CN103308969A - Method of manufacturing polarizing plate - Google Patents
Method of manufacturing polarizing plate Download PDFInfo
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- CN103308969A CN103308969A CN2013100572171A CN201310057217A CN103308969A CN 103308969 A CN103308969 A CN 103308969A CN 2013100572171 A CN2013100572171 A CN 2013100572171A CN 201310057217 A CN201310057217 A CN 201310057217A CN 103308969 A CN103308969 A CN 103308969A
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- Prior art keywords
- protective film
- transparent protective
- amplitude
- polaroid
- polarization plates
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
Abstract
The present invention relates to a method of manufacturing a polarizing plate. Even if a difference between dimensional change rates of a first transparent protective film and a second transparent protective film is large, the polarizing plate obtained by the method can be prevented from curling. The polarizing plate is strip shaped, and is produced by pasting the first transparent protective film on a surface of the polarizing plate via adhesives, and pasting the second transparent protective film on the other surface of the polarizing plate via adhesives. When the dimensional change rate (%) of the first transparent protective film is set to be L1, and the dimensional change rate (%) of the second transparent protective film is set to be L2, the absolute value of the difference (L1-L2) is greater than 0.1. In the amplitude direction of the polarizing plate, the width w (mm) of the adhesives which exist towards the outside from the end of the polarizing plate satisfies 0<=w<=75.
Description
Technical field
The present invention relates to the manufacture method of polarization plates.The polarization plates that obtains by manufacture method of the present invention can form image display devices such as liquid crystal indicator, organic EL display, PDP separately or with the form of blooming that it is laminated with it.
Background technology
In liquid crystal indicator, be indispensable at the both sides of the glass substrate that is formed the liquid crystal panel surface by its image forming mode configuration polaroid.Polaroid is usually by after dyeing to the polyvinyl alcohol (PVA) mesentery with dichroic material such as iodine, and it is crosslinked to use crosslinking chemical to carry out, and carries out uniaxial tension film processed, obtains thus.In addition, the polyvinyl alcohol (PVA) mesentery uses hydrophilic polymer, therefore especially is very easy to distortion under humidified condition.In addition, because a little less than the physical strength of film itself, so there is cracked and so on the problem of film.Therefore, use in the both sides of polaroid or one-sided make strength-enhanced with transparent protective film such as applying triacetyl celluloses such as polyethenol series tackifier polarization plates.
As the method for making common polarization plates, known have at the transparent protective film of the two sides of polaroid configuration through washing, across tackifier, it passed through between pair of rolls at the interlayer of polaroid and transparent protective film, uses the method for oven drying then.
Transparent protective film is easy to generate change in size at drying stage.But, as mentioned above, when making the method for common polarization plates, use tackifier behind applying transparent protective film on the polaroid, implement drying process.In this drying process, if transparent protective film etc. produce change in size and take place on the polarization plates to curl, then in the manufacturing process of continuous polarization plates, make the problem of polarization plates movability variation.Especially under the different situation of the size changing rate of the transparent protective film on the two sides that fits in polaroid, take place easily to curl, operating efficiency is descended.
As the method for curling that suppresses polarization plates, for example propose to have the method (patent documentation 1) of the reduced thickness that makes transparent protective film.In addition, propose to have when making polarization plates, behind 1 transparent protective film of single-sided lamination of polaroid, in the method (patent documentation 2) of the remaining other a slice transparent protective film of single-sided lamination.
The prior art document
Patent documentation 1: TOHKEMY 2001-235625 communique
Patent documentation 2: TOHKEMY 2004-117482 communique
Summary of the invention
The polarization plates that is obtained by patent documentation 1,2 suppresses the effect of curling though have, and the structure of polarization plates itself does not change, and does not study from the viewpoint of the curling generation of the end that suppresses polarization plates.
The objective of the invention is to; a kind of manufacture method of polarization plates is provided; be a face of polaroid across tackifier fit the 1st transparent protective film, make the method for polarization plates at another face across tackifier the 2nd transparent protective film of fitting; even if this polarization plates also can suppress curling under the big situation of the difference of the size changing rate of the 1st transparent protective film and the 2nd transparent protective film.
The inventor etc. have carried out research repeatedly for solving above-mentioned problem, found that by the manufacture method of the following polarization plates that illustrates and can reach above-mentioned purpose, so that finished the present invention.
