JPH07116623A - Removal of dirt from antireflection coating - Google Patents

Abstract

PURPOSE:To efficiently remove dirt, such as fingerprints, from the surface of an antireflection coating without damage even if it has uneven surface. CONSTITUTION:A self-adhesive layer 3 is attached to such dirt as fingerprints 2 on the surface of an antireflection coating 1 under pressure and subsequently peeled with the dirt transferred to the self-adhesive layer to remove it. In this manner it is possible to remove the dirt that cannot be wipen off by chamois.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an oil film such as fingerprints attached to an antireflection layer provided on the surface of various visual devices such as LCDs and CRTs or optical members such as polarizing plates. .

[0002]

2. Description of the Related Art The surface of a display device such as an LCD or CRT in a TV, a personal computer, a touch panel or a viewing device, or an optical member such as a polarizing plate used for assembling an LCD is normally prevented from being hindered by reflected light. In order to do so, an antireflection layer is provided, and as the antireflection layer, a thin film made of a metal oxide such as silica or titania, a thin film made of a resin such as a fluororesin, or a superposed film thereof, or a visible light Various materials such as a fine uneven layer having a wavelength level have been proposed, but removal of an oil film adhered as a fingerprint or the like on any of the antireflection layers is a pending issue.

That is, since the antireflection layer is provided on the surface of the visual recognition device or the like as described above, an oil film such as fingerprints or saliva is likely to adhere to the antireflection layer. In the case of the antireflection layer, the adhesion of the oil and fat film causes a large visual obstruction compared with the case of a mere transparent plate. Especially for portable use consisting of TFT type LCD,
In a permanent TV, a video with a TV, a personal computer, etc., the effect of improving the brightness and contrast of the display portion by antireflection is great, and therefore the above-mentioned visual hindrance due to the adhesion of the oil and fat film is large.

Hitherto, as a method for removing the oil and fat film adhered to the antireflection layer, a wiping method using a fine cloth made of ultrafine fibers such as chamois, which is known as eyeglass wiping, has been regarded as the most preferable method. . However,
Even with such a wiping method, the oil film is spread thinly and the antireflection layer is damaged by strong rubbing, so that satisfactory removal is difficult. In particular, in the case of an antireflection layer having a concave and convex surface formed of a vapor-deposited film or the like, the oil film can hardly be removed even by such a wiping method, and there is a problem that it does not substantially function as a method for removing the oil film. there were.

[0005]

DISCLOSURE OF THE INVENTION According to the present invention, an oil film deposited on the surface of an antireflection layer as a fingerprint, saliva or the like is damaged by the antireflection layer even in the case of an antireflection layer having an uneven surface. The problem is to develop a method for efficient and efficient removal.

[0006]

According to the present invention, an adhesive layer is pressure-bonded to an oil film attached as a fingerprint or the like on the surface of an antireflection layer,
Then, the method is provided for removing the oil film of the antireflection layer, characterized in that the adhesive layer is peeled off while transferring the oil film.

[0007]

According to the above-mentioned method, the thin film of oil and fat film such as fingerprints and saliva which is not removed by wiping with chamois or the like can be efficiently removed from the antireflection layer without damaging it.

[0008]

EXAMPLE In the method of the present invention, an oil film deposited as fingerprints, saliva, etc. on the surface of the antireflection layer is transferred and removed under pressure bonding of the adhesive layer. The removal process is illustrated in FIG. Reference numeral 1 is an antireflection layer, 2 is an oil film, and 3 is an adhesive layer.
In addition, 4 is a support base material of the adhesive layer 3.

In the present invention, the pressure-sensitive adhesive layer used for removing the oil and fat film is formed in an appropriate pressure-sensitive adhesive member form such as a pressure-sensitive adhesive sheet having a support substrate provided with a pressure-sensitive adhesive layer. You may As for the supporting substrate,
Appropriate thin sheets made of plastic, metal foil, paper, cloth, laminates thereof or the like can be used. In addition, an appropriate form such as an adhesive sheet form in which a separator is temporarily attached to the adhesive surface thereof, a laminate form of an adhesive sheet using a supporting substrate having a back surface treated with a release agent, and a winding form formed by winding the adhesive sheet are used. It may have a morphology.

