JP2003049135A - Easy adhesion polyester film for ITO film - Google Patents

Abstract

(57) [abstract] (with correction) [PROBLEMS] ITO having excellent adhesion, transparency and slipperiness
Provide an easily adhesive polyester film for a membrane. An IT in which a coating layer provided on at least one side of a polyester film contains a component having a crosslinked structure.
An easily adhesive polyester film for an O film, wherein the coating layer is a polyester resin, one or more resins of an acrylic resin or a urethane resin, and the component having a crosslinked structure is composed of one or more of an epoxy compound, an oxazoline compound, a melamine compound, or an isocyanate compound. .

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an easy-adhesive film, and more specifically, an easy-adhesive coating film made of a specific composition is formed on at least one side of a polyester film for excellent adhesion, transparency, and The present invention relates to an easily adhesive polyester film for an ITO film (indium / tin / oxide film) having slipperiness.

[0002]

2. Description of the Related Art Polyester films, especially biaxially stretched films of polyethylene terephthalate and polyethylene naphthalate, have excellent mechanical properties, heat resistance and chemical resistance, so that they are magnetic tape, ferromagnetic thin film tape, photographic film, packaging. It has been widely used as a material for films for electronic parts, films for electronic parts, films for electrical insulation, films for laminating metal plates, films to be stuck on the surface of glass displays, films for protecting various members, and the like.

In recent years, various optical films have been widely used as members of liquid crystal display devices, and CRTs, LCDs, organic ELs,
Demand for display films such as PDPs is increasing. These require a film-shaped electrode and a circuit formed on the film, and an ITO film has recently been used. For example, since an ITO film for a touch panel is displaced by a finger or the like many times, very high adhesion is required for the base film. Furthermore, the environment in which the touch panel is used is poor in an automobile or the like, and moisture resistance and heat resistance are required for the base film. In many cases, a method using etching is used for forming a circuit using an ITO film, and the base film is required to have etching resistance.

Since the biaxially oriented polyester film has poor adhesion to the functional layers of the above-mentioned various films, an easy-adhesion layer made of polyester resin, acrylic resin, urethane resin or the like is generally formed on the surface of the polyester film. Stacking is proposed. However, in the case where the easily-adhesive layer made of these resins is formed, the adhesive strength may be insufficient or the etching resistance may be insufficient. On the other hand, since the ITO film base film is required to have transparency, it is usually necessary to reduce the amount of the internally added filler, and the films do not slip to each other, the handling property deteriorates, and the film does not slip easily during film forming or processing steps. There is a problem that the surface is easily scratched.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems of the prior art and to provide a polyester film having excellent adhesiveness with an ITO film, transparency and slipperiness. It is what

[0006]

As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by forming an easily adhesive coating film containing a crosslinked structure. The present invention has been completed.

That is, the present invention provides (1) an easily adhesive polyester film for an ITO film, wherein the coating layer provided on at least one surface of the polyester film contains a component having a crosslinked structure. .

In a preferred embodiment of the present invention, (2) the component having a crosslinked structure is formed from at least one selected from the group consisting of epoxy compounds, oxazoline compounds, melamine compounds, isocyanate compounds and coupling agents ( (1) or (3) The coating layer contains at least one polymer resin selected from the group consisting of polyester resin, acrylic resin and urethane resin as a component (1) or ( The easily-adhesive polyester film for ITO film according to 2), or (4) the polyester constituting the polyester film is mainly composed of polyethylene terephthalate or polyethylene-2,6-naphthalate (1) to (3) Item 3. Easy-adhesive polyester film for ITO film according to item Is Lum.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

In the present invention, the polyester constituting the polyester film is a linear saturated polyester synthesized from an aromatic dibasic acid or its ester-forming derivative and a diol or its ester-forming derivative.

Specific examples of such polyesters include polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate, poly (1,4-cyclohexylene dimethylene terephthalate), polyethylene-2,6-naphthalate, and the like. It may be a copolymer or a blend thereof with a small proportion of another resin. Of these polyesters,
Especially polyethylene terephthalate, polyethylene-2
6-naphthalate is preferable because it has a good balance of mechanical properties and optical properties.

