KR20210119926A - Method of producing pressure-sensitive adhesive layer attached one-side protection polarizing film - Google Patents

Abstract

An object is to provide a manufacturing method of a one-side protection polarizing film with an adhesive layer, capable of satisfying durability even when the method is applied to a thin polarizer. The manufacturing method of a one-side protection polarizing film with an adhesive layer includes: (1) a process of preparing a one-side protection polarizing film with a resin substrate; (2) a process of removing the resin substrate from the one-side protection polarizing film with the resin substrate; (3) a process of activating a surface of a polarizer under the condition of a cumulative irradiation quantity of 0.01 to 2 J/cm^2 of activation energy; and (4) a process of directly laminating an adhesive layer on the surface of the polarizer.

Description

The manufacturing method of the side protection polarizing film with an adhesive layer formed {METHOD OF PRODUCING PRESSURE-SENSITIVE ADHESIVE LAYER ATTACHED ONE-SIDE PROTECTION POLARIZING FILM}

The present invention relates to a method for producing a single protective polarizing film with an adhesive layer in which a transparent protective film is laminated only on one side of a polarizer and an adhesive layer is directly laminated on the other side. The single protective polarizing film with an adhesive layer obtained by the said manufacturing method can form image display apparatuses, such as a liquid crystal display device (LCD), an organic electroluminescence display, CRT, PDP, as this alone or as an optical film laminated|stacking this. have.

In watches, mobile phones, PDAs, notebook PCs, PC monitors, DVD players, TVs, etc., liquid crystal displays are rapidly developing in the market. A liquid crystal display device visualizes the polarization state by switching of a liquid crystal, From the display principle, a polarizer is used.

As a polarizer, since it has a high transmittance|permeability and a high polarization degree, for example, iodine is made to adsorb|suck to polyvinyl alcohol, and the iodine type polarizer of the structure extended|stretched is used most generally and widely. Such a polarizer has a disadvantage in that mechanical strength is extremely weak, and the polarization function is remarkably reduced due to shrinkage by heat or moisture. Therefore, the obtained polarizer is immediately bonded through the transparent protective film and adhesive agent to which the adhesive agent was coated, and is used as a polarizing film.

Moreover, when sticking a polarizing film to a liquid crystal cell, an adhesive is used normally. In addition, since adhesion|attachment of a polarizing film and a liquid crystal cell reduces the loss of light normally, each material is closely_contact|adhered using an adhesive. In such a case, from the viewpoint of not requiring a drying process to fix the polarizing film, the pressure-sensitive adhesive is generally a polarizing film having an adhesive layer formed in advance as an adhesive layer on one side of the polarizing film. used

On the other hand, in image display apparatuses, such as a liquid crystal display device, thickness reduction is advancing, and thickness reduction is calculated|required also about the polarizing film with an adhesive layer. For example, by stretching and dyeing a laminate having a resin substrate and a polyvinyl alcohol-based resin layer formed on one side of the resin substrate, a polarizer composed of a thin polarizing film can be obtained on the resin substrate (Patent Document). One). In addition, the transparent protective film is formed on only one side of the polarizer, and the transparent protective film is not formed on the other side, and the side protective polarizing film with the pressure-sensitive adhesive layer formed directly with the pressure-sensitive adhesive layer is formed on both sides of the polarizer with the transparent protective film Since there are few transparent protective films compared with the polarizing film in which the normal adhesive layer which formed the adhesive layer in one polarizing film was formed, thinning type can be aimed at.

Japanese Laid-Open Patent Publication No. 2000-338329

In the liquid crystal display device, even under severe conditions such as under high temperature or high temperature and high humidity conditions, durability is required that satisfies adhesiveness and does not cause appearance defects. The said durability is calculated|required also about the adhesive layer which concerns on the side protection polarizing film with said adhesive layer.

In the case of producing a single protective polarizing film with an adhesive layer formed thereon by using a polarizer comprising a thin polarizing film formed on one side of the resin substrate, first, a transparent protective film is interposed between the polarizer (polarizing film) and an adhesive. After laminating|stacking and peeling a resin base material then, the one side protection polarizing film with an adhesive layer is produced by laminating|stacking an adhesive layer on the other single side|surface of the polarizer to which the said peeling operation was performed. However, as a single protective polarizing film with an adhesive layer obtained by such a conventional manufacturing method, the thing which satisfied durability was not obtained.

An object of this invention is to provide the manufacturing method of the side protection polarizing film with the adhesive layer which can satisfy durability also when applied to a thin-shaped polarizer.

MEANS TO SOLVE THE PROBLEM As a result of repeating earnest examination in order to solve the said subject, the present inventors found out the manufacturing method of the side protection polarizing film with the following adhesive layer, and came to complete this invention.

That is, the present invention provides a step (1) of preparing a single protective polarizing film with a resin substrate, which has a resin substrate and a polarizer formed on one side of the resin substrate, and a transparent protective film is laminated on the polarizer side;

A step (2) of peeling the resin substrate from the side-protected polarizing film on which the resin substrate is formed;

A step (3) of performing an activation treatment on the surface of the polarizer from which the resin substrate was peeled off by the step (2) on the condition that the cumulative irradiation amount of activation energy is 0.01 to 2 J/cm 2 ;

It has a process (4) of laminating|stacking an adhesive layer directly on the surface of the polarizer to which the said process (3) was given, It is related with the manufacturing method of the side protection polarizing film with an adhesive layer characterized by the above-mentioned.

In the manufacturing method of the side protection polarizing film with the said adhesive layer, a corona treatment, a plasma treatment, or an excimer treatment is employ|adopted preferably as an activation process of the said process (3).

In the manufacturing method of the side protection polarizing film with the said adhesive layer, it is preferable that the thickness of the said polarizer is 10 micrometers or less.

Further, in the method for producing a single protective polarizing film with an adhesive layer, the polarizer is a polarizing film of a continuous web made of a polyvinyl alcohol-based resin in which a dichroic substance is oriented, and a polyvinyl film formed on a thermoplastic resin substrate. When the laminate including the alcohol-based resin layer is obtained by stretching in a two-stage stretching step comprising aerial auxiliary stretching and stretching in boric acid water, it can be preferably applied.

In the manufacturing method of the side protection polarizing film with the said adhesive layer, it is preferable that the said resin base material is an ester-type resin base material.

In the manufacturing method of the side protection polarizing film with the said adhesive layer, as for the said adhesive layer laminated|stacked in the said process (4), an acrylic adhesive layer is preferable.

In the manufacturing method of the side protection polarizing film with the said adhesive layer formed,

Between the step (2) and the step (3),

After bonding a surface protection film to the surface of the polarizer from which the resin base material peeled by the said process (2), you can have the process (5) of peeling.

In the conventional manufacturing method of a one-sided protective polarizing film with an adhesive layer, after peeling a resin base material from the one-sided protective polarizing film with a resin base material, on the surface of a polarizer (for example, polyvinyl alcohol-type resin film), as it is. , the pressure-sensitive adhesive layer was laminated. However, it turned out that foreign materials, such as a material (oligomer etc.) of a resin base material, remain|survived on the surface of a polarizer with peeling of the said resin base material. And it turned out that the said foreign material mixes in an adhesive layer, when an adhesive layer was just stuck to the said polarizer surface of the state in which the said foreign material remained. The said foreign material not only inhibits the adhesiveness (anchoring property) of a polarizer and an adhesive layer, but it crystallizes and precipitates in an adhesive layer, it becomes a luminescent point, and it is thought that it also becomes a cause of an appearance defect. Moreover, even if the said foreign material was not observed in the test|inspection at the time of shipment of the one-sided protection polarizing film with an adhesive layer, it turned out that it may precipitate over time and may become a luminescent point.

In the present invention, after peeling the resin substrate from the single protective polarizing film with the resin substrate, the surface of the polarizer is subjected to activation treatment, and then the pressure-sensitive adhesive layer is laminated directly on the surface of the polarizer subjected to the activation treatment. . By such an activation process, the said foreign material which remained on the surface of a polarizer can be reduced. As a result, it is possible to obtain a single protective polarizing film with an adhesive layer that satisfies the durability related to adhesiveness and poor appearance.

Moreover, in this invention, it is preferable to control the activation energy in an activation process to a predetermined range so that deterioration, quality change, etc. of a polarizer may not generate|occur|produce with an activation process. The deterioration of the said polarizer is easy to generate|occur|produce, when using a thin-shaped polarizer. Control of the said activation energy is preferable, when the polarizer used for the side protection polarizing film with a resin base material is a thin-shaped polarizer. Therefore, even when a thin polarizer is used, the single protective polarizing film with an adhesive layer obtained by the production method of the present invention is not subjected to an activation treatment, and has optical properties comparable to that of a polarizer (for example, optical durability) can be satisfied

Moreover, in order to improve the adhesive strength of a polarizer and a transparent protective film more, after performing an activation process on the surface on which the adhesive bond layer of a polarizer was formed, bonding a polarizer and a transparent protective film together to manufacture a polarizing film is proposed (Unexamined-Japanese-Patent No. Patent Publication No. 2009-008660). However, the said publication makes the improvement of the adhesive strength of a polarizer and a transparent protective film a subject. In addition, foreign substances do not remain on the surface of the polarizer described in the publication.

BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual diagram which shows an example of embodiment which concerns on the manufacturing method of the side protection polarizing film with an adhesive layer of this invention.
It is a conceptual diagram which shows an example of embodiment which concerns on the manufacturing method of the side protection polarizing film with an adhesive layer of this invention.

Hereinafter, the manufacturing method of the side protection polarizing film with the adhesive layer of this invention is demonstrated. As for the one-sided protective polarizing film with an adhesive layer of this invention, the transparent protective film is formed in the single side|surface of a polarizer, and the adhesive bond layer is laminated|stacked directly on the other single side|surface of a polarizer. The one-sidedly protective polarizing film with such an adhesive layer of this invention is obtained by performing a process (1) - a process (4) sequentially to the one-sidedly protective polarizing film with a resin base material. Steps (1) to (4) will be described below with reference to FIG. 1 . Moreover, as shown in FIG. 2, it can have a process (5) between a process (2) and a process (3).

<Step (1)>

In the step (1), the resin substrate 3 and the polarizer 1 formed on one side of the resin substrate 3, and a transparent protective film 2 is laminated on the polarizer 1 side, The one-sidedly protective polarizing film (A) in which the resin base material was formed is prepared.

≪Resin mention≫

Various thermoplastic resins can be used as a material for forming the resin substrate. Examples of the thermoplastic resin include ester-based resins such as polyethylene terephthalate-based resins, cycloolefin-based resins such as norbornene-based resins, olefinic resins such as polypropylene, polyamide-based resins, polycarbonate-based resins, and these of copolymer resins and the like. Among these, the point of manufacturing easiness and cost reduction to an ester resin is preferable. As the ester-based thermoplastic resin substrate, an amorphous ester-based thermoplastic resin substrate or a crystalline ester-based thermoplastic resin substrate may be used.

Various polarizers can be used as said polarizer. As a polarizer, what was obtained by various manufacturing methods can be used. As for the thickness of the said polarizer, although a thing of 30 micrometers or less can be used normally, the manufacturing method of this invention is preferably applied also when using the thin polarizer whose thickness of a polarizer is 10 micrometers or less. From the viewpoint of reduction in thickness, the thickness of the polarizer is preferably 1 to 7 µm. It is preferable that such a thin polarizer has few thickness nonuniformity, is excellent in visibility, and since there are few dimensional changes, it is excellent in durability, and the point which thickness as a polarizing film can also aim at thickness reduction is preferable.

≪Thin polarizer≫

Representatively, as a thin polarizer, Japanese Patent Application Laid-Open No. 51-069644, Japanese Patent Application Laid-Open No. 2000-338329, WO2010/100917 pamphlet, specification of PCT/JP2010/001460, or Japanese Patent Application No. 2010-269002 The thin polarizing film described in the specification or the specification of Japanese Patent Application No. 2010-263692 is mentioned. These thin polarizing films can be obtained by a manufacturing method including the process of extending|stretching a polyvinyl alcohol-type resin (henceforth PVA-type resin) layer and the resin base material for extending|stretching in the state of a laminated body, and the process of dyeing. If it is this manufacturing method, even if the PVA-type resin layer is thin, it becomes possible to extend|stretch without problems, such as a fracture|rupture by extending|stretching, by being supported by the resin base material for extending|stretching.

The thin polarizing film can be stretched at a high magnification among manufacturing methods including a step of stretching and a step of dyeing in the state of a layered product, and thus polarization performance can be improved. It is preferably obtained by a manufacturing method including a step of stretching in an aqueous solution of boric acid as described in the specification of /001460 or Japanese Patent Application No. 2010-269002 or Japanese Patent Application No. 2010-263692, and particularly, Japanese Patent Application No. 2010-269002 What is obtained by the manufacturing method including the process of carrying out auxiliary|assistance aerial stretching before extending|stretching in the boric-acid aqueous solution described in the specification or the specification of Japanese Patent Application No. 2010-263692 is preferable.

The thin high-performance polarizing film described in the specification of the above PCT/JP2010/001460 is a thin high-performance polarizing film with a thickness of 7 μm or less made of a PVA-based resin in which a dichroic material is oriented and formed integrally on a resin substrate, and having a single transmittance of 42.0 % or more and a polarization degree of 99.95% or more.

The thin high-performance polarizing film is produced by forming a PVA-based resin layer on a resin substrate having a thickness of at least 20 μm by coating and drying the PVA-based resin, and immersing the resulting PVA-based resin layer in a dyeing solution of a dichroic material. , By adsorbing the dichroic substance to the PVA-based resin layer, and stretching the PVA-based resin layer on which the dichroic substance is adsorbed in an aqueous boric acid solution so that the total draw ratio is 5 times or more of the original length integrally with the resin substrate, can be manufactured.

In addition, as a method for producing a laminate film including a thin high-performance polarizing film in which a dichroic material is oriented, a resin substrate having a thickness of at least 20 μm and an aqueous solution containing a PVA-based resin on one side of the resin substrate are coated and dried A step of producing a laminate film including a PVA-based resin layer formed by making the above-mentioned laminate film comprising a resin substrate and a PVA-based resin layer formed on one side of a resin substrate, a dyeing solution containing a dichroic substance The process of adsorbing a dichroic substance to the PVA system resin layer contained in a laminated body film by immersing in the said laminated body film containing the PVA system resin layer to which the dichroic substance was adsorbed in boric acid aqueous solution. A PVA system in which the dichroic substance is oriented on one side of the resin substrate by a step of stretching so that the magnification is 5 times or more of the original length, and the PVA-based resin layer to which the dichroic substance is adsorbed is stretched integrally with the resin substrate The thin high-performance polarizing film is manufactured by including a step of manufacturing a laminated film comprising a resin layer and formed into a thin high-performance polarizing film having optical properties of 7 µm or less, a single transmittance of 42.0% or more, and a polarization degree of 99.95% or more can do.

In the present invention, as a polarizer having a thickness of 10 µm or less, as a polarizing film of a continuous web made of a PVA-based resin oriented with a dichroic substance, a laminate comprising a polyvinyl alcohol-based resin layer formed on a thermoplastic resin substrate is air-assisted stretching What was obtained by extending|stretching by the two-stage extending|stretching process which consists of perboric acid underwater extending|stretching can be used. The thermoplastic resin substrate is preferably an amorphous ester-based thermoplastic resin substrate or a crystalline ester-based thermoplastic resin substrate.

The thin polarizing film of the above-mentioned Japanese Patent Application No. 2010-269002 and Japanese Patent Application No. 2010-263692 is a polarizing film of a continuous web made of a PVA-based resin in which a dichroic material is oriented, and is formed on an amorphous ester-based thermoplastic resin substrate. The laminate including the PVA-based resin layer formed into a film has a thickness of 10 µm or less by stretching in a two-stage stretching step consisting of aerial auxiliary stretching and stretching in boric acid water. Such a thin polarizing film, when the single transmittance is T and the polarization degree is P, P > -(10 ^0.929T-42.4 -1) × 100 (provided that T < 42.3), and P ≥ 99.9 (provided that T ≥ 42.3) It is preferable to have optical properties satisfying the condition of .

Specifically, the thin polarizing film is produced by high-temperature stretching in mid-air for a PVA-based resin layer formed on an amorphous ester-based thermoplastic resin substrate of a continuous web to produce a stretching intermediate product composed of an oriented PVA-based resin layer; , a step of producing a colored intermediate product comprising a PVA-based resin layer in which a dichroic substance (iodine or a mixture of iodine and an organic dye is preferable) is oriented by adsorption of the dichroic substance to the stretching intermediate; It can be manufactured by the manufacturing method of the thin polarizing film which includes the process of producing|generating the polarizing film with a thickness of 10 micrometers or less which consists of a PVA-type resin layer in which the dichroic substance was oriented by stretching the product in boric acid water.

In this manufacturing method, it is preferable that the total draw ratio of the PVA-type resin layer formed into a film on the amorphous ester-type thermoplastic resin base material by high temperature stretching in air and stretching in boric acid water becomes 5 times or more. The liquid temperature of the aqueous boric acid solution for extending|stretching in boric-acid water can be 60 degreeC or more. Before stretching the colored intermediate product in the boric acid aqueous solution, it is preferable to insolubilize the colored intermediate product. In that case, the colored intermediate product is immersed in an aqueous boric acid solution having a liquid temperature not exceeding 40°C. desirable. The amorphous ester-based thermoplastic resin substrate may be an amorphous polyethylene terephthalate containing a copolymerized polyethylene terephthalate copolymerized with isophthalic acid, a copolymerized polyethylene terephthalate obtained by copolymerizing cyclohexanedimethanol or another copolymerized polyethylene terephthalate, It is preferable that it consists of transparent resin, and the thickness can be made into 7 times or more of the thickness of the PVA-type resin layer to be formed into a film. Moreover, the draw ratio of air high temperature extending|stretching is preferably 3.5 times or less, and it is preferable that the extending|stretching temperature of air high temperature extending|stretching is more than the glass transition temperature of PVA-type resin, specifically, it is the range of 95 degreeC - 150 degreeC. When performing high-temperature stretching in air by free-end uniaxial stretching, it is preferable that the total draw ratio of the PVA-type resin layer formed into a film on the amorphous ester-type thermoplastic resin base material is 5 times or more and 7.5 times or less. Further, when performing high-temperature stretching in the air by fixed-end uniaxial stretching, it is preferable that the total draw ratio of the PVA-based resin layer formed on the amorphous ester-based thermoplastic resin substrate is 5 times or more and 8.5 times or less.

