JPH07241971A - Easy adhesive polyester film - Google Patents

Abstract

PURPOSE:To obtain an easy adhesive polyester film reduced in the lowering of close adhesiveness under high temp. and high humidity environment by laminating a film mainly based on an acrylic resin having one or more kind of a crosslinkable functional group in its molecule and an organometal compd. to at least the single surface of a polyester film. CONSTITUTION:In an easy adhesive polyester film suitable as a base material film used in a magnetic recording material or a photographic material of every kind, a film containing an acrylic resin having at least one or more kind of a crosslinkable functional group in its molecule and an organometal compd. as main constitutional components is laminated to at least the single surface of a polyester film. The acrylic resin having the crosslinkable functional group to be used has glass transmition temp. of 0-10 deg.C and the lamination thickness of the film is set to 0.01-2mum. The mixing ratio of the acrylic resin and the organometal compd. is set to 99/1-20/80 and, as a metal of the organometal compd., titanium, aluminum or zirconium is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily-adhesive polyester film, and more specifically, it has excellent adhesion, scratch resistance, moisture-proof adhesion, etc., and is a magnetic recording material, various photographic materials, packaging materials, and electrical insulating materials. The present invention relates to an easily-adhesive polyester film suitable as a base film used for, for example, and more specifically, to an easily-adhesive polyester film that does not exhibit a decrease in adhesion even under a high temperature and high humidity environment. Particularly, the present invention relates to an easily-adhesive polyester film suitable as a base film used for a diazo photosensitive film.

[0002]

2. Description of the Related Art Polyesters, particularly polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate or poly-1,4-cyclohexanedimethylene terephthalate, and polyesters mainly containing these have excellent physical and chemical properties. It is widely used as a fiber, a film or a sheet, and a molded product thereof.

In particular, since polyester films have excellent heat resistance, chemical resistance and mechanical properties, they are used in many applications such as magnetic recording materials, various photographic materials, packaging materials, electrical insulating materials and general industrial materials. It is used.

However, since polyester itself is generally inactive and poor in adhesiveness, various coatings such as diazo photosensitive paint, magnetic paint, chemical mat paint, gelatin composition, heat seal imparting composition, etc. are formed on the film surface.
When applying or printing ink, etc., physical treatment such as corona discharge or plasma or chemical treatment using alkali or amine chemicals is performed on the film surface to improve adhesion with the coating. Various methods are known, including a method of coating an easily-adhesive substance and the like.

However, the physical or chemical surface treatment method complicates the steps, not only increases the cost but also fails to obtain sufficient adhesiveness.

On the other hand, the method of coating an easily adhesive substance can be carried out in the production process of the polyester film, is advantageous in terms of cost, and it is possible to select an adhesive substance which can be applied to various coatings. , An acrylic resin, a water-soluble and water-dispersible polyester laminated on a polyester film as an easily adhesive substance have been proposed (Japanese Patent Publication No. 3-62551).

[0007]

However, the above-mentioned conventional technique has the following problems. That is, when acryl resin, water-soluble or water-dispersible polyester are laminated, even if desired easy adhesion is obtained, the moisture resistance and water resistance of the coating film are inferior, so that the adhesion in a high temperature and high humidity environment is low. There are problems such as inferiority. The present invention eliminates these drawbacks, excellent adhesion, scratch resistance, moisture-resistant adhesion, etc.,
And to provide an easy-adhesion polyester film with less deterioration in adhesion even under a high temperature and high humidity environment, and particularly to provide an easy-adhesion polyester film suitable as a base film used for a diazo photosensitive film. .

[0008]

The present invention provides a coating film containing, on at least one side of a polyester film, an acrylic resin having at least one crosslinkable functional group in the molecule and an organometallic compound as main constituent components. The skeleton is an easily-adhesive polyester film characterized by being laminated.

