KR20180089172A - Anti-Fingerprint Coating Composition and Image Display Device Using the Same - Google Patents

Abstract

Provided is a two-component anti-fingerprint coating composition containing: a first component composed of a solvent and a fluorine-containing silane compound; and a second component containing a reaction catalyst. Moreover, provided is an image display device using the same. According to the present invention, the anti-fingerprint coating composition is excellent in abrasion resistance and enables formation of a coating layer in which haze is reduced due to over-coating, thereby being effectively useful for forming anti-fingerprint coating layers for display cover windows.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an anti-fingerprint coating composition,

The present invention relates to a coating composition for preventing fingerprints and an image display device using the coating composition. More particularly, the present invention relates to a coating composition for preventing fingerprints which has excellent abrasion resistance and can reduce haze due to overcoating and a fingerprint- To an image display apparatus.

Since the display unit of various electronic devices such as a TV, a notebook computer and a mobile phone is exposed to an external pollution environment, the display unit can be easily contaminated by contaminants including oil, fingerprints and various foreign substances, Or the appearance quality of the electronic device is likely to deteriorate.

Accordingly, measures have been taken to prevent the fingerprint from adhering to the display surface by forming a coating layer on the display portion. Typically, a water-repellent or oil-repellent coating layer is formed. The coating layer has high contact angle with respect to moisture and oil, so that even if adherence of lipid to the display portion is possible, the coating layer can be easily removed.

Such a water-repellent and oil repellent coating layer is typically formed by a vacuum evaporation method or a wet coating method such as immersion, printing, or spraying.

In the case of the vacuum deposition method, a coating layer having a good contact angle can be formed. However, the equipment used for deposition is expensive, and it is not applicable to a glass of a ledge in which each unit cell is formed in a large- (See Korean Patent No. 1,242,591).

In the case of the wet coating method, the coating layer can be formed under easier process conditions without requiring expensive equipment such as vacuum vapor deposition equipment. However, when the coating is insufficient, the abrasion resistance is lowered, and when over coating is performed, There is a problem that residual molecules remain on the coating surface and haze occurs.

Accordingly, there is a demand for development of a coating composition for preventing fingerprints that can improve wear resistance and reduce haze by overcoating in a wet coating system.

Korea Patent No. 1,242,591

It is an object of the present invention to provide a coating composition for preventing fingerprints that is excellent in wear resistance and capable of reducing haze due to overcoating.

Another object of the present invention is to provide an anti-fingerprint coating layer formed using the anti-fingerprint coating composition.

It is still another object of the present invention to provide a cover window for a display comprising the fingerprint protection coating layer.

It is still another object of the present invention to provide a wet-type fingerprint-proof coating method using the above-mentioned anti-fingerprint coating composition.

On the other hand, the present invention relates to a fluorine-containing silane compound and a first component comprising a solvent; And a second component comprising a reaction catalyst.

In one embodiment of the present invention, the anti-fingerprint coating composition may further comprise an aminosilane compound.

In one embodiment of the present invention, the reaction catalyst may be at least one selected from the group consisting of an amine catalyst and an isocyanate catalyst.

In one embodiment of the present invention, the reaction catalyst may be at least one selected from the group consisting of benzyldimethylamine (BDMA) and isophorone diisocyanate (IPDI).

On the other hand, the present invention provides an anti-fingerprint coating layer formed using the anti-fingerprint coating composition.

On the other hand, the present invention provides a cover window for a display comprising the anti-fingerprint coating layer.

On the other hand, the present invention provides an optical laminate including the cover window for the display, and a polarizing plate and a touch sensor stacked on one surface of the cover window.

On the other hand, the present invention provides a wet-type anti-fingerprint coating method using the anti-fingerprint coating composition.

The coating composition for anti-fingerprinting according to the present invention can form a coating layer having excellent abrasion resistance and reduced haze due to overcoating, and can be effectively used for forming a fingerprint-preventing coating layer of a cover window for a display.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the results of measurement of wear resistance of a fingerprint-preventing coating layer by a coating composition for preventing fingerprints according to Examples 1 to 6 and Comparative Example 1 of the present invention. FIG.
2 is a graph showing haze measurement results of the anti-fingerprint coating layer by the anti-fingerprint coating composition according to Examples 1 to 6 and Comparative Example 1 of the present invention.

Hereinafter, the present invention will be described in more detail.

One embodiment of the present invention relates to a fluorine-containing silane compound comprising a first component comprising a fluorine-containing silane compound and a solvent; And a second component comprising a reaction catalyst.

