JPH09314775A - Easily adherent film and laminate using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film with high adhesion with a metal or glass and superb transparency by forming an easily adherent coat consisting maily or an agueous polyester resin with a specified secondary transition point and a fatty acid amide on one of the faces of a polyester film. SOLUTION: This easily adherent film comprises an easily adherent coat comprising a composition based on an agueous polyester resin, a fatty acid amide and/or a fatty acid bisamide, with a secondary transition point of 40-85 deg.C, formed on, one of the faces of a polyester film. In addition, the easily adherent film has a haze value of 1% or less and a coefficient of friction of 0.8% or less. The aqueous polyester is soluble or dispersive in water, and is a polyester which is made up of a polycarboxylic acid component such as terephthalic acid or isophthalic acid and a polyhydroxy compound such as ethylene glycol or diethylene glycol.

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 film having slipperiness and a laminate having a hard coat layer laminated on an easily adhesive coating film of the easily adhesive film.

[0002]

2. Description of the Related Art Polyester films, particularly biaxially stretched films of polyethylene terephthalate and polyethylene naphthalate, have excellent mechanical properties, heat resistance and chemical resistance, so that they are magnetic tapes, ferromagnetic thin film tapes, photographic films, 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.

These films are usually rarely used as a polyester film alone, but are often used by laminating a magnetic layer, a photosensitive layer, a protective layer, an intermediate layer, a coloring layer, a hardened layer, etc. Further, it is often used by being attached to metal or glass. Therefore, the polyester film is required to have excellent adhesiveness to other layers, metals, glass and the like.

As a method for improving the adhesiveness of a polyester film, for example, a base film of a transfer film for in-molding is coated with an aqueous polyester film having a specific second-order transition point to improve the adhesiveness with a medium layer. There is a known method (Japanese Patent Laid-Open No. 7-156358).
Issue).

However, this method improves the adhesion between the base film and the resume layer in the transfer film for in-mold, but does not improve the adhesion between the layers used for other purposes to a sufficiently satisfactory level. Many.

On the other hand, it is also known to form a coating film made of a composition containing a fatty acid amide or a fatty acid bisamide on the surface of a polyester film for the purpose of obtaining a polyester film having excellent flatness and slipperiness (special feature). Kaihei 63-
194948). However, it is not suggested that the adhesiveness is improved by using the fatty acid amide or the fatty acid bisamide.

Further, it is also known that a polyester resin layer is formed on a polyethylene terephthalate layer, and a radiation-curable layer having a specific composition is formed on the polyester resin layer to obtain an adhesive body having good surface hardness and abrasion resistance. (Japanese Patent Publication No. 7-80281). However, since this laminate uses a special curable layer, it is not versatile and is not sufficiently satisfactory in terms of adhesiveness.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and a layer used in various applications,
Providing a polyester film with excellent adhesion to metals and glass, as well as excellent transparency and slipperiness, especially suitable for surface protection materials for window glass, showcases, glasses, instruments, displays, lamps, etc. It is intended to provide a polyester film. Furthermore, by laminating a hard coat layer on a polyester film, the surface hardness,
It is intended to provide a laminate having improved wear resistance and the like.

As a result of intensive studies to solve the above problems, the present inventors have found that the surface of a polyester film is composed of an aqueous polyester and a composition containing an aliphatic amide and / or an aliphatic bisamide as main components. It has been found that the problem can be solved by forming an adhesive coating film, and the present invention has been completed.

[0010]

The object of the invention is, according to the invention, to at least one side of a polyester film,
A film having an easily-adhesive coating film formed of an aqueous polyester resin having a second-order transition point of 40 to 85 ° C. and a composition containing a fatty acid amide and / or a fatty acid bisamide as a main component, wherein the haze value of the film is 1% or less, friction coefficient (μ
This is achieved by an easily adhesive film characterized in that s) is 0.8 or less.

Further, according to the present invention, another object of the present invention is achieved by a laminated body in which a hard coat layer is laminated on at least one surface of the easily adhesive coating of the above easily adhesive film. .

The present invention will be described in more detail below.

[Polyester] The polyester constituting the polyester film in the present invention 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 and poly (1,4
-Cyclohexylene dimethylene terephthalate), polyethylene-2,6-naphthalene dicarboxylate and the like, and copolymers of these or blends thereof with a small proportion of other resins are also included.

These polyesters may optionally contain
Appropriate fillers can be included. Examples of this filler include those conventionally known as a slipperiness-imparting agent for polyester films, and examples thereof include calcium carbonate, calcium oxide, aluminum oxide, kaolin, silicon oxide, zinc oxide, carbon black, Examples thereof include silicon carbide, tin oxide, crosslinked acrylic resin particles, crosslinked polystyrene resin particles, melamine resin particles and crosslinked silicone resin particles. Furthermore, colorants, antistatic agents, antioxidants, organic lubricants, catalysts and the like can be appropriately added to the polyester.