The polyester of the polyester film referred to in the present invention is produced by esterification or transesterification of dicarboxylic acid or its ester-forming derivative with glycol and polycondensation reaction. The type of polyester is not particularly limited as long as it can be formed into a film. Suitable polyesters that can be formed into a film are those using an aromatic dicarboxylic acid as a dicarboxylic acid component, such as polyethylene terephthalate, 6-naphthalate, polybutylene terephthalate, polyethylene α, β-. Bis (2-chlorophenoxy) ethane 4,4, -dicarboxylate, etc.,
Of these, polyethylene terephthalate is most preferable in consideration of quality, economy and the like. Therefore, polyethylene terephthalate (hereinafter abbreviated as PET) will be described below as a representative example of polyester.

PET is 80 mol% or more, preferably 9
Although 0 mol% or more, more preferably 95 mol% or more, has ethylene terephthalate as a repeating unit,
Some other dicarboxylic acid components and diol components may be copolymerized. Known additives such as heat resistance stabilizer, oxidation resistance stabilizer, weather resistance stabilizer, ultraviolet absorber, organic lubricant, pigment, dye, organic or inorganic fine particles, filler, antistatic agent, etc. You may mix | blend a nucleating agent etc. The PET film described above has an intrinsic viscosity (measured in orthochlorophenol at 25 ° C.) of 0.40 to 1.20 dl / g, preferably 0.50 to 0.80 dl / g. It is suitable for the content. The polyester film in the present invention is preferably biaxially oriented from the viewpoint of mechanical and thermal characteristics in the state where the easily adhesive layer is laminated. For example, polyester is dried, melt-extruded to obtain an unstretched sheet, and then biaxially stretched and heat-treated to produce a film. Biaxial stretching is longitudinal or transverse sequential stretching, or
Biaxial simultaneous stretching may be used, and the stretching ratio is not particularly limited, but is usually 2.0 to 5.0 in each of the longitudinal and transverse directions.
Double is appropriate. Alternatively, it may be re-stretched in either the longitudinal or lateral direction after the longitudinal or transverse stretching. The thickness of the polyester is not particularly limited, but 2 to 500 μm is preferably used.

The acrylic resin, which is a constituent of the easily adhesive coating layer laminated on the polyester film surface of the present invention, has at least one crosslinkable functional group in the molecule. Such an acrylic resin can be manufactured by a known method. The following can be exemplified as the monomer component constituting the resin, but it is not particularly limited as long as it satisfies the above requirements. Examples of monomers used for polymerization of the acrylic resin include alkyl acrylate and alkyl methacrylate (wherein the alkyl group is a methyl group, an ethyl group, an n-propyl group, an isopropyl group,
(n-butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, lauryl group, stearyl group, cyclohexyl group, phenyl group, benzyl group, etc.) as a basic skeleton, and the following functional groups are further added. It is copolymerized with a monomer having various functional groups. That is, as the functional group, a carboxyl group, a methylol group, an acid anhydride group, a sulfonic acid group, an amide group or an alkylated amide group, an amino group (including a substituted amino group) or an alkylated group. Examples thereof include an amino group, a hydroxyl group and an epoxy group, and salts or esterified products thereof may be copolymerized.

Examples of the compound having a carboxyl group and / or its salt or an acid anhydride group include acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, alkali metal salts of these carboxylic acids, and ammonium. Examples thereof include salts and anhydrides.

Examples of the compound having a sulfonic acid group and / or a salt thereof include vinyl sulfonic acid, styrene sulfonic acid, alkali metal salts and ammonium salts thereof.

Examples of the compound having an amide group or an alkylated amide group include acrylamide, methacrylamide, N-methylmethacrylamide, methylated acrylamide, methylated methacrylamide, ureido vinyl ether and β. -Ureido isobutyl vinyl ether, ureido ethyl acrylate and the like can be mentioned.

Examples of the compound having an amino group or an alkylated amino group and / or a salt thereof include diethylaminoethyl vinyl ether, 2-aminoethyl vinyl ether, 3-aminopropyl vinyl ether,
2-aminobutyl vinyl ether, dimethylaminoethyl methacrylate, dimethylaminoethyl vinyl ether, and those obtained by methylating their amino groups,
Examples thereof include those which are quaternized with an alkyl halide, dimethyl sulfate, sultone, and the like.