More specifically, the thin polarizing film can be manufactured by the following method.

The base material of the continuous web of isophthalic acid copolymerization polyethylene terephthalate (amorphous PET) which copolymerized 6 mol% of isophthalic acid is produced. The glass transition temperature of amorphous PET is 75°C. A laminate comprising a continuous web amorphous PET substrate and a polyvinyl alcohol (PVA) layer is produced as follows. For reference, the glass transition temperature of PVA is 80 °C.

An amorphous PET base material having a thickness of 200 µm and a PVA aqueous solution having a concentration of 1000 or more and a PVA powder having a saponification degree of 99% or more dissolved in water of 4 to 5% are prepared. Next, a PVA aqueous solution is coated on an amorphous PET substrate having a thickness of 200 μm, dried at a temperature of 50 to 60° C., and a laminate in which a PVA layer having a thickness of 7 μm is formed on the amorphous PET substrate is obtained.

A laminate including a PVA layer having a thickness of 7 μm is subjected to the following steps including two-stage stretching steps of air-assisted stretching and stretching in boric acid in water to prepare a 3 μm-thick thin high-performance polarizing film. By the air-assisted stretching process of the first stage, a laminate including a PVA layer having a thickness of 7 μm is integrally stretched with an amorphous PET substrate to produce a stretched laminate including a PVA layer having a thickness of 5 μm. Specifically, this stretched laminate is obtained by applying a laminate including a PVA layer having a thickness of 7 μm to a stretching device disposed in an oven set in an environment of a stretching temperature of 130 ° C. it will be extended By this stretching treatment, the PVA layer contained in the stretched laminate is changed to a PVA layer having a thickness of 5 μm in which the PVA molecules are oriented.

Next, a colored laminate in which iodine is adsorbed to a 5 µm-thick PVA layer in which PVA molecules are oriented is produced by a dyeing process. Specifically, this colored laminate is such that the single transmittance of the PVA layer constituting the high-functional polarizing film finally produced in a dyeing solution containing iodine and potassium iodide at a liquid temperature of 30° C. is 40 to 44%. Iodine is made to adsorb|suck to the PVA layer contained in a stretched laminated body by immersing for arbitrary time. This process WHEREIN: The dyeing liquid uses water as a solvent, iodine concentration shall be in the range of 0.12 to 0.30 weight%, and potassium iodide concentration shall be in the range of 0.7 to 2.1 weight%. The ratio of the concentration of iodine to potassium iodide is 1 to 7. For reference, potassium iodide is required to dissolve iodine in water. More specifically, by immersing the stretched laminate in a dyeing solution having an iodine concentration of 0.30% by weight and potassium iodide concentration of 2.1% by weight for 60 seconds, a colored laminate in which iodine is adsorbed to a PVA layer having a thickness of 5 μm in which PVA molecules are oriented. create

In addition, by the second step of stretching in boric acid in water, the colored laminate is further stretched integrally with the amorphous PET substrate to produce an optical film laminate including a PVA layer constituting a high-functional polarizing film having a thickness of 3 μm. . Specifically, this optical film laminate is free to apply the colored laminate to a stretching apparatus arranged in a processing apparatus set in an aqueous boric acid solution containing boric acid and potassium iodide in a liquid temperature range of 60 to 85°C, so that the stretching ratio is 3.3 times. It is stretched by only one axis. More specifically, the liquid temperature of the aqueous boric acid solution is 65°C. Further, the boric acid content is 4 parts by weight based on 100 parts by weight of water, and the potassium iodide content is 5 parts by weight based on 100 parts by weight of water. In this process, the colored laminated body which adjusted the iodine adsorption amount is first immersed in boric-acid aqueous solution for 5 to 10 second. Thereafter, the colored laminate is passed between a plurality of sets of rolls having different peripheral speeds, which is a stretching device disposed in the processing apparatus as it is, and the free end uniaxially so that the draw ratio is 3.3 times over 30 to 90 seconds. stretch By this stretching treatment, the PVA layer contained in the colored laminate is changed to a 3 µm thick PVA layer in which the adsorbed iodine is highly oriented in one direction as a polyiodine ion complex. This PVA layer constitutes a highly functional polarizing film of the optical film laminate.

In addition, although it is not an essential process for the production of the optical film laminate, the optical film laminate is taken out from the aqueous boric acid solution by the washing process, and boric acid adhered to the surface of the 3 μm thick PVA layer formed on the amorphous PET substrate is removed. It is preferable to wash|clean with potassium iodide aqueous solution. Then, the wash|cleaned optical film laminated body is dried by the drying process by 60 degreeC warm air. In addition, a washing|cleaning process is a process for eliminating external appearance defects, such as boric acid precipitation.

[Other processes]

The manufacturing method of the said thin polarizing film can include other processes other than the said process. As another process, an insolubilization process, a bridge|crosslinking process, a drying (controlling moisture content) process, etc. are mentioned, for example. Other steps can be performed at any appropriate timing.

The said insolubilization process is typically implemented by immersing a PVA-type resin layer in boric-acid aqueous solution. By performing an insolubilization process, water resistance can be provided to a PVA-type resin layer. The concentration of the aqueous boric acid solution is preferably 1 part by weight to 4 parts by weight with respect to 100 parts by weight of water. The liquid temperature of an insolubilization bath (boric acid aqueous solution) becomes like this. Preferably it is 20 degreeC - 50 degreeC. Preferably, an insolubilization process is performed after laminated body preparation, before a dyeing process or an underwater extending process.

The said crosslinking process is typically performed by immersing a PVA-type resin layer in boric-acid aqueous solution. By performing a crosslinking process, water resistance can be provided to a PVA-type resin layer. The concentration of the aqueous boric acid solution is preferably 1 part by weight to 4 parts by weight with respect to 100 parts by weight of water. Moreover, when implementing a crosslinking process after the said dyeing process, it is preferable to mix|blend an iodide further. By mix|blending an iodide, the elution of the iodine made to adsorb|suck to the PVA-type resin layer can be suppressed. The blending amount of the iodide is preferably 1 part by weight to 5 parts by weight with respect to 100 parts by weight of water. The specific example of an iodide is as above-mentioned. The liquid temperature of a crosslinking bath (boric acid aqueous solution) becomes like this. Preferably it is 20 degreeC - 50 degreeC. Preferably, the crosslinking step is carried out before the second stretching step in boric acid water. In a preferable embodiment, a dyeing process, a bridge|crosslinking process, and a 2nd boric-acid water extending|stretching process are implemented in this order.

≪Transparent protective film≫

The side-protected polarizing film (A) with a resin substrate prepared in the step (1) is a laminate having a polarizer 1 on one side of the resin substrate 3 (for example, the optical laminate obtained above) A transparent protective film 2 is laminated on the polarizer 1 . In addition, the polarizer 1 and the transparent protective film 2 are laminated|stacked through an adhesive bond layer normally. However, the adhesive layer is not shown in FIGS. 1 and 2 .

As a material constituting the transparent protective film, those having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, and the like are preferable. For example, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetyl cellulose and triacetyl cellulose, acrylic polymers such as polymethyl methacrylate, polystyrene or acrylonitrile styrene copolymer Styrenic polymers, such as (AS resin), polycarbonate-type polymer, etc. are mentioned. In addition, polyethylene, polypropylene, polyolefin having a cyclo- or norbornene structure, polyolefin-based polymer such as ethylene/propylene copolymer, vinyl chloride-based polymer, amide-based polymer such as nylon or aromatic polyamide, imide-based polymer, alcohol Phone-based polymer, polyethersulfone-based polymer, polyetheretherketone-based polymer, polyphenylenesulfide-based polymer, vinyl alcohol-based polymer, vinylidene chloride-based polymer, vinyl butyral-based polymer, allylate-based polymer, polyoxymethylene-based polymer, An epoxy-based polymer or a blend of the above-mentioned polymers can also be mentioned as examples of the polymer forming the above-mentioned transparent protective film. One or more types of arbitrary appropriate additives may be contained in a transparent protective film. As an additive, a ultraviolet absorber, antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent etc. are mentioned, for example. Content of the said thermoplastic resin in a transparent protective film becomes like this. Preferably it is 50-100 mass %, More preferably, it is 50-99 mass %, More preferably, it is 60-98 mass %, Especially preferably, it is 70-97 mass %. . When content of the said thermoplastic resin in a transparent protective film is 50 mass % or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has cannot fully be expressed.