Namely the present invention relates to a kind of manufacture method of polarization plates, it is characterized in that, its for a face of polaroid across tackifier fit the 1st transparent protective film, make the method for rectangular polarization plates at another side across tackifier the 2nd transparent protective film of fitting,
In the 1st transparent protective film and the 2nd transparent protective film, when the size changing rate that the size changing rate (%) of the 1st transparent protective film is made as L1, the 2nd transparent protective film was made as L2 (%), the absolute value of poor (L1-L2) of size changing rate satisfied more than 0.10,
And the amplitude of polaroid is below the amplitude of the 1st transparent protective film and the 2nd transparent protective film, and on the amplitude direction of polaroid, the amplitude w (mm) of the tackifier that exists laterally from the end of the both sides of polaroid satisfies 0≤w≤75.
In the manufacture method of above-mentioned polarization plates, can use the amplitude diaphragm different with the 2nd transparent protective film of the 1st transparent protective film.
The effect of invention
In the manufacture method of polarization plates of the present invention, as the transparent protective film of fitting on the two sides of polaroid, use the big diaphragm of difference of size changing rate, in existing manufacture method, take place easily to curl in the end of polarization plates.The reason of the generation that should curl is as can be known: when sticking with glue the transparent protective film of agent applying ratio polarization sheet amplitude broad at polaroid, in the end of the polarization plates that obtains, be by tackifier rather than across polaroid constraint transparent protective film.
In the manufacture method of polarization plates of the present invention; the amplitude of employed polaroid is below the amplitude of transparent protective film; but in the amplitude direction of polaroid, do not have tackifier laterally from the end of polaroid or according to using tackifier in the mode that has tackifier below the regulation amplitude.Like this, in the manufacture method of polarization plates of the present invention, comparing the more lateral with the end of the amplitude direction of polaroid, at the transparent protective film of the two sides of polaroid configuration, its be not across polaroid but stick with glue part that agent fitted controlled make less.Consequently, at the central part of polarization plates, polaroid becomes supporting mass and suppresses curling, even if simultaneously comparing the more lateral with the end of the amplitude direction of polaroid, the amplitude of the tackifier of the reason that becoming curls takes place is controlled make less.Therefore, even if think and use under the situation of the big transparent protective film of the difference of size changing rate on the two sides of polaroid, also can be suppressed at curling that the end of polarization plates produces.
In addition, in the manufacture method of polarization plates of the present invention, as the transparent protective film that arranges on the two sides of polaroid, by the different transparent protective film of use amplitude, can be suppressed at curling that the end of the amplitude direction of polarization plates produces thus effectively.Under the different situation of the amplitude of the transparent protective film that uses on the two sides of polaroid, a side's of amplitude broad transparent protective film can be freely flexible in the amplitude direction, can be suppressed at curling that the end of the amplitude direction of polarization plates produces effectively.
According to the manufacture method of polarization plates of the present invention, even if when using the different diaphragm of size changing rate as the transparent protective film on the two sides that is arranged at polaroid, the fabrication phase that also can be suppressed at polarization plates takes place to curl production polarization plates stably.Thus, the selection degree of freedom that can realize transparent protective film uprises, the optical design of amplitude broad becomes the liquid crystal indicator (LCD) of possibility, high resolving power and high-contrast, el display device image display devices such as (ELD).
Description of drawings
Fig. 1 is the sectional view of an example of the expression embodiment relevant with the manufacture method of polarization plates of the present invention.
Fig. 2 is the sectional view of an example of expression other embodiments relevant with the manufacture method of polarization plates of the present invention.
Fig. 3 is the sectional view of an example of expression other embodiments relevant with the manufacture method of polarization plates of the present invention.
Fig. 4 is the sectional view of an example of expression other embodiments relevant with the manufacture method of polarization plates of the present invention.
Embodiment
Below, following explanation is carried out with reference to the accompanying drawing limit pair embodiment relevant with the manufacture method of polarization plates of the present invention in the limit.Fig. 1～Fig. 4 is the sectional view of an example of the expression polarization plates relevant with manufacture method of the present invention.As Fig. 1～shown in Figure 4, in the manufacture method of polarization plates of the present invention, across tackifier (a1, a2) the 1st transparent protective film T1 and the 2nd transparent protective film T2 are set on the two sides of polaroid P.The amplitude W of above-mentioned polaroid P
pBe the amplitude W of the 1st transparent protective film T1
T1And the amplitude W of the 2nd transparent protective film T2
T2Below.In the polarization plates of Fig. 1, Fig. 2, represent above-mentioned amplitude W
T1, W
T2Identical situation.In the polarization plates of Fig. 3, Fig. 4, represent above-mentioned amplitude W
T1＞W
T2Situation.