The coating composition for anti-fingerprinting according to one embodiment of the present invention is a binary agent consisting of a first component and a second component, and the second component can be mixed with the first component immediately before coating.

The first component includes a fluorine-containing silane compound and a solvent as an anti-fingerprinting agent.

In one embodiment of the present invention, the fluorine-containing silane compound is a compound that contains fluorine atoms in the molecule and can exhibit water repellent and / or oil repellent surface properties.

The fluorine-containing silane compound can be used without limitation as the fluorine-containing silane compound which can exhibit ordinary water- and / or oil-repellent surface properties. For example, examples of the fluorine-containing silane compound include methyltrifluorosilane, tetrafluorosilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxy Silane, tridecafluorooctyltrimethoxysilane and tridecafluorooctyltriethoxysilane can be used alone or in combination.

The fluorine-containing silane compound may be contained in an amount of 0.1 to 1.0% by weight based on 100% by weight of the entire coating composition for preventing fingerprints. If the amount of the fluorine-containing silane compound is less than 0.1% by weight, the initial contact angle may be lowered. If the fluorine-containing silane compound is contained in an amount exceeding 1.0% by weight, spots may occur.

In one embodiment of the present invention, the solvent serves to disperse and / or dissolve the fluorine-containing silane compound to smooth the coating.

The above-mentioned solvent may be used without limitation as long as it is used in the technical field. Specifically, the solvent may be at least one selected from the group consisting of alcohols such as methanol, ethanol, propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol, t-butyl alcohol and diacetone alcohol, ethylene glycol monomethyl ether, Glycol ethers such as ethylene glycol monoethyl ether, propylene glycol monomethyl ether and propylene glycol monoethyl ether, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and acetylacetone, ethyl acetate, butyl acetate and ethyl acetoacetate Xylene, toluene, 7H-perfluoro-1-heptanal, methylhydrazine, and the like. These may be used alone or in combination of two or more.

The solvent may be contained in an amount of 90 to 99.7% by weight based on 100% by weight of the total of the anti-fingerprint coating composition. If the solvent is contained in an amount of less than 90% by weight, the stability of the coating composition for preventing fingerprint may be lowered or the initial contact angle may be lowered. If the solvent is contained in an amount exceeding 99.7% by weight, abrasion resistance may be deteriorated.

In one embodiment of the present invention, the first component may further comprise an aminosilane compound.

In one embodiment of the present invention, the aminosilane compound serves to help the fluorine-containing silane compound adhere to the substrate.

Examples of the aminosilane compound include aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropylmethyldiethoxysilane, aminoethylaminopropyltrimethoxysilane, aminoethylaminopropyltriethoxysilane, and the like. They can be used alone or in combination.

The aminosilane compound may be contained in an amount of 0.1 to 1.0% by weight based on 100% by weight of the total of the anti-fingerprint coating composition. When the aminosilane compound is contained in an amount less than 0.1% by weight, abrasion resistance may be deteriorated, and if it is contained in an amount exceeding 1.0% by weight, staining may occur.

In one embodiment of the present invention, the reaction catalyst promotes the reaction of the fluorine-containing silane compound to reduce the residual unreacted fluorine-containing silane compound by overcoating, thereby reducing the haze.

The reaction catalyst may be at least one member selected from the group consisting of an amine catalyst and an isocyanate catalyst.

Specifically, benzyldimethylamine, triethylamine,? -Methylbenzyldimethylamine, and the like can be used as the amine catalyst.

Examples of the isocyanate catalyst include isophorone diisocyanate, tolylene diisocyanate, xylene diisocyanate, 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, tetra Diisocyanate compounds such as methyl xylene diisocyanate and naphthalene diisocyanate; An adduct obtained by reacting 3 moles of a diisocyanate compound with 1 mole of a polyhydric alcohol compound such as trimethylolpropane, an isocyanurate compound in which 3 moles of a diisocyanate compound is self-condensed, a diisocyanate obtained from 2 moles of 3 moles of a diisocyanate compound And multifunctional isocyanate compounds containing three functional groups such as burette, triphenylmethane triisocyanate and methylene bistriisocyanate in which the remaining one mole of diisocyanate is condensed in urea.

The reaction catalyst is used in an amount of 0.05 to 1.0 By weight, preferably 0.2 to 0.5% by weight. When the reaction catalyst is contained in an amount of less than 0.05 wt%, the haze may increase and the abrasion resistance may be deteriorated. If the reaction catalyst is contained in an amount exceeding 1.0 wt%, the initial contact angle may be lowered.

