CN104160305B - Dyestuff system polarization element and polaroid - Google Patents

Dyestuff system polarization element and polaroid Download PDF

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Publication number
CN104160305B
CN104160305B CN201380009089.1A CN201380009089A CN104160305B CN 104160305 B CN104160305 B CN 104160305B CN 201380009089 A CN201380009089 A CN 201380009089A CN 104160305 B CN104160305 B CN 104160305B
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polarization element
polaroid
film
formula
dyestuff
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CN104160305A (en
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望月典明
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Nippon Kayaku Co Ltd
Polatechno Co Ltd
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Nippon Kayaku Co Ltd
Polatechno Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B33/00Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
    • C09B33/02Disazo dyes
    • C09B33/04Disazo dyes in which the coupling component is a dihydroxy or polyhydroxy compound
    • C09B33/048Disazo dyes in which the coupling component is a dihydroxy or polyhydroxy compound the coupling component being a bis-naphthol
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • G02B5/3025Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033Polarisers, 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

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

Abstract

Problem of the present invention is to develop a kind ofly to be had good polarized light property and also has the polarization element of high-durability.The present invention relates to a kind of polarization element, it is characterized in that, it is by containing polyvinyl alcohol resin or derivatives thereof and dichroic dye and the polarization element that forms of the film stretched, the azo-compound represented by formula (1) that at least one of this dichroic dye is free acid form or its salt.(in formula, A represents the phenyl with at least 1 carboxyl alternatively base.)

Description

Dyestuff system polarization element and polaroid
Technical field
The present invention relates to dyestuff system polarization element and the polaroid employing this polarization element.
Background technology
Polarization element is normally by making to be adsorbed on polyvinyl alcohol resin film as the iodine of dichromatism pigment or dichroic dye and carrying out orientation to manufacture.By adhesive layer, the diaphragm formed by triacetyl cellulose etc. is fitted at least one side of this polarization element to make polaroid, thus in liquid crystal indicator etc.Use iodine to be called as iodine system polaroid as the polaroid of dichromatism pigment, in addition, use dichroic dye to be called as dyestuff system polaroid as the polaroid of dichromatism pigment.Among them, if compare with the iodine system polaroid with identical degree of polarization, then dyestuff system polaroid has low, that namely contrast the is low problem of transmitance, but it has following characteristics: have high-fire resistance, high wet heat durability, high stability, and, have developed the dyestuff with various color, high color selective can be obtained by carrying out cooperation.
In addition, in recent years, on optical applications, the intensity of light source improves increasingly, has because this high light and the thermal conductance that produces together with it cause the problem of polaroid generation variable color.In addition, particularly for the polaroid for liquid crystal displays such as digital signage, these digital signage are contemplated in outdoor application, also require degree of polarization and its photostability, and its improvement requires high.
Prior art document
Patent documentation
Patent documentation 1: No. 3769140th, Japanese patent gazette
Patent documentation 2: Japanese Unexamined Patent Publication 2003-313451
Patent documentation 3: Japanese Patent Publication 64-5623
Patent documentation 4: No. 2004-075719, Japanese Unexamined Patent Publication
Non-patent literature
Non-patent literature 1: Machine (functional pigmented application) the 1st printing of property pigment ying can issue version, and Co., Ltd. C MC publishes, and enters Jiang Zhenghao chief editor, P98-100
Non-patent literature 2: dyestuff chemistry; Thin Tian Fengzhu; Skill report hall
Summary of the invention
The problem that invention will solve
Patent documentation 1 and Patent Document 2 discloses the patent relating to the sunproof polaroid of requirement and the dyestuff for polaroid.In the embodiment 5 of patent documentation 3, disclose two J acid aminoazo-compound diazotising obtained.
But, although disclose the such technology of patent documentation 1, patent documentation 2, do not meet the requirement in market, and although the permanance of dyestuff dyestuff disclosed in patent documentation 3 is higher, polarized light property is low.Thus, people require to develop to have good polarized light property and the polarization element also with high-durability.
The present inventor conducts in-depth research to solve above-mentioned problem, a kind of polarization element of result new discovery, this polarization element has good polarized light property and also has high-durability, this polarization element by containing polyvinyl alcohol resin or derivatives thereof and dichroic dye and the film stretched form, it is characterized in that, azo-compound represented by formula (1) of at least one of this dichroic dye or its salt.
For solving the scheme of problem
That is, the present invention relates to following content.
