Polarizing board and its manufacturing method
A polarizing plate and resin technology, applied in the field of polarizing plates, can solve the problems of unobtainable thickness and insufficient adhesion, and achieve the effect of excellent adhesion
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Problems solved by technology
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Examples
Embodiment 1
[0046] (a) Production of polarizing film
[0047] On a polyvinyl alcohol film with a thickness of 75 μm (the degree of polymerization is 2400, the degree of saponification is 99.9 mol% or more), uniaxially stretched at a stretching ratio of 5 times by a dry method, and directly stretched it on the Dyeing was carried out by immersing in pure water at 60° C. for 60 seconds, and then immersing in an aqueous solution whose weight ratio of iodine / potassium iodide / water was 0.05 / 5 / 100 for 60 seconds. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid ice of 6 / 7.5 / 100 at 73° C. for 300 seconds. Furthermore, after immersing in 15 degreeC pure water for 10 second and washing|cleaning, it dried at 50 degreeC, and obtained the iodine type polarizing film.
[0048] (b) Preparation of binder
[0049] As a urethane-based binder, add 100 parts of "EL-436A" (aqueous solution with a solid content concentration of 35%) manufactured by Toyo Mo...
Embodiment 2
[0057] As a urethane-based binder, 20 parts of "EA-W151A" (aqueous solution with a solid content concentration of 45%) manufactured by Toyo Motor Co., Ltd., which is an acrylic polyol as a main reagent, was mixed with 20 parts. "EA-W151B" manufactured by Toyo Motor-ton Co., Ltd. as an isocyanate-based curing agent (100% active ingredient), was further added with water to dilute the solid content to 40%. Except preparing the urethane binder according to the method, and making this change, the urethane binder and the polyvinyl alcohol aqueous solution are 1:1 by weight according to the same method as in Example 1 ( The weight ratio of the solid components was 20:3) to prepare a mixed binder, and using the binder, a polarizing plate was produced in the same manner as in Example 1.
[0058] On the surface of the first protective film made of cycloolefin-based resin of the obtained polarizing plate, a knife edge was cut at an angle of 45° relative to the normal direction of the fil...
Embodiment 3
[0060] Dissolve 3 parts of carboxyl-modified polyvinyl alcohol "Kurare Poba-ru KL318" manufactured by Kuraray Co., Ltd. in 100 parts of water, and further add 1.5 parts of "Sumire" manufactured by Sumitomo Chemical Co., Ltd. as a water-soluble polyamide epoxy resin. -Zuresin 650" (aqueous solution with a solid content of 30%) to make a binder. A polarizing plate was produced in the same manner as in Example 1, except that a polyvinyl alcohol-based adhesive was prepared in the same manner as in Example 1.
[0061] On the surface of the first protective film made of cycloolefin-based resin of the obtained polarizing plate, a knife edge was cut at an angle of 45° relative to the normal direction of the film and in the direction of the transmission axis. The protective film is peeled off, but cannot be peeled off. The same peeling test was also carried out on the surface of the second protective film made of triacetyl cellulose, but it still could not be peeled off.
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Abstract
Description
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