The retardation film of the said resin film can be used for the polarizer protective film of this invention. As retardation film, what has a front retardation 40 nm or more and/or thickness direction retardation 80 nm or more of retardation is mentioned. The front retardation is normally in the range of 40 to 200 nm, and the thickness direction retardation is usually controlled in the range of 80 to 300 nm. When using retardation film as a polarizer protective film, since the said retardation film also functions as a polarizer protective film, thickness reduction can be aimed at.

As retardation film, the birefringent film formed by carrying out the uniaxial or biaxial stretching process of a thermoplastic resin film is mentioned. The temperature of the said extending|stretching, a draw ratio, etc. are set suitably according to retardation value, the material of a film, and thickness.

Although the thickness of the said transparent protective film can be determined suitably, it is generally about 1-500 micrometers from points, such as workability|workability, such as intensity|strength and handleability, and thin layer property. In particular, 1-300 micrometers is preferable, and 5-200 micrometers is more preferable.

Functional layers such as a hard coat layer, an antireflection layer, an antistick layer, a diffusion layer or an antiglare layer can be formed on the surface of the transparent protective film on which the polarizer is not adhered. In addition, the functional layers such as the hard coat layer, anti-reflection layer, anti-sticking layer, diffusion layer and anti-glare layer can be formed on the transparent protective film itself, and separately from the transparent protective film. may be

An adhesive agent is used for the adhesion process of a polarizer and a transparent protective film. Examples of the adhesive include an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, a vinyl-based latex-based adhesive, and an aqueous polyester. The said adhesive agent is normally used as an adhesive agent which consists of aqueous solution, and contains 0.5 to 60 weight% of solid content normally. In addition to the above, as an adhesive for a polarizer and a transparent protective film, an ultraviolet curing adhesive, an electron beam curing adhesive, etc. are mentioned. The adhesive for electron beam curing type polarizing films shows preferable adhesiveness with respect to the said various transparent protective films. Moreover, the adhesive agent used by this invention can be made to contain a metal compound filler.

The coating method of the adhesive agent is appropriately selected according to the viscosity of the adhesive agent or the target thickness. As an example of a coating system, a reverse coater, a gravure coater (direct, reverse or offset), a bar reverse coater, a roll coater, a die coater, a bar coater, a rod coater etc. are mentioned, for example. In addition, methods, such as a dipping method, can be used suitably for coating.

In addition, when using a water-based adhesive agent etc., it is preferable to apply the said adhesive agent so that the thickness of the adhesive bond layer finally formed may be set to 30-300 nm. The thickness of the said adhesive bond layer becomes like this. More preferably, it is 60-250 nm. On the other hand, when using a curable adhesive, it is preferable to implement so that the thickness of the said adhesive bond layer may be set to 0.1-200 micrometers. More preferably, it is 0.5-50 micrometers, More preferably, it is 0.5-10 micrometers.

Moreover, bonding of a polarizer and a transparent protective film WHEREIN: An easily bonding layer can be provided between a transparent protective film and an adhesive bond layer. The easily bonding layer can be formed of various resins having, for example, a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone-based skeleton, a polyamide skeleton, a polyimide skeleton, and a polyvinyl alcohol skeleton. . These polymer resins can be used individually by 1 type or in combination of 2 or more type. Moreover, you may add another additive to formation of an easily bonding layer. Specifically, you may further use stabilizers, such as a tackifier, a ultraviolet absorber, antioxidant, and a heat-resistant stabilizer.

An easily bonding layer is normally formed in advance in a transparent protective film, and the easily bonding layer side of the said transparent protective film and a polarizer are bonded together with an adhesive bond layer. Formation of an easily bonding layer is performed by coating and drying the formation material of an easily bonding layer on a transparent protective film by a well-known technique. The forming material of the easily bonding layer is a solution diluted to an appropriate density|concentration in consideration of the thickness after drying, smoothness of coating, etc., and is adjusted normally. The thickness after drying of an easily bonding layer becomes like this. Preferably it is 0.01-5 micrometers, More preferably, it is 0.02-2 micrometers, More preferably, it is 0.05-1 micrometer. In addition, although multiple layers of an easily bonding layer can be formed, also in this case, it is preferable to make the total thickness of an easily bonding layer become the said range.

<Step (2)>

At a process (2), the said resin base material 3 is peeled from the one-sided protection polarizing film (A) in which the said resin base material was formed.

<Step (3)>

At a process (3), by the said process (2), the surface of the polarizer 1 from which the resin base material 3 peeled from the single protective polarizing film (A) in which the said resin base material was formed is activated. 1 and 2 , the means for performing the activation process is shown as the activation means 4 .

Examples of the activation treatment include corona treatment, plasma treatment, excimer treatment, glow treatment, ozone treatment, and the like. Corona treatment can be performed, for example by the method of discharging in atmospheric pressure air with the corona treatment machine manufactured by Casga Electric. Plasma treatment can be performed, for example, by a method of discharging in atmospheric pressure air or in an inert gas atmosphere such as nitrogen or argon with a plasma discharge machine manufactured by Sekisui Chemical. The excimer treatment can be performed by irradiating an excimer lamp. The excimer lamp is a UV lamp with a wavelength of 180 nm or less in which Xe is enclosed. A glow treatment and an ozone treatment can also be implemented according to a conventional method. Among these, corona treatment, plasma treatment, or excimer treatment is preferable from the point of equipment cost and processing cost. In particular, corona treatment or plasma treatment is preferable from the viewpoint of easy control of the activation energy.

The said activation process is normally performed on conditions whose activation energy is 0.01-2 J/cm<2>. If the activation energy is less than 0.01 J/cm 2 , the activation treatment is not sufficient, the foreign matter on the surface of the polarizer cannot be sufficiently reduced, and the durability (adhesiveness, appearance) is insufficient. On the other hand, when the activation treatment energy exceeds 2 J/cm 2 , the damage imparted to the surface of the polarizer tends to become large, and there is a possibility that the optical properties (optical durability) cannot be satisfied. In addition, when the activation treatment energy exceeds 2 J/cm 2 , it is possible to reduce residual foreign substances accompanying peeling of the resin substrate on the surface of the polarizer, but there is a risk that foreign substances due to the above damage may occur, rather, durability ( adhesiveness, appearance) may become insufficient. It is preferable that the activation energy in the said activation process is 0.01-0.59 J/cm<2>, and it is preferable that it is 0.4-0.59 J/cm<2>.

Further, for example, when the activation treatment is corona treatment, the conditions of the activation amount (discharge amount: W/m 2 /min) are preferably 2 to 83 W/m 2 /min, and 2 to 42 W/min. m 2 /min is preferable, and further preferably 34 to 42 W/m 2 /min. Moreover, normally, it is preferable that it is about 1-5 mm, and, as for the gap between an electrode and a sample (polarizer), 1-2 mm is more preferable.

<Step (4)>

At a process (4), the adhesive layer 5 is laminated|stacked directly on the surface of the polarizer 1 to which the said process (3) was given, and the side protection polarizing film (B) with an adhesive layer is manufactured. In FIG. 1, FIG. 2, the separator 6 is provided in the adhesive layer 5 of the one-sided protection polarizing film B with an adhesive layer.

The said adhesive layer is formed from an adhesive. Various adhesives can be used as the adhesive, for example, rubber-based adhesive, acrylic adhesive, silicone-based adhesive, urethane-based adhesive, vinyl alkyl ether-based adhesive, polyvinyl alcohol-based adhesive, polyvinylpyrrolidone-based adhesive, polyacrylamide-based adhesive , a cellulose pressure-sensitive adhesive, and the like. The adhesive base polymer is selected according to the type of the adhesive.

Among the said adhesives, it is excellent in optical transparency, it shows suitable wettability, cohesiveness, and adhesive adhesive properties, and an acrylic adhesive is used preferably from the point which is excellent in weather resistance, heat resistance, etc. An acrylic adhesive contains a (meth)acrylic-type polymer as a base polymer. A (meth)acrylic polymer contains alkyl (meth)acrylate as a main component as a monomer unit normally. In addition, (meth)acrylate refers to an acrylate and/or a methacrylate, and has the same meaning as (meth) in this invention.

As the alkyl (meth)acrylate constituting the main skeleton of the (meth)acrylic polymer, a linear or branched alkyl group having 1 to 18 carbon atoms can be exemplified. For example, examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, an amyl group, a hexyl group, a cyclohexyl group, a heptyl group, a 2-ethylhexyl group, an isooctyl group, a no nyl group, decyl group, isodecyl group, dodecyl group, isomyristyl group, lauryl group, tridecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, etc. can be illustrated. These can be used individually or in combination. It is preferable that the average carbon number of these alkyl groups is 3-9.