Further, as the adhesive member, as shown in FIGS. 2 and 3, for example, a roll-up type member 5 is attached to the handle roll 6 or is held by the grip cover 7 so that it can be handled in a roll type. It may be formed as an appropriate handling method. In the case of a supporting substrate made of plastic or the like, its thickness is 20 μ from the viewpoint of strength as an adhesive member.
The thickness is preferably m or more, and is preferably 500 μm or less, and more preferably 200 μm or less, from the viewpoint of deformation adhesion to fine irregularities and the like.

For forming the adhesive layer in the adhesive member, any adhesive substance such as an acrylic adhesive or a rubber adhesive can be used. It is preferable to use a lipophilic one having excellent adhesiveness to an oil and fat film in terms of removability. Further, from the viewpoint of workability and handleability, those having weak adhesion to the antireflection layer are preferable. The thickness of the adhesive layer is 10 μm or more, especially 15 to 15 from the viewpoint of deformability and filling of fine irregularities.
The thickness is preferably 500 μm.

The present invention is intended to remove an oil film made of fingerprints, saliva or the like attached to the surface of the antireflection layer, but the antireflection layer may be formed by an appropriate method. Examples thereof include SiO ₂ , ZrO ₂ , Al ₂ O ₃ , and Y formed by a vapor deposition method such as a vacuum vapor deposition method, a sputtering method, an ion plating method, a dipping method, a thin film coating method such as a spin coating method, or the like. ₂ O ₃ , TiO
Examples include a single layer film of metal oxide such as ₂ and magnesium fluoride, a fluororesin, etc., or a multilayer film in which these films are superposed.

Further, fine particles made of an inorganic substance such as the above metal oxide or an organic substance such as plastic and having an average particle diameter of 30 to 300 nm are fixed in a protruding state in the binder resin, or the above-mentioned layer is fixed on the layer. Anti-reflection layer with fine unevenness at the wavelength level on the surface, such as those provided with a single layer film or multilayer film, or those roughened by an appropriate method such as buff method, corona discharge method, ion etching method, etc. Can also be given. Further, for example, the thickness is 50 to 300 nm
In the antireflection layer of, for example, the average particle size is 100 to 600 nm
There is also mentioned a type in which appropriate fine particles having conductivity etc. are dispersed to make the surface uneven.

The antireflection layer for removing the oil and fat film is, for example, L
A display surface such as a glass plate or a plastic plate for a display device such as a CD or a CRT or a visual recognition device, an optical member such as a polarizing plate, particularly a protective film for a polarizing film made of a plastic film such as polyester or triacetyl cellulose, for spectacles It may be directly attached to the object to be processed such as lenses such as mirrors, mirrors such as anti-glare mirrors, instruments such as weighing scales, or reflection by attaching an antireflection layer to a support such as a plastic film An antireflection member may be formed and an antireflection layer may be adhered to the object to be processed as the antireflection member.

As the support for forming the antireflection member, for example, polyester resin, polyether sulfone resin, polycarbonate resin, polyamide resin, polyimide resin, polyolefin resin, acrylic resin, acetate resin are used. A film, sheet, or plate made of an appropriate polymer such as a resin is used, and in that case, a hard coat layer mixed with the above-mentioned fine particles is provided to thereby form an antireflection layer having an uneven surface. Therefore, in the present invention, such an antireflection layer or the like is also targeted, and therefore, the antireflection layer for removing the oil and fat film is not particularly limited.

