WO2015064920A1 - Adhésif comprenant une résine à base d'alcool polyvinylique pour plaque de polarisation, plaque de polarisation le comprenant et dispositif d'affichage d'image - Google Patents

Adhésif comprenant une résine à base d'alcool polyvinylique pour plaque de polarisation, plaque de polarisation le comprenant et dispositif d'affichage d'image Download PDF

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Publication number
WO2015064920A1
WO2015064920A1 PCT/KR2014/009166 KR2014009166W WO2015064920A1 WO 2015064920 A1 WO2015064920 A1 WO 2015064920A1 KR 2014009166 W KR2014009166 W KR 2014009166W WO 2015064920 A1 WO2015064920 A1 WO 2015064920A1
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Prior art keywords
polarizing plate
adhesive
polyvinyl alcohol
based resin
weight
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PCT/KR2014/009166
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English (en)
Korean (ko)
Inventor
김지영
나균일
Original Assignee
주식회사 엘지화학
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Priority claimed from KR1020140128310A external-priority patent/KR101624797B1/ko
Priority claimed from KR1020140128309A external-priority patent/KR101624796B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201480044085.1A priority Critical patent/CN105899632B/zh
Priority to US14/910,943 priority patent/US9562178B2/en
Priority to JP2016534545A priority patent/JP6154557B2/ja
Publication of WO2015064920A1 publication Critical patent/WO2015064920A1/fr

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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
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state

Definitions

  • the present invention relates to a polarizing plate adhesive for attaching a protective film or a compensation film to a polarizer and a polarizing plate using the same, and more particularly, a water-based adhesive comprising a polyvinyl alcohol-based resin, an adhesive for a polarizing plate with improved water resistance, A polarizing plate and an image display device are included.
  • the polarizing plate used in various image display devices such as a liquid crystal display device, a plasma display device, and an electroluminescent device has a structure in which a protective film is formed on at least one surface of a polarizer and a polarizer made of a polyvinyl alcohol-based film.
  • polyvinyl alcohol adhesive is mainly used as an adhesive agent for polarizing plates used for adhesion
  • the polyvinyl alcohol-based resin adhesive is a water-soluble polymer, there is a problem in that the adhesive dissolves under high humidity and the polarizer and the protective film are peeled off.
  • acetoacetyl group is added to the polyvinyl alcohol-based resin to be modified, or copolymerized with hydrophobic vinyl monomers such as ethyl acrylate, methyl acrylate, acrylic acid, and methacrylic acid, or polyvinyl alcohol-based resin.
  • hydrophobic vinyl monomers such as ethyl acrylate, methyl acrylate, acrylic acid, and methacrylic acid, or polyvinyl alcohol-based resin.
  • the water resistance tends to be somewhat improved compared to the case of using polyvinyl alcohol alone, but when applied to a high-speed production line, the water resistance and adhesion are still insufficient. There is a problem.
  • the modified polyvinyl alcohol-based resin adhesive there was a problem that staining occurs under alkaline pH conditions, and in the case of the method of mixing the crosslinking agent, there was also a problem such that the optical properties of the polarizing plate is lowered according to the amount of the crosslinking agent.
  • the present invention has been proposed to solve the above problems and to provide an adhesive for polarizing plates having excellent water resistance.
  • Yet another embodiment of the present invention is to provide a polarizing plate having excellent water resistance including the polarizing plate adhesive according to an embodiment of the present invention and an image display device including the same.
  • a polyvinyl alcohol-based resin, titanium lactate ammonium salt, hydroxy carboxylic acid and water, the pH of the polarizing plate is provided with an adhesive for 3.5 to 6.5.
  • the polyvinyl alcohol-based resin preferably includes at least one selected from the group consisting of acetacetyl-modified polyvinyl alcohol-based resins, cation-modified polyvinyl alcohol-based resins and anion-modified polyvinyl alcohol-based resins.
  • the hydroxy carboxylic acid is preferably a compound represented by the following formula (2).
  • R 1 and R 2 are each independently a C 1-5 alkyl group, an unsubstituted C 1-5 alkyl group, a hydrogen or a hydroxy group substituted with a hydroxy group or a carboxy group.
  • the hydroxy carboxylic acid preferably includes at least one selected from the group consisting of lactic acid, citric acid, glycolic acid, malic acid, tartaric acid, glycerin acid and gluconic acid.