These polyesters may optionally contain
Appropriate fillers can be included. As the filler, it is possible to use those conventionally known as a slipperiness-imparting agent for polyester films,
For example, calcium carbonate, calcium oxide, aluminum oxide, kaolin, silicon oxide, zinc oxide, carbon black, silicon carbide, tin oxide, crosslinked acrylic resin particles, crosslinked polystyrene resin particles, melamine resin particles, crosslinked silicone resin particles and the like. You can Further, a colorant, an antistatic agent, an antioxidant, an organic lubricant, a catalyst and the like can be appropriately added to the polyester.

The polyester film used in the present invention is
For example, the above polyester is melt extruded into a film,
An unstretched film is obtained by cooling and solidifying with a casting drum, and this unstretched film is stretched once or twice or more in the longitudinal direction at Tg to (Tg + 60) ° C. and the total magnification is 3 to 6 times.
Stretching to double, then stretching at Tg to (Tg + 60) ° C. in the width direction so as to have a magnification of 3 to 5 times, and further heat treatment at 180 to 230 ° C. for 1 to 60 seconds, and heat treatment. 0 in the width direction at a temperature 10 to 20 ° C lower than the temperature
It can be obtained by re-heat treatment while shrinking by -20%.

The thickness of the polyester film used in the present invention is preferably 10 to 300 μm in order to obtain the strength required when it is used as a support for a touch panel, a film-shaped circuit or the like in which an ITO film is used. It is particularly preferably 20 to 250 μm.

The coating layer in the present invention needs to contain a component having a crosslinked structure, and the component having this crosslinked structure (hereinafter sometimes abbreviated as "crosslinking component").
Is a component in which the cross-linking agents are bonded to each other or the cross-linking agent and the polymer resin are bonded.

A cross-linking agent is used to form the cross-linking component. Examples of the cross-linking agent include epoxy compounds, oxazoline compounds, melamine compounds, isocyanate compounds and coupling agents. In the present invention, these are used. One or more of these cross-linking agents can be used and can be exemplified as follows.

Examples of the epoxy compound include polyepoxy compounds, diepoxy compounds, monoepoxy compounds and glycidylamine compounds. Examples of the polyepoxy compounds include sorbitol, polyglycidyl ether, polyglycerol polyglycidyl ether and penta. Examples of the erythritol polyglycidyl ether, diglycerol polyglycidyl ether, triglycidyl tris (2-hydroxyethyl) isocyanate, glycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, and diepoxy compound include, for example, neopentyl glycol diglycidyl ether, 1, 6-hexanediol diglycidyl ether, resorcin diglycidyl ether, ethylene glycol diglycidyl ether As the polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, monoepoxy compound, for example, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, As the glycidylamine compound, N, N, N ′, N ′,-tetraglycidyl-m-xylylenediamine, 1,3-bis (N, N)
-Diglycidylamino) cyclohexane and the like can be mentioned.

The oxazoline compound in the present invention is preferably a polymer containing an oxazoline group. Such a polymer can be prepared by the addition-polymerizable oxazoline group-containing monomer alone or by polymerization with another monomer. Addition-polymerizable oxazoline group-containing monomers include 2-vinyl-2-oxazoline and 2-vinyl-4-methyl-2.
-Oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-
Isopropenyl-4-methyl-2-oxazoline, 2-
Examples thereof include isopropenyl-5-ethyl-2-oxazoline and the like, and one kind or a mixture of two or more kinds thereof can be used. Among these, 2-isopropenyl-2-oxazoline is industrially easily available and suitable. The other monomer is not limited as long as it is a monomer copolymerizable with the addition-polymerizable oxazoline group-containing monomer, and examples thereof include alkyl acrylate and alkyl methacrylate (wherein the alkyl group is a methyl group, an ethyl group, n-
(Meth) acrylic acid esters such as propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclohexyl group; acrylic acid, methacrylic acid, itaconic acid, maleic acid, Unsaturated carboxylic acids such as fumaric acid, crotonic acid, styrenesulfonic acid and salts thereof (sodium salt, potassium salt, ammonium salt, tertiary amine salt, etc.); acrylonitrile,
Unsaturated nitriles such as methacrylonitrile; acrylamide, methacrylamide, N-alkylacrylamide, N-alkylmethacrylamide, N, N-dialkylacrylamide, N, N-dialkylmethacrylate (as the alkyl group, methyl group, ethyl group , N-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclohexyl group) and the like; unsaturated vinyl amides such as vinyl acetate and vinyl propionate; Vinyl ethers such as methyl vinyl ether and ethyl vinyl ether; α-olefins such as ethylene and propylene; vinyl chloride,
Vinylidene chloride, halogen-containing α, β- such as vinyl fluoride
Unsaturated monomers; α, β-unsaturated aromatic monomers such as styrene and α-methylstyrene, and the like, and one or more of these monomers can be used.