Examples of the compound having a hydroxyl group include β-hydroxyethyl acrylate, β-hydroxyethyl methacrylate, β-hydroxypropyl acrylate and β
-Hydroxypropyl methacrylate, β-hydroxyvinyl ether, 5-hydroxypentyl vinyl ether, 6-hydroxyhexyl vinyl ether, polyethylene glycol monoacrylate, polyethylene glycol monomethacrylate, Examples thereof include polypropylene glycol monoacrylate and polypropylene glycol monomethacrylate.

Examples of the compound having an epoxy group include glycidyl acrylate and glycidyl methacrylate.

Specific preferred examples of the acrylic resin having a crosslinkable functional group include acrylic acid having a crosslinkable functional group in methyl methacrylate, ethyl acrylate and / or butyl acrylate, and N-methyl acrylamide. Examples thereof include quaternary acrylic copolymers copolymerized in a desired ratio, but are not limited thereto.

In addition to the above, the following compounds may be used in combination. That is, acrylonitrile, methacrylonitrile, styrenes, butyl vinyl ether, maleic acid mono- or dialkyl esters, itaconic acid mono- or dialkyl esters, methyl vinyl ketone, vinyl chloride, vinylidene chloride, vinyl acetate, vinyl pyridine, vinyl pyrrolidone, vinyl trisalkoxy. Silane and the like, and of course, are not limited to these.

The monomer having the crosslinkable functional group and the other compound may be copolymerized with the monomer serving as the basic skeleton at an arbitrary ratio to copolymerize two or more kinds of monomers. As a specific example of the preferable ratio, the ratio of the monomer having a crosslinkable functional group to the monomer serving as the basic skeleton is usually 1 to
It is about 10% by weight.

The acrylic resin used in the present invention has a glass transition temperature of 0 ° C. or higher and 100 ° C. or lower, preferably 20.
It is desirable that the temperature is not lower than 80 ° C and not higher than 80 ° C. When an acrylic resin having a low glass transition temperature is used, the adhesion tends to be poor under high temperature and high humidity, and conversely, when it is too high, cracking may occur during stretching. The glass transition temperature of the acrylic resin can be arbitrarily set depending on the monomer used. For example, to obtain a polymer having a high glass transition temperature, the copolymerization amount of methyl methacrylate is increased to obtain a resin having a low glass transition point. For this purpose, copolymerization of long-chain alkyl acrylate is effective. Further, when the molecular weight of the acrylic resin is 450,000 or more, the toughness of the easily adhesive layer is increased, which is particularly preferable.

When the easily adhesive coating is laminated by the above-mentioned method, the acrylic resin is preferably soluble in, emulsified or suspended in water from the viewpoint of environmental pollution and explosion proof, and such a copolymer has a hydrophilic group. Copolymerization with monomers having acrylic acid (acrylic acid, methacrylic acid, acrylamide, vinyl sulfonic acid and its salts, etc.) or emulsion polymerization using a surfactant,
It can be prepared by a known method such as suspension polymerization or soap-free polymerization without using a surfactant.

Further, in the present invention, it is necessary to add an organometallic compound to the above acrylic resin. The organometallic compound in the present invention is not particularly limited, but an organometallic compound containing titanium, aluminum, or zirconium as a metal species is preferable, and among them, tetraalkoxy titanium, titanium acylate, and titanium chelate are classified. Titanium organic compounds are preferred. Among the titanium organic compounds, a titanium chelate compound, especially a water-soluble titanium chelate compound obtained by cross-linking and modifying an aqueous polyamide resin with an aqueous titanium chelate compound has environmental pollution and explosion proof points, or its own stability, dilution stability, and group. It is particularly desirable in terms of adhesion with the material. Typical examples are di-iso-propoxy bis (acetylacetonato) titanium, iso-propoxy (2
-Ethylhexanediolato) titanium, di-n-butoxy bis (triethanolaminato) titanium, hydroxy bis (lacto) titanium and the like can be mentioned, but not limited thereto. Commercially available titanium chelate compounds can be used, for example, TA-50 (TAA) and TAT (both manufactured by Nippon Soda Co., Ltd.).
Made) or ORGATICS TC300, TC310
(Both manufactured by Matsumoto Pharmaceutical Co., Ltd.) and the like are preferable.

