KR101780533B1 - Composition of protective layer for polarizing plate, protective layer prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same - Google Patents

Composition of protective layer for polarizing plate, protective layer prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same Download PDF

Info

Publication number
KR101780533B1
KR101780533B1 KR1020140169209A KR20140169209A KR101780533B1 KR 101780533 B1 KR101780533 B1 KR 101780533B1 KR 1020140169209 A KR1020140169209 A KR 1020140169209A KR 20140169209 A KR20140169209 A KR 20140169209A KR 101780533 B1 KR101780533 B1 KR 101780533B1
Authority
KR
South Korea
Prior art keywords
polarizer
protective layer
polarizing plate
acrylate
composition
Prior art date
Application number
KR1020140169209A
Other languages
Korean (ko)
Other versions
KR20160065409A (en
Inventor
유미연
김현영
이도헌
이태현
한인천
Original Assignee
삼성에스디아이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Priority to KR1020140169209A priority Critical patent/KR101780533B1/en
Priority to PCT/KR2015/006035 priority patent/WO2016085072A1/en
Priority to TW104130515A priority patent/TWI573835B/en
Publication of KR20160065409A publication Critical patent/KR20160065409A/en
Application granted granted Critical
Publication of KR101780533B1 publication Critical patent/KR101780533B1/en

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Abstract

The present invention relates to a composition comprising (A) a polyester (meth) acrylate, (B) a hydroxyl group-containing (meth) acrylate and (C) an isocyanurate compound, Tg) of 50 占 폚 or higher.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizer protective layer composition, a polarizer protective layer made therefrom, a polarizing plate including the polarizer protective layer, and an optical display device including the polarizer protective layer. 2. Description of the Related Art THE SAME}

The present invention relates to a polarizer protective layer composition, a polarizer protective layer made therefrom, a polarizing plate comprising the same, and an optical display device comprising the polarizer protective layer composition.

In a liquid crystal display device, an image is formed by arranging a polarizing plate on both sides of a glass substrate that forms the surface of a liquid crystal panel. The polarizing plate is generally formed of a transparent protective film for a polarizer using triacetyl cellulose (TAC) or the like on one side or both sides of a polarizer made of a polyvinyl alcohol (PVA) film and a dichroic material such as iodine or the like as a polyvinyl alcohol- Are used.

In recent years, a polarizing plate including a transparent protective film is used for only one side of a polarizer for thinning purposes. Further, the use environment of devices including the polarizing plate is diversified, and durability under a harsh environment at low temperature and high temperature is required.

However, the thin, sticky polarizer provided with a transparent protective film on only one side of the polarizer has poor durability, and cracks tend to occur in the stretching direction (MD direction) of the polarizer under such a severe environment. Particularly, generation of the cracks is likely to occur when the size of the polarizing plate is increased.

Accordingly, a polarizing plate having a protective layer or a protective layer formed on at least one side of a polarizer has been proposed in order to solve the above-mentioned problems caused by thinning.

In this regard, the background art of the present invention is disclosed in Japanese Laid-Open Patent Publication No. 2006-220732.

An object of the present invention is to provide a polarizer protective layer composition which is excellent in water resistance and can prevent cracks in the plane of the polarizer under a thermal shock condition, a polarizer protective layer made therefrom, a polarizing plate comprising the same, and an optical display device .

Another object of the present invention is to provide a polarizer protective layer composition excellent in adhesion and cuttability, a polarizer protective layer made therefrom, a polarizing plate comprising the polarizer protective layer, and an optical display device including the same.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the present invention relates to a polarizer protective layer composition.

According to one embodiment, the polarizer protective layer composition is a composition comprising (A) a polyester (meth) acrylate, (B) a (meth) acrylate having a hydroxyl group and (C) an isocyanurate compound , And the composition has a glass transition temperature (Tg) of 50 DEG C or more after curing.

(A) 25 to 80% by weight of a polyester (meth) acrylate, 5 to 60% by weight of a (meth) acrylate having a hydroxyl group and 5 to 30% by weight of an isocyanurate compound (C) . ≪ / RTI >

According to another embodiment, the composition comprises 0.1 to 10 parts by weight of a photosensitizer (D) and 0.1 to 10 parts by weight of a photo radical polymerization initiator (D), based on 100 parts by weight of the total of the components (A), (B) By weight of the composition.

Another aspect of the invention relates to a polarizer protective layer.