In addition, the polarization plates of Fig. 1, Fig. 3 record is in the both sides of the amplitude direction of polaroid, and the 1st transparent protective film T1 and the 2nd transparent protective film T2 are not across polaroid P but the situation of utilizing tackifier (a3) to be fitted laterally.In addition, the polarization plates of Fig. 2, Fig. 4 record is the amplitude W of polaroid
pConsistent with the amplitude of tackifier (a1, a2) and do not have the situation of tackifier in the outside of comparing with the end of the amplitude direction of polaroid P.
In the polarization plates of Fig. 1, Fig. 3 record, on the amplitude direction of polaroid P, there is tackifier (a3) to exist laterally from the end of the both sides of polaroid P.This tackifier (a3) applying the 1st transparent protective film T1 and the 2nd transparent protective film T2.The amplitude w that is present in the above-mentioned tackifier (a3) in the outside of comparing with the end of the both sides of polaroid P represents with w1, w2 respectively.Amplitude w1, the w2 of above-mentioned tackifier (a3) can be the same or different.
In the polarization plates of Fig. 1, Fig. 3 record, if the amplitude w (w1, w2) of above-mentioned tackifier (a3) is too wide, then carry out aspect polarization plates good mobile not preferred.The amplitude w (mm) of above-mentioned tackifier (a3) is controlled so as to 0≤w≤75.From the viewpoint of manufacturing process, the amplitude w of above-mentioned tackifier (a3) is preferably 10≤w≤75, and then the viewpoint from suppressing to curl, and is preferably 10≤w≤60.Need to prove that in the polarization plates of Fig. 1, Fig. 3 record, the situation of w=0 is that the amplitude Wp of polaroid is consistent with the amplitude of tackifier (a1, a2), suitable with the polarization plates of Fig. 2, Fig. 4 record.
The amplitude W of above-mentioned polaroid
p(mm) common preferred 300～2000mm.On the other hand, the amplitude W of the 1st transparent protective film T1
T1(mm) and the amplitude W of the 2nd transparent protective film T2
T2(mm) be the amplitude W of above-mentioned polaroid P
p(mm) more than.Usually the amplitude of preferred the 1st transparent protective film and the 2nd transparent protective film is 350～2300mm.
Need to prove the amplitude W of the 1st transparent protective film T1
T1(mm) and the amplitude W of the 2nd transparent protective film T2
T2(mm) than the amplitude W of polaroid P in the polarization plates of Fig. 1 record
p(mm) add that the length of amplitude w of tackifier (a3) is long, and than the amplitude W of polaroid P in the polarization plates of Fig. 2 record
p(mm) also long.
In addition; in the manufacture method of polarization plates of the present invention; for the 1st transparent protective film T1 and the 2nd transparent protective film T2; the size changing rate (%) of stating the 1st transparent protective film T1 is made as the size changing rate (%) of L1, above-mentioned the 2nd transparent protective film T2 when being made as L2; the absolute value of change in size rate variance (L1-L2) is more than 0.10, can be effective to the big situation of size changing rate.Need to prove that from ambulant viewpoint, the absolute value of above-mentioned change in size rate variance (L1-L2) is preferred below 0.15.Need to prove, be the 1st transparent protective film T1 more than 0.10 and the selection of the 2nd transparent protective film T2 as the absolute value of change in size rate variance (L1-L2), can be by the material difference, thickness is different adjust.
In addition, as shown in Figure 3, Figure 4, as the polarization plates relevant with manufacture method of the present invention, can use the amplitude W of the 1st transparent protective film T1
T1Amplitude W with the 2nd transparent protective film T2
T1Different diaphragms.By the different transparent protective film of use amplitude, even if under the situation of using the different transparent protective film of size changing rate, also can suppress the generation of curling of polarization plates.The amplitude W of the 1st transparent protective film T1
T1(mm) than the amplitude W of polaroid P in the polarization plates of Fig. 3 record
p(mm) add that the length of amplitude w of tackifier (a3) is long, and than the amplitude W of polaroid P in the polarization plates of Fig. 4 record
p(mm) also long.
As shown in Figures 1 to 4, as the amplitude W of at least a kind of transparent protective film arbitrarily
tRatio is with polaroid W
pAnd the long such scheme of the length of the amplitude w addition of tackifier (a3), it is preferred producing aspect curling in the end of the amplitude direction that effectively is suppressed at polarization plates.
In the polarization plates of above-mentioned Fig. 3, Fig. 4 record; under the situation of the 1st transparent protective film T1 than the 2nd transparent protective film T2 amplitude broad; as the 1st transparent protective film, the material that use the material big than the 2nd transparent protective film T2 size changing rate (%), namely satisfies L1＞L2 is effective suppressing aspect curling.
Below polaroid, transparent protective film, the tackifier that uses in the polarization plates of the present invention described.
