KR20170093442A - Polarizer and method for manufacturing the same - Google Patents

Polarizer and method for manufacturing the same Download PDF

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KR20170093442A
KR20170093442A KR1020160014834A KR20160014834A KR20170093442A KR 20170093442 A KR20170093442 A KR 20170093442A KR 1020160014834 A KR1020160014834 A KR 1020160014834A KR 20160014834 A KR20160014834 A KR 20160014834A KR 20170093442 A KR20170093442 A KR 20170093442A
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resin layer
substrate
heat
crystallinity
disposed
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KR1020160014834A
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KR101871568B1 (en
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박기호
이범덕
이배욱
홍완택
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삼성에스디아이 주식회사
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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
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00634—Production of filters
    • B29D11/00644—Production of filters polarizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Polarising Elements (AREA)

Abstract

Provided are a polarizing element and a manufacturing method thereof with improved polarizing optical properties and reliability. The polarizing element comprises: a substrate; and a resin layer arranged on one surface of the substrate, and including poly vinyl alcohol having a degree of crystallinity of 1-1.5. The method for manufacturing the polarizing element comprises the steps of: forming the resin layer including the poly vinyl alcohol on the one surface of the substrate; and treating the resin layer with heat to have the degree of crystallinity of 1-1.5.

Description

[0001] POLARIZER AND METHOD FOR MANUFACTURING THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing element and a manufacturing method thereof, and more particularly, to a thin polarizing element applied to a display device and a manufacturing method thereof.

A polarizing element is a device that converts the polarization of light. The polarizing element transmits specific polarized light and absorbs or reflects a specific polarized light. Therefore, when non-polarized light passes through the polarizing element, only light of a specific polarized light can be extracted. Light polarized in a specific direction can contribute to adjusting the brightness of the display device, improving the display quality of the display device, or expressing a specific display.

For example, the liquid crystal display controls the phase of the polarized light of the liquid crystal layer, and controls the amount of light extracted by passing the polarized light through the polarized element. In the organic light emitting diode display, when polarized light is polarized in a specific direction when external light is incident, the polarized light passes through the polarizing element again when the polarized light is reflected by the wiring or the like, The amount of reflection is adjusted to improve the contrast. Also, in a three-dimensional display device, polarized light is used to distinguish the left eye image and the right eye image, and a polarizing element is also used for the display panel and the polarizing glasses at this time.

A commonly used polarizing element comprises a substrate, a resin layer formed on the substrate, and a dichroic dye oriented in the resin layer. A process of orienting a dichroic dye in a specific direction is required in order to impart polarizing properties in the manufacturing process of a polarizing element. Usually, the orientation of the dichroic dye is facilitated through a step of stretching the substrate and the resin layer.

However, the stretching process can weaken the bonding force of the resin layer formed on the substrate. During the wet stretching process, the resin layer may dissolve in the wetting solution and may fall off. If the resin layer is not stably bonded to the substrate, the polarization property of the polarizing element is lowered, and the reliability of the polarizing element may be lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a polarizing element with improved polarization optical characteristics and reliability.

Another object of the present invention is to provide a method of manufacturing a polarizing element with improved polarization optical characteristics and reliability.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing the same.

According to an aspect of the present invention, there is provided a polarizing element comprising a base material and a resin layer disposed on one surface of the base material and including polyvinyl alcohol having a crystallinity of 1 to 1.5.

Here, the surface of the substrate exhibits hydrophobicity, and the resin layer is disposed so as to directly contact one surface of the substrate, and the resin layer may not include an acetoacetyl group.

The resin layer may be a second resin layer, and may further include a first resin layer disposed between the substrate and the second resin layer, the first resin layer having a thickness smaller than that of the second resin layer.

The surface of the base material may be hydrophobic and the first resin layer may be disposed to directly contact one surface of the base material. The second resin layer may be disposed to directly contact one surface of the first resin layer, 2 The crystallinity of the resin layer may be 1 to 1.5.

In addition, the first resin layer may further include an acetoacetyl group, and the second resin layer may not include an acetoacetyl group.