As the melamine compound in the present invention,
A compound obtained by reacting a methylolmelamine derivative obtained by condensing melamine and formaldehyde with a lower alcohol such as methyl alcohol, ethyl alcohol or isopropyl alcohol and etherification, and a mixture thereof are preferable. As the methylolmelamine derivative, for example, monomethylolmelamine, dimethylolmelamine,
Trimethylol melamine, tetramethylol melamine,
Pentamethylol melamine, hexamethylol melamine, etc. can be mentioned.

Examples of the isocyanate compound in the present invention include tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate, metaxylylene diisocyanate, hexamethylene-1,6-diisocyanate, 1,6-diisocyanate hexane and tolylene diisocyanate. And hexanetriol adduct, tolylene diisocyanate and trimethylolpropane adduct, polyol modified diphenylmethane-4,4'-diisocyanate, carbodiimide modified diphenylmethane-4,4'-diisocyanate, isophorone diisocyanate, 1,5-naphthalenediisocyanate, 3,3
′ -Vitrylene-4,4 ′ diisocyanate, 3,3 ′
Examples thereof include dimethyldiphenylmethane-4,4'-diisocyanate and metaphenylene diisocyanate.

The coupling agent in the present invention is a compound represented by the general formula YRSiX ₃ , and examples thereof include a silane coupling agent. Here, Y is an organic functional group such as a vinyl group, an epoxy group, an amino group or a mercapto group, R is an alkylene group such as a methylene, ethylene or propylene group, X is a hydrolyzing group such as a methoxy group or an ethoxy group, and It is an alkyl group. It is particularly preferred that the Y moiety is an epoxy group. Specific preferred silane coupling agents include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane and the like. In addition, organometallic compounds containing a metal such as zirconium, titanium and aluminum are preferably classified into alkoxides, chelates and acylates. Specific examples thereof include zirconium tetraacetylacetonate, zirconium acetate, titanium acetylacetonate, triethanolamine titanate, and titanium lactate, but are not limited thereto.

These cross-linking agents are preferably water-soluble or water-dispersible from the viewpoint of environmental pollution and explosion proof. Also,
From the viewpoint of rust prevention of manufacturing equipment and generation of toxic gas when products are incinerated and discarded, those containing no halogen element are preferable.

The cross-linking structure of the easily adhesive coating layer of the present invention is preferably formed of a polymer resin in addition to the cross-linking agent, and further preferably one or more resins selected from polyester resin, acrylic resin and urethane resin. .

The polyester resin comprises the following polybasic acids or their ester-forming derivatives and polyols or their ester-forming derivatives. That is, the polybasic acid components include terephthalic acid, isophthalic acid, phthalic acid, phthalic anhydride, 2,6 naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, adipic acid, sebacic acid, trimellitic acid, and pyromellitic acid. , Dimer acid, 5
-Sodium sulfoisophthalic acid and the like. Two or more kinds of these acid components are used to synthesize a copolyester resin. Further, unsaturated carboxylic acids such as maleic acid, itaconic acid and p-hydroxybenzoic acid, which are unsaturated polybasic acid components, can be used in a small amount. Further, as the polyol component, ethylene glycol,
1,4-butanediol, diethylene glycol, dipropylene glycol, 1,6-hexanediol, 1,
4-cyclohexanedimethanol, xylene glycol, dimethylolpropane, poly (ethylene oxide)
Examples thereof include glycol and poly (tetramethylene oxide) glycol. In addition, examples thereof include, but are not limited to, these monomers. Two or more kinds of these monomers can be used for copolymerization.