  • the polarizing plate adhesive is 30 to 150 parts by weight of titanium lactate ammonium salt based on 100 parts by weight of polyvinyl alcohol-based resin; 1 to 13 parts by weight of hydroxy carboxylic acid; And 1000 to 10000 parts by weight of water.
  • the adhesive for the polarizing plate preferably has a weight ratio of 4: 1 to 25: 1 between the titanium lactate ammonium salt and hydroxy carboxylic acid.
  • a polarizer with a polarizer and a polymer film is provided as an adhesive for a polarizer according to an embodiment of the present invention.
  • the ratio of the peeled area to the total area is 10% or less.
  • an image display device including a polarizing plate according to an embodiment of the present invention is provided.
  • the polyvinyl alcohol-based resin, titanium lactate ammonium salt, hydroxy carboxylic acid and water, the pH of the polarizing plate adhesive having a pH of 3.5 to 6.5 has excellent water resistance.
  • the polarizing plate including the adhesive maintains the adhesive strength and optical properties between the polarizer and the polymer film even in a high humidity condition, thereby reducing the peeling phenomenon.
  • Example 1 is a photograph of the surface of the polarizing plate prepared in Example 1 after undergoing water resistance evaluation.
  • Example 2 is a photograph of the surface of the polarizing plate prepared in Example 5 after undergoing water resistance evaluation.
  • Example 3 is a photograph of the surface of the polarizing plate prepared in Example 6 after undergoing water resistance evaluation.
  • Example 4 is a photograph of the surface of the polarizing plate prepared in Example 8 after undergoing water resistance evaluation.
  • the present inventors have conducted research to develop an adhesive for polarizing plates having excellent water resistance in which optical properties and adhesive strength are stably maintained even in a high humidity environment.
  • polyvinyl alcohol-based resins, titanium lactate ammonium salts, hydroxy carboxylic acids and water are When used in combination, it was found that the adhesion and optical properties are excellent even in high temperature, high humidity environment, and completed the present invention.
  • the adhesive for polarizing plates of the present invention includes polyvinyl alcohol-based resin, titanium lactate ammonium salt, hydroxy carboxylic acid and water, and the pH is 3.5 to 6.5.
  • the polyvinyl alcohol-based resin plays a role of imparting adhesiveness
  • various polyvinyl alcohol-based resins known to be generally used as aqueous adhesives for polarizing plates may be used without limitation. It does not need to limit in particular.
  • the polyvinyl alcohol-based resin not only polyvinyl alcohol-based resin, but also modified polyvinyl alcohol-based resin may be used, and such modified polyvinyl alcohol-based resin may be, for example, aceto.
  • It may be at least one selected from an acetyl group-modified polyvinyl alcohol-based resin, a cation-modified polyvinyl alcohol-based resin and an anion-modified polyvinyl alcohol-based resin.
  • a modified polyvinyl alcohol-based resin the water resistance of the adhesive layer is improved as compared with the case of using the unmodified polyvinyl alcohol-based resin.
  • acetoacetyl group modified polyvinyl alcohol resin among the modified polyvinyl alcohol-type resin mentioned above. Since acetoacetyl group has high reactivity, when it is used for the adhesive for polarizing plates, it can show high durability by being highly crosslinked.
  • Acetoacetyl group-modified polyvinyl alcohol can be obtained by making polyvinyl alcohol-type resin and diketene react by a well-known method.
  • a polyvinyl alcohol-based resin is dispersed in a solvent such as acetic acid, and a method of adding diketene thereto, and a polyvinyl alcohol-based resin is previously dissolved in a solvent such as dimethylformamide or dioxane.
  • a solvent such as acetic acid
  • a method of adding diketene thereto and a polyvinyl alcohol-based resin is previously dissolved in a solvent such as dimethylformamide or dioxane.
  • the method of adding a diketene, the method of directly contacting a diketene gas or a liquid diketene with polyvinyl alcohol, etc. are mentioned.
  • the adhesive of the present invention may include two or more kinds of the above-described modified polyvinyl alcohol-based resins, and may include both unmodified polyvinyl alcohol-based resins and the above-described modified polyvinyl alcohol-based resins.
  • the polymerization degree of the said polyvinyl alcohol-type resin it is more preferable that it is 1000-2000. If the degree of polymerization is 500 or more, it is preferable in view of excellent durability and heat resistance. On the other hand, when the degree of polymerization is 3000 or less, the viscosity is not too high, and thus it is preferable in that the adhesive layer can be formed uniformly.