According to the present invention, the removal of the oil film such as fingerprints and saliva adhering to the surface of the antireflection layer by the adhesive layer is carried out by pressing the adhesive layer onto the oil film without interposing bubbles and then peeling off the adhesive layer. Can be done by. As a result, the oil film adheres to the adhesive layer with a stronger adhesive force than the adhesive force with the antireflection layer, and thus the oil film is removed from the antireflection layer in a state of being transferred to the adhesive layer. Before removing it, you may wipe it off with chamois or the like. This method is particularly effective when a large amount of oil film is attached.

Example 1 A fingerprint was pressed and adhered to the surface of an antireflection layer made of a silica film having a thickness of 130 nm formed on the surface of a clear hard coat type polarizing plate by a sputtering method, and a polyester film having a thickness of 80 μm was attached to the surface. The weakly adhesive type acrylic adhesive layer having a thickness of 20 μm was attached under pressure, and then peeled off.

Example 2 A fingerprint was pressed and adhered to the surface of an antireflection layer made of a Y ₂ O ₃ film having a thickness of 125 nm formed on the surface of a polarizing plate subjected to anti-glare treatment by a sputtering method, and a thickness of 80 μm was applied to that portion.
Weakly-adhesive thickness 30 provided on m polyester film
A μm acrylic adhesive layer was pressure-bonded and then peeled off.

COMPARATIVE EXAMPLE 1 In place of the pressure-sensitive peeling method for the pressure-sensitive adhesive layer, a fingerprint was removed in the same manner as in Example 1 except that a chamois wipe method was used.

Comparative Example 2 The fingerprint removal was tried according to Example 2 except that a chamois method was used instead of the pressure-sensitive peeling method for the adhesive layer.

Evaluation Method The specular reflectance and the hue of the reflected light at the fingerprint pressing portion of the polarizing plate with an antireflection layer after the fingerprint removal treatment were measured, and the results are shown in the table. In any case, the specular reflectance in the initial state before pressing the fingerprint was 0.10%, the hue (based on NBS) was +5 in (a), and −10 in (b), and the pressed fingerprint was removed. In the state before the treatment, the specular reflectance is 1.
80%, the hue was +2 in (a) and -7 in (b).

From the table, in the case of the pressure-sensitive adhesive layer peeling method of the examples, the same specular reflectance and hue as in the initial state before pressing the fingerprint are exhibited even when the surface is roughened by anti-glare treatment, and the fingerprint is completely removed. It was found that the removal was achieved and there was no contamination due to adhesive residue on the adhesive layer.In the case of the chamois wipe method of the comparative example, fingerprints were inferior in specular reflectance and hue even when the surface of the clear hard coat type was smooth. It was found that the oil and fat film remained due to the above, and the anti-glare treated product did not achieve the removal of the fingerprint substantially even though the specular reflectance was slightly improved, and it was the same as the fingerprint pressed state before the treatment.

[0023]

According to the present invention, even in the case of an antireflection layer having an uneven surface, it adheres as a contaminant without damaging it, and an oil film such as fingerprints or saliva that cannot be wiped off with chamois or the like. Can be efficiently removed by a simple operation.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view of an embodiment.

FIG. 2 is an explanatory diagram illustrating an application method.

FIG. 3 is an explanatory diagram illustrating another application method.

[Explanation of symbols]

 1: Antireflection layer 2: Oil film 3: Adhesive layer 4: Support substrate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location A47L 25/00 C G09F 9/00 301 7610-5G // G02B 1/11 (72) Inventor Masada Nitto Denko Corporation 1-2-1, Shimohozumi, Ibaraki-shi, Osaka Prefecture (72) Inventor Tatsuki Nagatsuka 1-2-1, Shimohozumi, Ibaraki-shi, Osaka Prefecture Nitto Denko Corporation

Claims (2)

[Claims] 1. An oil and fat film for an antireflection layer, characterized in that an adhesive layer is pressure-bonded to an oil and fat film adhered as fingerprints or the like to the surface of the antireflection film, and then the adhesive layer is peeled off while transferring the oil and fat film. Removal method. 2. The method according to claim 1, wherein the antireflection layer comprises a thin film of a metal oxide or / and a resin and has irregularities on the surface.