The components of the acrylic resin include acrylic monomers as exemplified below. Examples of the acrylic monomer include alkyl acrylate and alkyl methacrylate (as the alkyl group, a methyl group, an ethyl group, n
-Propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclohexyl group, etc.); 2-hydroxyethyl acrylate,
Hydroxy-containing monomers such as 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate and 2-hydroxypropyl methacrylate; epoxy group-containing monomers such as glycidyl acrylate, glycidyl methacrylate and allyl glycidyl ether; acrylic acid,
Methacrylic acid, itaconic acid, maleic acid, fumaric acid,
Monomers containing carboxy groups such as crotonic acid, styrenesulfonic acid and salts thereof (sodium salt, potassium salt, ammonium salt, tertiary amine salt, etc.) or salts thereof; acrylamide, methacrylamide, N-alkylacrylamide, N- Alkyl methacrylamide, N,
N-dialkyl acrylamide, N, N-dialkyl methacrylate (as the alkyl group, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group,
Isobutyl group, t-butyl group, 2-ethylhexyl group,
Cyclohexyl group, etc.), N-alkoxyacrylamide, N-alkoxymethacrylamide, N, N-dialkoxyacrylamide, N, N-dialkoxymethacrylamide (as the alkoxy group, methoxy group, ethoxy group, butoxy group, isobutoxy group, etc. ), Acryloylmorpholine, N-methylolacrylamide, N-methylolmethacrylamide, N-phenylacrylamide, N-phenylmethacrylamide, or other amide group-containing monomers; maleic anhydride, itaconic anhydride, or other acid anhydride monomers; Vinyl isocyanate, allyl isocyanate, styrene, α-methylstyrene, vinyl methyl ether, vinyl ethyl ether, vinyl trialkoxy silane, alkyl maleic acid monoester, alkyl fumaric acid monoe Ether, alkyl itaconic acid monoester, acrylonitrile, methacrylonitrile,
Vinylidene chloride, ethylene, propylene, vinyl chloride,
Examples thereof include monomers such as vinyl acetate and butadiene. In addition, examples thereof include, but are not limited to, these monomers. Two or more kinds of these monomers can be used for copolymerization.

The urethane resin is composed of polyol, polyisocyanate, chain extender, crosslinking agent and the like. Examples of polyols include dehydration reaction between glycols containing polyoxyethylene glycol, polyoxypropylene glycol, polyethers such as polyoxytetramethylene glycol, polyethylene adipate, polyethylene-butylene adipate, polycaprolactone, etc. and dicarboxylic acid. Examples of the polyesters, polycarbonates having a carbonate bond, acrylic polyols, castor oil and the like. Examples of polyisocyanates include tolylene diisocyanate, phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, and the like. Examples of chain extenders or crosslinking agents are ethylene glycol, propylene glycol, diethylene glycol, trimethylolpropane, hydrazine, ethylenediamine, diethylenetriamine, triethylenetetramine, 4,4'-diaminodiphenylmethane, 4,4 '.
-Diaminodicyclohexylmethane, water and the like.

Modified products of polyester resin, acrylic resin and urethane resin can also be used. For example, polyester-modified acrylic resin, polyester-modified urethane resin, acrylic-modified urethane resin, etc. may be mentioned.

The polymer resin in the present invention preferably has water solubility or water dispersibility from the viewpoint of environmental pollution and explosion proof. Further, an organic solvent may be contained as an auxiliary agent for the water-soluble or water-dispersible resin within the scope of the present invention.

