Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B33/00—Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
  • C09B33/02—Disazo dyes
  • C09B33/04—Disazo dyes in which the coupling component is a dihydroxy or polyhydroxy compound
  • C09B33/048—Disazo dyes in which the coupling component is a dihydroxy or polyhydroxy compound the coupling component being a bis-naphthol
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
  • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid

Definitions

• a polarizing element is generally produced by adsorbing and orienting a dichroic dye, iodine or a dichroic dye, onto a polyvinyl alcohol resin film.
• a protective film made of triacetyl cellulose or the like is bonded to at least one surface of the polarizing element via an adhesive layer to form a polarizing plate, which is used for a liquid crystal display device or the like.
• a polarizing plate using iodine as a dichroic dye is called an iodine polarizing plate, while a polarizing plate using a dichroic dye as a dichroic dye is called a dye polarizing plate.
• dye-based polarizing plates have problems of low transmittance compared to iodine-based polarizing plates having the same degree of polarization, that is, low contrast, but have high heat resistance, high humidity heat durability, and high stability.
• dyes having various colors have been developed, and the color selectivity by blending is high.
• the compound of the formula (1) thus obtained is generally used as a sodium salt, but can also be used as a lithium salt, potassium salt, ammonium salt, alkylamine salt or the like.
• the dye of formula (1) can be used in combination with other organic pigments to improve hue correction and polarization performance.
• the organic dye used in this case is a dye having absorption characteristics in a wavelength region different from that of the dye used in the present invention and having high polarization characteristics, and any dye may be used, and dichroism.
• the dye is not particularly limited as long as it dyes a hydrophilic polymer.
• Examples of the dye include dichroic dyes such as azo, anthraquinone, and quinophthalone, and examples of the dye described in the color index. Is done. For example, Sea. Ai. direct. Yellow 12, sea. Ai. direct. Yellow 28, Sea. Ai. direct. Yellow 44, Sea. Ai. direct. Orange 26, Sea. Ai. direct. Orange 39, sea.
• the dye of the formula (1) is impregnated in a film of polyvinyl alcohol resin or a derivative thereof.
• the manufacturing method of the polyvinyl alcohol resin which comprises a polarizing element is not specifically limited, For example, what is necessary is just to saponify a polyvinyl acetate resin.
• the polyvinyl acetate resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
• Examples of other monomers copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, and unsaturated sulfonic acids.
• the method for impregnating the dye may be carried out by immersing it in a solution containing a dichroic dye, but it may also be a method for containing the dye at the stage of molding the raw material of the polyvinyl alcohol-based resin film.
• An adhesive is required to bond the transparent protective layer to the polarizing element.
• a polyvinyl alcohol-type adhesive agent is preferable.
• the polyvinyl alcohol-based adhesive include, but are not limited to, Gohsenol NH-26 (manufactured by Nihon Gosei Co., Ltd.), EXEVAL RS-2117 (manufactured by Kuraray Co., Ltd.), and the like.
• a cross-linking agent and / or a waterproofing agent can be added to the adhesive.
• a maleic anhydride-isobutylene copolymer is used, but if necessary, an adhesive mixed with a crosslinking agent can be used.
• the dyes of the present application were significantly more light-resistant to light than Comparative Examples B-1 to B-3, and the reduction in contrast was suppressed more than twice.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Polarising Elements (AREA)
• Liquid Crystal (AREA)

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Publications (1)

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Cited By (1)

Citations (5)

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• 2013
  • 2013-02-19 CN CN201380009089.1A patent/CN104160305B/zh active Active
  • 2013-02-19 JP JP2014502139A patent/JP5989082B2/ja active Active
  • 2013-02-19 KR KR1020147020318A patent/KR101949190B1/ko not_active Expired - Fee Related
  • 2013-02-19 WO PCT/JP2013/053921 patent/WO2013129170A1/fr not_active Ceased
  • 2013-02-26 TW TW102106784A patent/TWI569047B/zh active

Patent Citations (5)

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