According to one embodiment, the polarizer protective layer may be formed of a composition for the polarizer protective layer.

The protective layer may have a modulus at 25 DEG C of from 1,000 MPa to 2,500 MPa.

According to another embodiment, the modulus of the protective layer may be greater than 2,000 MPa and less than 2,500 MPa at 25 ° C.

The protective layer may have a thickness of 1 占 퐉 to 10 占 퐉.

Another aspect of the present invention relates to a polarizing plate.

According to one embodiment, the polarizing plate may include a polarizer and any one of the polarizer protective layers formed on one side or both sides of the polarizer.

According to another embodiment, the polarizing plate may include the polarizer protective layer on one surface of the polarizer, and may include an optical film formed on the back surface of the polarizer.

Another aspect of the present invention relates to an optical display device.

According to one embodiment, the optical display device may include the polarizer.

The present invention relates to a polarizer protective layer composition which is excellent in water resistance and can prevent cracks in a plane of a polarizer under a thermal shock condition and is excellent in adhesion and cuttability, a polarizer protective layer made therefrom, a polarizing plate comprising the polarizer protective layer, And has an effect of providing a device.

1 is a cross-sectional view of a polarizing plate according to one embodiment of the present invention.
2 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.
3 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.
4 is a cross-sectional view of an optical display device according to one embodiment of the present invention.

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification. In the present specification, 'upper' and 'lower' are defined with reference to the drawings, and 'upper' and 'lower' and 'lower' Rate " may mean acrylate and / or methacrylate. As used herein, the term " compound " may include monomers, oligomers, resins, and the like.

In the present specification, 'modulus' means that the polarizer protective layer composition is applied to a release film (for example, a polyethylene terephthalate film) in a thickness of 50 μm and cured at an illuminance of 400 mw / cm 2 and a light quantity of 1,000 mJ / , The prepared adhesive film was cut into a width x length (10 mm x 100 mm) and the specimen was fixed to DMA (Q800, TA Instruments). In the analysis mode, tension film, 25 μm in amplitude, 0.5 N, a heating rate of 10 ° C / min, a temperature range of -50 ° C to 100 ° C, a frequency of 1 Hz and a strain of 0.5%, and the value at 25 ° C was obtained by storage modulus.

Hereinafter, the present invention will be described in detail.

The polarizer protective layer composition of the present invention is a composition comprising (A) a polyester (meth) acrylate, (B) a (meth) acrylate having a hydroxyl group and (C) an isocyanurate compound, The glass transition temperature (Tg) is 50 占 폚 or higher.

The glass transition temperature (Tg) after curing of the protective layer composition is 50 占 폚 or higher, specifically 57 占 폚 or higher, more specifically 65 占 폚 or higher, thereby improving water resistance and preventing in-plane cracking of the polarizer under thermal shock.

Hereinafter, the protective layer composition will be described.

 (A) a polyester (meth) acrylate

The polyester (meth) acrylate (A) may be prepared from (meth) acrylic acid, polycarboxylic acids and polyols in several steps or in one step.

The polyester-based (meth) acrylate oligomer is produced, for example, by preparing a polyester oligomer having hydroxyl groups at both terminals by condensation of a polyvalent carboxylic acid and a polyhydric alcohol, esterifying the hydroxyl group of the polyester oligomer with (meth) . In another embodiment, an alkylene oxide is added to the polyvalent carboxylic acid to prepare an oligomer, and the terminal hydroxyl group of the oligomer is esterified with (meth) acrylic acid.

Specifically, the polychester (meth) acrylate (A) may be a monofunctional or polyfunctional polyester (meth) acrylate. For example, it is possible to use tetrafunctional polyester acrylate (PS-420, manufactured by Mi-won), polyester acrylate oligomer (CN2303, SARTOMER) It is not.

The polyester (meth) acrylate (A) may be contained in the polarizer protective layer composition in an amount of 25 to 80% by weight, preferably 30 to 70% by weight, more preferably 40 to 60% by weight. The curing rate of the radical polymerization by the light energy is increased in the above range, and the reactivity is excellent.

(B) a (meth) acrylate having a hydroxyl group

Since the hydroxyl group of the (meth) acrylate (B) having a hydroxyl group and contained in the polarizer protective layer composition has good compatibility with the polyvinyl alcohol (PVA) element, the polyvinyl alcohol (PVA) film and the dichroic And improves the adhesion to a polarizer made of a material.

