This invention, the zinc in the polarized light element, regards the production method of the polarized light element, the polarizing plate, the picture display and the polarized light element which are superior in durability and the heat resistance where boron and kalium content are controlled to the range of specification. According to the materialization of this invention, zinc content (weight %) x boron content (weight %)/kalium content (weight %) as for value 0.1 - 4.0, as for boron content 1.0 - 5.0 weight %, as for kalium content 0.3 - 2.0 weight % the polarized light element, include this the polarizing plate and the picture display which are offered with the weight of the polarized light element as a standard. In addition, as for the above-mentioned dyeing stage iodic density 0.05 - 0.2 weight %, iodide kalium density 0.2 - 1.5 weight % with, in the dyeing aqueous solution where temperature is 20 - the 40 - 300 seconds it soaks does 150 seconds poly- vinyl alcoholic films by the fact that in the production method of the polarized light element which at least includes dyeing stage, building a bridge stage, stretching stage and washing stage, as for the above-mentioned building a bridge stage boron density 0.36 - 0.83 weight %, density of the iodide kalium 4 - 7 weight % with, in the building a bridge aqueous solution where temperature is 15 - the 60 the poly- vinyl alcoholic film dipping 30 second - 120 secondsIt does by the fact that it does, at least a kind of is selected from the group which is formed with the above-mentioned zinc chloride, iodide zinc, the zinc sulfate, nitric acid zinc and zinc acetate zinc salt 0.4 - 7.0 weight % the above-mentioned dyeing aqueous solution, the building a bridge aqueous solution or the separate zinc salt processing aqueous solution inside is included by a kind of aqueous solution at least at density, above-mentioned washing stage production method of the polarized light element which is done by the fact that 10 - 30 seconds it soaks is offered the poly- vinyl alcoholic film to pure water of 25 - 30 temperature. The polarized light element, the polarizing plate and the picture layer display by one materialization of this invention are kept early crossing permeability and hue, permeability, degree of polarization and hue are kept show durability and the heat resistance which are superior even under hot condition. Selective figure Figure 1