(1) a kind of polarization element, it is by containing polyvinyl alcohol resin or derivatives thereof and dichroic dye and the polarization element that forms of the film stretched, the azo-compound represented by formula (1) that at least one of this dichroic dye is free acid form or its salt;
(in formula, A represents the phenyl with at least 1 carboxyl alternatively base.)
(2) polaroid, the one side of its polarization element described in (1) or be two-sidedly provided with protective seam;
(3) liquid crystal indicator, it the has polarization element described in (1) or the polaroid described in (2);
(4) spreadlight lens, it the has polarization element described in (1) or the polaroid described in (2).
The effect of invention
Polarization element containing polyvinyl alcohol resin or derivatives thereof and dichroic dye of the present invention or polaroid have high-durability and good polarized light property.
Embodiment
Below, the present invention is described in detail.
The present invention relates to a kind of polarization element, it is by containing polyvinyl alcohol resin or derivatives thereof and dichroic dye and the polarization element that forms of the film stretched, it is characterized in that, the azo-compound represented by formula (1) that at least one of this dichroic dye is free acid form or its salt, the feature of this polarization element is, it has good polarized light property and also has high-durability.By making polyvinyl alcohol mesentery contain at least one of the dyestuff represented by formula (1) and stretch, forming film, above-mentioned feature can be realized thus.
(in formula, A represents the phenyl with at least 1 carboxyl alternatively base.)
Next, the concrete example of the azo-compound represented by above-mentioned formula (1) used in the present invention is enumerated below.It should be noted that, the sulfo group in formula, carboxyl and hydroxyl represent with the form of free acid.
Synthetic method
Azo-compound represented by formula (1) or its salt according to the method for making of the common azo dyes recorded in non-patent literature 2, easily can manufacture by carrying out coupling.As concrete manufacture method, such as, the amino-compound that formula (20) represents is utilized known method diazotising, N is coupled at 10 DEG C ~ 20 DEG C alkali, two (1-hydroxyl-3-sulfo group-6-naphthyl) amine of N-(trivial name: two J acid) and obtain two azo-compounds, obtains the solution of the compound containing formula (1).
(in formula, Rx or Ry represent respectively hydrogen atom, carbon number be 1 to 4 low alkyl group, carbon number be 1 to 4 lower alkoxy, hydroxyl, carboxyl, nitro or halogen atom.)
Next by this solution evaporate to dryness or filtration drying of saltouing, pulverize, obtain the compound of the formula (1) of the application of powdered.The compound of the formula (1) so obtained uses with the form of sodium salt usually, also can use with the form of lithium salts, sylvite, ammonium salt, alkylamine salt etc.
The dyestuff of formula (1) carries out the correction of tone and the raising of polarizing properties by share with other organic pigment.As the organic pigment in this case used, as long as there is the pigment of absorption characteristic and polarized light property Gao Zeke thinks any dyestuff in the wavelength region may that the absorbing wavelength region from the pigment used in the present invention is different, dichroic dye is not particularly limited, as long as hydrophilic macromolecule can be dyeed, the dichroic dyes such as azo system, anthraquinone system, quinophthalone system can be enumerated, the pigment recorded with color index can be exemplified in addition.Such as C.I. directly yellow 12, C.I. directly yellow 28, C.I. Direct Yellow 44, C.I. direct orange 26, C.I. direct orange 39, C.I. direct orange 107, C.I. directly red 2, C.I. directly red 31, C.I. directly red 79, C.I. directly red 81, C.I. directly red 247, C.I. direct green 80, C.I. direct green 59 can be enumerated; And Japanese Unexamined Patent Publication 2001-33627, Japanese Unexamined Patent Publication 2002-296417, Japanese Unexamined Patent Publication 2003-215338, WO2004/092282, Japanese Unexamined Patent Publication 2001-056412, Japanese Unexamined Patent Publication 2001-027708, Japanese Unexamined Patent Publication 11-218611, Japanese Unexamined Patent Publication 11-218610, Japanese Laid-Open Patent Publication 60-156759, organic dyestuff etc. described in non-patent literature 1.These organic dyestuff, except using with the form of free acid, can also use with the form of the salt of alkali metal salt (such as Na salt, K salt, Li salt), ammonium salt or amine.Wherein, dichroic dye is not limited thereto, and also can use known dichroic dye, but preferred azo based dye.Except these shown dichroic dyes, also can share other organic dyestuff as required.