The (meth) acrylate (B) having a hydroxyl group is preferably an alkyl group having 1 to 10 carbon atoms having at least one hydroxyl group, preferably a (meth) acrylate having an alkyl group having 1 to 5 carbon atoms having at least one hydroxyl group, (Meth) acrylate having an alicyclic group having 3 to 10 carbon atoms and having at least one hydroxyl group. For example, the monofunctional (meth) acrylate having at least one hydroxyl group may be selected from the group consisting of 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) (Meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, 1-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (Meth) acrylate, 4-hydroxycyclopentyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, -Hydroxycyclohexyl (meth) acrylate, and the like. These may be included singly or in combination of two or more.

The (meth) acrylate (B) having a hydroxyl group may be contained in the polarizer protective layer composition in an amount of 5 to 60% by weight, preferably 15 to 55% by weight, more preferably 25 to 45% by weight. In the above range, adhesion with a polarizer and cutability are excellent.

(C) an isocyanurate compound

The polarizer protective layer composition includes (C) an isocyanurate compound represented by the following formula (1).

[Chemical Formula 1]

Figure 112014116183111-pat00001

(Wherein R 1 , R 2 and R 3 are each independently a C 1-10 alkylene group, and Y 1 , Y 2 and Y 3 are each independently a hydroxyl group or a (meth) acrylate group.)

R 1 , R 2 and R 3 are preferably C 1-5 alkylene groups.

The isocyanurate compound (C) is added to a compound of a polyester (meth) acrylate (A) and a (meth) acrylate (B) having a hydroxyl group to improve the mechanical strength and heat resistance, The glass transition temperature (Tg) of the protective layer is increased to improve the crack resistance of the polarizer under the thermal shock condition.

(C) the isocyanurate compound may be contained in the polarizer protective layer composition in an amount of 5 to 30% by weight, preferably 9 to 25% by weight. In this range, it is easy to form a thin film, has excellent mechanical strength and heat resistance, can increase the glass transition temperature (Tg) of the polarizer protective layer, and can improve the crack resistance of the polarizer under the thermal shock condition.

In embodiments, the protective layer formed from the composition may have a modulus of from 1,000 MPa to 2,500 MPa. Since the modulus of the protective layer is 1,000 MPa or more, the protective layer has excellent water resistance and can prevent cracks in the plane of the polarizer under a thermal shock condition. Further, the modulus is less than 2,500 MPa, and the effect of cutting is excellent.

In another embodiment, the protective layer formed from the composition may have a modulus of greater than 2,000 MPa and no greater than 2,500 MPa. The protective layer has a modulus of more than 2,000 MPa, which is excellent in water resistance, can prevent cracks in the plane of the polarizer under a thermal shock condition, has an excellent barrier property, and is also excellent in water resistance and heat stability. Also, the modulus is less than 2,500 MPa, and the cutting property is excellent.

According to an embodiment, the polarizer protective layer composition may further include at least one of (D) 0.1 to 10 parts by weight of a photosensitizer and (E) 0.1 to 10 parts by weight of a photo radical polymerization initiator, relative to 100 parts by weight of the protective layer composition have.

(D) Photosensitizer

The photosensitizer (D) generates a small amount of radicals to catalyze the curing reaction. The photosensitizer (D) can improve the reactivity of the photo radical polymerization initiator by serving to catalyze the initiation reaction of the photo radical polymerization initiator for curing the (meth) acrylate compound.

The photosensitizer (D) may include phosphorus, triazine, acetophenone, benzophenone, thioxanthone, benzoin, oxime or mixtures thereof. In embodiments, it may include a thioxantanone or a mixture thereof, a thioxanthene photosensitizer.

The photosensitizer (D) may be included in an amount of 0.1 to 10 parts by weight, preferably 0.5 to 3 parts by weight based on 100 parts by weight of the total of (A), (B) and (C). Within this range, the (meth) acrylate-based compound is sufficiently cured under the light amount of the process, and the effect of improving the reactivity of the photo radical polymerization initiator is improved.

(E) Photo radical polymerization initiator

The photoradical polymerization initiator (E) is a catalyst which generates radicals by light irradiation to catalyze curing. The photoradical polymerization initiator (E) may include a conventional photoradical polymerization initiator. Specifically, the photo radical polymerization initiator (E) may include at least one of phosphorus, triazine, acetophenone, benzophenone, thioxanthone, benzoin, and oxime.