In addition, in terms of adhesive properties, durability, adjustment of retardation, adjustment of refractive index, etc., alkyl (meth) acrylate containing an aromatic ring such as phenoxyethyl (meth) acrylate or benzyl (meth) acrylate can be used. have. The alkyl (meth) acrylate containing an aromatic ring can be used by mixing the polymer obtained by polymerization of this with the (meth) acrylic polymer exemplified above, but from the viewpoint of transparency, the alkyl (meth) acrylate containing an aromatic ring is , It is preferable to use it by copolymerization with the alkyl (meth)acrylate.

The ratio of the alkyl (meth)acrylate containing the aromatic ring in the (meth)acrylic polymer is 50% by weight or less in the weight ratio of all constituent monomers (100% by weight) of the (meth)acrylic polymer. may contain Moreover, 1 to 35 weight% is preferable, and, as for the content rate of the alkyl (meth)acrylate containing an aromatic ring, 1 to 20 weight% is preferable, 7 to 18 weight% is more preferable, Furthermore, 10 to 16 weight% is preferable. is preferable

In the (meth)acrylic polymer, one or more copolymerized monomers having a polymerizable functional group having an unsaturated double bond such as a (meth)acryloyl group or a vinyl group, for the purpose of improving adhesiveness and heat resistance, are introduced by copolymerization. can do. As a specific example of such a copolymerization monomer, For example, (meth)acrylic acid 2-hydroxyethyl, (meth)acrylic acid 3-hydroxypropyl, (meth)acrylic acid 4-hydroxybutyl, (meth)acrylic acid 6-hydroxy Hydroxyhexyl, (meth)acrylic acid 8-hydroxyoctyl, (meth)acrylic acid 10-hydroxydecyl, (meth)acrylic acid 12-hydroxylauryl or (4-hydroxymethylcyclohexyl)-methyl acrylate a hydroxyl group-containing monomer; carboxyl group-containing monomers such as (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid; acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adduct of acrylic acid; Containing sulfonic acid groups such as styrenesulfonic acid, allylsulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamidepropanesulfonic acid, sulfopropyl (meth)acrylate, and (meth)acryloyloxynaphthalenesulfonic acid monomer; Phosphoric acid group containing monomers, such as 2-hydroxyethyl acryloyl phosphate, etc. are mentioned.

In addition, (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N-butyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methylolpropane (meth)acrylamide, etc. (N-substituted) amide-based monomers; (meth)acrylic acid alkylaminoalkyl monomers such as (meth)acrylic acid aminoethyl, (meth)acrylic acid N,N-dimethylaminoethyl, and (meth)acrylic acid t-butylaminoethyl; (meth)acrylate alkoxyalkyl monomers such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate; N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyl-8-oxyoctamethylenesuccinimide, N -Succinimide-type monomers, such as acryloyl morpholine; Maleimide-type monomers, such as N-cyclohexyl maleimide, N-isopropyl maleimide, N-lauryl maleimide, and N-phenyl maleimide; N-methylitaconimide, N-ethyl itaconimide, N-butyl itaconimide, N-octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl itaconimide Itaconimide type monomers, such as mide|mid and N-lauryl itaconimide, etc. are mentioned as a monomer example for the modification objective.

Further, as a modifying monomer, vinyl acetate, vinyl propionate, N-vinylpyrrolidone, methylvinylpyrrolidone, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinylpyrrole, vinylimidazole vinyl-based monomers such as vinyloxazole, vinylmorpholine, N-vinylcarboxylic acid amides, styrene, α-methylstyrene, and N-vinylcaprolactam; cyanoacrylate-based monomers such as acrylonitrile and methacrylonitrile; Epoxy group-containing acrylic monomers, such as (meth)acrylic-acid glycidyl; glycol-based acrylic ester monomers such as (meth)acrylic acid polyethylene glycol, (meth)acrylic acid polypropylene glycol, (meth)acrylic acid methoxyethylene glycol, and (meth)acrylic acid methoxypolypropylene glycol; Acrylic acid ester-type monomers, such as (meth)acrylic-acid tetrahydrofurfuryl, fluorine (meth)acrylate, silicone (meth)acrylate, and 2-methoxyethyl acrylate, etc. can also be used. Moreover, isoprene, butadiene, isobutylene, vinyl ether, etc. are mentioned.

Moreover, as a monomer which can be copolymerized other than the above, the silane-type monomer containing a silicon atom, etc. are mentioned. Examples of the silane-based monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxide Siltriethoxysilane, 10-acryloyloxydecyltriethoxysilane, etc. are mentioned.

In addition, as a copolymerization monomer, tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1, 6- hexanediol di(meth)acrylate, bisphenol A diglycidyl ether di(meth) ) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta ( (meth)acryloyl groups such as esters of (meth)acrylic acid and polyhydric alcohols such as meth)acrylate, dipentaerythritol hexa(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate, A polyfunctional monomer having two or more unsaturated double bonds such as a vinyl group, or a (meth)acryloyl group and two unsaturated double bonds such as a vinyl group as the same functional group as the monomer component in the skeleton such as polyester, epoxy, urethane Polyester (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, etc. added above can also be used.

The (meth)acrylic polymer has an alkyl (meth)acrylate as a main component in the weight ratio of the total constituent monomers, and the ratio of the copolymerized monomer in the (meth)acrylic polymer is not particularly limited, but the ratio of the copolymerized monomers Silver is preferably about 0 to 20%, about 0.1 to 15%, and more preferably about 0.1 to 10% by weight of the total constituent monomers.

Among these copolymerization monomers, a hydroxyl group-containing monomer is preferably used from the viewpoint of adhesiveness and durability. Since the hydroxyl group-containing monomer is rich in reactivity with an intermolecular crosslinking agent, it is preferably used for the improvement of the cohesiveness and heat resistance of the adhesive layer obtained. A hydroxyl-group containing monomer is preferable at the point of rework property. When it contains a hydroxyl-group containing monomer as a copolymerization monomer, 0.01 to 15 weight% is preferable, as for the ratio, 0.03 to 10 weight% is more preferable, Furthermore, 0.05 to 7 weight% is preferable.

A carboxyl group-containing monomer is preferable at the point which makes durability and rework property compatible. When it contains a carboxyl group containing monomer as a copolymerization monomer, as for the ratio, 0.05 to 10 weight% is preferable. It is preferable to make the ratio of a carboxyl group containing monomer into the said range in order to suppress that the foreign material which remains on the surface of a polarizer transfers to an adhesive layer with peeling of a resin base material. The ratio of the said carboxyl group-containing monomer is especially effective in the case of 4 weight% or less. 0.05 to 4 weight% is preferable, as for the ratio of a carboxyl group containing monomer, 0.1 to 3 weight% is more preferable, Furthermore, 0.2 to 2 weight% is preferable.

As for the (meth)acrylic-type polymer of this invention, the thing with a weight average molecular weight in the range of 500,000-3 million is used normally. When durability, especially heat resistance is considered, it is preferable to use the thing of 700,000-2.7 million as a weight average molecular weight. Moreover, it is preferable that it is 800,000-2.5 million. When the weight average molecular weight is smaller than 500,000, it is not preferable from the viewpoint of heat resistance. Moreover, when a weight average molecular weight becomes larger than 3 million, in order to adjust to the viscosity for apply|coating, a large amount of diluent solvent is required, and it is unpreferable from the point which cost rises. In addition, a weight average molecular weight means the value computed by polystyrene conversion by measuring by GPC (gel permeation chromatography).

For the production of such a (meth)acrylic polymer, known production methods such as solution polymerization, bulk polymerization, emulsion polymerization, and various radical polymerizations can be appropriately selected. Moreover, any of a random copolymer, a block copolymer, a graft copolymer, etc. may be sufficient as the (meth)acrylic-type polymer obtained.

In addition, in solution polymerization, ethyl acetate, toluene, etc. are used as a polymerization solvent, for example. As a specific example of solution polymerization, reaction is performed under inert gas stream, such as nitrogen, a polymerization initiator, and is normally performed under reaction conditions of about 5 to 30 hours at about 50-70 degreeC.

The polymerization initiator, chain transfer agent, emulsifier, etc. used for radical polymerization are not specifically limited, It can select suitably and can use it. In addition, the weight average molecular weight of a (meth)acrylic-type polymer is controllable by the usage-amount of a polymerization initiator and a chain transfer agent, and reaction conditions, and the usage-amount is adjusted suitably according to these types.

Examples of the polymerization initiator include 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-amidinopropane)dihydrochloride, 2,2'-azobis[2-( 5-methyl-2-imidazolin-2-yl)propane]dihydrochloride, 2,2'-azobis(2-methylpropionamidine)disulfate, 2,2'-azobis(N,N' azo initiators such as dimethylene isobutylamidine) and 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine]hydrate (manufactured by Wako Pure Chemical Industries, Ltd., VA-057); Persulfates such as potassium persulfate and ammonium persulfate; di(2-ethylhexyl)peroxydicarbonate; di(4-t-butylcyclohexyl)peroxydicarbonate; di-sec-butylperoxydicarbonate; Oxyneodecanoate, t-hexylperoxypivalate, t-butylperoxypivalate, dilauroyl peroxide, di-n-octanoyl peroxide, 1,1,3,3-tetramethylbutylperoxy -2-ethylhexanoate, di(4-methylbenzoyl) peroxide, dibenzoyl peroxide, t-butylperoxyisobutylate, 1,1-di(t-hexylperoxy)cyclohexane, t-butyl Peroxide-based initiators such as hydroperoxide and hydrogen peroxide, a combination of persulfate and sodium hydrogensulfite, a redox-based initiator that combines a peroxide and a reducing agent, such as a combination of peroxide and sodium ascorbate, etc., but are limited to these no.