The cross-linking agent forming the coating layer is 1 to
The content is 50% by weight, and more preferably 5 to 40% by weight. One or more polymer resins selected from polyester resins, acrylic resins and urethane resins are contained in an amount of 50 to 99% by weight, more preferably 60 to 90% by weight. If the amount of the cross-linking agent is less than 1% by weight in the coating layer, a sufficient cross-linking structure is not formed and the adhesion with the ITO film may be reduced. On the other hand, when the amount of the cross-linking agent exceeds 50% by weight, the hardness of the coating layer may be increased, the stress relaxation property may be lost, and the adhesion with the ITO film may be reduced. If the amount of one or more polymer resins selected from polyester resins, acrylic resins and urethane resins is less than 50% by weight, the adhesion to the polyester film base material may decrease. On the other hand, if it exceeds 99% by weight, the amount of the cross-linking agent added becomes small, which is not preferable.

The above composition used in the present invention is used in the form of an aqueous coating solution such as an aqueous solution, an aqueous dispersion or an emulsion to form a coating layer (hereinafter sometimes referred to as "coating"). Is preferred. In order to form a coating film, if necessary, a resin other than the above composition, for example, a lubricant (filler, wax), an antistatic agent, a colorant, a surfactant, an ultraviolet absorber, etc. may be added. it can. In particular, by adding a lubricant, the lubricity and blocking resistance can be further improved.

The solid content concentration of the aqueous coating liquid is usually 20% by weight.
It is below, and more preferably 1 to 10% by weight. If this proportion is less than 1% by weight, the wettability onto the polyester film may be insufficient, while if it exceeds 20% by weight, the stability of the coating composition and the coating appearance may deteriorate.

The application of the aqueous coating liquid to the polyester film can be carried out at any stage, but it is preferably carried out in the production process of the polyester film, and further, the polyester film before the completion of the oriented crystallization is carried out. It is preferably applied.

Here, the polyester film before crystal orientation is completed means an unstretched film, a uniaxially oriented film obtained by orienting the unstretched film in either the longitudinal direction or the transverse direction, and further in the longitudinal direction and the transverse direction. And a biaxially stretched film which has been stretched and oriented in two directions at a low ratio (before the biaxially stretched film is finally re-stretched in the longitudinal direction or the transverse direction to complete the oriented crystallization).

Among them, it is preferable to apply an aqueous coating solution of the above composition to an unstretched film or a uniaxially stretched film oriented in one direction, and then carry out longitudinal stretching and / or transverse stretching and heat setting as it is.

When the aqueous coating liquid is applied to the film, the film surface is subjected to physical treatment such as corona surface treatment, flame treatment, plasma treatment or the like as a pretreatment for improving the coating property, or it is applied together with the composition. And a chemically inactive surfactant are preferably used together.

Such a surfactant accelerates the wetting of the polyester film with the aqueous coating liquid.
Anionic and nonionic surfactants such as polyoxyethylene alkyl phenyl ether, polyoxyethylene-fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, fatty acid metal soap, alkyl sulfate, alkyl sulfonate, alkyl sulfosuccinate, etc. Can be mentioned. The surfactant is preferably contained in the composition forming the coating film in an amount of 1 to 10% by weight.

The coating amount of the coating liquid is 0.01 to 0.01
The amount is preferably 0.3 μm, preferably 0.02 to 0.25 μm. If the thickness of the coating film is too thin, the adhesive strength will be insufficient, and conversely if it is too thick, blocking may occur or the haze value may increase.

As a coating method, any known coating method can be applied. For example, a roll coating method, a gravure coating method, a roll brushing method, a spray coating method, an air knife coating method, an impregnation method, a curtain coating method or the like can be used alone or in combination. The coating film may be formed on only one side of the film, or may be formed on both sides, as required.

[0039]

EXAMPLES The present invention will be described in more detail with reference to examples. In Examples and Comparative Examples, the haze value, friction coefficient (μs), surface roughness (Ra), adhesiveness, and blocking resistance were evaluated by the following methods.