The photo radical polymerization initiator (E) may be contained in an amount of 0.1 to 10 parts by weight, preferably 0.1 to 3 parts by weight based on 100 parts by weight of the total of (A), (B) and (C). Within the above range, polymerization of the (meth) acrylate-based compound can be sufficiently carried out, and remaining amount of the initiator can be prevented from remaining.

Hereinafter, a protective layer, a polarizing plate, and an optical display device according to embodiments of the present invention will be described with reference to the drawings.

Polarizer

The polarizer protective layer composition may be coated on one side or both sides of the polarizer 110 to form the protective layers 130, 131 and 132.

In one embodiment, the polarizer 100 may form a protective layer 130 on one side of the polarizer 110. 1 is a cross-sectional view of a polarizing plate 100 according to one embodiment of the present invention.

The polarizer 110 polarizes natural or artificial light so that a screen is displayed on a display device. The polarizer 110 may be mainly made of a polyvinyl alcohol (PVA) film. For example, the polarizer 110 may be formed by dyeing a modified polyvinyl alcohol film such as a partially-formalized polyvinyl alcohol film or an acetoacetyl-modified polyvinyl alcohol film with iodine or a dichroic dye, stretching it in an MD (machine direction) . Specifically, it is produced through a swelling process, a dyeing process, and a stretching process. Methods of performing each step are commonly known to those skilled in the art.

The polarizer 110 may have a thickness of 5 占 퐉 to 50 占 퐉 and may be used in an optical display device in the above range.

The protective layer 130 may be formed by coating the polarizer protective layer composition on one side of the polarizer 110 and curing the polarizer protective layer composition. Specifically, it can be formed by curing at an illuminance of 100 to 1,000 mW / cm 2 and a light quantity of 100 to 1,000 mJ / cm 2 .

The protective layer 130 protects the polarizer 110 from an adhesive film or the like for a polarizing plate and can prevent a crack from occurring in the polarizer 110 even under a thermal shock. In addition, the protective layer 130 may have an adhesive force to the polarizer 110 to realize a thinning effect of the polarizer 100, and conventional optical films require additional processing such as corona treatment to adhere to the polarizer , The protective layer 130 can adhere well to the polarizer 110 without such additional processing.

In an embodiment, the protective layer 130 may have a modulus of from 1,000 MPa to 2,500 MPa. The protective layer 130 has a modulus of 1,000 MPa or more and is excellent in water resistance and has an effect of preventing an in-plane crack of the polarizer 110 under a thermal shock condition. Also, the modulus is less than 2,500 MPa, and it is excellent in cutting property and water resistance.

In other embodiments, the protective layer 130 may have a modulus of greater than 2,000 MPa and no greater than 2,500 MPa. Since the modulus of the protective layer 130 is more than 2,000 MPa, the protective layer 130 is excellent in water resistance, has an effect of preventing cracks in the surface of the polarizer 110 under a thermal shock condition, and is excellent in barrier property and excellent in water resistance and heat stability It is effective. Also, the modulus is less than 2,500 MPa, and it is excellent in cutting property and water resistance.

The protective layer 130 may have a glass transition temperature (Tg) of 50 ° C or more, specifically 57 ° C or more, more specifically 65 ° C or more as described in the protective layer composition. With the increase of the water resistance in the above-mentioned range, there is an effect of preventing the in-plane cracking of the polarizer 110 under the thermal shock condition.

Since the protective layer 130 has a thickness in a predetermined range, the strength of the polarizing plate 100, which may have a low mechanical strength, can be compensated and a thinning effect can be realized. Specifically, the protective layer 130 may have a thickness of 1 占 퐉 to 10 占 퐉, for example, 2 占 퐉 to 5 占 퐉, the polarizing plate 100 may be used in the above range, Can be supplemented.

In another embodiment, the polarizing plate 101 may include a polarizer 110 and protective layers 131 and 132 formed on both sides of the polarizer 110. 2 is a cross-sectional view of a polarizing plate 101 according to another embodiment of the present invention. The protective layers 131 and 132 may be formed on both sides of the polarizer 110 in order to improve the mechanical strength or to prevent the cracks.