Although the said polymerization initiator may be used independently and may mix and use 2 or more types, it is preferable that content as a whole is about 0.005-1 weight part with respect to 100 weight part of monomers, and about 0.02-0.5 weight part It is more preferable that

In addition, as the polymerization initiator, for example, using 2,2'-azobisisobutyronitrile to produce the (meth)acrylic polymer having the above weight average molecular weight, the amount of the polymerization initiator used is the total amount of the monomer component. It is preferable to set it as about 0.06-0.2 weight part with respect to 100 weight part of amounts, and it is preferable to set it as about 0.08-0.75 weight part.

Examples of the chain transfer agent include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, thioglucolic acid 2-ethylhexyl, 2,3-dimercapto- 1-propanol etc. are mentioned. Although a chain transfer agent may be used independently and may mix and use 2 or more types, content as a whole is about 0.1 weight part or less with respect to 100 weight part of total amounts of a monomer component.

In addition, as an emulsifier used in the case of emulsion polymerization, for example, sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzenesulfonate, polyoxyethylene alkyl ether ammonium sulfate, polyoxyethylene alkylphenyl ether sodium sulfate, etc. Nonionic emulsifiers, such as a thermal emulsifier, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene fatty acid ester, and a polyoxyethylene polyoxypropylene block polymer, etc. are mentioned. These emulsifiers may be used independently and may use 2 or more types together.

In addition, as a reactive emulsifier, a radically polymerizable functional group such as a propenyl group or an allyl ether group is introduced as an emulsifier, specifically, for example, Aquaron HS-10, HS-20, KH-10, BC-05, BC-10, BC-20 (above, all manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), Adecaria Soph SE10N (manufactured by Asahi Electric Corporation), and the like. Since the reactive emulsifier is blown into the polymer chain after polymerization, it has good water resistance and is preferred. As for the usage-amount of an emulsifier, 0.5-1 weight part is more preferable from 0.3-5 weight part, polymerization stability, and mechanical stability with respect to 100 weight part of total amounts of a monomer component.

Moreover, the adhesive of this invention can contain a crosslinking agent. As the crosslinking agent, an organic crosslinking agent or a polyfunctional metal chelate can be used. As an organic crosslinking agent, an isocyanate type crosslinking agent, a peroxide type crosslinking agent, an epoxy type crosslinking agent, an imine type crosslinking agent, etc. are mentioned. A polyfunctional metal chelate is one in which a polyvalent metal is covalently bonded or coordinated with an organic compound. Examples of the polyvalent metal atom include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, and the like. have. Examples of the atom in the organic compound to be covalently bonded or coordinated include an oxygen atom, and examples of the organic compound include alkylesters, alcohol compounds, carboxylic acid compounds, ether compounds, and ketone compounds.

As for the usage-amount of a crosslinking agent, 0.01-20 weight part is preferable with respect to 100 weight part of base polymers (for example, (meth)acrylic-type polymer), and 0.03-10 weight part is preferable. In addition, when the crosslinking agent is less than 0.01 parts by weight, the cohesive force of the pressure-sensitive adhesive tends to be insufficient, and there is a fear that foaming occurs during heating. easier to do

Moreover, the adhesive of this invention can contain a silane coupling agent. Durability can be improved by using a silane coupling agent. Specific examples of the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2-( Epoxy group-containing silane coupling agent such as 3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3- an amino group-containing silane coupling agent such as triethoxysilyl-N-(1,3-dimethylbutylidene)propylamine and N-phenyl-γ-aminopropyltrimethoxysilane; 3-acryloxypropyltrimethoxysilane; (meth)acryl group containing silane coupling agents, such as 3-methacryloxypropyl triethoxysilane, isocyanate group containing silane coupling agents, such as 3-isocyanate propyl triethoxysilane, etc. are mentioned.

The silane coupling agent may be used alone or in mixture of two or more, but the content as a whole is preferably 0.001 to 5 parts by weight of the silane coupling agent with respect to 100 parts by weight of the (meth)acrylic polymer, Furthermore, 0.01-1 weight part is preferable, 0.02-1 weight part is more preferable, 0.05-0.6 weight part is further more preferable. It is an amount which improves durability and maintains the adhesive force with respect to optical members, such as a liquid crystal cell, moderately.

Moreover, the adhesive composition of this invention may contain other well-known additives, For example, powders, such as an ionic compound, a coloring agent, a pigment, dye, surfactant, a plasticizer, a tackifier, a surface lubricant, a leveling agent. , softeners, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particulates, thin materials, etc. may be appropriately added depending on the intended use. Moreover, within a controllable range, you may employ|adopt the redox system which added the reducing agent.

As a method of forming the pressure-sensitive adhesive layer, for example, a method of transferring the pressure-sensitive adhesive to a polarizer after applying the pressure-sensitive adhesive to a peeling-treated separator or the like, drying and removing the polymerization solvent, etc. to form the pressure-sensitive adhesive layer, then transferring the pressure-sensitive adhesive to a polarizer It is produced by, for example, a method in which a pressure-sensitive adhesive layer is formed in a polarizer by applying, drying and removing a polymerization solvent or the like. In addition, in application|coating of an adhesive, you may newly add 1 or more types of solvents other than a polymerization solvent suitably.

As the separator subjected to the release treatment, a silicone release liner is preferably used. In the step of forming the pressure-sensitive adhesive layer by applying and drying the pressure-sensitive adhesive of the present invention on such a liner, as a method of drying the pressure-sensitive adhesive, an appropriate method may be employed depending on the purpose. Preferably, the method of heating and drying the said coating film is used. Heat drying temperature becomes like this. Preferably it is 40 degreeC - 200 degreeC, More preferably, it is 50 degreeC - 180 degreeC, Especially preferably, it is 70 degreeC - 170 degreeC. By making heating temperature into said range, the adhesive which has the outstanding adhesive characteristic can be obtained.

As for the drying time, an appropriate time may be employed as appropriate. The drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.

Various methods are used as a formation method of an adhesive layer. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Methods, such as the extrusion coating method by this, are mentioned.

The thickness in particular of an adhesive layer is not restrict|limited, For example, it is about 1-100 micrometers. Preferably, it is 2-50 micrometers, More preferably, it is 2-40 micrometers, More preferably, it is 5-35 micrometers.

When the pressure-sensitive adhesive layer is exposed, the pressure-sensitive adhesive layer may be protected with a peeling-treated sheet (separator) until it is put to practical use.

As a constituent material of the separator, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate and polyester film, porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof Although suitable thin leaf bodies, such as these etc. are mentioned, A plastic film is used preferably from the point which is excellent in surface smoothness.

The plastic film is not particularly limited as long as it is a film capable of protecting the pressure-sensitive adhesive layer, and for example, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, A vinyl chloride copolymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, an ethylene-vinyl acetate copolymer film, etc. are mentioned.

The thickness of the said separator is 5-200 micrometers normally, Preferably it is about 5-100 micrometers. If necessary, the separator may be subjected to mold release and antifouling treatment with a silicone-based, fluorine-based, long-chain alkyl- or fatty acid amide-based mold release agent, silica powder, etc., or antistatic treatment such as coating type, kneading type, vapor deposition type, etc. . In particular, the peelability from the pressure-sensitive adhesive layer can be further improved by appropriately subjecting the surface of the separator to a release treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment.

Moreover, in the manufacturing method of the one-sided protection polarizing film with an adhesive layer of this invention, although it has the said process (1) - process (4), as shown in FIG. 2, a process (5) can be included.

<Step (5)>

In the step (5), between the step (2) and the step (3), on the surface of the polarizer 1 from which the resin substrate 3 was peeled by the step (2), a surface protection film (7) It relates to the process of peeling after bonding together. In FIG. 2, as a process (5)-1, the process of bonding together as a process (5)-2 of the surface protection film 7, the process of peeling after bonding is shown as a process (5)-2.

The surface protection film 7 is normally used in order to temporarily protect the surface of the polarizer 1 after a process (2) until it reaches a process (4). While the surface protection film 7 temporarily protects the surface of the polarizer 1, after peeling it from the surface of the polarizer 1, the adhesive etc. which concern on the surface protection film 7 of the polarizer 1 It is assumed that it remains as a foreign material on the surface. However, in the present invention, even when the surface of the polarizer 1 is temporarily protected by the surface protection film 7 by the step (5) in the present invention, the activation treatment is performed by the step (3), so the surface protection film The problem of the residual foreign material on the surface of the polarizer 1 resulting from the adhesive etc. which concern on (7) can also be eliminated.

<Surface protection film>

A surface protection film has a base film and an adhesive layer normally, and protects a polarizer through the said adhesive layer.