The coating composition for preventing fingerprints according to an embodiment of the present invention may further include additives such as a crosslinking agent, a slipping agent, a binder, and the like, and the additives may be used in combination with the first component and / or the second component.

One embodiment of the present invention relates to an anti-fingerprint coating layer formed using the aforementioned anti-fingerprint coating composition.

The anti-fingerprint coating layer may be prepared by applying the anti-fingerprint coating composition onto a substrate and curing the coating.

The substrate is preferably glass, metal, ceramic or plastic, and if the substrate is transparent, it can be applied to optical applications.

The plastic is specifically a polycarbonate resin; Polyalkylene terephthalate resins such as polyethylene terephthalate (PET); Cellulose resins such as diacetyl cellulose, acetate butyrate cellulose and triacetyl cellulose; Acrylic resin; Polystyrene type resin; Polyimide resin; Polyester resin; Polyethersulfone resin; Liquid crystalline resins such as polyarylate; Polyurethane resin; Polysulfone resin; Polyetherketone resins; A polyolefin resin such as trimethylpentene and polyvinylnorbornene, and a high-refractive-index resin containing sulfur. It is preferably applied to a transparent substrate which requires antifouling properties such as polycarbonate resin, polyalkylene terephthalate resin such as PET, triacetyl cellulose resin and the like.

When the substrate is an organic substrate such as plastic, the anti-fingerprint coating layer may be bonded onto the substrate by a primer layer.

The primer layer may be formed by subjecting the substrate to a plasma treatment and then reacting a compound having an isocyanate group and an alkoxysilane group, specifically, an adduct of an isocyanate compound and an aminosilane compound. For example, the adduct may be an adduct of isophorone diisocyanate and (3-aminopropyl) trimethoxysilane.

The coating composition for preventing fingerprints according to an embodiment of the present invention can be formed by appropriately using known methods such as a spray coating method, an ink jet coating method, a dipping method, a spin coating method, a flow coating method, a roll coating method, A coating process is possible.

After the above anti-fingerprint coating composition is applied to the substrate, it is cured by drying at a temperature of 80 to 150 DEG C for 10 to 60 minutes.

At this time, the thickness of the anti-fingerprint coating layer may be specifically 8 to 20 nm. When the thickness of the coating layer is within the above range, excellent fingerprint prevention effect can be obtained.

One embodiment of the present invention relates to a cover window for a display comprising the above-described fingerprint protection coating layer.

One embodiment of the present invention relates to an optical laminate including the above-described cover window for a display, and a polarizing plate and a touch sensor stacked on one surface of the cover window. Such an optical laminate can be used in an image display apparatus.

In one embodiment of the present invention, the polarizing plate may include a polarizer and, if necessary, a protective film laminated on at least one side of the polarizer.

The touch sensor may be a conventional touch sensor, for example, a film touch sensor having a film shape.

An embodiment of the present invention relates to a wet-type anti-fingerprint coating method using the aforementioned anti-fingerprint coating composition.

Specifically, the wet-type anti-fingerprint coating method comprises: (i) mixing a first component comprising a fluorine-containing silane compound and a solvent with a second component comprising a reaction catalyst to obtain a coating composition for anti-fingerprinting; (ii) applying the anti-fingerprint coating composition to a substrate to obtain a coated layer; And (iii) curing the coating layer.

When the reaction catalyst is mixed in the coating composition for preventing fingerprints for a long time, the coating composition for preventing fingerprints can be gelled. Therefore, in the step (i), the mixing of the first component and the second component is preferably performed immediately before application.

In the step (ii), the application may be performed by any conventional coating method used for the wet coating. For example, a spray coating method, an ink jet coating method, a dipping method, a spin coating method, a flow coating method, Screen printing method.

In the step (iii), the curing may be performed by drying at a temperature of 80 to 150 DEG C for 10 to 60 minutes.

Hereinafter, the present invention will be described more specifically with reference to Examples, Comparative Examples and Experimental Examples. It should be apparent to those skilled in the art that these examples, comparative examples and experimental examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

Example  1 to 6 and Comparative Example  1: Preparation of a coating composition for preventing fingerprints

Each component was mixed with the composition shown in Table 1 below (unit: parts by weight) to prepare a coating composition for preventing fingerprints.