For object polarization element, be the difference of muted color polarization element, the colored polarization element of liquid crystal projection apparatus or other colored polarization element according to it, the kind of the organic dyestuff coordinated separately is also different.Its blending ratio is not particularly limited, combined amount can be set arbitrarily according to the expectation of light source, permanance, required tone etc.
The dyestuff of formula (1) is infiltrated up in the film of polyvinyl alcohol resin or derivatives thereof.The manufacture method of the polyvinyl alcohol resin forming polarization element is not particularly limited, such as, can by vinylite saponification.As vinylite, except as except the polyvinyl acetate of leifa, can also enumerate vinyl acetate and can with the multipolymer etc. of other monomer of its copolymerization.As other monomer with vinyl acetate copolymerization, such as unsaturated carboxylic acid class, olefines, vinyl ethers or unsaturated sulfonic acid class etc. can be enumerated.The saponification degree of polyvinyl alcohol resin is usually preferably 85 % by mole ~ 100 % by mole, is more preferably more than 95 % by mole.This polyvinyl alcohol resin can be modified further, such as, also can use polyvinyl formal or Pioloform, polyvinyl acetal etc. through aldehydes modification.In addition, the degree of polymerization of polyvinyl alcohol resin is usually preferably 1,000 ~ 10,000, is more preferably 1,500 ~ 6,000.The derivant of the polyvinyl alcohol resin that can use in the present invention can enumerate the resin etc. implementing above-mentioned modification.
Film polyvinyl alcohol resin or derivatives thereof (hereinafter both being called polyvinyl alcohol resin in the lump) film forming obtained uses as base film (former anti-Off ィ Le system).The film build method of polyvinyl alcohol resin is not particularly limited, known method can be utilized to carry out film forming.In this case, polyvinyl alcohol resin film can contain glycerine, ethylene glycol, propylene glycol or low molecular poly etc. as plastifier.Plasticising dosage is preferably 5 % by weight ~ 20 % by weight, is more preferably 8 % by weight ~ 15 % by weight.The thickness of the base film formed by polyvinyl alcohol resin is not particularly limited, such as, is preferably 5 μm ~ 150 μm, is more preferably 10 μm ~ 100 μm.
First swelling operation is implemented to above-mentioned polyvinyl alcohol resin film.Swelling operation is carried out by being flooded in the solution of 20 DEG C ~ 50 DEG C by polyvinyl alcohol resin film for 30 seconds ~ 10 minutes.Solution is preferably water.When the time manufacturing polarization element will be shortened, due to also can be swelling when the dyeing process of dyestuff, thus also swelling operation can be omitted.
Dyeing process is implemented after swelling operation.Dyeing process is by making polyvinyl alcohol resin film immersion in containing the solution of dichroic dye and making dyestuff infiltrate.Solution temperature in this operation is preferably 5 DEG C ~ 60 DEG C, is more preferably 20 DEG C ~ 50 DEG C, is particularly preferably 35 DEG C ~ 50 DEG C.The dipping time in the solution can appropriateness regulate, and preferably regulates at 30 seconds ~ 20 minutes, is more preferably 1 minute ~ 10 minutes.For colouring method, be preferably immersed in this solution, but also by this solution is applied to polyvinyl alcohol resin film to carry out.
Solution containing dichroic dye can contain sodium chloride, sodium sulphate, anhydrous sodium sulfate, sodium tripolyphosphate etc. as dyeing assistant.Their content can according to depending on time of dyeing, temperature is adjusted to arbitrary concentration, be preferably 0 % by weight ~ 5 % by weight with respective content meter, be more preferably 0.1 % by weight ~ 2 % by weight.
The method of infiltrating as making dyestuff, is undertaken by being immersed in the solution containing dichroic dye, also it can be made to contain the method for dyestuff for the stage of carrying out processing and forming at the base film (former anti-) to polyvinyl alcohol resin film.
After dyeing process, matting (hereinafter referred to matting 1) can be carried out before entering ensuing operation.Matting 1 is carry out the operation of cleaning for the dye solvent being attached to polyvinyl alcohol resin film surface in dyeing process.By carrying out matting 1, dyestuff can be suppressed to transfer in the liquid next carrying out processing.Usually water is used in matting 1.
Cleaning method is preferably immersed in this solution, also can by this solution is applied to polyvinyl alcohol resin film to clean.The time of cleaning is not particularly limited, is preferably 1 second ~ 300 seconds, is more preferably 1 second ~ 60 seconds.The temperature of the solvent in matting 1 needs for the temperature of dissolving does not occur hydrophilic macromolecule.Usually cleaning treatment is carried out at 5 DEG C ~ 40 DEG C.