  • saponification degree (darkening degree) of the said polyvinyl alcohol-type resin, it is more preferable that it is 90-99 mol%. If saponification degree is 80 mol% or more, it is preferable at the point which is excellent in durability and heat resistance.
  • the titanium lactate ammonium salt is included in the water-based adhesive for polarizer to increase the adhesion to the polarizer, and serves to improve the water resistance of the adhesive.
  • the titanium lactate ammonium salt may form a bond with both the hydroxy group and the acetoacetyl group of the acetoacetyl group-modified polyvinyl alcohol, and thus may serve as a crosslinking agent of the polyvinyl alcohol-based resin.
  • titanium alkoxide which has been mainly used in the related art
  • when the carbon number of the ligand is low there is a problem that white precipitate occurs due to condensation reaction in an aqueous solution and thus the polymerization of the titanium oxide form occurs well.
  • solubility in water has a problem.
  • titanium lactate ammonium salt is excellent in solubility in water and can be used as a crosslinking agent of polyvinyl alcohol without the problem of precipitation in aqueous solution.
  • titanium lactate ammonium may be a compound represented by the following Chemical Formula 1.
  • the titanium lactate ammonium may be included in an amount of about 30 to 150 parts by weight, preferably about 35 to 110 parts by weight, and more preferably about 45 to 65 parts by weight based on 100 parts by weight of the polyvinyl alcohol-based resin solids.
  • titanium lactate ammonium satisfies the above range, sufficient water resistance can be expressed, and adhesion and optical properties can also be maintained.
  • the hydroxy carboxylic acid may form a structure in which the hydroxy group is bonded to the carboxyl group of the titanium lactate in the aqueous solution to increase the chain length of the lactate salt.
  • the increased chain structure helps to produce structures that increase the hydrophobicity of the lactate salts to improve water resistance and serve to increase the stability of the titanium lactate ammonium salts.
  • the hydroxy carboxylic acid is an organic compound having a hydroxy group and a carboxyl group in the molecule, but is not limited thereto, and may be a compound represented by the formula (2).
  • R 1 and R 2 are each independently a C 1-5 alkyl group substituted with a hydroxy group or a carboxy group, an unsubstituted C 1-5 alkyl group, hydrogen or a hydroxy group.
  • R 1 is a C 1-5 alkyl group, a hydrogen or hydroxy group substituted with an unsubstituted C 1-5 alkyl group, a hydroxy group, R 2 may be hydrogen.
  • the hydroxy carboxylic acid may be, but is not limited to, lactic acid, citric acid, glycolic acid, malic acid, tartaric acid, glycerin acid, gluconic acid, and the like, among which lactic acid, glycolic acid, malic acid, and the like are more preferable. Do.
  • the said hydroxy carboxylic acid can be used individually or in mixture of 2 or more types.
  • the amount of the hydroxy carboxylic acid added is about 1 to 13 parts by weight, preferably 3 to 11 parts by weight based on 100 parts by weight of the polyvinyl alcohol-based resin solid content.
  • the adhesive of the present invention comprises water.
  • water used for the said adhesive agent is not specifically limited, such as pure water, ultrapure water, and tap water, Pure water or ultrapure water is preferable from a viewpoint of maintaining the uniformity and transparency of the adhesive bond layer formed.
  • the content of water is not particularly limited, but preferably 100 to 10000 parts by weight, more preferably 1000 to 5000 parts by weight based on 100 parts by weight of the polyvinyl alcohol-based resin solids.
  • the adhesiveness tends to be easily lowered, and when it is less than 1000 parts by weight, the optical properties of the resulting polarizing plate tend to be easily lowered. .
  • the adhesive for polarizing plates of the present invention is characterized in that the pH is 3.5 to 6.5, more preferably about 4 to 6.
  • the pH of the adhesive for polarizing plates satisfies the above range, it is possible to obtain a water resistance improving effect while maintaining a bond between titanium lactate and hydroxy carboxylic acid.
  • the pH of the adhesive is basic. Titanium lactate ammonium salts can form insoluble titanium oxides by condensation reactions, which can result in precipitation and difficult bonding with hydroxy carboxylic acids.
  • the pH of the adhesive is acidic or neutral as described above, the titanium lactate ammonium salt may have a stable form in the aqueous solution, and the binding of the titanium lactate ammonium and the added hydroxy carboxylic acid may be maintained.