Example Comparative Example One 2 3 4 5 6 One Fluorine-containing silane compound Methyltrifluorosilane 0.3 0.3 0.3 0.3 0.3 0.3 0.3 Aminosilane compound 1-propanamine, 3-triethoxysilyl 0.2 0.2 0.2 0.2 0.2 0.2 0.2 solvent 7H-perfluoro-1-heptane 95.48 95.44 95.20 95.00 94.50 94.30 95.50 Methyl hydrazine 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Methyl ethyl ketone 3.0 3.0 3.0 3.0 3.0 3.0 3.0 reaction
catalyst Benzyldimethylamine 0.01 0.03 0.15 0.25 0.50 0.60 - Isophorone diisocyanate 0.01 0.03 0.15 0.25 0.50 0.60 -

Experimental Example  One:

Each of the coating compositions for preventing fingerprints prepared in Examples and Comparative Examples was coated on glass at 3 cc / minute to form a fingerprint-preventing coating layer.

The physical properties of the prepared anti-fingerprint coating layer were measured by the following method.

(1) Eraser abrasion resistance

The eraser abrasion resistance of the anti-fingerprint coating layer was measured using a Minoan test stick eraser. Eraser pressing load 1.0 kg / reciprocating speed 40 rpm / mileage distance 20 mm / round-trip abrasion number 3000 times Fingerprinting The abrasion resistance of the coating layer was measured, Respectively. The contact angle was measured using a portable contact angle meter PCA-1 (manufactured by KYOWA). At this time, 1.7 占 퐉 was dropped using the? / 2 method, and the measurement was performed after waiting for 1000 ms.

The results are shown in Fig.

(2) Hayes  Occur

The degree of haze of the anti-fingerprint coating layer was evaluated using a haze meter HRM-150 (Murakami Co.).

The results are shown in Fig.

As shown in FIGS. 1 and 2, the anti-fingerprint coating layer of the anti-fingerprint coating composition of Examples 1 to 6 according to the present invention has a contact angle after the wear of the eraser is lower than that of the anti-fingerprint coating layer of the anti- It was confirmed that the generation of haze was reduced even when it was high.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Do. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Accordingly, the actual scope of the invention is defined by the appended claims and their equivalents.

Claims (15)

A first component comprising a fluorine-containing silane compound and a solvent; And
And a second component comprising a reaction catalyst. The fluorine-containing silane compound according to claim 1, wherein the fluorine-containing silane compound is at least one selected from the group consisting of methyltrifluorosilane, tetrafluorosilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltri At least one selected from the group consisting of trimethylolpropane trimethoxysilane, trimethoxysilane, tridecafluorooctyltrimethoxysilane, and tridecafluorooctyltriethoxysilane. The anti-fingerprint coating composition of claim 1, wherein the first component further comprises an aminosilane compound. 4. The method of claim 3, wherein the aminosilane compound is selected from the group consisting of aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropylmethyldiethoxysilane, aminoethylaminopropyltrimethoxysilane, and aminoethylaminopropyltriethoxysilane At least one kind selected from the group consisting of: The anti-fingerprint coating composition according to claim 1, wherein the reaction catalyst is at least one selected from the group consisting of an amine catalyst and an isocyanate catalyst. 6. The anti-fingerprint coating composition according to claim 5, wherein the reaction catalyst is at least one selected from the group consisting of benzyldimethylamine (BDMA) and isophorone diisocyanate (IPDI). The method according to claim 1, wherein the reaction catalyst is used in an amount of 0.05 to 1.0 By weight based on the total weight of the coating composition. An anti-fingerprint coating layer formed using the anti-fingerprint coating composition according to any one of claims 1 to 7. The anti-fingerprint coating layer according to claim 8, wherein the anti-fingerprint coating layer is bonded onto the substrate by a primer layer. A cover window for a display comprising the anti-fingerprint coating layer of claim 8. An optical laminate comprising a cover window for a display according to claim 10, and a polarizing plate and a touch sensor stacked on one side of the cover window. (i) mixing a first component comprising a fluorine-containing silane compound and a solvent with a second component comprising a reaction catalyst to obtain a coating composition for anti-fingerprinting;
(ii) applying the anti-fingerprint coating composition to a substrate to obtain a coated layer; And
(iii) curing the coating layer. 13. The method of claim 12, wherein the mixing of the first component and the second component in step (i) is performed immediately prior to application. The method of claim 12, wherein the coating is performed by a spray coating method, an ink jet coating method, a dipping method, a spin coating method, a flow coating method, a roll coating method, or a screen printing method in the step (ii). 13. The method of claim 12, wherein in step (iii), the curing is performed by drying at a temperature of 80 to 150 DEG C for 10 to 60 minutes.

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