After dyeing process or matting 1, the operation made it containing crosslinking chemical and/or resistance to hydrated agent can be carried out.As crosslinking chemical, such as, can use the boron compounds such as boric acid, borax or ammonium borate; The polyaldehyde such as glyoxal or glutaraldehyde; The multicomponent isocyanate based compounds such as biuret form, isocyanuric acid ester type or end-sealed type; The titanium sub-group compounds etc. such as titanyl sulfate, can use diglycidyl ether of ethylene glycol, polyamideepichlorohydrin etc. in addition.As resistance to hydrated agent, succinic acid peroxide, ammonium persulfate, Calcium perchlorate, benzoin ethyl ether, ethylene glycol diglycidylether, glycerin diglycidyl ether, ammonium chloride or magnesium chloride etc. can be enumerated, preferably use boric acid.The crosslinking chemical of more than the above at least one illustrated and/or resistance to hydrated agent is used to carry out the operation made it containing crosslinking chemical and/or resistance to hydrated agent.Be preferably water as solvent now, but be not limited to water.Make it in the operation containing crosslinking chemical and/or resistance to hydrated agent, for the crosslinking chemical in solvent and/or resistance to hydrated agent containing concentration, for boric acid, be preferably 0.1 % by weight ~ 6.0 % by weight relative to the concentration of solvent, be more preferably 1.0 % by weight ~ 4.0 % by weight.Solvent temperature in this operation is preferably 5 DEG C ~ 70 DEG C, is more preferably 5 DEG C ~ 50 DEG C.For the method made containing crosslinking chemical and/or resistance to hydrated agent in polyvinyl alcohol resin film, be preferably immersed in this solution, also by the coating of this solution or polyvinyl alcohol resin film can be applied to.Processing time in this operation is preferably 30 seconds ~ 6 minutes, is more preferably 1 minute ~ 5 minutes.Wherein, make it containing crosslinking chemical and/or resistance to hydrated agent non-essential, when wanting the shortening time, when crosslinking Treatment or resistance to hydration process need not be carried out, also can omit this treatment process.
After having carried out dyeing process, matting 1 or having made it the operation containing crosslinking chemical and/or resistance to hydrated agent, carry out stretching process.Stretching process refers to the operation of polyvinyl alcohol mesentery being carried out to unilateral stretching.Drawing process can be any one of wet type pulling method or dry stretch process.
When dry stretch process, when stretching heating medium is normal temperature ~ 180 DEG C, air dielectric, be preferably stretch under the condition of normal temperature ~ 180 DEG C in the temperature of air dielectric.In addition, for humidity, preferably process in the atmosphere of 20%RH ~ 95%RH.As heating means, can enumerate such as between roller region stretch (ロ ー Le Inter ゾ ー Application extend (rollzone-drawing)) method, roller adds hot-drawing method, pressurization stretches (calendering is stretched) method, infrared heating pulling method etc., but is not limited to this drawing process.Stretching process can be 1 section of stretching, also can be stretched by the multistage of more than 2 sections and carry out.
When wet type pulling method, stretch in water, water-miscible organic solvent or its mixed solution.Stretch processing is carried out while being preferably immersed in the solution containing crosslinking chemical and/or resistance to hydrated agent.As crosslinking chemical, the boron compounds such as such as boric acid, borax or ammonium borate can be used; The polyaldehyde such as glyoxal or glutaraldehyde; The multicomponent isocyanate based compounds such as biuret form, isocyanuric acid ester type or end-sealed type; The titanium sub-group compounds etc. such as titanyl sulfate, can use diglycidyl ether of ethylene glycol, polyamideepichlorohydrin etc. in addition.As resistance to hydrated agent, succinic acid peroxide, ammonium persulfate, Calcium perchlorate, benzoin ethyl ether, ethylene glycol diglycidylether, glycerin diglycidyl ether, ammonium chloride or magnesium chloride etc. can be enumerated.Can stretch in the solution containing the crosslinking chemical more than at least one illustrated above and/or resistance to hydrated agent.Crosslinking chemical preferred boric acid.The concentration of the crosslinking chemical in stretching process and/or resistance to hydrated agent is such as preferably 0.5 % by weight ~ 15 % by weight, is more preferably 2.0 % by weight ~ 8.0 % by weight.Stretching ratio is preferably 2 ~ 8 times, is more preferably 5 ~ 7 times.For draft temperature, preferably carry out processing, being more preferably 45 DEG C ~ 58 DEG C at 40 DEG C ~ 60 DEG C.Stretching time is generally 30 seconds ~ 20 minutes, is more preferably 2 minutes ~ 5 minutes.Wet type stretching process can carry out 1 section of stretching, is also undertaken by the multistage stretching of more than 2 sections.