  • the pH of the adhesive for polarizing plate can be adjusted by adjusting the content of the titanium lactate ammonium salt and hydroxy carboxylic acid, or by adding other additives. It is not limited to this, for example. Ammonia aqueous solution (NH 4 OH), sodium hydroxide (NaOH) and potassium hydroxide (KOH) and the like may be included as additional additives.
  • the manufacturing method of the adhesive agent for polarizing plates It can manufacture by a well-known method. For example, after obtaining an aqueous solution containing a predetermined amount of polyvinyl alcohol-based resin, a method of adding an aqueous titanium lactate ammonium salt solution and hydroxy carboxylic acid to the aqueous solution, or an aqueous titanium lactate ammonium salt solution and hydroxy carboxylic acid First of all, a method of mixing and obtaining a crosslinking agent and then adding and stirring the aqueous solution containing a polyvinyl alcohol-based resin is possible.
  • the weight ratio between the titanium lactate ammonium salt and hydroxy carboxylic acid is preferably about 4: 1 to 25: 1, and more preferably about 5: 1 to 20: 1. .
  • the hydroxy group of the hydroxy carboxylic acid binds to the carboxyl group of the titanium lactate ammonium salt, making the structure of increased chain length of the lactate salt and increasing the hydrophobicity of the adhesive. Therefore, when the content of the hydroxy carboxylic acid is smaller than the above range, the hydroxy carboxylic acid and the titanium lactate ammonium salt cannot sufficiently bond, and when it exceeds the above range, the titanium lactate ammonium salt and the polyvinyl alcohol-based resin May inhibit the reaction. Therefore, when the above range is satisfied, titanium lactate ammonium salt and hydroxy carboxylic acid may be combined to stably form a structure that may contribute to water resistance improvement.
  • the said adhesive agent you may add additives, such as an adhesive, a ultraviolet absorber, antioxidant, a stabilizer, and a silane coupling agent, as needed. By adding the said additive, it can become an adhesive which has a desired performance.
  • additives such as an adhesive, a ultraviolet absorber, antioxidant, a stabilizer, and a silane coupling agent
  • Polarizing plate of the present invention is a polarizer; A polymer film attached to one side or both sides of the polarizer; And an adhesive layer for attaching the polarizer and the polymer film, wherein the adhesive layer includes polyvinyl alcohol-based resin, titanium lactate ammonium salt, hydroxy carboxylic acid and water, and has a pH of 3.5 to 6.5. It is formed by an adhesive.
  • the polarizer is not particularly limited, and a film made of polyvinyl alcohol (PVA) including a polarizer well known in the art, for example, iodine or a dichroic dye, may be used.
  • PVA polyvinyl alcohol
  • the polarizer means a state not including a protective film
  • the polarizing plate means a state in which a protective film or a compensation film is attached.
  • the polymer film may be a polarizer protective film or a compensation film for compensating optical properties of the polarizer, and a polymer film known in the art may be used.
  • the polymer film may be, for example, acrylic film, PET film, acrylic primer treated PET film, polynorbornene (PNB) film, COP film, polycarbonate film and NRT ( FUJIFILM), N TAC (KONICA), V TAC (FUJIFILM), UZ TAC (FUJIFILM), and the like.
  • cellulose films such as cellulose ester, triacetyl cellulose film (TAC film), cellulose propionate, cellulose acetate propionate, cellulose diacetate, cellulose acetate butyrate film, polycarbonate film (PC film), polystyrene Type films, polyarylate films, norbornene resin films, and polysulfone films are preferred in view of transparency, mechanical properties, and optical anisotropy.
  • TAC film triacetyl cellulose film
  • PC film polystyrene Type films
  • polyarylate films polyarylate films
  • norbornene resin films and polysulfone films
  • polysulfone films are preferred in view of transparency, mechanical properties, and optical anisotropy.
  • the triacetyl cellulose film (TAC film) and the carbonate film (PC film) are more preferable because they are easy to form and have excellent processability, and TAC films are most preferred because of polarization characteristics or durability.
  • the polymer film may be surface modified to improve adhesion and adhesion to the polarizer to which the polymer film is bonded.
  • Specific examples of the surface treatment include, but are not limited to, corona treatment, glow discharge treatment, flame treatment, acid treatment, alkali treatment, plasma treatment, ultrasonic treatment and ultraviolet irradiation treatment.