The polyester film can be obtained by melt-extruding such polyester by a conventional method to form a film, and if necessary, orienting and heat-treating.

[Aqueous Polyester] In the present invention,
An easily-adhesive coating film composed of a composition containing an aqueous polyester and an amide of a fatty acid and / or a bisamide of a fatty acid as main components is formed on at least one surface of the polyester film.

This aqueous polyester has a second-order transition point (T
g) is 40 to 85 ° C, preferably 45 to 80 ° C. When the second-order transition point (Tg) is less than 40 ° C, the obtained film has low heat resistance and poor blocking resistance. On the other hand, when the second-order transition point (Tg) exceeds 85 ° C., the adhesion of the easily adhesive coating film is poor.

The above-mentioned aqueous polyester is a water-soluble or dispersible polyester. Such water-based polyesters include terephthalic acid, isophthalic acid, phthalic acid,
2,6-naphthalenedicarboxylic acid, hexahydroterephthalic acid, 4,4'-diphenyldicarboxylic acid, phenylindanedicarboxylic acid, adipic acid, sebacic acid, 5-
Na sulfoisophthalic acid, trimellitic acid, dimethylolpropionic acid and other polycarboxylic acid components and ethylene glycol, diethylene glycol, neopentyl glycol, 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol , Glycerin, trimethylolpropane, and polyhydroxy compound components such as alkylene oxide adducts of bisphenol A.

The above-mentioned water-based polyester is added to SO ₃ N in the polyester when it is necessary to impart further affinity.
An a group or a COONa group may be introduced, or a polyether component may be introduced.

[Famide of fatty acid, bisamide of fatty acid]
The fatty acid amide and / or fatty acid bisamide used in the present invention are R ¹ CONH ₂ , R ¹ CON, respectively.
HR ³ NHOCR ² and R ¹ CO-
And R ² CO— is a fatty acid residue and —NHR ³ NH— is a diamine residue. This fatty acid has 6 to 22 carbon atoms
Of saturated or unsaturated fatty acids are preferred.

The fatty acid amide or fatty acid bisamide has, for example, 13 to 15 carbon atoms and a molecular weight of 200 to
800, N, N'-alkylene bisamide etc. can be preferably mentioned. More specifically, N, N′-methylenebis-tothearynoic acid amide, N, N′-ethylenebispalmitic acid amide, N, N′-methylenebislauric acid amide, linoleic acid amide, caprylic acid amide, stearic acid amide Etc. can be illustrated. Among these, the bisamide represented by the following formula (I) is particularly preferably used.

[0022]

Embedded image RCONH (CH ₂ ) _n NHOCR (I) However, RCO— in the formula (I) represents a fatty acid residue, and n is 1 or 2.

These fatty acid amides and / or fatty acid bisamides are contained in the composition forming the coating film in an amount of 3 to 10%.
% By weight. If the content of the fatty acid amide and / or the fatty acid bisamide is too small, sufficient adhesive strength cannot be obtained, and the slipperiness and blocking resistance tend to be reduced. Adhesion may be reduced, the coating film may be embrittled, and haze may be increased.

[Easy-Adhesive Film] The easily-adhesive film of the present invention comprises:
A film having an easily-adhesive coating film formed of the above-mentioned aqueous polyester resin and a composition containing a fatty acid amide and / or a fatty acid bisamide as a main component, wherein the haze value of the film is 1% or less, and the friction coefficient (μs). ) Is 0.8 or less.

The easy-adhesive film having a haze value of 1% or less and a friction coefficient (μs) of 0.8 or less forms an easily-adhesive coating film containing the above composition as a main component on at least one surface of a polyester film. Can be obtained.
In particular, in order to set the friction coefficient (μs) to 0.8 or less, the center line average roughness (Ra) of the coating film surface is set to 0.002 to 0.01.
It is preferably set to μm. The easily-adhesive coating film having such a center line average roughness (Ra) can be obtained by adding 5 to 30% by weight of a surface-roughening substance having an average particle diameter of 0.15 μm or less as its constituent component. .

Examples of the surface-roughening substance include calcium carbonate, magnesium carbonate, calcium oxide, zinc oxide, magnesium oxide, silicon oxide, sodium silicate, aluminum hydroxide, iron oxide, zirconium oxide, barium sulfate and titanium oxide. , Tin oxide, antimony trioxide, carbon black, inorganic fine particles such as molybdenum disulfide, acrylic cross-linked polymer, styrene cross-linked polymer, silicone resin, fluororesin, benzoguanamine resin, phenol resin, nylon resin, polyethylene wax, etc. Examples thereof include organic fine particles. Of these, water-insoluble solid substances, in order to avoid settling in the aqueous dispersion,
It is preferable to select ultrafine particles having a specific gravity not exceeding 3.

Such a surface-roughening substance not only roughens the surface of the coating film, but also has the effect of reinforcing the coating film by the fine powder itself, and further has the function of imparting blocking resistance to the coating film, which is excellent for the film. It will give good slipperiness.