Polaroid can use various polaroids ad lib.As polaroid, can enumerate and polyvinyl alcohol (PVA) mesentery, part dimethoxym ethane polyvinyl alcohol (PVA) mesentery, ethylene-vinyl acetate copolymer pastern are divided adsorb dichroic material such as iodine, dichroic dye on the hydrophilic macromolecule films such as saponification film and carry out the film that uniaxial tension forms; Polyenes such as the desalination acid treatment thing of the processed thing of polyethenol series, Polyvinylchloride are alignment films etc.In these, the preferred polaroid that is constituted by dichroic substance such as polyvinyl alcohol (PVA) mesentery and iodine.Thickness to these polaroids is not particularly limited, but is generally about 5～80 μ m.The thickness of polaroid is preferably 15～35 μ m.
, can dye by for example polyethenol series being impregnated into the aqueous solution of iodine to polyvinyl alcohol (PVA) mesentery dyeing and carry out the polaroid that uniaxial tension forms with iodine, and be stretched to 3～7 times of former length and make.Also can be impregnated into as required in the aqueous solution of boric acid, potassium iodide etc.And then also can before dyeing, the polyethenol series film immersion be washed in water as required.By the polyvinyl alcohol (PVA) mesentery is washed, can wash dirt, the antiblocking agent on polyvinyl alcohol (PVA) mesentery surface thus, in addition, also have inhomogeneous effects such as the stain of preventing by making polyvinyl alcohol (PVA) mesentery swelling.Stretching can be carried out after with iodine staining, also can stretch on the Edge Coloring limit, can also use iodine staining in addition after stretching.Even in the aqueous solution of boric acid or potassium iodide etc. or also can stretch in the water-bath.
As the transparent protective film that arranges on the two sides of above-mentioned polaroid and form the material of transparent protective film, excellent materials such as preferably clear, physical strength, thermal stability, moisture blocking-up property, isotropy.Can enumerate for example polyester such as polyethylene terephthalate, PEN based polymer; Cellulose-based polymkeric substance such as diacetyl cellulose, triacetyl cellulose; Acrylic acid series polymeric compounds such as polymethylmethacrylate; Polystyrene, acrylonitritrile-styrene resin styrenics such as (AS resins); Polycarbonate based polymer etc.In addition; as the example of the polymkeric substance that forms above-mentioned transparent protective film, also can enumerate tygon; polypropylene; ring system or the polyolefin with norborene structure; polyolefin polymkeric substance as ethylene-propylene copolymer; vinyl chloride-based polymer; acid amides such as nylon or aromatic polyamide based polymer; the imide series polymkeric substance; the sulfone based polymer; the polyethersulfone based polymer; the polyetheretherketone based polymer; the polyphenylene sulfide based polymer; vinyl alcohol system polymer; the vinylidene chloride based polymer; the polyvinyl butyral based polymer; the arylide based polymer; the polyoxyethylene methylene based polymer; the epoxy based polymer; or above-mentioned mixture of polymers etc.Can contain any proper additive more than a kind in the transparent protective film.As adjuvant, can enumerate for example ultraviolet light absorber, antioxidant, lubrication prescription, plasticiser, release agent, painted agent, fire retardant, nucleator, antistatic agent, pigment, the colorant etc. of preventing.The content of the above-mentioned thermoplastic resin in the transparent protective film is preferably 50～100 weight %, 50～99 weight % more preferably, and then be preferably 60～98 weight %, be preferably 70～97 weight % especially.The content of the above-mentioned thermoplastic resin in transparent protective film is under the situation below the 50 weight %, possibly can't fully show high transparent that thermoplastic resin had originally etc.
As transparent protective film of the present invention, the preferred use from celluosic resin (polymkeric substance), polycarbonate resin (polymkeric substance), cyclic polyolefin resin (ring system or the polyolefin with norborene structure) reaches any a kind that selects (methyl) acryl resin.
Though the thickness of transparent protective film can suitably be determined, from viewpoints such as operation, thin layer such as intensity, the property handled, is about 1～500 μ m usually.Especially preferred 1～300 μ m, more preferably 5～200 μ m.
Can implement easy bonding processing with the bonding face of the polaroid of transparent protective film.As easy bonding processing, can enumerate dry process such as Cement Composite Treated by Plasma, corona treatment; The chemical treatment of alkali treatment (saponification processing) etc.; Form the coating processing of easy adhesive linkage etc.In these, be preferably formed coating processing, the alkali treatment of easy adhesive linkage.Easily can use various easy adhesivess such as polyol resin, polycarboxylic acid resin, vibrin in the formation of adhesive linkage.Need to prove that easily the thickness of adhesive linkage preferably is made as about 0.001～10 μ m usually, further preferably is made as about 0.001～5 μ m, especially preferably is made as about 0.001～1 μ m.
