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Photocurable adhesive composition, polarizing plate and a process for producing the same, optical member and liquid crystal display device

A photocurable and adhesive technology, used in optical components, polarizing components, nonlinear optics, etc., can solve the problems of inability to conceal foreign objects, weak physical strength of polarizers, and high viscosity, and achieve easy curing and excellent reliability. Effect

Active Publication Date: 2010-09-29
SUMITOMO CHEM CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the viscosity of the adhesive suitable for dry lamination is extremely high, there is a problem that the physical strength of the polarizer is weak. The method of attaching it to the polarizer after applying the adhesive
In this method, if a foreign matter adheres to the surface of the adhesive before bonding, the foreign matter cannot be concealed, and bubbles are generated between the adhesive layer and the polarizing plate starting from the foreign matter after bonding, so it becomes a bright spot defect. s reason

Method used

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  • Photocurable adhesive composition, polarizing plate and a process for producing the same, optical member and liquid crystal display device
  • Photocurable adhesive composition, polarizing plate and a process for producing the same, optical member and liquid crystal display device

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preparation example Construction

[0260] [Preparation of Adhesive Composition]

[0261] Each component shown in Table 1 and Table 2 was mixed in each ratio, and it stirred and mixed by the usual method, and the photocurable adhesive composition was prepared. In addition, "UVI-6992" used as component (C) is a propylene carbonate solution containing 50% active ingredient, therefore, component (C) is shown separately from propylene carbonate in the table. In other words, the blending amount of "UVI-6992" in the table indicates the ratio of solid components, and the blending amount of "UVI-6992" itself is the amount shown in the column of (C) component and the amount shown in the column of propylene carbonate. The sum of the quantities is 6%.

[0262] [Manufacture of polarizing plate (1)]

[0263] Here, the following two types of films were used as the protective film.

[0264] Stretched norbornene-based resin film: thickness 70 μm, trade name “ZEONOR film”, manufactured by Nippon Zeo Co., Ltd. Corona discharg...

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Abstract

The invention provides a photocurable adhesive composition and a polarizing plate which attaches a protecting membrance to a polarizing sheet by means of the adhesive. The photocurable adhesive composition is able to be adhered on the polarizing sheet in a short period with a complete adhesive strength even though a resin membrance selected from polyester resin, polycarbonate resin and acrylic acid resin with low humidity transmissivity is taken as the protecting membrance. When the polarizing sheet made of polyethylene alcoholic resin membrance which is unidirectionally stretched and attracted with orientioned dichromatic pigments is adhered to the protecting membrance made of the resin membrance with low humidity transmissivity, the photocurable adhesive composition includes (A) an epoxy compound having at least two epoxy groups in the molecule, (B) an oxetane compound including at least an oxetanyl group in the molecule and (C) an optical cation polymerization initiator, wherein A / C (wt.%) is 90 / 10 to 10 / 90 and the C is 0.5-20 wt.% in the composition.

Description

technical field [0001] The present invention relates to a photocurable adhesive composition for bonding a polarizing plate and a protective film to a polarizing plate, a polarizing plate having a protective film bonded to a polarizing plate using the adhesive composition, and the polarizing plate Production method. The present invention also relates to an optical component and a liquid crystal display device using the polarizing plate. Background technique [0002] A polarizing plate can be used as an optical component constituting a liquid crystal display device. A polarizing plate is generally used in a liquid crystal display device with a structure in which a protective film is laminated on both surfaces of the polarizing plate. It is known that a protective film is provided on only one side of a polarizer, but in many cases, not a simple protective film but a layer having other optical functions is also bonded to the other side as a protective film. Moreover, as the m...

Claims

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Application Information

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IPC IPC(8): C09J163/00C09J163/02C09J163/04C09J171/02B32B27/08B32B37/12G02B5/30G02F1/1335
CPCC09J163/00C09J2203/318C09J7/22C09J7/29C09J2301/302G02B5/3025G02B5/305G02F1/133509G02F1/133514G02F1/133528G02F1/13356
Inventor 岩田智竹内智康藤田政大稻田和正佐内康之
Owner SUMITOMO CHEM CO LTD
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