According to another aspect of the present invention, there is provided a method of manufacturing a polarizing element, comprising: forming a resin layer including polyvinyl alcohol on one surface of a substrate; and forming a resin layer having a crystallinity of 1 to 1.5 And heat treating the resin layer.

Here, the method of manufacturing a polarizing element may further include a step of adsorbing a dichroic substance to the resin layer after the step of heat-treating the resin layer, and a step of stretching the substrate and the resin layer by a wet process.

The surface of the substrate may be hydrophobic and the resin layer may be disposed to directly contact one surface of the substrate. The resin layer may not include an acetoacetyl group, and the step of heat- And a heat treatment so as to have a crystallinity of 1 to 1.5.

In addition, the step of heat-treating the resin layer may include a heat treatment at a temperature of 80 to 160 ° C for 1 to 30 minutes.

Wherein the resin layer is a second resin layer, and further comprising forming a first resin layer on one surface of the substrate before forming the second resin layer on one surface of the substrate, wherein the step of forming the second resin layer May be formed on one surface of the first resin layer.

Wherein the surface of the base material is hydrophobic and the first resin layer is disposed in direct contact with one surface of the base material, the second resin layer is disposed in direct contact with one surface of the first resin layer, The step of heat-treating the stratum may be a step of heat-treating the second resin layer so as to have a crystallinity of 1 to 1.5.

Wherein the surface of the base material is hydrophobic and the first resin layer is disposed in direct contact with one surface of the base material, the second resin layer is disposed in direct contact with one surface of the first resin layer, The step of heat-treating the stratum may be a step of heat-treating the second resin layer so as to have a crystallinity of 1 to 1.25.

The step of heat-treating the second resin layer may include a heat treatment at a temperature of 70 to 120 ° C for 1 to 10 minutes.

In addition, the first resin layer may further include an acetoacetyl group, and the second resin layer may not include an acetoacetyl group.

The details of other embodiments are included in the detailed description and drawings.

According to the polarizing element according to the embodiments of the present invention, since the resin layer has an appropriate degree of crystallinity, it can exhibit a good degree of polarization while having a sufficient bonding force with the base. Thus, the polarization optical characteristics and reliability of the polarizing element can be improved.

According to the polarizing element manufacturing method according to the embodiments of the present invention, even if a resin layer is formed by a coating process that is a relatively simple process and a wet drawing process is performed without laminating the PVA film by lamination, The bonding can be stably maintained.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a cross-sectional view of a polarizing element according to an embodiment of the present invention.
2 is a cross-sectional view of a polarizing element according to another embodiment of the present invention.
3 is a flowchart of a method of manufacturing a polarizing element according to an embodiment of the present invention.
4 is a flowchart of a method of manufacturing a polarizing element according to another embodiment of the present invention.
5 is a graph showing the FTIR spectra of the PVA films of the thin film polarizing element according to Production Examples 1 and 2 and Comparative Example.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that elements or layers are referred to as being "on " other elements or layers, including both intervening layers or other elements directly on or in between. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

It should also be understood that the steps constituting the manufacturing method described herein may be sequential or sequential, or one step and the other step constituting one manufacturing method may be performed in the order described in the specification It is not construed as limited. Therefore, the order of the steps of the manufacturing method can be changed within a range that can be easily understood by a person skilled in the art, and a change apparent to a person skilled in the art accompanying thereto is included in the scope of the present invention.

1 is a cross-sectional view of a polarizing element according to an embodiment of the present invention.

Referring to FIG. 1, a polarizing element 10 according to an embodiment of the present invention includes a substrate 100, and a resin layer 110 disposed on one side of the substrate 100.

The substrate 100 may be optically transparent. The substrate 100 may be made of, but not limited to, polyolefin, polycarbonate, polyacrylate, polyethylene terephthalate, polyethylene, triacetylcellulose, polystyrene, polyimide, polypropylene, cycloolefin, polyurethane resin and the like .

In an exemplary embodiment, the substrate 100 comprises a hydrophobic material and may exhibit hydrophobicity on the surface. For example, the substrate 100 may be made of polypropylene, which is a polyolefin resin.