(1) Haze value The haze value of the film was measured using a haze meter (NDH-20) manufactured by Nippon Denshoku Industries Co., Ltd. The haze of the film was evaluated according to the following criteria. ⊚: Haze value ≦ 1.0% …… very good film haze ◯: 1.0% <haze value ≦ 4.0% …… good film haze ×: 4.0% <haze value …… film haze Bad

(2) ITO Film Adhesion / Adhesion (Before Etching) An ITO film was laminated on the surface of the easily adhesive coating layer by vapor deposition to a thickness of 50 nm, and a cross-cut of a grid (1 mm ² square was 1
00 pieces), a 24 mm wide cellophane tape (manufactured by Nichiban Co., Ltd.) was adhered thereon, and the peeled state after the rapid peeling at a peeling angle of 180 ° was observed and evaluated according to the following criteria. 5: Peeling area is 0% ...... Adhesive strength is extremely good 4: Peeling area is more than 0% and 10% or less ...... Adhesive strength is good 3: Peeling area is more than 10% and 20% or less ...... Adhesive strength is slightly good 2: Peeling area is more than 20% and 30% or less ...... Adhesive strength is poor 1: Peeling area is more than 30% ...... Adhesive strength is extremely poor

Adhesiveness (after etching) An ITO film having a thickness of 50 nm was laminated on the surface of the easily adhesive coating layer by immersing it in a 3% sodium hydroxide aqueous solution at 50 ° C. for 1 minute and then taken out at room temperature. Cross-cut cross-cuts (1 mm2 squares 10
0 pieces), a cellophane tape of 24 mm width (manufactured by Nichiban Co., Ltd.) was adhered thereon, and the peeled state after sharp peeling at a peeling angle of 180 ° was observed and evaluated according to the following criteria. 5: Peeling area is 0% ...... Adhesive strength is extremely good 4: Peeling area is more than 0% and 10% or less ...... Adhesive strength is good 3: Peeling area is more than 10% and 20% or less ...... Adhesive strength is slightly good 2: Peeling area is more than 20% and 30% or less ...... Adhesive strength is poor 1: Peeling area is more than 30% ...... Adhesive strength is extremely poor

An ITO film having a thickness of 50 nm laminated by vapor deposition on the surface of the scratch-resistant and easily-adhesive coating layer has a width of 2 cm and a load of 500 with gauze.
It was reciprocated 100 times at g, and the scratched state was visually observed, and the number of scratches was evaluated according to the following criteria. 5: The number of scratches is 0 .. Extremely good scratch resistance. 4: The number of scratches is more than 0 and 2 or less ..... Good scratch resistance. 3: The number of scratches is more than 2 and 5 or less. Good 2: The number of scratches is more than 5 and 10 or less …… Scratch resistance is poor 1: The number of scratches is more than 10 …… Scratch resistance is extremely poor

(3) Blocking resistance Two films were superposed so that the coating film-formed surface and the non-formed surface were in contact with each other, and then 0.6 kg / kg for 17 hours in an atmosphere of 60 ° C. and 80% RH. Apply a pressure of cm ² ,
After that, peeling was performed, and the blocking resistance was evaluated according to the following criteria by the peeling force. ⊚: Peeling force <98 mN / 5 cm …… Very good blocking resistance ◯: 98 mN / 5 cm ≦ Peeling force <147 mN / 5 cm ...
Good blocking resistance Δ: 147 mN / 5 cm ≦ peeling force <196 mN / 5 cm
…… Slightly good blocking resistance ×: 196 mN / 5 cm ≦ peeling force …… Poor blocking resistance

(4) About 10 mg of the glass transition temperature sample was enclosed in an aluminum pan for measurement, and the differential calorimeter (V4.OB2000 manufactured by DuPont) was used.
Type DSC), 3 at a speed of 25 ° C to 20 ° C / min
The temperature is raised to 00 ° C., and the temperature is kept at 300 ° C. for 5 minutes, taken out, immediately transferred onto ice, and rapidly cooled. The pan is mounted on the differential calorimeter again, and the glass transition temperature (Tg: ° C) is measured by raising the temperature from 25 ° C at a rate of 20 ° C / min.

(5) Intrinsic viscosity Intrinsic viscosity ([η] dl / g) is measured with an o-chlorophenol solution at 25 ° C.