After carrying out stretching process, sometimes have the precipitation of crosslinking chemical and/or resistance to hydrated agent on film surface or have the attachment of foreign matter, thus can carry out the matting (hereinafter referred to matting 2) that film surface is cleaned.Scavenging period is preferably 1 second ~ 5 minutes.Cleaning method is preferably immersed in cleaning solution, also by being applied by solution or being applied to polyvinyl alcohol resin film to clean.1 section of cleaning treatment can be carried out, also can carry out the multistage process of more than 2 sections.The solution temperature of matting is not particularly limited, is generally 5 DEG C ~ 50 DEG C, is preferably 10 DEG C ~ 40 DEG C.
As solvent used in treatment process hereto, such as water can be enumerated; Dimethyl sulfoxide (DMSO); 1-METHYLPYRROLIDONE; The alcohols such as methyl alcohol, ethanol, propyl alcohol, isopropyl alcohol, glycerine, ethylene glycol, propylene glycol, diglycol, triethylene glycol, tetraethylene glycol or trimethylolpropane; The amine such as ethylenediamine or diethylene triamine equal solvent, but be not limited to these.In addition the potpourri of these solvents of more than a kind can also be used.Most preferred solvent is water.
The drying process of film is carried out after stretching process or matting 2.Dry process is undertaken by natural drying, in order to improve drying efficiency further, can utilize based on roller compression or utilize air knife or suction roll etc. carry out the moisture removing on surface and/or carry out air-supply drying.As dry treatment temperature, preferably carry out drying process at 20 DEG C ~ 100 DEG C, more preferably carry out drying process at 60 DEG C ~ 100 DEG C.The dry processing time can apply 30 seconds ~ 20 minutes, is preferably 5 minutes ~ 10 minutes.
The polyvinyl alcohol resin film polarization element utilizing above method can obtain permanance of the present invention to be improved.Even if the film of the absorption dichroic dye in polarization element is not polyvinyl alcohol resin, but the film obtained by amylose system resin, starch-series resin, cellulose-based resin, polyacrylate system resin etc., also can by containing dichroic dye, carry out stretching, carry out shearing orientation etc. and make hydrophilic resin carry out orientation to produce same polarization element, but the polarization element film formed by polyvinyl alcohol resin film is the most suitable.
By obtained polarization element one side or two-sided protective clear layer is set, obtained polaroid.Polymkeric substance can be utilized to make coating layer when protective clear layer is set or make the laminate layers of film.As forming the transparent polymer of protective clear layer or film, preferred mechanical intensity is high, the transparent polymer of good thermal stability or film.Material as protective clear layer use can enumerate acetyl cellulose resins or its film of such as triacetyl cellulose or diacetyl cellulose and so on; Acrylic resin or its film; Corvic or its film; Nylon resin or its film; Vibrin or its film; Polyarylate resin or its film; Norborene and so on take cyclic olefin as cyclic polyolefin resin or its film of monomer; Tygon, polypropylene; Ring system or there is polyolefin or its multipolymer of norborene skeleton; Main chain or side chain are resin or polymkeric substance or its film etc. of acid imide and/or acid amides.In addition, as protective clear layer, the resin with liquid crystal liquid crystal property or its film also can be set.The thickness of diaphragm is such as 0.5 μm ~ about 200 μm.By by resin of the same race or not of the same race wherein or film at one side or two-sidedly arrange more than 1 layer, make polaroid.