A resin layer 110 is disposed on one surface of the substrate 100. The resin layer 110 can be disposed in direct contact with the substrate 100 without an adhesive layer or another layer interposed therebetween. The resin layer 110 may be a coating layer formed by coating. The resin layer 110 may be arranged to cover the entire surface of the substrate 100. The resin layer 110 may have a uniform thickness over the entire surface of the substrate 100. The thickness d of the resin layer 110 may be 5um or more and 30um or less.

As the material constituting the resin layer 110, a material which facilitates adsorption of a dichroic substance together with stretching is suitable. An example of the material constituting the resin layer 110 is polyvinyl alcohol (PVA). That is, the resin layer 110 may be a PVA layer or a PVA film.

The resin layer 110 may have a relatively high degree of crystallinity. When the base material 100 is made of a material exhibiting hydrophobicity, the surface of the base material 100 is hydrophobic and the binding force between the resin layer 110 and the base material 100 is weak. For example, in the wet stretching process, a part of the resin layer 110 formed on the substrate 100 may be peeled off. If the resin layer 110 has a high degree of crystallinity, the material constituting the resin layer 110 in the wet stretching process, for example, the polyvinyl alcohol resin, is prevented from dissolving, The degree of swelling of the polyvinyl alcohol as the constituent material of the stratum 110 can be reduced and the separation phenomenon with the substrate 100 can be reduced.

On the other hand, if the crystallinity of the resin layer 110 is too high, the degree of polarization of the polarizing element 10 can be reduced.

In view of the above, the degree of crystallization of the resin layer 110 for maintaining a good degree of polarization while ensuring a sufficient bonding force between the substrate 100 and the resin layer 110 is in the range of 1 to 1.5, or in the range of 1.15 to 1.35 . In the following experimental example, it will be shown that the resin layer 110 having a crystallinity of 1.29 exhibits sufficient bonding strength with the substrate 100.

The substrate 100 and the resin layer 110 may be stretched. The stretching magnification may be 5 to 15 times, but the present invention is not limited thereto.

A dichroic material may be adsorbed and oriented on the stretched resin layer 110. The dichroic material may include iodine, organic dyes, or mixtures thereof.

A protective film 130 may be disposed on the resin layer 110. The protective film 130 may include triacetyl cellulose (TAC), polyester, olefin, and acrylic resin. The protective film 130 can prevent the resin layer 110 exhibiting polarization characteristics from being damaged by external moisture. The thickness of the protective film 130 may range from 5 to 100 mu m. When the above range is satisfied, a thin polarizer can be realized.

An adhesive layer 120 may be interposed between the resin layer 110 and the protective film 130. The adhesive layer 120 bonds the resin layer 110 and the protective film 130 together.

The adhesive layer 120 may include an aqueous adhesive or an ultraviolet curable adhesive.

The water-based adhesive may include at least one selected from the group consisting of a polyvinyl alcohol resin, an acrylic resin and a vinyl acetate resin, or may include a polyvinyl alcohol resin having an acrylic group and a hydroxyl group, but is not limited thereto .

The ultraviolet curable adhesive may include an acrylic compound. For example, the ultraviolet curing type adhesive may include an acrylic type, a urethane-acrylic type, and an epoxy type resin. However, the present invention is not limited thereto.

2 is a cross-sectional view of a polarizing element according to another embodiment of the present invention.

2, the polarizing element 11 according to the present embodiment has a structure in which the first resin layer 111 and the second resin layer 112 are sequentially disposed on one surface of the base 100, . ≪ / RTI > The first resin layer 111 is formed directly on one surface of the substrate 100. The second resin layer 112 is formed directly on one surface of the first resin layer 111. The dichroic material is adsorbed and oriented in the second resin layer 112. The first resin layer 111 serves to couple the substrate 100 and the second resin layer 112 together.

The first resin layer 111 and the second resin layer 112 may be made of the same series of materials. However, the specific constituent materials of the first resin layer 111 and the second resin layer 112 may be different. For example, the first resin layer 111 may be formed of polyvinyl alcohol containing an acetoacetyl group, and the second resin layer 112 may be formed of polyvinyl alcohol. The polyvinyl alcohol in the second resin layer 112 may not contain an acetoacetyl group.