The amount of the titanium chelate compound added depends on the amount of the acrylic resin (A) so that the effects of the present invention can be exhibited more remarkably.
/ Titanium chelate compound (B) is 99 / in solid content weight ratio
The range of 1-20 / 80, preferably 98 / 2-60 / 40, and more preferably 97 / 3-70 / 30 is preferable.
If the content of the titanium chelate compound is less than 1% by weight, the effect of improving scratch resistance is poor, and if it exceeds 80% by weight, the adhesion to the coating becomes poor, which is not preferable. Two or more of these titanium chelate compounds may be used in combination. Further, other crosslinking agents such as a silane coupling agent and melamine may be used in combination as long as the effects of the present invention are not impaired.

Further, in the present invention, another aqueous resin may be cross-linked modified with a titanium chelate compound to obtain a titanium modified aqueous resin. The titanium-modified aqueous resin is not particularly limited, but in the present invention, an aqueous polyamide resin obtained by crosslinking and modifying with an aqueous titanium compound is preferably used. For example, commercially available products include Organix WS680 and WS522 manufactured by Matsumoto Pharmaceutical Co., Ltd. The ratio of the aqueous resin to the titanium chelate compound is not particularly limited, but is usually in the range of 20/80 to 80/20.

In the easily-adhesive coating film, known additives such as heat-resistant stabilizers, oxidation-resistant stabilizers, weather-resistant stabilizers, UV absorbers, organic lubricants, etc. may be added within a range that does not impair the effects of the present invention. Pigments, dyes, organic or inorganic fine particles, fillers, antistatic agents, nucleating agents and the like may be added.

As the preferred method for laminating the easily adhesive coating, a method of applying it during the production process of the polyester film and stretching it together with the substrate is particularly suitable. For example, a melt-extruded polyester film before crystal orientation is stretched about 2.0 to 5.0 times in the longitudinal direction, the surface to be continuously applied is subjected to corona discharge treatment, and the coating agent is applied to the treated surface. The applied film is dried while passing through a zone heated in stages and stretched in the width direction by about 2.0 to 5.0 times. Further, it is obtained by a method of continuously introducing a heating zone of 150 to 250 ° C. to complete the crystal orientation. The coating liquid used in this case is preferably an aqueous system from the viewpoint of environmental pollution and explosion proof.

The thickness of the coating film is 0.01 to 2 μm, preferably 0.03 to 0.5 μm, more preferably 0.05 to
The range of 0.3 μm is preferable. If the thickness of the easy-adhesion layer is too thick, the coating film itself tends to be cleaved, and if it is too thin, the adhesion deteriorates. As a method of coating on the substrate film, a known coating method, for example, a river coat method, a gravure coat method, a rod coat method, a die coat method or the like can be used.

In the above-mentioned easy-adhesion layer, known additives such as a heat stabilizer, an oxidation stabilizer, a weather stabilizer, an ultraviolet absorber, an organic slippery agent, within a range that does not impair the effects of the present invention,
Pigments, dyes, organic or inorganic fine particles, fillers, antistatic agents, nucleating agents and the like may be added.

Next, an example of the method for producing the easily adhesive polyester film of the present invention will be described, but the method is not limited to this.

After PET is dried by a conventional method, it is melt extruded, and the extruded sheet-like melt is cooled and solidified to prepare an unstretched PET film. 80-120 this film
It is heated to 0 ° C. and stretched 2.0 to 5.0 times in the longitudinal direction to obtain a uniaxially oriented film. Corona discharge treatment is applied to one surface of this film, and an easily adhesive layer forming water-based coating agent is applied to this treated surface. The coated film was heated at 90 to 140 ° C. and stretched 2.0 to 5.0 times in the width direction, followed by 1
It is introduced into a heat treatment zone at 60 to 240 ° C. and heat treated for 1 to 10 seconds. During this heat treatment, if necessary, widthwise 3
A relaxation treatment of up to 12% may be applied.