  • a method of providing an undercoat layer on the protective film in order to improve adhesion can also be used.
  • the adhesive layer is formed by the adhesive for polarizing plates of the present invention described above. Specific details of the adhesive for the polarizing plate are the same as described above, so a detailed description thereof will be omitted.
  • the thickness of the adhesive bond layer formed by the adhesive for polarizing plates of this invention as mentioned above is about 0.03-5 micrometers, Preferably it is about 0.03-1 micrometer. If the thickness of the adhesive layer is less than 0.03 ⁇ m, the uniformity and adhesive strength of the adhesive layer may be lowered, and if the thickness of the adhesive layer exceeds 5 ⁇ m may cause problems such as cost increase and the appearance of the polarizing plate wrinkles .
  • the polarizing plate according to the present invention can be manufactured using a polarizing plate manufacturing method known in the art.
  • the adhesive of the present invention is applied to at least one side of a polarizer or a polarizer protective film or a compensation film, the polymer film is laminated on one or both sides of the polarizer, and then the adhesive is cured through heat treatment. It may be prepared by a method to make, but is not limited thereto. At this time, the heat treatment conditions may be appropriately adjusted according to the desired adhesive properties.
  • the polarizing plate manufactured by bonding the polarizer and the polymer film by using the adhesive according to one embodiment of the present invention has excellent water resistance, such as the adhesion between the polarizer and the polymer film and the optical properties of the polarizing plate are maintained even under high humidity due to the adhesive. .
  • the peeled area ratio to the total area is 10% or less, preferably 5% or less.
  • the area ratio peeled off under the above conditions is more than 10%, problems of deterioration of durability and optical properties of the polarizing plate and deterioration of commercial properties occur, thereby making it difficult to commercialize.
  • the polarizer of the present invention has a peeling area ratio of 10% or less, it can be seen that water resistance is very excellent.
  • the polarizing plate using the adhesive for polarizing plate of the present invention has excellent optical properties.
  • the polarizing plate according to the present invention preferably has a unit transmittance (Ts) of about 41% to 45% and a polarization degree of 99.90% or more, and more preferably, a group transmittance of about 42% to 44% and 99.95% or more. It is preferable to have a degree of polarization.
  • Ts unit transmittance
  • a single color a value of -3 to -1, a single color b value of 3.0 to 5.5, a cross color a value of 0.1 to 0.6 and a cross color b value of -1.5 to It is preferably 0.5, but is not limited thereto.
  • the group color used herein refers to a color obtained when natural light is irradiated to one polarizing plate
  • the orthogonal color refers to two polarizing plates having different polarizing plates stacked on one polarizing plate so that absorption axes are perpendicular to each other at right angles. The color obtained when irradiated.
  • the group colors a and b values refer to the color a and b values in the CIE coordinate system measured by using a colorimeter with a single polarizer color
  • the orthogonal colors a and b values indicate that a pair of polarizers are orthogonal to the absorption axis.
  • the color range represents a range that can be selectively mass produced according to a specification desired by the customer.
  • the polarizing plate of the present invention as described above may be usefully applied to an image display device such as a liquid crystal display device.
  • the image display device may be, for example, a liquid crystal display device including a liquid crystal panel and polarizing plates provided on both surfaces of the liquid crystal panel, wherein at least one of the polarizing plates may be a polarizing plate according to the present invention.
  • the type of liquid crystal panel included in the liquid crystal display device is not particularly limited.
  • a panel of a passive matrix type such as, but not limited to, a twisted nematic (TN) type, a super twisted nematic (STN) type, a ferrolectic (F) type, or a polymer dispersed (PD) type; Active matrix panels such as two-terminal or three-terminal; All known panels, such as an In Plane Switching (IPS) panel and a Vertical Alignment (VA) panel, can be applied.
  • IPS In Plane Switching
  • VA Vertical Alignment
  • other configurations constituting the liquid crystal display device for example, types of upper and lower substrates (eg, color filter substrates or array substrates) are not particularly limited, and configurations known in the art may be employed without limitation. Can be.
  • Acetoacetyl group-modified polyvinyl alcohol (average degree of polymerization 1100, saponification degree 99%) was dissolved in pure water at 80 ° C to prepare an aqueous solution (250 g) of 4% by weight.
  • aqueous solution 250 g
  • a crosslinker was prepared. Thereafter, the modified polyvinyl alcohol aqueous solution and the prepared crosslinking agent were mixed, followed by adding pure water to prepare an adhesive having a pH of 4.4.