As the base film of the surface protection film, a film material having isotropy or close to isotropy is selected from the viewpoints of inspection properties, manageability, and the like. Examples of the film material include polyester-based resins such as polyethylene terephthalate film, cellulose-based resins, acetate-based resins, polyethersulfone-based resins, polycarbonate-based resins, polyamide-based resins, polyimide-based resins, and transparent polymers such as polyolefin resins and acrylic resins. Among these, polyester-type resin is preferable. A base film can also be used as a laminated body of 1 type, or 2 or more types of film materials, and also can use the stretched material of the said film. The thickness of a base film is generally 500 micrometers or less, Preferably it is 10-200 micrometers.

As the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer of the surface protection film, a pressure-sensitive adhesive containing a (meth)acrylic polymer, silicone-based polymer, polyester, polyurethane, polyamide, polyether, fluorine-based or rubber-based polymer as the base polymer is appropriately selected. Can be used. From viewpoints of transparency, weather resistance, heat resistance, etc., the acrylic adhesive which uses an acrylic polymer as a base polymer is preferable. The thickness (dry film thickness) of an adhesive layer is determined with the required adhesive force. Usually, it is about 1-100 micrometers, Preferably it is 5-50 micrometers.

In addition, a peeling process layer can be formed in the surface protection film with low adhesive materials, such as silicone treatment, a long-chain alkyl treatment, and a fluorine treatment, on the surface opposite to the surface on which the adhesive layer in the base film was formed. .

The single protective polarizing film with an adhesive layer of this invention can be used as an optical film laminated|stacked with another optical layer in practical use. Although there is no limitation in particular about the optical layer, For example, for the formation of liquid crystal display devices, such as a reflecting plate, a transflective plate, retardation plate (including a wave plate of 1/2 or 1/4 etc.), a visual compensation film, etc. One or two or more optical layers may be used in some cases. In particular, a reflective polarizing film or transflective polarizing film in which a reflective plate or a transflective reflective plate is further laminated on the single protective polarizing film having an adhesive layer of the present invention, an elliptically polarizing film or a circular polarizing film in which a retardation plate is further laminated on the polarizing film A polarizing film, a wide viewing angle polarizing film in which a visual compensation film is further laminated on a polarizing film, or a polarizing film in which a brightness improving film is further laminated on a polarizing film is preferable.

The optical film in which the optical layer is laminated on the side-protected polarizing film with the pressure-sensitive adhesive layer formed thereon can also be formed by sequentially and separately laminated in the manufacturing process of a liquid crystal display device, etc. There is an advantage in that it is possible to improve the manufacturing process of the liquid crystal display device and the like due to excellent quality stability and assembly work. Appropriate bonding means, such as an adhesive layer, can be used for lamination|stacking. Adhesion of said side protection polarizing film with an adhesive layer or another optical film WHEREIN: These optical axes can be made into an appropriate arrangement angle according to the retardation characteristic etc. made into the objective.

The side protection polarizing film or optical film with an adhesive layer of this invention can be used suitably for formation of various devices, such as a liquid crystal display device, etc. Formation of a liquid crystal display device can be performed according to the prior art. That is, a liquid crystal display device is generally formed by assembling a drive circuit by appropriately assembling components such as a liquid crystal cell and a side-protected polarizing film or an optical film in which an adhesive layer is formed, and, if necessary, a lighting system, etc., but in the present invention There is no limitation in particular except for the point using the one-sided protection polarizing film or optical film with the adhesive layer by this invention in this invention, Conventional can be followed. Also about a liquid crystal cell, the thing of arbitrary types, such as a TN type, an STN type, and (pi) type, can be used, for example.

An appropriate liquid crystal display device, such as a liquid crystal display device in which a side-protected polarizing film or an optical film in which an adhesive layer is formed on one side or both sides of a liquid crystal cell, or an illumination system is used, can be formed. In that case, the one-sided protection polarizing film or optical film with the adhesive layer by this invention can be provided in one side or both sides of a liquid crystal cell. When forming the one-sided protection polarizing film or optical film in which the adhesive layer was formed in both sides, they may be the same or different. In the formation of a liquid crystal display device, for example, one or two layers of appropriate components such as a diffusion plate, an anti-glare layer, an anti-reflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, and a backlight are placed at appropriate positions. More than one can be placed.

Example

Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by these Examples. In addition, both part and % in each example are based on weight. A protective polarizing film was produced.

<Optical film laminate: Preparation of thin polarizing film with resin substrate formed>

In order to produce a thin polarizing film, first, a laminate in which a 9 μm thick PVA layer is formed on an amorphous PET substrate is subjected to aerial assisted stretching at a stretching temperature of 130° C. to produce a stretched laminate, and then the stretched laminate A colored laminate is produced by dyeing, and the colored laminate is stretched integrally with the amorphous PET substrate so that the total draw ratio is 5.94 times by stretching in boric acid water at a stretching temperature of 65 ° C., followed by drying at 50 ° C. for 4 minutes. An optical film laminate comprising a 4 μm thick PVA layer was produced. By such two-stage stretching, the PVA molecules of the PVA layer formed on the amorphous PET substrate are highly oriented, and iodine adsorbed by dyeing constitutes a high-function polarizing film oriented in one direction as a polyiodine ion complex. An optical film laminate comprising a PVA layer having a thickness of 4 μm could be produced.

<Transparent protective film>

A (meth)acrylic resin film (manufactured by Toyo Steel Co., Ltd., product name: HX-40UC) having a thickness of 40 µm was used.

<Production of the pressure-sensitive adhesive layer with a separator>

On the surface of the polyethylene terephthalate film (separator film) treated with a silicone release agent, the following adhesive (solution) 1 or 2 was applied, and then dried in an air circulation constant temperature oven at 150 ° C. for 60 seconds, and a thickness of 20 µm The adhesive layer was formed and the adhesive layer with a separator was obtained.

≪Adhesive 1≫

<Preparation of acrylic polymer (A1)>

A monomer mixture containing 94.9 parts of butyl acrylate, 0.1 parts of 2-hydroxyethyl acrylate and 5 parts of acrylic acid was poured into a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube and a cooler. In addition, with respect to 100 parts of the monomer mixture (solid content), 0.1 parts of 2,2'-azobisisobutyronitrile as a polymerization initiator was injected together with ethyl acetate, and nitrogen gas was introduced while stirring slowly to replace nitrogen, and then the flask The polymerization reaction was performed for 7 hours while maintaining the liquid temperature in the vicinity of 60 degreeC. Then, ethyl acetate was added to the obtained reaction liquid, and the solution of the acrylic polymer (A1) of 2 million weight average molecular weights adjusted to 20% of solid content concentration was prepared.

<Preparation of adhesive composition>

With respect to 100 parts of the solid content of the acrylic polymer (A1) solution obtained above, 0.1 parts of trimethylolpropanxylylene diisocyanate (manufactured by Mitsui Chemicals: Takenate D110N), 0.3 parts of dibenzoyl peroxide, and γ-glycidoxypropyl 0.075 parts of methoxysilane (manufactured by Shin-Etsu Chemical Industries, Ltd.: KBM-403) was blended to prepare an acrylic pressure-sensitive adhesive solution.

≪Adhesive 2≫

<Preparation of acrylic polymer (A2)>

In Production Example 1, except that a monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate was used as the monomer mixture, in the same manner as in Production Example 1, an acrylic polymer having a weight average molecular weight of 1.6 million ( A2) solution was prepared.

<Preparation of adhesive composition>

With respect to 100 parts of the solid content of the acrylic polymer (A2) solution obtained above, 0.1 parts of trimethylolpropantolylene diisocyanate (manufactured by Nippon Polyurethane: Colonate L), 0.3 parts of dibenzoyl peroxide, and γ-glycidoxypropyl 0.075 parts of methoxysilane (manufactured by Shin-Etsu Chemical Industries, Ltd.: KBM-403) was blended to prepare an acrylic pressure-sensitive adhesive solution.

Example 1

(Process 1)

On the surface of the polarizing film (polarizer) in the optical film laminate (thin polarizing film provided with a resin substrate), the transparent protective film is pasted together while coating a polyvinyl alcohol-based adhesive, and partially protected polarized light with a resin substrate is formed The film was prepared.

(Process 2)

Next, the amorphous PET base material was peeled from the single protective polarizing film in which the resin base material was formed.

(Process 3)

Next, 0.5 J/cm 2 was applied to the surface (single side) of the polarizing film (polarizer) from which the amorphous PET substrate was peeled by the step (2) by a corona irradiator (manufactured by Kasuga Electric Corporation, CT-0212). Corona treatment was performed under the conditions.

(Process 4)

Then, on the surface of the polarizing film (polarizer) to which the said process (3) was performed, the adhesive layer (using the adhesive 1) formed in manufacture of the adhesive layer with a separator was bonded together, and the side protection polarizing film with an adhesive layer was formed. got

Examples 2 to 17, Comparative Examples 1 to 3

In Example 1, it carried out similarly to Example 1, except having changed the kind of the means of the activation process used in the process (3), or the cumulative irradiation amount, and the adhesive used by the process (4) as Table 1 was shown, and an adhesive layer This formed one-sided protection polarizing film was produced.