(6) Comprehensive Evaluation Evaluation was carried out according to the following criteria. ⊚: Adhesiveness (before etching), Adhesiveness (after etching), and scratch resistance are all 5 and haze and blocking resistance are both ◎ or ○ (comprehensive evaluation / extreme evaluation) Good) A: Adhesiveness (before etching), adhesiveness (after etching), and scratch resistance are not 3 or less, and at least 1 item is 4, and haze and blocking resistance are all evaluated as ◎. Good (Comprehensive Evaluation / Good) Δ: Adhesiveness (before etching), Adhesiveness (after etching), Scratch resistance evaluation result is 2 or less and 1 or more is 3, or haze, blocking resistance There is no x in the evaluation of the property, but Δ has one or more items (comprehensive evaluation / good) x: There are one or more items of 2 or less in the evaluation results of adhesiveness (before etching), adhesiveness (after etching), and scratch resistance. Or haze, blockin resistant × in the evaluation of sex there is more than one item (comprehensive evaluation and bad)

[Examples 1 to 4 and Comparative Example 1] Molten polyethylene terephthalate ([η] = 0.61 dl / g, Tg)
= 79 ° C.) through a die, cooled by a cooling drum by a conventional method to obtain an unstretched film, and then stretched by 3.6 times in the machine direction, and then coated on one side thereof with the coating composition (coating liquids 1 to 1). 5
The composition is a coating composition shown in Table 1 below. ) Was uniformly applied with an aqueous coating liquid roll coater having a concentration of 4%.

[0049]

[Table 1]

Crosslinking agent 1: 25 mol% of methyl methacrylate / 2 mol% of 2-isopropenyl-2-oxazoline
/ Polyethylene oxide (n = 10) methacrylate 1
It is composed of 0 mol% / acrylamide 35 mol%.

The crosslinking agent 1 is disclosed in JP-A-63-37167.
It was manufactured as follows according to the method described in Production Examples 1 to 3 of the publication. That is, a four-necked flask was charged with 3 parts of sodium laurylsulfonate as a surfactant and 181 parts of ion-exchanged water and heated to 60 ° C. in a nitrogen stream, and then ammonium persulfate 0.5 part was added as a polymerization initiator.
Parts, 0.2 parts of sodium hydrogen nitrite, and further monomers 25 parts of methyl methacrylate, 30 parts of 2-isopropenyl-2-oxazoline, 10 parts of polyethylene oxide (n = 10) methacrylic acid, acrylamide 35 parts of mixture over 3 hours, the liquid temperature is 60 ~ 70 ° C.
Was added while adjusting so that After the dropping was completed, the reaction was continued under stirring while maintaining the same temperature range for 2 hours, and then cooled to obtain a crosslinking agent 1 having a solid content of 35%.

Crosslinking agent 2: N, N, N ', N'-tetraglycidyl-m-xylylenediamine (trade name Tetrad X manufactured by Mitsubishi Gas Chemical Co., Inc.).

Cross-linking agent 3: Methylolated melamine (trade name MX-035 manufactured by Sanwa Chemical Co., Ltd.) Cross-linking agent 4: γ-glycidoxypropyltrimethoxysilane (trade name Sila Ace S510 manufactured by Chisso Co.) Polymer resin 1 : Acid component is 70 mol% of 2,6-naphthalenedicarboxylic acid / 24 mol% of isophthalic acid / 5 mol of 5-sodium sulfoisophthalic acid, glycol component is 90 mol% of ethylene glycol / 10 diethylene glycol
It is composed of mol%. (Tg = 80 ° C., average molecular weight 12000).

The polymer resin 1 is described in JP-A 06-116.
It was manufactured as follows according to the method described in Example 1 of Japanese Patent No. 487). That is, 70 parts of dimethyl 2,6-naphthalenedicarboxylate, 24 parts of dimethyl isophthalate, 6 parts of dimethyl 5-sodium sulfoisophthalate, 90 parts of ethylene glycol, and 10 parts of diethylene glycol were charged into a reactor, and tetrabutoxytitanium. In a nitrogen atmosphere, 05 parts was added and the temperature was controlled to 230 ° C. to heat the mixture, and the produced methanol was distilled off to carry out a transesterification reaction. Then gradually raise the temperature of the reaction system to 255 ° C.
Up to 1 mmHg and the polycondensation reaction was performed to obtain a polymer resin 1.