In another embodiment, the polarizing plate 102 may include a polarizer 110, an optical film 120 formed on one surface of the polarizer 110, and a protective layer 130 formed on the back surface of the polarizer 110. 3 is a cross-sectional view of a polarizing plate 102 according to another embodiment of the present invention.

Since the polarizer 110 is manufactured by uniaxially stretching a polyvinyl alcohol (PVA) film in a machine direction (MD) in a stretching direction, when the film is left in a harsh environment including a thermal shock, shrinkage occurs in the MD (machine direction) do. When the polarizing plate 102 having the optical film 120 formed on only one side of the polarizer 110 is left in a harsh environment including a thermal shock, the polarizer 110 is contracted only on one side of the polarizer 110, There can be more cracks in the machine direction (MD). Of course, the optical film 120 and the adhesive layer may be further formed on the other surface of the polarizer 110. However, formation of the adhesive layer with the optical film 120 has a limitation in preventing the occurrence of cracks. The thickness of the polarizing plate 102 can be increased.

On the other hand, in the polarizing plate 102 of the present invention, the optical film 120 is formed on one side of the polarizer 110 and a protective layer 130 having a modulus of more than 1,000 MPa is further formed on the other side of the polarizer 110 It is possible to prevent a crack from occurring in the polarizer 110 even in a severe environment caused by thermal shock. Specifically, the modulus of the protective layer 130 may be more than 1,000 MPa and not more than 2,500 MPa. In this range, cracking of the polarizer 110 is prevented in a harsh environment and the durability is improved.

The polarizing plate 102 according to another embodiment of the present invention may be manufactured by forming the optical film 120 on one surface of the polarizer 110 and further forming a protective layer 130 having a modulus of 2,000 MPa or more and 2,500 MPa or less on the other surface of the polarizer 110 It is possible not only to prevent cracking of the polarizer 110 even in a severe environment caused by thermal shock, but also to exhibit excellent barrier properties and excellent water resistance and heat stability.

As a result, the polarizing plate 102 has a maximum length of a crack generated in the MD at the end portion of the polarizer 110 when left at high temperature and / or high humidity is 500 탆 or less, for example, 200 탆 to 500 탆, 400 mu m. The thermal shock refers to 100 cycles when the temperature is raised from -40 ° C to 85 ° C, the temperature is kept at -40 ° C for 30 minutes, the temperature is raised to 85 ° C, and then left at 85 ° C for 30 minutes.

The optical film 120 is formed on one surface of the polarizer 110 to protect the polarizer 110 and may include an optically transparent normal film. For example, it is possible to use a polyester type, a polycarbonate type, a polycarbonate type, a polyethylene terephthalate (PET) or the like including a cyclic polyolefin type including a cyclic olefin polymer (COP) Polyether sulfone type, polysulfone type, polyamide type, polyimide type, polyolefin type, polyacrylate type, polyvinyl alcohol type, polyvinyl chloride type, polyvinyl chloride type Lt; RTI ID = 0.0 > and / or < / RTI >

The thickness of the optical film 120 may be 10 占 퐉 to 200 占 퐉, for example, 30 占 퐉 to 120 占 퐉, and the optical film 120 may be used in an optical display device in the above range.

Although not shown in FIG. 3, a functional coating layer may be further formed on the upper surface of the optical film 120 to provide an additional function to the polarizing plate 102, for example, a hard coating layer, a translucent layer, .

Optical display device

The optical display device 200 of the present invention may include the polarizing plates 100, 101, and 102 of the present invention. The optical display device 200 is an ordinary optical display device 200 including the polarizing plates 100, 101, and 102, and may include, for example, a liquid crystal display device.

Hereinafter, an optical display device 200 according to a specific embodiment of the present invention will be described with reference to FIG. 4 is a cross-sectional view of an optical display device 200 according to an embodiment of the present invention.

4, an optical display device 200 according to an embodiment of the present invention includes a liquid crystal display panel 210, a first polarizer 220 formed on one side of the liquid crystal display panel 210, And a second polarizing plate 230 formed between the liquid crystal display panel 210 and the light source 240. One or more of the first polarizing plate 220 and the second polarizing plate 230 may be a polarizing plate 100, 101, 102).

Example

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Specific specifications of the components used in the following examples and comparative examples are as follows.