The second resin layer 112 may be thicker than the first resin layer 111. For example, the thickness d1 of the first resin layer 111 may be 100 nm or more and 1um or less, and the thickness d2 of the second resin layer 112 may be 5um or more and 30um or less.

The degree of crystallization of the second resin layer 112 may be in the range of 1 to 1.5 as in the case of the resin layer 110 of the embodiment of FIG. Since the second resin layer 112 is bonded to the substrate 100 by the first resin layer 111, the second resin layer 112 exhibits a relatively higher bonding force than the resin layer 110 in the embodiment of FIG. 1, It is possible to prevent the phenomenon of being separated from the base material 100 in the wet stretching process even if the degree of crystallization is lower than that of the resin layer 110 of Fig. That is, the degree of crystallization of the second resin layer 112 can be prevented from being separated from the substrate 100 even if the constituent material of the second resin layer 112 is not dissolved in the wet stretching step.

From this point of view, the crystallinity of the second resin layer 112 may be in the range of 1 to 1.35. In the following experimental example, it will be shown that the second resin layer 112 having a crystallinity of 1.17 exhibits a sufficient bonding force with the substrate 100.

Hereinafter, a method of manufacturing a polarizing element as described above will be described.

3 is a flowchart of a method of manufacturing a polarizing element according to an embodiment of the present invention.

Referring to FIGS. 1 and 3, first, a resin layer 110 is formed on a substrate 100 (S11).

Specifically, the substrate 100 is prepared. The prepared substrate 100 may be a non-drawn substrate 100, but is not limited thereto. Next, a resin composition in a solution state containing water is coated on the base material 100. The resin composition may include polyvinyl alcohol. Examples of the resin composition coating method include < K coating, spin coating, slit coating and the like. Then, water is removed through a drying process. The drying process may be omitted or may be integrated with the subsequent heat treatment process of the resin layer 110.

Thereafter, the degree of crystallization of the resin layer 110 is increased (S12). Increasing the degree of crystallization of the resin layer 110 can suppress the dissolution of the resin layer 110 in the subsequent wet stretching process. The degree of swelling of the resin layer 110 can be reduced to suppress the separation phenomenon between the substrate 100 and the resin layer 110 at the interface between the substrate 100 and the resin layer 110.

As a method for increasing the degree of crystallization of the resin layer 110, a heat treatment method can be applied. For example, the substrate 100 on which the resin layer 110 is formed can be heat-treated at a temperature of 80 to 160 ° C for 1 to 30 minutes . Through such a heat treatment process, the degree of crystallization of the resin layer 110 can be increased to a range of 1.20 to 1.50.

Subsequently, the dichroic material is adsorbed on the resin layer 110 (S13). For example, when iodine is adsorbed, an iodine solution is prepared. When an iodine solution is used as the iodine solution, an aqueous solution containing iodine (I2) and iodide ion such as potassium iodide (KI) used as a solubilizing agent may be used. In an exemplary embodiment, the concentration of iodine (I2) ranges from 0.01 to 0.5 wt% based on the total weight of the aqueous solution, and the concentration of potassium iodide (KI) ranges from 0.01 to 10 wt% based on the total weight of the aqueous solution . The temperature of the iodine solution may range from 20 캜 to 50 캜.

Subsequently, the substrate 100 in which the resin layer 110 is formed is impregnated in the iodine solution. The impregnation time may range from 10 to 300 seconds.

Subsequently, the substrate 100 on which the resin layer 110 is formed is stretched (S14). The stretching process may proceed to a wet process. For example, the substrate 100 on which the resin layer 110 is formed can be placed in a bath containing an alcohol, water, or an aqueous boric acid solution, and then stretched. It is obvious to those skilled in the art that the stretching temperature may be 50 to 80 캜, but the specific stretching temperature and time may be appropriately selected depending on the material of the film, the desired elongation, the method of use, and the like.

The stretching step may be uniaxial stretching or biaxial stretching. In order to manufacture a polarizing element attached to a liquid crystal cell, biaxial stretching may be performed so as to realize a retardation property. The draw ratio may be about 5 to 15 times.