By coating the coating layer side of the thus obtained easily-adhesive polyester film with a coating agent suitable for various purposes, for example, easy adhesion of diazo photosensitive paint, easy adhesion of electrophotographic toner, chemical matte paint. It is preferably used as a base film for inorganic coating such as easy adhesion and vapor deposition, magnetic recording materials, cellophane ink, offset ink, and UV-curable ink.

[0033]

[Characteristic Measuring Method and Effect Evaluation Method] The characteristic measuring method and effect evaluating method in the present invention are as follows.

(1) Adhesiveness The diazo photosensitive coating was applied on the film surface using a bar coater so that the thickness after drying was 6 μm to form a coating layer. After coating, it is dried at 100 ° C. for 2 minutes, and after drying, a dry diazo copying machine RICOPYSM2300F (Reco Ltd.)
Developed), put a cross-cut (cross-cut) in 1mm width on the unexposed area (color development area), attach a cellophane adhesive tape (Nichiban Co., Ltd.), press strongly by hand, then 180 degrees Peeled rapidly in the direction. At this time, the residual area ratio of the coating layer remaining on the film surface side was measured, and those that did not peel at all were marked as [◎], and the residual area ratio of 90% or more was marked as [○], and those that did not meet all were marked as [X]. did.

(2) Moisture Resistance Adhesion Property The film provided with the coating layer prepared in the above (1) is 40 ° C.
After leaving it in an atmosphere of × 90% RH for 15 hours and taking it out, a dry diazo copying machine RICOPY SM2300F (available from Co., Ltd.)
After developing with Ricoh), put a cross cut (cross-cut) in 1 mm width in the unexposed area (coloring area), attach a cellophane adhesive tape (Nichiban Co., Ltd.), and press it firmly by hand,
It peeled off rapidly in the direction of 180 degrees. At this time, the remaining area ratio of the coating layer remaining on the film surface side was measured, and the one that did not peel at all was marked with [◎], and the remaining area ratio of 90% or more was marked with [○],
Anything less than that was marked as [x].

(3) Scratch resistance The diazo photosensitive coating composition was applied on the film surface with a bar coater so that the thickness after drying was 6 μm to form a coating layer. After coating, it is dried at 100 ° C. for 2 minutes, and after drying, a dry diazo copying machine RICOPYSM2300F (Reco Ltd.)
Developed). A surface quality measuring device HEIDON-14DR manufactured by Shinto Kagaku Co., Ltd. was used to apply a sapphire needle having a tip of 0.1 mmφ at a right angle to the unexposed portion (coloring portion), and the sapphire needle was moved at a sample moving speed of 100 mm / min. The load applied was changed, and the load at which the surface of the previously unexposed portion (coloring portion) started to be damaged was used as an index of scratch resistance and judged according to the following criteria. The load at which the surface starts to be damaged is correlated with the pencil hardness. ◯: 120 g or more Δ: 80 to less than 120 g ×: less than 80 g (4) Glass transition temperature The acrylic resin in the resin for forming an easy-adhesion layer is measured by a differential scanning calorimeter (PERKIN ELMER DSC-2 type (PERK).
IN ELMER) at 300 ° C. for 5 minutes
After cooling, it was cooled rapidly and then measured at a heating rate of 20 ° C./min.

Next, the present invention will be explained based on examples, but the present invention is not necessarily limited to these.

[0038]

【Example】

Example 1 0.015% of colloidal silica having an average particle size of 0.4 μm
And PET pellets containing 0.005% of colloidal silica having an average particle size of 1.5 μm (an intrinsic viscosity of 0.6
2 dI / g) was sufficiently dried in vacuum, then supplied to an extruder, melt-extruded at 280 ° C., filtered with a 10 μm-cut metal sintered filter, and then extruded into a sheet from a T-shaped die. Was wrapped around a cooling drum at 30 ° C. to be cooled and solidified. In order to improve the adhesion between the sheet and the cooling drum during this period, a wire electrode is arranged on the sheet side to provide 6 KV.
DC voltage was applied. Unstretched PET thus obtained
The film was heated to 95 ° C. and stretched 3.5 times in the longitudinal direction to obtain a uniaxially stretched film. One side of this film was subjected to corona discharge treatment in an air atmosphere, and an easily-adhesive layer-forming water-based coating having the following compounding ratio (solid content ratio) was prepared on the treated surface and applied by a gravure coat method. . The coating thickness was such that the easy adhesion layer had a thickness of 0.1 μm after biaxial stretching.