Above, in order to protective clear layer and polarization element be fitted, cementing agent (then drug) is needed.Be not particularly limited as cementing agent, preferably polyethylene alcohol system cementing agent.As polyethenol series cementing agent, such as GohsenolNH-26 (synthesis society of Japan manufactures), ExcevalRS-2117 (manufacture of KURARAY society) etc. can be enumerated, but be not limited to this.Crosslinking chemical and/or resistance to hydrated agent can be added in a binder.In polyethenol series cementing agent, use maleic anhydride-isobutylene copolymers, the cementing agent being mixed with crosslinking chemical can be used as required.As maleic anhydride-isobutylene copolymers, such as Isobam#18 (manufacture of KURARAY society), Isobam#04 (manufacture of KURARAY society), ammonia modification Isobam#104 (manufacture of KURARAY society), ammonia modification Isobam#110 (manufacture of KURARAY society), imidizate Isobam#304 (manufacture of KURARAY society), imidizate Isobam#310 (manufacture of KURARAY society) etc. can be enumerated.Water-soluble polynary epoxy compound can be used in crosslinking chemical now.As water-soluble polynary epoxy compound, such as DenacolEX-521 (manufacture of NagaseChemteX society), Tetrad-C (テ ト ラ ッ ト-C, Mitsui gas chemistry society manufactures) etc. can be enumerated.In addition, as the cementing agent beyond polyvinyl alcohol resin, the known cementing agent of carbamate system, acrylic acid series, epoxy and so on can also be used.In addition, for improving the cohesive force of cementing agent or improving the object of water tolerance, also can contain the additives such as zinc compound, chloride, iodide with the concentration of 0.1 % by weight ~ 10 about % by weight simultaneously.Additive is not also limited.After utilizing cementing agent laminating protective clear layer, by carrying out drying or thermal treatment at suitable temperature, obtain polaroid.
When the polaroid obtained according to circumstances such as conforms to the display device such as liquid crystal, organic electroluminescent, also can arrange for the layer or the film that improve angle of visibility, improve the various functional layer of contrast, there is brightness raising property as the protective seam of non-exposed surface or the surface of film afterwards.In order to make polaroid and these films or display device fit, preferably use bonding agent (adhesion drug).
This polaroid can opposite side surface, namely in the exposed surface of protective seam or film, there is anti-reflecting layer or the known various functional layer such as antiglare layer, hard conating.Have various functional layer, preferred coating process to make this, also can fitting by cementing agent or bonding agent, this has the film of function.In addition, various functional layer can be layer for control phase difference or film.
Utilize said method, polarization element of the present invention and polaroid can be obtained.The display screen employing polarization element of the present invention or polaroid be reliability high, there is high-contrast and there is the display screen of high color reprodubility for a long time.
The polarization element of the present invention so obtained arranges protective seam or functional layer and support etc. as required with the form of the polaroid with diaphragm, is used to liquid crystal projection apparatus, counter, clock and watch, notebook computer, word processor, liquid crystal TV set, spreadlight lens, polaroid glasses, auto navigation and indoor and outdoor tester or display etc.
Embodiment
Illustrate in greater detail the present invention below by embodiment, but the present invention is not limited thereto.It should be noted that, the evaluation of the transmitance shown in embodiment, degree of polarization is carried out as follows.In addition, hereinafter " part " refers to " weight portion ".
Each transmitance uses spectrophotometer (society of Hitachi manufactures " U-4100 ") to measure.
When using spectrophotometer (society of Hitachi manufactures " U-4100 ") to measure transmitance, the emitting side of light arrange be 43% based on JIS-Z8701 (illuminant-C 2 ° of visuals field) depending on the transmitance after sensitivity correction and degree of polarization be 99.99% iodine system polaroid (Polatechno society manufactures SKN-18043P), be incident to mensuration sample to enable absolute polarized light.The protective seam of iodine system polaroid is now the triacetyl cellulose without ultraviolet absorption ability.
To the incident definitely polarized light of polaroid of the present invention, the direction of vibration of this absolute polarized light orthogonal with the absorption direction of principal axis of polaroid of the present invention (the absorption axle of this absolute polarizer is parallel with the absorption axle of polaroid of the present invention) is measured, obtained absolute parallel transmitance is set to Ky; The direction of vibration of this absolute polarized light parallel with the absorption direction of principal axis of polaroid of the present invention (the absorption axle of this absolute polarizer is orthogonal with the absorption axle of polaroid of the present invention) is measured, obtained absolute orthogonal transmitance is set to Kz.
By absolute parallel transmitance Ky and absolute orthogonal transmitance Kz, obtain singleton transmittance Ts by following calculating formula (i).
Ts=(Ky+Kz)/2 formula (i)
By absolute parallel transmitance Ky and absolute orthogonal transmitance Kz, obtain degree of polarization ρ by following calculating formula (ii).