As described above, when the crystallinity of the resin layer 110 is in the range of 1.0 to 1.50, dissolution of the resin layer 110 can be suppressed in the wet drawing process. The degree of swelling of the resin layer 110 at the interface between the substrate 100 and the resin layer 110 can be reduced to suppress the separation phenomenon between the substrate 100 and the resin layer 110. That is, even if the resin layer 110 is formed by coating, which is a relatively simple process, without the lamination of the PVA film by lamination and the wet stretching process is performed, the bond between the substrate 100 and the resin layer 110 can be stably maintained have.

4 is a flowchart of a method of manufacturing a polarizing element according to another embodiment of the present invention.

Referring to FIGS. 2 and 4, a first resin layer 111 is formed on the substrate 100 (S21).

Specifically, first, the base material 100 is prepared. The prepared substrate 100 may be a non-drawn substrate 100, but is not limited thereto. A first resin composition in a solution state containing water is coated on the base material (100). The first resin composition may comprise polyvinyl alcohol containing an acetoacetyl group.

Then, the first resin composition is dried. A heat treatment process may be employed for drying the first resin composition. For example, the first resin composition is dried by heat treatment at a relatively low temperature of 50 to 70 DEG C for 30 seconds to 3 minutes. As a result of drying the first resin composition, a firm bonding force is imparted between the base material 100 and the first resin layer 111.

Next, a second resin layer 112 is formed on one surface of the first resin layer 111 (S22). Specifically, the second resin composition in a solution state is coated on the first resin layer 111. And the second resin polyvinyl alcohol, but unlike the first resin composition, it may not contain an acetoacetyl group. The second resin layer 112 is formed thicker than the first resin layer 111.

Then, the degree of crystallization of the second resin layer 112 is increased (S23). Increasing the degree of crystallization of the second resin layer 112 can suppress the dissolution of the resin layer 110 in the subsequent wet stretching process. Meanwhile, in the present embodiment, since the base 100 and the first resin layer 111 are firmly coupled to each other and the second resin layer 112 is in contact with the first resin layer 111, The possibility that the second resin layer 112 is separated from the base material 100 is relatively low even if the degree of swelling of the base resin layer 112 is slightly increased. Thus, stable bonding of the second resin layer 112 is possible, even if it does not have as high a degree of crystallinity as the embodiments of Figs.

A heat treatment method may also be applied to increase the crystallinity of the second resin layer 112, which may proceed to lower temperatures than the embodiments of FIGS. 1 and 3. For example, the heat treatment may be conducted at a temperature of 70 to 120 DEG C for 1 to 10 minutes. Through such a heat treatment step, the crystallinity of the second resin layer 112 can be increased to a range of 1 to 1.25.

Subsequently, the dichroic material is adsorbed on the second resin layer 112 (S24), and the base material 100 on which the first resin layer 111 and the second resin layer 112 are formed is stretched (S25). The method of adsorbing and stretching the dichroic material to the second resin layer 112 is substantially the same as the method of adsorbing and stretching the dichroic material to the resin layer 110 in Fig. 3, and thus a duplicate description thereof will be omitted.

As described above, when the crystallinity of the second resin layer 112 is in the range of 1 to 1.25, dissolution of the second resin layer 112 in the wet drawing process can be suppressed. In addition, since the first resin layer 111 intervenes between the substrate 100 and the second resin layer 112 to strongly bond them, separation phenomenon due to swelling of the second resin layer 112 can be suppressed.

Hereinafter, embodiments of the present invention will be described in more detail with reference to Production Examples and Experimental Examples.

≪ Preparation Example 1 &

 Layered coextruded olefin-based polypropylene base film was coated with a first PVA resin having a concentration of 3.3w% of PVA containing an acetoacetyl group and dried at about 60 ° C for 1 minute and 30 seconds to obtain a first PVA layer was formed. A second PVA resin not containing about 6w% of acetoacetyl group was coated on the first PVA layer and dried at 75 ° C for 3 minutes to form a second PVA layer having a thickness of 15um. Thus, a PVA film having a two-layer structure was prepared . Thereafter, the base film and the PVA film laminated thereon were heat-treated at about 110 DEG C for 5 minutes. The second PVA resin used herein had a degree of polymerization of 3,300 or more and a saponification degree of 99.99% or more.