A. Polyester (meth) acrylate

(A1) Tetrafunctional polyester acrylate (PS-420, MIW)

(A2) Polyester acrylate oligomer (CN2303, SARTOMER)

B. (Meth) acrylate having a hydroxyl group

(B) 2-Hydroxyethyl acrylate (Sigma-Aldrich)

C. isocyanurate compound

(C1) THEICDA, Tris (2-hydroxyethyl) isocyanurate diacrylate (M-2370,

(C2) Tris (2-hydroxyethyl) isocyanurate triacrylate (SR368NS, SARTOMER)

E. Photo radical polymerization initiator

(E) 2,4,6-Trimethylbenzoyl-diphenyl-phosphineoxide (Darocure TPO, Ciba)

Examples 1 to 8 and Comparative Examples 1 to 6

Components A, B, and C were blended in the amounts shown in Table 1 below, and 2 parts by weight (relative to 100 parts by weight of total A, B and C) of photo radical polymerization initiator (E) were blended therein, Layer composition.

Figure 112014116183111-pat00002

(The unit in Table 1 is% by weight)

Production of Polarizer

A polyvinyl alcohol film (degree of saponification: 99.5, degree of polymerization: 2,000) having a thickness of 80 mu m was immersed in a 0.3% iodine aqueous solution and was subjected to MD stretching at a stretching ratio of 5.0. Subsequently, the stretched polyvinyl alcohol film was immersed in a boric acid solution of 3% concentration and an aqueous solution of 2% potassium iodide to perform color correction, and then dried at 50 DEG C for 4 minutes to prepare a polarizer (thickness 25 mu m). Triacetate cellulose (TAC) having a thickness of 40 mu m was saponified to be used as an optical film

An adhesive was applied to one surface of the polarizer at a temperature of 22 ° C to 25 ° C and a relative humidity of 20% to 60%, and an optical film was laminated. At this time, an aqueous polyvinyl alcohol adhesive (a mixture of 100 parts by weight of water, 5 parts by weight of polyvinyl alcohol, 0.5 parts by weight of polyethyleneimine and 0.5 parts by weight of zirconium oxide) was used as the adhesive. The composition for protective layer prepared in Examples and Comparative Examples was applied to the other surface of the polarizer and irradiated with ultraviolet rays under conditions of 400 mW / cm2 and 1,000 mJ / cm2 with a metal halide lamp. The protective layer was again coated with a pressure-sensitive adhesive (CI-205 manufactured by Soken Co.) to prepare a polarizing plate.

The compositions for the protective layer of the examples and comparative examples, and the polarizing plate prepared using the same, were evaluated for physical properties as shown in Table 2 below.

Figure 112014116183111-pat00003

As shown in Table 2, in the polarizing plate of the present invention, when a polarizing plate was left in a thermal shock, no crack occurred on the entire surface of the polarizer, and a crack was formed on the end of the polarizing plate. In addition, adhesion and cuttability to the polarizer are good, and it is not necessary to further form an adhesive layer between the polarizer and the protective layer.

On the other hand, when the isocyanurate compound is not contained in the polarizer protective layer composition or the content is out of the range of the present invention, there is a problem in adhesiveness, cuttability and water resistance, and cracks are generated in the end portion of the polarizer Respectively.

How to measure property

1) Adhesiveness: In order to confirm the adhesion between the polarizer and the protective layer, a cutter edge was inserted between the protective layer at the end and the polarizer. A that the tip of the sword did not enter between the protective layer and the polarizer; A that the tip of the sword was slightly inclined; A that the tip of the sword was slightly inclined, but the protective layer was torn during the constant strength;

2) Cutting property: The polarizing plate produced in order to confirm the cuttability of the polarizing plate was cut in width x length (500 mm x 500 mm) and punched out from the side of the protective layer using a cutter blade. The peeled state of the end portions of the four faces of the punched polarizing plate was visually observed. A peeled layer having a thickness of more than 1 mm and a peeled thickness of 2 mm or more was peeled.

3) Water Resistance: A polarizing plate produced in order to confirm the water resistance of the polarizing plate was punched into a width x length (500 mm x 500 mm), punched and immersed in constant temperature water (60 DEG C) for 2 hours, And the discoloration state of the polarizer was visually observed. Peeled and discolored were evaluated as?, And peeled and discolored as X in addition to those peeled off by 2 mm.