[Easy Adhesive Layer-Forming Water-Based Paint] Mixing Ratio (A) Acrylic Resin Emulsion with Tg = 30 ° C. Having Crosslinkable Functional Group 80% by Weight (Composition) Composition Ratio (% by Weight) Methyl Methacrylate (hereinafter , MMA) 60 ethyl acrylate (hereinafter abbreviated as EA) 40 acrylic acid (hereinafter abbreviated as AA) 2 N-methylolacrylamide (hereinafter abbreviated as N-MAM) 4 (B) Di-n-butoxy bis (triethanolamine) titanium 20% by weight A uniaxially stretched film coated with this water-based coating composition was dried at 110 ° C.
After the water is introduced into the preheating zone heated to 100 ° C. to dry the water, it is continuously gripped by a heating zone at 130 ° C. and stretched 3.5 times in the width direction, followed by heating at 225 ° C. -N 5
Heat treatment was performed for 2 seconds to obtain an easily adhesive polyester film having a thickness of 50 μm and provided with an easily adhesive layer thickness of 0.1 μm.

Table 1 shows the evaluation results of this easily-adhesive polyester film. The adhesiveness and scratch resistance of the coating layer provided on the side of the easily adhesive layer were extremely good, and the adhesiveness did not decrease even in a high temperature and high humidity environment.

Example 2 An aqueous coating composition for forming an easy-adhesion layer was prepared in the same manner as in Example 1 except that the component ratios of (A) and (B) in Example 1 were changed as follows. Created, easy adhesion layer thickness 0.1
An easily-adhesive polyester film having a thickness of 50 μm provided with μm was obtained. Table 1 shows the evaluation results of the easily adhesive polyester film. The adhesiveness and scratch resistance of the coating layer provided on the side of the easily adhesive layer were extremely good, and the adhesiveness did not decrease even in a high temperature and high humidity environment.

(A) MMA / EA / AA / N-MAM = 60/40/2/4 (% by weight) 60% by weight (B) Di-n-butoxy bis (triethanolamineminato) titanium 40% by weight Implementation Example 3 An easily-adhesive layer was formed in the same manner as in Example 1 except that the titanium chelate compound was changed from di-n-butoxy bis (triethanolamine aminato) titanium to zirconium lactate, and the component ratios were as shown below. A water-based coating material was prepared to obtain an easily-adhesive polyester film having a thickness of 50 μm provided with an easily-adhesive layer thickness of 0.1 μm. Table 1 shows the evaluation results of the easily adhesive polyester film. The adhesiveness and scratch resistance of the coating layer provided on the easy-adhesion layer side were extremely good, and the adhesiveness was not significantly reduced even in a high temperature and high humidity environment.

(A) MMA / EA / AA / N-MAM = 65/35/2/2 (wt%) 90 wt% Tg = 42 ° C. (B) Zirconium lactate (eg Matsumoto Pharmaceutical Co., Ltd.) ZB-110) 10% by weight Example 4 An easy adhesion layer was formed in the same manner as in Example 3 except that the zirconium lactate of Example 3 was changed to the titanium-modified aqueous resin Organix WS680 and the compounding ratio was changed as follows. A water-based coating material is formed to form an easily adhesive layer with a thickness of 0.1.
An easily-adhesive polyester film having a thickness of 50 μm provided with μm was obtained. Table 1 shows the evaluation results of the easily adhesive polyester film. The coating layer provided on the easily adhesive layer side had good adhesion, scratch resistance, and adhesion in a high temperature and high humidity environment.