The polypropylene-based film and the PVA film formed thereon were immersed in a bath filled with distilled water at 60 ° C to swell the PVA film, and then the base film and the PVA film were stretched together. The stretching ratio was 6 times. Thereafter, the PVA film was dried. The resulting PVA film thickness (i.e., the sum of the thicknesses of the first PVA layer and the second PVA layer) of the obtained thin film highly functional polarizing element was about 8 mu.

 ≪ Preparation Example 2 &

 A three layer coextruded olefinic polypropylene base film having a thickness of 70 탆 was coated with a PVA resin not containing about 6 wt% of an acetoacetyl group to prepare a PVA film having a one-layer structure with a thickness of 15 탆. Then, the base film and the PVA film laminated thereon were heat-treated at about 140 ° C for 5 minutes. The PVA resin used herein had a degree of polymerization of 3,300 or more and a saponification degree of 99.99% or more.

The polypropylene base film and the PVA film formed thereon were immersed in a bath filled with an aqueous solution at 60 캜 to swell the PVA film, and then the base film and the PVA film were stretched together. The stretching ratio was 6 times. Thereafter, the PVA film was dried. The resulting thin film highly functional polarizing element had a thickness of 8 mu m of PVA film.

<Comparative Example>

A three layer coextruded olefinic polypropylene base film having a thickness of 70 탆 was coated with a PVA resin not containing about 6 wt% of an acetoacetyl group to prepare a PVA film having a one-layer structure with a thickness of 15 탆. No separate heat treatment was performed after the PVA film was produced. The PVA used had a degree of polymerization of 3,300 or more and a saponification degree of 99.99% or more.

The PVA film laminated on the substrate was immersed in a bath filled with an aqueous solution of 60 DEG C or higher to swell the PVA film, and then the base film and the PVA film were stretched together. The stretching ratio was 6 times. Thereafter, the PVA film was dried. The resulting PVA film thickness of the thin film polarizing element was 8 μm.

Experimental Example  One: Swelling tank Peelability  inspection

In Production Examples 1 and 2 and Comparative Examples, the peeling between the substrate and the PVA film was visually inspected in the swelling process before the stretching process. The results are shown in Table 1 below.

Experimental Example  2: Surface dissolution test

On the thin film polarizing element according to Production Examples 1 and 2 and Comparative Example, the surface of the PVA film was visually observed for dissolution. The results are shown in Table 1 below.

Experimental Example  3: Crystallization test

In-situ ATR-FTIR study "(Polymer Testing 27 (2008) 360-367) was performed on the thin film polarizing element according to Production Examples 1, 2 and Comparative Example in" Effect of silica nanofillers on isothermal crystallization of poly The crystallinity was analyzed according to ATR-FTIR (Attenuated total reflectance Fourier-transform infrared) method described in the paper. The FTIR spectra for each are shown in FIG. In Fig. 5, the horizontal axis represents the wavelength and the vertical axis represents the absorption. From the spectrum of FIG. 5, the degree of crystallization peaks in the PVA film was analyzed quantitatively and the degree of crystallization for each PVA film was calculated and shown in Table 1 below.

division Swelling tank
Peelability Surface dissolution
phenomenon Crystallinity
(ATR-FTIR method) Production Example 1 Not peeled Not soluble 1.17 Production Example 2 Not peeled Not soluble 1.29 Comparative Example 1 Exfoliation Dissolution 0.85

Referring to Table 1, in the case of Production Example 1 and Production Example 2 having a degree of crystallization of 1.17 and 1.29, peeling of PVA film and surface dissolution phenomenon were not observed. On the other hand, in the case of Comparative Example 1 in which the heat treatment was not performed, the PVA film was peeled off and the surface was dissolved due to the crystallinity of 0.85. From the above experimental results, it can be confirmed that the PVA film having the degree of crystallinity in the range of 1 to 1.5 is prevented from peeling and dissolution, and thus the reliability is high.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: polarizing element
100: substrate
110: resin layer
120: adhesive layer
130: protective film