ρ=(Ky-Kz)/(Ky+Kz) formula (ii)
Embodiment A-1
The making > of < dyestuff
PABA is dissolved in 145 parts, water, joins in 140 parts, the water containing 35 % by weight hydrochloric acid 26 parts, add sodium nitrite 6.9 parts at 15 DEG C ~ 20 DEG C and carry out 1 hour diazotising.Next joined by N, in the aqueous solution that two (1-hydroxyl-3-sulfo group-6-naphthyl) amine of N-(trivial name: two J acid) 31.5 parts, 125 parts, water, 11 parts, sodium carbonate are formed, add soda ash solution further, keep pH8.5 ~ 9.5 simultaneously, utilize within 3 hours, carry out coupling at 20 DEG C, till confirming less than two azo-compounds in spot test, obtain two azo-compounds.Add in obtained solution into Zan qi salt (サ ヌ キ salt (Sanukisalt)), carry out saltouing, filtering, at 60 DEG C of evaporates to dryness, make the dyestuff represented by formula (4) of the application.
The making > of < polarization element
Be more than 99% by saponification degree, thickness is that the polyvinyl alcohol resin film (KURARAY society manufactures VF series) of 75 μm floods 2 minutes in the warm water of 40 DEG C, carry out swelling treatment.By the film immersion after swelling treatment in 45 DEG C of aqueous solution of the dyestuff 0.05 % by weight represented by the formula (4) containing the application, sodium tripolyphosphate 0.1 % by weight, carry out the absorption of dyestuff.To the film water cleaning of dyestuff be adsorbed, and after cleaning, utilize 40 DEG C of aqueous solution of the boric acid containing 2 % by weight to carry out boric acid process in 1 minute.The film obtained carrying out boric acid process stretches with 5.0 times, carries out process in 5 minutes in 55 DEG C of aqueous solution containing boric acid 3.0 % by weight simultaneously.This film carrying out boric acid process and obtain utilizes the water of 30 DEG C to carry out cleaning in 15 seconds when keeping tense situation.Carrying out dry process in 9 minutes at 70 DEG C immediately by processing the film obtained, making the polarization element that thickness is 28 μm, as mensuration sample.
Embodiment A-2
In embodiment A-1,4-amino-benzoic acid is replaced with 3-amino-4-methyl benzoic acid 16.2 parts, make the dyestuff represented by the application's formula (10), similarly make polarization element in addition, as mensuration sample.
Embodiment A-3
In embodiment A-1,4-amino-benzoic acid is replaced with 17.9 parts, 3-amino-4-methoxyl benzoic acid, make the dyestuff represented by the application's formula (16), similarly make polarization element in addition, as mensuration sample.
Embodiment A-4
In embodiment A-1,4-amino-benzoic acid is replaced with 3-methoxyl-4-amino-5-chlorobenzoic acid 19.8 weight portion, make the dyestuff represented by the application's formula (19), similarly make polarization element in addition, as mensuration sample.
Comparative examples A-1
Dyestuff represented by the application's formula (2) used in embodiment A-1 is replaced with two azo dyess of the C.I.Direct81 shown in non-patent literature 1, similarly make polarization element in addition, as mensuration sample.
Comparative examples A-2
Dyestuff represented by the application's formula (2) used in embodiment A-1 is replaced with two azo dyess shown in embodiment 1 of Japanese Patent Publication 7-92531, similarly make polarization element in addition, as mensuration sample.
Comparative examples A-3
Dyestuff represented by the application's formula (2) used in embodiment A-1 is replaced with two azo dyess shown in embodiment No.16 of Japanese Laid-Open Patent Publication 63-189803, similarly make polarization element in addition, as mensuration sample.
Comparative examples A-4
Dyestuff represented by the application's formula (2) used in embodiment A-1 is replaced with the dyestuff shown in compound example numbering 8 of No. 2985408, Jap.P., similarly make polarization element in addition, as mensuration sample.
Comparative examples A-5
In embodiment A-1,3-amino-4-methoxyl benzoic acid is replaced with 3-methoxyl-4-aminobenzenesulfonic acid, make two azo dyess with two J acid represented by following formula (21), similarly make polarization element in addition, as mensuration sample.
For obtained polarization element, use spectrophotometer U-4100 at 380nm ~ 780nm with 1nm measuring space Ky and Kz.In the degree of polarization ρ calculated by obtained Ky, Kz, the wavelength with most high-polarization is set to λ max.By when making the simple substance transmitance Ts at λ max place be about 40.5% ~ 41.5%, the degree of polarization ρ max at λ max place is shown in table 1.