For the face of the not bonding polaroid of above-mentioned transparent protective film, also can implement hard conating or antireflection handle, with anti-stick company, diffusion or anti-dazzle be the processing of purpose.
Need to prove, above-mentioned anti-reflection layer, anti-adhering layer, diffusion layer, antiglare layer etc., except can being arranged to transparent protective film itself, also can be to arrange as other optical layers and with the form of the distinguishing layer of transparent protective film.
The tackifier that uses in the formation as the adhesive layer of fit above-mentioned polaroid and transparent protective film is not particularly limited, but preferred water system tackifier.
As the water system tackifier, be not particularly limited, but for example illustration vinyl polymerization system, gelatin system, ethene base system latex system, polyurethane series, isocyanate-based, polyester system, epoxy system etc.As above-mentioned water system tackifier, preferred use contains the tackifier of polyvinyl etc., and as polyvinyl, preferably polyethylene alcohol is resin.Especially under the situation of polymer film as polaroid of using polyethenol series, from the viewpoint of cementability, preferred use contains the tackifier of polyvinyl alcohol resin.
As polyvinyl alcohol resin, can enumerate the polyvinyl alcohol (PVA) that the polyvinyl acetate (PVA) saponification is obtained; Its derivant; And then multipolymer saponified that can enumerate vinyl acetate and the monomer with copolymerization; The modified polyvinylalcohol system that polyethenol series acetalation, urethane, etherificate, grafting, Phosphation etc. are formed.As above-mentioned monomer, can enumerate unsaturated carboxylic acid and ester classes thereof such as maleic acid (acid anhydride), fumaric acid, crotonic acid, itaconic acid, (methyl) acrylic acid; Alpha-olefin such as ethene, propylene, (methyl) allyl sulphonic acid (interior), sodium sulfonate (monoalkyl maleate), sodium disulfonate alkyl maleate, N hydroxymethyl acrylamide, acrylamide alkyl sulfonic acid alkali metal salt, N-vinyl pyrrolidone, N-vinyl pyrrolidone derivant etc.These polyvinyl alcohol resins can be used alone or and with more than two kinds.
Above-mentioned polyvinyl alcohol resin is not particularly limited, and from the viewpoint of cementability, average degree of polymerization is about 100～5000, is preferably 1000～4000, and average saponification degree is about 85～100 moles of %, preferred 90～100 moles of %.
As above-mentioned polyvinyl alcohol resin, from improving the viewpoint of permanance, more preferably use the polyvinyl alcohol resin that for example has acetoacetyl.The polyvinyl alcohol resin that contains acetoacetyl reacts polyvinyl alcohol resin and dienone by known method and obtains.For example can enumerate polyvinyl alcohol resin is dispersed in the acetic acid equal solvent again to the method for wherein adding dienone; Polyvinyl alcohol resin is dissolved in the dimethyl formamide Huo diox equal solvent in advance again to method of wherein adding dienone etc.In addition, can enumerate the method that polyethenol series and dienone gas or aqueous dienone are directly contacted.
Contain the acetoacetyl modification degree of the polyvinyl alcohol resin of acetoacetyl, then be not particularly limited more than the % as long as be 0.1 mole.When being lower than 0.1 mole of %, the water tolerance of adhesive layer is insufficient, so improper.About preferred 0.1～40 mole of % of acetoacetyl modification degree, further preferred 1～20 mole of %, preferred especially 2～7 moles of %.If acetoacetyl modification degree surpasses 40 moles of %, the raising effect of water tolerance is little.Acetoacetyl modification degree is the value of utilizing NMR to measure.
In addition, the adhesive layer by above-mentioned water system tackifier forms when the preparation of its aqueous solution, can also cooperate crosslinking chemical or catalyzer such as other adjuvant, acid as required.