Moreover, in Examples 8 and 17, as shown in FIG. 2, between a process (2) and the said process (3), the process (5) of peeling after bonding a surface protection film together on the surface of a polarizer was formed. . As the surface protection film, Toretec 7832C manufactured by Toray Corporation was used.

In addition, "Plasma" shown in Table 1 used (Kasuga Electric Co., Ltd. make, APW-602f), and "Excimer" used (Ushio Electric Co., Ltd., SUS05). Comparative Example 3 is a case in which no activation treatment is performed.

[evaluation]

The following evaluation was performed about the one-sided protection polarizing film with an adhesive layer obtained by the Example and the comparative example. A result is shown in Table 1. As durability, "adhesive force" and "peelability" and "appearance" after a predetermined test were evaluated. As optical durability, "discoloration" and "hot water test" after a predetermined test were evaluated.

<Measurement of the amount of oligomers in the pressure-sensitive adhesive layer>

After leaving the single protective polarizing film (separator formation) with an adhesive layer to stand on 60 degreeC and conditions of 90 %RH for 500 hours, the separator was removed. About 0.025 g of a pressure-sensitive adhesive layer (sample) is taken from the side-protected polarizing film with an adhesive layer, 1 ml of chloroform is added, shaken at room temperature for 18 hours, 5 ml of acetonitrile is added, and extraction is performed, 3 hours shaken. The obtained solution was filtered through a 0.45 ml membrane filter to prepare a sample. The standard product of the PET oligomer of a trimer was adjusted to a fixed density|concentration, the calibration curve was created, and the amount of PET oligomer contained in an adhesive (ppm) was calculated|required using the calibration curve. The calibration curve was prepared by measuring by HPLC using a sample for which the PET oligomer concentration (ppm) was known.

HPLC instrument: 1200 series manufactured by Agilent Technologies

Measuring conditions

Column: ZORBAX SB-C18 manufactured by Agilent Technologies

Column temperature: 40℃

Column flow rate: 0.8 ml/min

Eluent composition: water/acetonitrile reversed-phase gradient conditions

Injection volume: 5 μl

Detector: PDA

Quantitative method: A standard sample of PET oligomer trimer was dissolved in chloroform and diluted with acetonitrile to adjust the sample to a constant concentration. A calibration curve was prepared from the HPLC area and the adjusted concentration, and the amount of PET oligomer in the sample was determined.

The amount of PET oligomers is preferably 50 ppm or less, more preferably 10 ppm or less, and further preferably 5 ppm or less.

<Adhesiveness>

What cut out the one-sided protection polarizing film (separator formation) with an adhesive layer to width 25mm x length about 100mm was made into the sample for evaluation. After removing a separator from a sample, after affixing an adhesive layer to a 0.5-mm-thick alkali-free-glass board (the Corning company make, 1737) by 2 kg roll reciprocation, and leaving it still at room temperature (23 degreeC) for 1 hour , the adhesive force (N/25 mm) was measured at a peeling angle of 90° and a peeling rate of 300 mm/min.

<Peeling and Appearance>

What cut out the one-sided protection polarizing film (separator formation) with an adhesive layer to 15-inch size was prepared as a sample for evaluation 2 sheets. After peeling a separator from a sample, it affixed on both surfaces of 0.5 mm-thick alkali free glass (the Corning company make, 1737) using a laminator so that each sample might become a cross nicol. Then, the autoclave process was carried out at 50 degreeC and 0.5 Mpa for 15 minutes, and the said sample was closely_contact|adhered to acryl-free glass completely. After processing for 500 hours in each atmosphere of 60 degreeC/90%RH (humidity condition) and 80 degreeC (heating condition) to the sample to which such a process was performed, peeling and external appearance were evaluated.

≪Peeling≫

The samples treated with the humidification condition or the heating condition were evaluated visually and based on the following criteria.

(double-circle): Peeling or foaming was not recognized at all.

(circle): Peeling or foaming of the grade which cannot be confirmed visually was confirmed.

(triangle|delta): Small peeling or foaming which can be confirmed visually was confirmed.

x: Clear peeling or foaming was confirmed.

≪Appearance≫

A polarizing film X in which the transparent protective film was adhered to only one side of a polarizer having a polarization degree of 99.98 was separately prepared. The polarizer side of the said polarizing film X and the side of the adhesive layer of the sample processed by humidification conditions or heating conditions were made to face, and the laminated body arrange|positioned by cross nicol was further prepared. Polarizing film X and the sample were arrange|positioned in the space of 300 mm or less. From the side of the polarizing film X of the said laminated body, 13000 cd/m<2> or more was irradiated, and the following reference|standard evaluated whether a luminescent point could be confirmed with foreign material (PET oligomer etc.) with a microscope (200 times).

(double-circle) : A bright point cannot be confirmed.

x: A bright spot was generated, and the display was affected.

<discoloration test>

What cut out the one-sided protection polarizing film (separator formation) with an adhesive layer to 151 mm x 85 mm was made into the sample for evaluation. After peeling a separator from a sample, it affixed on the 0.5-mm-thick alkali-free glass (made by Corning, 1737) using the laminator. Then, the autoclave process was carried out at 50 degreeC and 0.5 Mpa for 15 minutes, and the said sample was closely_contact|adhered to acryl-free glass completely. After processing the sample to which such a process was performed in the atmosphere of 60 degreeC/95 %RH for 500 hours, the amount of discoloration was measured.

The amount of discoloration (µm) was measured under a microscope. It is preferable that the amount of discoloration (micrometer) is 500 micrometers or less, further 50 micrometers or less, Furthermore, it is 10 micrometers or less.

<Hot water test>

What cut out the single protective polarizing film (separator formation) with an adhesive layer to 25 mm x 50 mm was made into the sample for evaluation. After peeling a separator from a sample, it affixed on the 0.5-mm-thick alkali-free glass (made by Corning, 1737) using the laminator. Then, the autoclave process was carried out at 50 degreeC and 0.5 Mpa for 15 minutes, and the said sample was closely_contact|adhered to acryl-free glass completely. The sample to which this process was performed was immersed in 60 degreeC warm water for 2 hours, and the hot water test was implemented. Next, the sample to which the hot water test was given was taken out, it arrange|positioned by cross nicol, it observed, and the area T (mm<2>) of the part which did not leak light was measured with a ruler. From the result, the polarizer retention rate (%) was computed with the following formula.

Polarizer retention (%) = (T/1250) × 100

It is preferable that polarizer retention (%) is 95 % or more, further 96 % or more, Furthermore, it is 98 % or more.

A; One-sided protective polarizing film with resin substrate formed
B; One-sided protective polarizing film with an adhesive layer
One ; polarizer
2 ; transparent protective film
3 ; resin substrate
4 ; means of activation
5 ; adhesive layer
6 ; separator
7 ; surface protection film

Claims (7)

A step (1) of preparing a side protection polarizing film with a resin substrate, which has a resin substrate and a polarizer formed on one side of the resin substrate, and a transparent protective film is laminated on the side of the polarizer;
Step (2) of peeling the resin base material from the single protective polarizing film on which the resin base material is formed;
A step (3) of performing an activation treatment on the surface of the polarizer from which the resin substrate has been peeled off by the step (2) on the condition that the cumulative irradiation amount of the activation energy is 0.01 to 2 J/cm 2 ;
It has a process (4) of laminating|stacking an adhesive layer directly on the surface of the polarizer to which the said process (3) was given, The manufacturing method of the side protection polarizing film with an adhesive layer characterized by the above-mentioned. The method of claim 1,
The activation treatment of the step (3) is a corona treatment, a plasma treatment, or an excimer treatment. 3. The method according to claim 1 or 2,
A method for producing a single protective polarizing film with a pressure-sensitive adhesive layer, characterized in that the thickness of the polarizer is 10 μm or less. 3. The method according to claim 1 or 2,
The polarizer is a polarizing film of a continuous web made of a polyvinyl alcohol-based resin in which a dichroic substance is oriented, and a laminate comprising a polyvinyl alcohol-based resin layer formed on a thermoplastic resin substrate is air-assisted stretching and stretching in boric acid water. It is obtained by extending|stretching by the two-stage extending|stretching process consisting of 3. The method according to claim 1 or 2,
The said resin base material is an ester-type resin base material, The manufacturing method of the side protection polarizing film with an adhesive layer characterized by the above-mentioned. 3. The method according to claim 1 or 2,
The said adhesive layer laminated|stacked in the said process (4) is an acrylic adhesive layer, The manufacturing method of the side protection polarizing film with an adhesive layer characterized by the above-mentioned. 3. The method according to claim 1 or 2,
Between the step (2) and the step (3),
It has a process (5) of peeling after bonding a surface protection film on the surface of the polarizer from which the resin base material peeled by the said process (2), The manufacturing method of the single-sided protection polarizing film with an adhesive layer characterized by the above-mentioned.

Images