  • Aqueous ammonia (NH 4 OH, 25%) was added to the adhesive prepared in Preparation Example 7 to prepare an adhesive having a pH of 5.0.
  • Aqueous ammonia (NH 4 OH, 25%) was added to the adhesive prepared in Preparation Example 7 to prepare an adhesive having a pH of 6.0.
  • acetoacetyl group-modified polyvinyl alcohol (average degree of polymerization 1100, saponification degree 99%) in pure water at 80 ° C. to prepare an aqueous solution (250 g) of 4% by weight, based on 100 parts by weight of the polyvinyl alcohol-based resin solids, 10 parts by weight (10 g) of sodium glyoxylate (10% aqueous solution) was added to prepare an adhesive having a pH of 5.7.
  • acetoacetyl group-modified polyvinyl alcohol (average degree of polymerization 1100, saponification degree 99%) in pure water at 80 ° C. to prepare an aqueous solution (250 g) of 4% by weight, based on 100 parts by weight of the polyvinyl alcohol-based resin solids.
  • An adhesive was prepared by adding 58 parts by weight (5.8 g) of tetra isopropyl titanate and 8.8 parts by weight (0.88 g) of lactic acid.
  • Aqueous ammonia (NH 4 OH, 25%) was added to the adhesive prepared in Preparation Example 7 to prepare an adhesive having a pH of 7.0.
  • the polyvinyl alcohol film having a thickness of 60 ⁇ m was immersed in a dye solution of iodine and potassium iodide while dyed by using a guide roll, and then stretched for about 3 to 6 times. Subsequently, the film was introduced into a bath of boric acid and potassium iodide, crosslinked, and dried at 80 ° C. for 5 to 8 minutes to obtain a polarizing film.
  • a saponified triacetylcellulose (TAC) film having a thickness of 60 ⁇ m was bonded to both surfaces of the polyvinyl alcohol polarizing film prepared by (1) using the adhesive prepared in Preparation Example 1, and laminated as a protective film. Then, it dried for 5 minutes in an 80 degreeC oven, and manufactured the polarizing plate.
  • TAC triacetylcellulose
  • a polarizing plate was manufactured in the same manner as in Example 1 except that the adhesive prepared in Preparation Examples 2 to 12 was used as the adhesive.
  • a polarizing plate was manufactured in the same manner as in Example 1 except that the adhesive prepared in Preparation Examples 13 to 18 was used as the adhesive.
  • the polarizing plates produced by Examples 1 to 12 and Comparative Examples 1 to 6 were cut to a size of 50 mm x 80 mm. At this time, the extending direction of the polarizing film was made into the long axis, and the direction orthogonal to it was made into the short axis. After the polarizing plate was laminated on the glass through the applied pressure-sensitive adhesive to prepare a specimen, water resistance was evaluated.
  • the water resistance was evaluated by measuring the degree of peeling when left for 24 hours at 60 ° C. temperature and 100% relative humidity (using a thermostat).
  • the peeling degree confirmed the presence or absence of the area
  • Physical property evaluation results of the polarizing plates of Examples and Comparative Examples are shown in Table 2 below.
  • the polarizing plates prepared in Examples 1 to 12 and Comparative Examples 1 to 6 were cut to a size of 40 mm ⁇ 40 mm, and the specimen was fixed to a measuring holder, followed by an ultraviolet visible spectrometer (V-7100, manufactured by JASCO Corporation). ), The single transmittance (Ts), the polarization degree, and the color (group a, group b, orthogonal a, orthogonal b) were measured, and the results are shown in Table 2.
  • the single transmittance (Ts) and the single color (a, b) are measured values for one polarizing plate, and the orthogonal color (orthogonal a, orthogonal b) is orthogonal to each other so that the absorption axis of the two polarizing plates is 90 °. After measurement, it is shown in Table 2.
  • the polarization degree is defined by the following equation (1) by the parallel transmittance (Tp) obtained when two polarizing plates are arranged in parallel with the absorption axis and the orthogonal transmittance (Tc) obtained after orthogonal to each other such that the absorption axis is 90 °.
  • the adhesive for a polarizing plate according to the present invention was confirmed to exhibit all excellent properties in terms of water resistance to water compared to Comparative Examples 1 to 3.
  • Comparative Example 4 using titanium alkoxide solid precipitation occurred, which made it difficult to use as an adhesive.