As crosslinking chemical, can use the crosslinking chemical that uses in the polyethenol series tackifier with being not particularly limited.Can use and contain at least 2 and have the compound of reactive functional group with above-mentioned polyvinyl alcohol resin.For example can enumerating, ethylenediamine, triethylenediamine, hexamethylene diamine etc. have the Alkylenediamine class of alkylidene and 2 amino; Benzal diisocyanate, hydrogenation benzal diisocyanate, trimethylolpropane benzal diisocyanate adduct (adduct), triphenylmethane triisocyanate, di-2-ethylhexylphosphine oxide (4-phenylmethane triisocyanate), isophorone diisocyanate and isocyanates such as these ketoxime end-blocking thing or phenol end-blocking thing; Ethylene glycol bisthioglycolate glycidyl ether, polyglycol diglycidyl ether, glycerine two or triglycidyl group ether, 1, epoxiess such as 6-hexane diol diglycidyl ether, trimethylolpropane tris glycidyl ether, diglycidylaniline, diglycidyl amine; Single aldehydes such as formaldehyde, acetaldehyde, propionic aldehyde, butyraldehyde; Glyoxal, twain-aldehyde compound such as MDA, butanedial, glutaraldehyde, maleic dialdehyde, o-phthalaldehyde(OPA); The amino-formaldehyde resins such as condensation product of hydroxymethyl urea, methylol melamine, alkylation hydroxymethyl urea, alkylation methylolation melamine, methyl guanamines, benzene guanamine and formaldehyde; Zirconium compoundss such as zirconium acetate, zirconium nitrate, zirconium carbonate, zirconium hydroxide, hydrochlorate zirconium; The glyoxalic acid slaine (as metal, can be enumerated for example alkaline metal such as lithium, sodium, potassium, alkaline-earth metals such as magnesium, calcium, transition metal such as titanium, zirconium, chromium, manganese, iron, cobalt, nickel, copper, zinc, aluminium etc.), the glyoxalic acid amine salt (as amine, can enumerate for example ammonia, monomethyl amine, dimethyl amine, Trimethylamine etc.) wait glyoxylate; Have basic group more than 1 and amino acid or the sulfur-containing amino acid of the acidic-group more than 1; Acetal compounds such as dimethoxy acetaldehyde, diethoxy acetaldehyde, dialkoxy acetaldehyde; And then can enumerate salt and the oxide thereof of divalent metals such as sodium, potassium, magnesium, calcium, aluminium, iron, nickel or trivalent metal.These compounds can be used alone or and with more than two kinds.In these, the preferred basic group that has more than 1 and amino acid or the sulfur-containing amino acid of 1 above acidic-group of using.Preferably amino as basic group, as the preferred carboxyl of acidic-group or sulfo group.As above-mentioned amino acid, for example can enumerate glycocoll, alanine, phenylalanine, pick propylhomoserin, leucine, isoleucine, lysine, proline, serine, threonine, tryptophane, histidine, tyrosine, arginine, asparagine, aspartic acid, Aspartame, glutamate, glutamic acid, and these amino acid and (methyl) acrylic acid multipolymer etc.As above-mentioned sulfur-containing amino acid, for example can enumerate methionine, halfcystine, cystine, and taurine etc.In these, preferred especially taurine etc. has the sulfur-containing amino acid of sulfo group.In addition, as crosslinking chemical, can use coupling agents such as silane coupling agent, titanium coupling agent.
The use level of above-mentioned crosslinking chemical, can be according to suitably designs such as the kinds of polyvinyl alcohol resin, but with respect to polyvinyl alcohol resin 100 weight portions, be generally about 0.1～50 weight portion, be preferably about 0.2～30 weight portion, more preferably 0.5～20 weight portion.In this scope, can obtain good cementability.
In addition, can contain the metallic compound filler in the above-mentioned tackifier.Can control the flowability of adhesive layer by the metallic compound filler, make the thickness stabilization, can access have good surface appearance, in the face evenly and cementability do not have uneven polarization plates.
In the manufacture method of polarization plates of the present invention, can make by using tackifier applying transparent protective film and polaroid.Particularly, the manufacture method of polarization plates of the present invention, the operation by being implemented in polaroid and/or transparent protective film coating binder and utilize the operation of tackifier applying polaroid and transparent protective film to carry out.Need to prove, between the transparent protective film of using tackifier or polaroid, undercoat, easy bonding processing layer etc. can be set.
The coating of above-mentioned tackifier can be in transparent protective film, polaroid arbitrarily on carry out, also can on both, carry out.The coating of above-mentioned tackifier is that mode about 10～300nm is carried out according to the thickness at the dried adhesive layer that forms between polaroid and the transparent protective film preferably.From obtaining thickness in the uniform face and obtain the viewpoint of sufficient bonding force, the thickness of adhesive layer is 10～200nm more preferably, is preferably 20～150nm especially.Under the situation of the not enough 10nm of the thickness of adhesive layer, bonding force is insufficient, is surpassing under the situation of 300nm the tendency that exists optics reliability and moisture-proof to reduce.
Coat operations to above-mentioned tackifier is not particularly limited, can adopt photogravure coating process, mould to be coated with various means such as method, roller coating process, spray application method, dip coating method, from the viewpoint of adhesive coating equably, preferred photogravure coating process, mould are coated with method.