[table 1]
λmax Ts max ρ max
Embodiment A-1 557 41.08 99.94
Embodiment A-2 563 40.91 99.90
Embodiment A-3 568 41.12 99.85
Embodiment A-4 565 40.95 99.88
Comparative examples A-1 519 41.13 99.95
Comparative examples A-2 589 41.41 94.82
Comparative examples A-3 578 40.81 99.77
Comparative examples A-4 620 40.60 94.68
Comparative examples A-5 552 41.48 93.65
Compare the degree of polarization ρ max at the λ max place of obtained polarization element, result is known: embodiment A-1 ~ A-4 has equal above degree of polarization compared with Comparative examples A-1 ~ A-5.Particularly, if compare with the Comparative examples A-5 with two same J acid, the known polarization element obtaining degree of polarization high about 6% ~ 7%.
Embodiment B-3
< light fastness test >
Use polyethenol series cementing agent, the tri acetyl cellulose membrane (Fujiphoto society manufactures TD-80U, hereinafter referred to as TAC) being 80 μm by the polarization element obtained in embodiment A-3 and the thickness having carried out alkali treatment carries out lamination according to the formation of polarization element/tack coat/TAC, and lamination obtains polaroid.
Obtained polaroid is cut into 40mm × 40mm, fit in the transparency glass plate of 1mm by bonding agent PTR-3000 (Japanese chemical drug society manufactures) according to the formation of polarization element/tack coat/TAC/ bonding coat/transparency glass plate, make light fastness test and evaluate sample.
In light fastness test, (SugaSeikiCo., Ltd. manufacture to utilize xenon arc testing machine; SX-75), carry out the light exposure experiment of 70 hours from polarization element side under the condition of 100W, blackboard temperature 89 DEG C, ambient humidity 30%, confirm that the change of Ky, Kz of front and back is penetrated in illumination, and calculate the contrast C R calculated by following formula (iii), compare the permanance for light.
CR=Ky/Kz formula (iii)
Comparative example B-1
The polarization element A-3 used in Embodiment B-3 is replaced with the polarization element obtained in comparative example B-1, similarly carries out the endurancing for light in addition.
Comparative example B-2
The polarization element A-3 used in Embodiment B-3 is replaced with the polarization element obtained in comparative example B-2, similarly carries out the endurancing for light in addition.
Comparative example B-3
The polarization element A-3 used in Embodiment B-3 is replaced with the polarization element obtained in comparative example B-3, similarly carries out the endurancing for light in addition.
Ky, Kz, the CR at the λ max place before the long duration test of the polaroid obtained in Embodiment B-1, comparative example B-1 ~ comparative example B-3 and after light fastness test are shown in table 2.
[table 2]
As shown in Table 2, the dyestuff of the application is compared with comparative example B-1 ~ comparative example B-3, and the photostability for light improves tremendously, suppressed more than 2 times of the reduction of contrast.
From table 1 and table 2: about the dyestuff of the application, polarity is high as shown in Table 1, the polarization element with the equal above degree of polarization with the polaroid dyestuff used in the past can be obtained; In addition as shown in Table 2, obtain the contrast being not less than existing polaroid reduce few, for the high polaroid of the photostability of light.Also known thus, the polaroid of the present embodiment has high polarizing coefficient and high temperature and the long-time photostability exposed is also excellent.By polarization element of the present invention or polaroid are used in liquid crystal projection apparatus, counter, clock and watch, notebook computer, word processor, liquid crystal TV set, spreadlight lens, polaroid glasses, auto navigation and indoor and outdoor tester or display etc., even if do not use the dyestuff belonging to particular chemicals of dianisidine and so on can obtain having the liquid crystal display and lens etc. of high stability yet.

Claims (4)

1. a polarization element, it is by containing polyvinyl alcohol resin or derivatives thereof and dichroic dye and the polarization element that forms of the film stretched, it is characterized in that, the azo-compound represented by formula (1) that at least one of this dichroic dye is free acid form or its salt
In formula, A represents the phenyl with at least 1 carboxyl alternatively base.
2. a polaroid, its one side at polarization element according to claim 1 or be two-sidedly provided with protective seam.
3. a liquid crystal indicator, it has polarization element according to claim 1 or polaroid according to claim 2.
4. a spreadlight lens, it has polarization element according to claim 1 or polaroid according to claim 2.
CN201380009089.1A 2012-02-28 2013-02-19 Dyestuff system polarization element and polaroid Active CN104160305B (en)

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