Polymer resin 2: methyl methacrylate 70
It is composed of mol% / ethyl acrylate 20 mol% / N-methylol acrylamide 5 mol% / acrylic acid 5 mol%.

The polymer resin 2 is described in JP-A-63-371.
It manufactured as follows according to the method of the manufacture examples 1-3 of the 67 gazette. That is, a four-necked flask was charged with 3 parts of sodium laurylsulfonate as a surfactant and 181 parts of ion-exchanged water and heated to 60 ° C. in a nitrogen stream, and then ammonium persulfate of 0.1.
5 parts and 0.2 parts of sodium hydrogen nitrite were added, and further monomers 70 parts of methyl methacrylate, 20 parts of ethyl acrylate, 5 parts of N-methylol acrylamide,
A mixture of 5 parts of acrylic acid was added to the mixture at a liquid temperature of 60
The mixture was added dropwise while adjusting the temperature to be ~ 70 ° C. After completion of dropping, the reaction was continued under stirring while maintaining the same temperature range for 2 hours, and then cooled to obtain polymer resin 2 having a solid content of 35%.

Wetting agent: polyoxyethylene (n = 7) lauryl ether (manufactured by Sanyo Kasei Co., Ltd., trade name Naloacty N-70) Then, the coated film is subsequently dried at 95 ° C. and laterally at 120 ° C. The film was stretched 3.8 times, contracted by 3% in the width direction at 220 ° C., and heat-set to obtain an easily-adhesive film having a thickness of 125 μm. The thickness of the coating film was 0.10 μm.

[Example 5] Molten polyethylene-2,6-
Naphthalate ([η] = 0.63 dl / g, Tg = 12
(1 ° C.) was extruded from a die, cooled in a cooling drum by a conventional method to give an unstretched film, and then stretched 3.5 times in the machine direction, and then the coating composition (Coating liquid 1 in Table 1) was formed on one surface of the unstretched film. An aqueous coating solution having a concentration of 8%) was uniformly applied with a roll coater. The coated film is then subsequently dried at 105 ° C. and stretched in the transverse direction at 140 ° C. 3.7 times, 230
The film was shrunk by 3% in the width direction at 0 ° C. and heat-fixed to obtain an easily-adhesive film having a thickness of 188 μm. The thickness of the coating film is 0.10μ
It was m.

[Comparative Example 2] A film was formed in the same manner as in Examples 1 to 4 except that the coating liquid was not applied.

[0060]

[Table 2]

[0061]

EFFECT OF THE INVENTION According to the easily adhesive polyester film for ITO film of the present invention, a film having excellent adhesiveness, transparency and slipperiness can be obtained by using a specific easily adhesive layer. Further, the film of the present invention is useful as a base film for a touch panel, liquid crystal, EL or the like in which an ITO film is used.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // C08L 67:00 C08L 67:00 (72) Inventor Koji Kubo 3-37-19 Oyama, Sagamihara City, Kanagawa Prefecture No. Teijin DuPont Films Co., Ltd. Sagamihara Research Center F-term (reference) 4F006 AA35 AB24 AB35 AB37 BA01 CA05 DA00 4J004 AA10 AA14 AA15 AA17 CA06 CB03 CC02 CE01 FA01 FA04 4J040 DF001 ED001 EF001 HB44 HC16 HC25 HC26 JB09 NA19 MA10 MA10

Claims (4)

[Claims] 1. An easily-adhesive polyester film for an ITO film, wherein a coating layer provided on at least one surface of the polyester film contains a component having a crosslinked structure. 2. The IT according to claim 1, wherein the component having a crosslinked structure is formed from at least one selected from the group consisting of an epoxy compound, an oxazoline compound, a melamine compound, an isocyanate compound and a coupling agent.
Easy-adhesive polyester film for O film. 3. The coating layer contains as a component at least one polymer resin selected from the group consisting of polyester resins, acrylic resins and urethane resins.
The easily-adhesive polyester film for ITO film as described in 1. 4. The easily adhesive polyester film for an ITO film according to claim 1, wherein the polyester constituting the polyester film is mainly composed of polyethylene terephthalate or polyethylene-2,6-naphthalate.