4) Modulus of the protective layer: The polarizer protective layer composition was applied to a release film (for example, polyethylene terephthalate film) at a thickness of 50 탆, cured at an illuminance of 400 mw / cm 2 and a light quantity of 1,000 mJ / , The prepared adhesive film was cut into a width x length (10 mm x 100 mm) and the specimen was fixed to DMA (Q800, TA Instruments). In the analysis mode, tension film, 25 μm in amplitude, 0.5 N, a heating rate of 10 ° C / min, a temperature range of -50 ° C to 100 ° C, a frequency of 1 Hz and a strain of 0.5%, and the value at 25 ° C was obtained by storage modulus.

5) Polycrystalline surface cracking occurred and the maximum length of the crack generated at the end of the polarizer: To investigate the cracking level under the thermal shock condition of the polarizing plate, the polarizer was cut in the width x length (50 mm x 50 mm) Prepare the sample. The temperature was raised from -40 ° C to 85 ° C, and left to stand for 30 minutes at -40 ° C and left for 30 minutes at 85 ° C, followed by 100 cycles of 1 cycle. In the reflection mode under the fluorescent lamp and the back light mode, And the length and the longest length were measured. X was evaluated when zero cracks occurred on the front surface of the polarizer, and was evaluated as O when 1 to 30 cracks were generated.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. As will be understood by those skilled in the art. It is to be understood, therefore, that the embodiments described above are intended to be illustrative in all respects and not restrictive.

100, 101, 102: polarizer 110: polarizer
120: Optical film 130, 131, 132: Protective layer
210: liquid crystal display panel 220, 230: polarizer
240: Light source part

Claims (10)

(A) a polyester (meth) acrylate, (B) a (meth) acrylate having a hydroxyl group and (C) an isocyanurate compound,
Wherein the polarizer protective layer composition has a glass transition temperature (Tg) after curing of 50 DEG C or more,
Wherein the polarizer protective layer composition has a modulus at 25 占 폚 after curing of 1,000 MPa to 2,500 MPa.
The composition according to claim 1, wherein the composition comprises (A) 25 to 80% by weight of a polyester (meth) acrylate, (B) 5 to 60% by weight of a (meth) acrylate having a hydroxyl group, and (C) And 5 to 30% by weight of a compound.
The composition according to claim 1, wherein the composition comprises (D) 0.1 to 10 parts by weight of (D) a photosensitizer and (E) 0.1 to 10 parts by weight of a photo radical polymerization initiator, relative to 100 parts by weight of the total of (A) By weight based on the total weight of the polarizer protective layer composition.
A polarizer protective layer formed from the composition of any one of claims 1 to 3.
5. The polarizer protecting layer of claim 4, wherein the protective layer has a modulus at 25 DEG C of from 1,000 MPa to 2,500 MPa.
5. The polarizer protecting layer of claim 4, wherein the protective layer has a modulus at 25 DEG C of not less than 2,000 MPa and not more than 2,500 MPa.
The polarizer protecting layer according to claim 4, wherein the protective layer has a thickness of 1 占 퐉 to 10 占 퐉.
A polarizer; And a polarizer protective layer according to claim 4 formed on one side or both sides of the polarizer.
The polarizer according to claim 8, wherein the polarizer comprises an optical film formed on a back surface of the polarizer, the polarizer protective layer comprising a polarizer protective layer according to claim 4 on one side of the polarizer.
An optical display device comprising the polarizing plate of claim 8.

KR1020140169209A 2014-11-28 2014-11-28 Composition of protective layer for polarizing plate, protective layer prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same KR101780533B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020140169209A KR101780533B1 (en) 2014-11-28 2014-11-28 Composition of protective layer for polarizing plate, protective layer prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same
PCT/KR2015/006035 WO2016085072A1 (en) 2014-11-28 2015-06-15 Polarizer protective layer composition, polarizer protective layer manufactured therefrom, polarizing plate comprising same and optical display device comprising same
TW104130515A TWI573835B (en) 2014-11-28 2015-09-16 Composition for polarizer protective layers, polarizer protective layer prepared using the same, polarizing plate including the same, and optical display including the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140169209A KR101780533B1 (en) 2014-11-28 2014-11-28 Composition of protective layer for polarizing plate, protective layer prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same

Publications (2)

Publication Number Publication Date
KR20160065409A KR20160065409A (en) 2016-06-09
KR101780533B1 true KR101780533B1 (en) 2017-09-22

Family

ID=56074591

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020140169209A KR101780533B1 (en) 2014-11-28 2014-11-28 Composition of protective layer for polarizing plate, protective layer prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same