  • pH of the adhesive for the polarizing plate deviated from 3.5 to 6.5, as can be seen in Comparative Examples 5 and 6, it was found that the water resistance is poor.
  • the polarizing plate manufactured according to the example could hardly confirm the peeling phenomenon and the discoloration phenomenon of iodine in the polarizer after water resistance evaluation.
  • the phenomenon of discoloration of iodine can be confirmed in most regions of the polarizing plate.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

La présente invention concerne un adhésif comprenant une résine à base d'alcool polyvinylique destiné à une plaque de polarisation, et ayant une valeur de pH comprise entre 3,5 et 6,5 et conservant une meilleure résistance adhésive et une meilleure résistance à l'eau, l'adhésif contenant une résine à base d'alcool polyvinylique, un sel d'ammonium de lactate de titane, un acide hydroxycarboxylique et de l'eau ; l'invention concernant également une plaque de polarisation le comprenant et un dispositif d'affichage d'image.
PCT/KR2014/009166 2013-10-31 2014-09-30 Adhésif comprenant une résine à base d'alcool polyvinylique pour plaque de polarisation, plaque de polarisation le comprenant et dispositif d'affichage d'image WO2015064920A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201480044085.1A CN105899632B (zh) 2013-10-31 2014-09-30 用于偏光板的基于聚乙烯醇的树脂粘合剂，包含该粘合剂的偏光板，以及图像显示设备
US14/910,943 US9562178B2 (en) 2013-10-31 2014-09-30 Polyvinylalcohol based resin adhesive for polarizing plate, polarizing plate including same, and an image display device
JP2016534545A JP6154557B2 (ja) 2013-10-31 2014-09-30 偏光板用ポリビニルアルコール系樹脂接着剤、これを含む偏光板および画像表示装置

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KR10-2013-0131797 2013-10-31
KR20130131799 2013-10-31
KR20130131797 2013-10-31
KR10-2013-0131799 2013-10-31
KR1020140128310A KR101624797B1 (ko) 2013-10-31 2014-09-25 편광판용 폴리비닐알코올계 수지 접착제, 이를 포함하는 편광판 및 화상표시장치
KR10-2014-0128310 2014-09-25
KR10-2014-0128309 2014-09-25
KR1020140128309A KR101624796B1 (ko) 2013-10-31 2014-09-25 편광판용 폴리비닐알코올계 수지 접착제, 이를 포함하는 편광판 및 화상표시장치

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2016035822A1 (ja) * 2014-09-03 2017-06-29 住友化学株式会社 接着剤組成物及びこれを用いて製造される偏光板

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JPH10130609A (ja) * 1996-10-31 1998-05-19 Premark Rwp Holdings Inc メラミン処理紙をパーティクルボードに結合するための接着剤
JP2006276574A (ja) * 2005-03-30 2006-10-12 Nitto Denko Corp 偏光子保護フィルム、偏光板、および画像表示装置
JP2008115352A (ja) * 2006-10-12 2008-05-22 Sumitomo Forestry Co Ltd 高耐水性樹脂層形成剤
KR20090020641A (ko) * 2006-05-26 2009-02-26 스미또모 가가꾸 가부시끼가이샤 점착제가 형성된 편광 필름, 광학 적층체 및 편광 필름의 세트
JP2012177890A (ja) * 2010-11-29 2012-09-13 Sumitomo Chemical Co Ltd 偏光板の製造方法

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JPH10130609A (ja) * 1996-10-31 1998-05-19 Premark Rwp Holdings Inc メラミン処理紙をパーティクルボードに結合するための接着剤
JP2006276574A (ja) * 2005-03-30 2006-10-12 Nitto Denko Corp 偏光子保護フィルム、偏光板、および画像表示装置
KR20090020641A (ko) * 2006-05-26 2009-02-26 스미또모 가가꾸 가부시끼가이샤 점착제가 형성된 편광 필름, 광학 적층체 및 편광 필름의 세트
JP2008115352A (ja) * 2006-10-12 2008-05-22 Sumitomo Forestry Co Ltd 高耐水性樹脂層形成剤
JP2012177890A (ja) * 2010-11-29 2012-09-13 Sumitomo Chemical Co Ltd 偏光板の製造方法

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JPWO2016035822A1 (ja) * 2014-09-03 2017-06-29 住友化学株式会社 接着剤組成物及びこれを用いて製造される偏光板

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