Claims (14)

materials; And
And a resin layer disposed on one side of the substrate and including polyvinyl alcohol having a crystallinity of 1 to 1.5. The method according to claim 1,
The surface of the substrate exhibits hydrophobicity,
Wherein the resin layer is disposed in direct contact with one surface of the substrate,
Wherein the resin layer does not contain an acetoacetyl group. The method according to claim 1,
Wherein the resin layer is a second resin layer,
And a first resin layer disposed between the substrate and the second resin layer and having a thickness smaller than that of the second resin layer. The method of claim 3,
The surface of the substrate exhibits hydrophobicity,
Wherein the first resin layer is disposed in direct contact with one surface of the substrate,
Wherein the second resin layer is disposed in direct contact with one surface of the first resin layer,
And the crystallinity of the second resin layer is 1 to 1.5. The method of claim 3,
Wherein the first resin layer further comprises an acetoacetyl group,
And the second resin layer does not contain an acetoacetyl group. Forming a resin layer containing polyvinyl alcohol on one side of the substrate; And
And heat treating the resin layer so that the resin layer has a crystallinity of 1 to 1.5. The method according to claim 6,
After the step of heat-treating the resin layer,
Adsorbing a dichroic substance on the resin layer; And
Further comprising the step of stretching the substrate and the resin layer by a wet process. The method according to claim 6,
The surface of the substrate exhibits hydrophobicity,
Wherein the resin layer is disposed in direct contact with one surface of the substrate,
Wherein the resin layer contains no acetoacetyl group,
Wherein the step of heat-treating the resin layer is a step of heat-treating the resin layer so as to have a crystallinity of 1 to 1.30. 9. The method of claim 8,
Wherein the heat treatment of the resin layer comprises a heat treatment at a temperature of 80 to 160 DEG C for 1 to 30 minutes. 9. The method of claim 8,
Wherein the resin layer is a second resin layer,
Further comprising the step of forming a first resin layer on one surface of the substrate before forming the second resin layer on one surface of the substrate,
Wherein the step of forming the second resin layer is formed on one surface of the first resin layer. 11. The method of claim 10,
The surface of the substrate exhibits hydrophobicity,
Wherein the first resin layer is disposed in direct contact with one surface of the substrate,
Wherein the second resin layer is disposed in direct contact with one surface of the first resin layer,
Wherein the step of heat-treating the second resin layer is a step of heat-treating the second resin layer so that the second resin layer has a crystallinity of 1 to 1.5. 11. The method of claim 10,
The surface of the substrate exhibits hydrophobicity,
Wherein the first resin layer is disposed in direct contact with one surface of the substrate,
Wherein the second resin layer is disposed in direct contact with one surface of the first resin layer,
Wherein the step of heat-treating the second resin layer is a step of heat-treating the second resin layer so that the second resin layer has a crystallinity of 1 to 1.5. 13. The method of claim 12,
Wherein the step of heat-treating the second resin layer comprises a step of heat-treating at a temperature of 70 to 120 ° C for 1 to 10 minutes. 13. The method of claim 12,
Wherein the first resin layer further comprises an acetoacetyl group,
And the second resin layer does not contain an acetoacetyl group.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006305923A (en) * 2005-04-28 2006-11-09 Nippon Synthetic Chem Ind Co Ltd:The Polyvinyl alcohol film, its manufacturing method, polarizing film and polarizing plate
WO2013146644A1 (en) * 2012-03-29 2013-10-03 住友化学株式会社 Laminate film, method for producing polarizing laminate film, and method for producing polarizing plate
JP2014059328A (en) * 2010-09-03 2014-04-03 Nitto Denko Corp Polarizing film, optical film laminate including polarizing film, and stretched laminate to be used for production of optical film laminate including polarizing film

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006305923A (en) * 2005-04-28 2006-11-09 Nippon Synthetic Chem Ind Co Ltd:The Polyvinyl alcohol film, its manufacturing method, polarizing film and polarizing plate
JP2014059328A (en) * 2010-09-03 2014-04-03 Nitto Denko Corp Polarizing film, optical film laminate including polarizing film, and stretched laminate to be used for production of optical film laminate including polarizing film
WO2013146644A1 (en) * 2012-03-29 2013-10-03 住友化学株式会社 Laminate film, method for producing polarizing laminate film, and method for producing polarizing plate

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