Country Status (3)

Country Link
KR (1) KR101780533B1 (en)
TW (1) TWI573835B (en)
WO (1) WO2016085072A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101955765B1 (en) * 2016-08-31 2019-03-07 삼성에스디아이 주식회사 Polarizing plate and optical display apparatus comprising the same
KR102027566B1 (en) * 2016-09-30 2019-10-01 삼성에스디아이 주식회사 Polarizing plate and optical display apparatus comprising the same
US11650362B2 (en) 2018-06-29 2023-05-16 Lg Chem, Ltd. Polarizing plate, liquid crystal panel and display device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003185841A (en) * 2001-12-19 2003-07-03 Fuji Photo Film Co Ltd Polarizing plate with cured coating film, device for manufacturing the same, and liquid crystal display
JP2013178489A (en) * 2012-01-31 2013-09-09 Hoya Corp Manufacturing method of polarizing lens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003154616A (en) * 2001-11-20 2003-05-27 Teijin Dupont Films Japan Ltd Laminated film and surface protective film
TWI268371B (en) * 2001-12-21 2006-12-11 Sony Chemicals & Information Device Corp Polarizing plate which has a thin protective film formed at least one surface of a polarizer
FR2893422B1 (en) * 2005-11-14 2008-03-07 Essilor Int OPHTHALMIC LENS COMPRISING A PROTECTIVE COATING AGAINST PHOTODEGRADATION AND METHOD FOR PREPARING SUCH AN OPHTHALMIC LENS.
KR101145582B1 (en) * 2009-03-23 2012-05-15 디아이씨 가부시끼가이샤 Adhesive protective film, screen panel, and portable electronic terminal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003185841A (en) * 2001-12-19 2003-07-03 Fuji Photo Film Co Ltd Polarizing plate with cured coating film, device for manufacturing the same, and liquid crystal display
JP2013178489A (en) * 2012-01-31 2013-09-09 Hoya Corp Manufacturing method of polarizing lens

Also Published As

Publication number Publication date
WO2016085072A1 (en) 2016-06-02
KR20160065409A (en) 2016-06-09
TW201619286A (en) 2016-06-01
TWI573835B (en) 2017-03-11

Similar Documents

Publication Publication Date Title
KR101293879B1 (en) Pressure sensitive adhesive composition
CN109073817B (en) Laminated resin film and method for producing same, laminated optical film, image display device, and easy-adhesion-treated resin film
KR101114924B1 (en) Composition for primer coating, optical film comprising the same, and polarizing plate comprising the same
KR101780540B1 (en) Polarizing plate and optical display apparatus comprising the same
US20180052269A1 (en) Polarizing film and method for manufacturing same, optical film, and image display device
CN108603035B (en) Curable resin composition, polarizing film and method for producing same, optical film, and image display device
KR20130022396A (en) Polarizing plate
TW201329531A (en) Polarizing plate
KR101422662B1 (en) Adhesive film with retardation, method for preparing the same and optical member using the same
KR20140128222A (en) Polarizing film and method for manufacturing the same, optical film, and image display device
CN108473606B (en) Curable resin composition
JP2015052710A (en) Polarizing plate and manufacturing method of the same
KR101566056B1 (en) Acrylic Adhesive Composition, Polarizer and Liquid Crystal Display Comprising the Same
KR20150023383A (en) Active energy ray curable adhesive composition, polarizing film and method for producing same, optical film and image display device
KR101780533B1 (en) Composition of protective layer for polarizing plate, protective layer prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same
CN107407769B (en) Polarizing plate and optical display device including the same
TWI730485B (en) Polarizing plate for light emitting displays and light emitting display comprising the same
KR20220079450A (en) Adhesive composition for polarizing film, polarizing film, optical film, and image display device
KR101813756B1 (en) Adhesive for polarizing plate, and display device using the same
KR101515671B1 (en) Adhesive composition
KR20210130699A (en) Manufacturing method of polarizing film, polarizer with easy adhesion layer formation, polarizing film, optical film, and image display device
JP7288306B2 (en) POLARIZING FILM AND MANUFACTURING METHOD THEREOF, OPTICAL FILM AND IMAGE DISPLAY DEVICE
KR101933259B1 (en) Polarizing plate
KR20240025499A (en) Polarizing film and image display device
CN115702372A (en) Polarizing film, optical film, and image display device

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right