Method as the thickness of adjusting adhesive layer is not particularly limited, and can enumerate the method for the apparatus for coating of the solid component concentration of for example adjusting adhesive solvent, tackifier.Assay method as such adhesive layer thickness is not particularly limited, but the preferred section that utilizes SEM (Scanning Electron Microscopy), TEM (Transmission Electron Microscopy) that uses is observed mensuration.The coating of tackifier operation is not particularly limited, can this rolling method, various means such as spray-on process, infusion process.
Behind coating binder, utilize applying polaroid and transparent protective films such as roll-type laminating machine.After applying, implement drying process.Baking temperature is about 5～150 ℃, is preferably 30～120 ℃, is more than 120 seconds, is preferably more than 300 seconds drying time.
The polarization plates of utilizing manufacture method of the present invention to obtain can be as the blooming that is laminated with other optical layers in practicality.Be not particularly limited for this optical layers, but for example can use the optical layers that is used to form liquid crystal indicators such as reflecting plate or half transmitting plate, polarizer (comprising 1/2,1/4 equiwavelength's plate), compensation film for angular field of view etc. sometimes more than 1 layer or 2 layers.The reflection type polarizer that forms particularly preferably in further stacked reflecting plate or Transflective plate on the polarization plates of the present invention or Semitransmissive polarization plates, in the further elliptic polarization plate or circularly polarizing plate, the wide visual angle polarization plates that stacked compensation film for angular field of view forms on polarization plates or the polarization plates that forms at the further stacked brightness improving film of polarization plates that form of laminated phase-difference plate on the polarization plates.
Polarization plates of the present invention or blooming can be preferred for forming in various devices such as liquid crystal indicator etc.The formation of liquid crystal indicator can be implemented according to existing method.Be liquid crystal indicator usually can by suitable installation liquid crystal cells and polarization plates or blooming, and as required the component parts assembling driving circuit etc. of illuminator etc. form, among the present invention, except use utilizes the polarization plates or this point of blooming that the present invention forms, other are not particularly limited, can be according to existing method.Even if for liquid crystal cells, also can use for example liquid crystal cells of any types such as TN type, STN type, π type.
One-sided or the both sides that can be formed on liquid crystal cells dispose the liquid crystal indicator of polarization plates or blooming, the illuminator use is backlight or the suitable liquid crystal indicators such as device of reflecting plate.At this moment, the one-sided or both sides that utilize polarization plates that the present invention forms or blooming can be arranged on liquid crystal cells.Arrange in both sides under the situation of polarization plates or blooming, these both can be the same or different.And then, when forming liquid crystal indicator, can dispose for example diffuser plate more than 1 layer or 2 layers, antiglare layer, antireflection film, fender, prism array, lens array sheet, light diffusing sheet, suitable parts such as backlight in position.
[embodiment]
Below utilize embodiment and comparative example that the present invention is further specified, but the present invention is not limited by these embodiment and comparative example.
The mensuration of＜size changing rate 〉
Transparent protective film is cut into 10cm * 10cm, and the size of the diaphragm in the time of will dropping into 1 hour under 60 ℃, the environment of 90%R.H. is as a (cm).The size of the diaphragm in the time of then, will dropping into 24 hours under 80 ℃ environment is as b (cm).Then, calculate size changing rate with following calculating formula.
Size changing rate (%)=(a-b)/a} * 100
Need to prove, about size changing rate, estimated the size changing rate that is positioned at the amplitude direction when being used for polarization plates.
＜transparent protective film 〉
As transparent protective film, use the following diaphragm that illustrates.
The amplitude of transparent protective film is 1330mm.
1: annular ethylene series resin film (the JSR corporate system: ARTON) of thickness 25 μ m; Size changing rate=0.0763
2: the annular ethylene series resin film (JSR corporate system: ARTON)) of thickness 35 μ m; Size changing rate=0.0515
3: tri acetyl cellulose membrane (the KONICA corporate system: KC4UYW) of thickness 40 μ m; Size changing rate=0.2011
The making of＜polaroid 〉
Polyvinyl alcohol (PVA) mesentery ((strain) Kuraray system: VF-PS7500 of used thickness 75 μ m, amplitude 1000mm or amplitude 2600mm), 60 seconds were flooded in the limit in 30 ℃ pure water to be stretched to stretching ratio be 2.5 times on the limit, in 30 ℃ iodine aqueous solutions (weight ratio: dyeed for 45 seconds pure water/iodine (I)/potassium iodide (KI)=100/0.01/1), being 5.8 times with stretching ratio in 4 weight % boric acid aqueous solutions stretches, dipping is after 10 seconds in pure water, under the state of the tension force that has kept film, 60 ℃ of dryings 3 minutes, obtained polaroid.The thickness of this polaroid is 25 μ m, and amplitude is 446mm or amplitude 1160mm.