(A) MMA / EA / AA / N-MAM = 25/75/4/2 (wt%) 60 wt% Tg = 42 ° C. (B) Titanium-modified aqueous resin Organix WS680 40 wt% Example 5 An aqueous coating material for forming an easy-adhesion layer was prepared in the same manner as in Example 1 except that the composition and solid content ratio were as shown below. An adhesive polyester film was obtained. Table 1 shows the evaluation results of the easily adhesive polyester film. The coating layer provided on the easily adhesive layer side had good adhesion, scratch resistance, and adhesion in a high temperature and high humidity environment.

(A) MMA / EA / AA / N-MAM = 80/20/2/3% by weight 85% by weight Tg = 80 ° C. (B) Di-n-butoxybis (triethanolamineminato) titanium 10% by weight % (C) Aminosilane (SH6020 manufactured by Toray Dauko-Ningu Co., Ltd.) 5% by weight Comparative Example 1 Aqueous coating agent for forming an easily-adhesive layer by diluting acrylic resin emulsion having a crosslinkable functional group alone with water to 3% by weight In the same manner as in Example 1, an easy-adhesion polyester film having a thickness of 50 μm provided with an easy-adhesion layer thickness of 0.1 μm was obtained. Table 1 shows the evaluation results of the easily adhesive polyester film. Although the adhesiveness was good, the adhesiveness was remarkably lowered in a high temperature and high humidity environment, and the scratch resistance was poor.

(A) MMA / EA / AA / N-MAM = 60/40/2/4 (wt%) 100 wt% Tg = 30 ° C. Comparative Example 2 As an acrylic resin emulsion having a crosslinkable functional group and a crosslinker Hexamethylolated melamine was used to prepare an aqueous coating composition for forming an adhesive layer with a compounding ratio as described below. An adhesive polyester film was obtained. Table 1 shows the evaluation results of the easily adhesive polyester film. It was also inferior in scratch resistance, adhesion, and adhesion in a high temperature and high humidity environment.

(A) MMA / EA / AA / N-MAM = 60/40/2/4 (wt%) 90 wt% Tg = 30 ° C. (B) Hexamethylolated melamine 10 wt% Comparative Example 3 A thickness of 50 μm provided with an easy-adhesion layer thickness of 0.1 μm in the same manner as in Example 1 except for the following changes.
To obtain an easily adhesive polyester film. Table 1 shows the evaluation results of the easily adhesive polyester film. It was inferior in scratch resistance and adhesion in a high temperature and high humidity environment.

(A) MMA / EA / AA / N-MAM = 60/40/2/4 (wt%) 70 wt% (B) Block Isocyanate 30 wt%

[Table 1]

[0049]

INDUSTRIAL APPLICABILITY According to the present invention, an easy-adhesion layer coating film containing, as main components, an acrylic resin having at least one crosslinkable functional group in the molecule and a titanium organic compound is laminated on at least one surface of a polyester film. It is an easy-adhesive polyester film and has excellent adhesion, particularly excellent adhesion in a high temperature and high humidity environment, has scratch resistance, and is preferably used as a base film used for a diazo photosensitive film or the like. .

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B32B 27/30 A 8115-4F C08J 7/04 CFD F // C08L 67:02

Claims (6)

[Claims] 1. A coating film comprising an acrylic resin having at least one type of crosslinkable functional group in the molecule and an organometallic compound as main components on at least one side of a polyester film. Adhesive polyester film. 2. The glass transition temperature of the acrylic resin having a crosslinkable functional group is 0 ° C. or higher and 100 ° C. or lower, and the laminated thickness of the coating film is in the range of 0.01 to 2 μm. The easily-adhesive polyester film described in 1. 3. The mixing ratio of the acrylic resin having one or more crosslinkable functional groups in the molecule and the organometallic compound is 99.
It is / 1-20 / 80, The easily adhesive polyester film of Claim 1 or 2 characterized by the above-mentioned. 4. The easily adhesive polyester film according to claim 1, wherein the metal of the organometallic compound is titanium, aluminum or zirconium. 5. The easily adhesive polyester film according to claim 1, wherein the organometallic compound comprises a titanium chelate compound. 6. The easily-adhesive polyester film according to claim 5, wherein the titanium chelate compound according to claim 5 is an aqueous polyamide resin crosslinked and modified with an aqueous titanium chelate compound.