The preparation of＜tackifier 〉
(Japanese synthetic chemical industry (strain) system: Ecomaty) (big Japanese ink chemical industry (strain) system: WATERSOL) 35 weight portions are dissolved in pure water 3760 weight portions, preparation tackifier aqueous solution for 100 weight portions and crosslinking chemical with polyvinyl alcohol resin.
(making of polarization plates)
At above-mentioned transparent protective film 1 (the annular ethylene series resin film of the thickness 25 μ m) single face of amplitude 1330mm, be that the mode of 80nm is coated with above-mentioned tackifier aqueous solution with the thickness of dried adhesive layer, obtain the transparent protective film 1 with tackifier.On the other hand, at the single face of the above-mentioned transparent protective film 2 (tri acetyl cellulose membranes of thickness 40 μ m) of amplitude 1330mm, be that the mode of 80nm is coated with above-mentioned tackifier aqueous solution with the thickness of dried adhesive layer, obtained the transparent protective film 2 of band tackifier.With respect to the transparent protective film 1 and 2 of above-mentioned band tackifier, the mode that the amplitude of tackifier of the coating of tackifier after according to coating is identical with the amplitude of the polaroid of amplitude 1160mm and carry out according to the roughly the same mode in position at the uncoated tackifier in both sides of each transparent protective film 1 and 2.Then; under 23 ℃ temperature conditions; two sides at the polaroid of above-mentioned amplitude 1160mm; be respectively the mode of 0mm with the amplitude w of the tackifier that on the amplitude direction of polaroid, exists laterally from the end of the both sides of polaroid, simultaneously with the fit transparent protective film 1 and 2 of above-mentioned band tackifier of roller machine.Then, at 80 ℃ of drying processes of implementing 10 minutes, made polarization plates.The polarization plates of attaining the Way is that the tackifier amplitude w of the amplitude direction of polarization plates is 0mm, shown in Fig. 2 mode.
In embodiment 1; as shown in table 1; the amplitude w (amplitude of both sides is set at identical) of the tackifier that exists laterally except the kind of the amplitude that changes polaroid, the 1st transparent protective film, the 2nd transparent protective film or from the end of polaroid, similarly to Example 1, made polarization plates.Need to prove that shown in the mode of Fig. 2, the situation beyond it is shown in the mode of Fig. 1 when the tackifier amplitude w of the amplitude direction of polarization plates is 0mm for the polarization plates that obtains.In the mode of Fig. 1, with respect to transparent protective film 1 and the coating 2, tackifier of above-mentioned band tackifier, consider the amplitude w of the tackifier that exists laterally from the end of polaroid, control the amplitude of the tackifier of coating.
In above-described embodiment and the comparative example, when making polarization plates, carry out following evaluation.Evaluation result is shown in table 1.
(movability)
In the circuit of the making of polarization plates, obtain the movability of polarization plates with following benchmark checking.Zero: can move.*: can not move.
[table 1]
Symbol description
The P polaroid
T1 the 1st transparent protective film
T2 the 2nd transparent protective film
A1, a2, a3 tackifier
Claims (2)
1. the manufacture method of a polarization plates is characterized in that,
Its for a face of polaroid across tackifier fit the 1st transparent protective film, make the method for rectangular polarization plates at another face across tackifier the 2nd transparent protective film of fitting,
In the 1st transparent protective film and the 2nd transparent protective film; when the size changing rate that the size changing rate of the 1st transparent protective film is made as L1, the 2nd transparent protective film was made as L2, the difference of size changing rate was that the absolute value of L1-L2 satisfies more than 0.10, wherein; the unit of size changing rate is %
And the amplitude of polaroid is below the amplitude of the 1st transparent protective film and the 2nd transparent protective film, and on the amplitude direction of polaroid, the amplitude w of the tackifier that exists laterally from the end of the both sides of polaroid satisfies 0≤w≤75, and wherein, the unit of amplitude w is mm.
2. the manufacture method of polarization plates as claimed in claim 1 is characterized in that,
The amplitude of the 1st transparent protective film is different with the amplitude of the 2nd transparent protective film.
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| Publication number | Publication date |
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| CN105487159A (en) | 2016-04-13 |
| TW201337351A (en) | 2013-09-16 |
| KR101390635B1 (en) | 2014-04-29 |
| CN103308969B (en) | 2016-01-06 |
| KR20130102451A (en) | 2013-09-17 |
| JP6045161B2 (en) | 2016-12-14 |
| TWI564599B (en) | 2017-01-01 |
| CN105487159B (en) | 2018-04-20 |
| JP2013186252A (en) | 2013-09-19 |
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