It is preferable that 5 to 30% by weight of these rough surface substances be contained in the composition forming the coating film.
Particularly, when using relatively large particles having an average particle size of 0.1 μm or more, the range is from 5 to 10% by weight, and when using particles having an average particle size of 0.01 to 0.1 μm, 8 to
It is preferable to select from within the range of 30% by weight.

The above composition used in the present invention is used in the form of an aqueous solution, an aqueous dispersion or an emulsion for forming a coating film. In order to form a coating film, a resin other than the above-mentioned aqueous polyester, an antistatic agent, a colorant, a surfactant, an ultraviolet absorber, etc. can be added, if necessary.

The coating liquid can be applied to the polyester film at any stage, but it is preferable to apply the coating liquid to the production process of the polyester film. Further, the coating liquid is applied to the polyester film before the orientation crystallization is completed. It is preferably applied.

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

When the 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 coatability, or with the coating composition. It is preferable to use a chemically inert surfactant together with this. Such a surfactant promotes wetting of the aqueous coating liquid to the polyester film, and includes, for example, polyoxyethylene alkylphenyl ether, polyoxyethylene-fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, fatty acid metal soap, Examples thereof include anionic and nonionic surfactants such as alkyl sulfates, alkyl sulfonates and alkyl sulfosuccinates.

The coating amount of the coating solution is 0.02 when the thickness of the coating film is 0.02.
The amount is preferably in the range of 0.3 μm, preferably 0.07 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 and the like can be used alone or in combination. The coating film may be formed on only one side or both sides of the film, if necessary.

[Laminate] The laminate according to the present invention can be obtained by laminating a hard coat layer on at least one surface of the easily adhesive coating of the easily adhesive film. Examples of the hard coat layer include silane-based and radiation-curable hard coat layers which are usually used, but a radiation-curable hard coat layer is particularly preferable, and a UV-curable hard coat layer is particularly preferable. It is preferably used.

Examples of the UV curable composition used for forming the hard coat layer include UV curable compositions such as urethane-acrylate, epoxy-acrylate and polyester-acrylate.

For laminating a hard coat layer on an easily adhesive coating film of an easily adhesive polyester film, the composition is applied onto the coating film, and the composition is heated, irradiated with radiation (eg, ultraviolet ray), or the like. Can be cured.

[0039]

EXAMPLES Hereinafter, 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), adhesive strength, 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 ≦ 0.5% …… very good film haze ◯: 0.5% <haze value ≦ 1.0% …… good film haze ×: 1.0% <haze value …… film haze Bad

(2) Friction coefficient (μs) According to ASTM D1894-63, using a slippery measuring instrument manufactured by Toyo Tester Co., Ltd., a coefficient of static friction between the coating film-formed surface and the polyethylene terephthalate film (non-coated surface). (Μs) was measured. However, the thread plate was a glass plate, and the load was 1 kg. The slip property of the film was evaluated according to the following criteria. ⊚: Friction coefficient (μs) ≦ 0.5 …… Extremely good sliding property ○: 0.5 <Friction coefficient (μs) ≦ 0.8 …… Good sliding property ×: 0.8 <Friction coefficient (μs) …… Poor slipperiness

(3) Center Line Average Surface Roughness (Ra) According to JIS B0601, a needle radius of 2 is obtained using a high precision surface roughness meter SE-3FAT manufactured by Kosaka Laboratory Ltd.
Draw a chart under the conditions of μm, load of 30 mg, magnification of 200,000 times and cutoff of 0.08 mm, and extract a portion of measurement length L from the surface roughness curve in the direction of its center line.
When the roughness curve is represented by Y = f (x) with the center line of the extracted portion as the X axis and the direction of longitudinal magnification and the Y axis, the value given by the following equation is represented in μm units. Further, in this measurement, four pieces were measured with a reference length of 1.25 mm and expressed as an average value.

[0043]

[Equation 1]

(4) Adhesive strength: 5 μm thick on the surface of the coating film of the easily adhesive polyester film.
m hard coat layer is formed and cross cut (100 squares of 1 mm ² ) is applied, and 24 is cut on it.
Stick a cellophane tape (made by Nichiban Co., Ltd.) with a width of mm,
After rapidly peeling at a peeling angle of 180 degrees, the peeled surface was observed and evaluated according to the following criteria. 5: Peeling area is less than 10% ...... Adhesive strength is extremely good 4: Peeling area is 10% or more and less than 20% ...... Good adhesion strength 3: Peeling area is 20% or more and less than 30% …… Adhesive strength is slightly good 2: Peeling Area is 30% or more and less than 40% ...... Adhesive strength is poor 1: Peeling area exceeds 40% ...... Adhesive strength is extremely poor

(5) 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 6 kg / cm ² thereof was applied for 17 hours in an atmosphere of 60 ° C. × 80% RH. Was applied, and then peeling was performed, and blocking resistance was evaluated according to the following criteria by the peeling force. ◎: Peeling force <10 g / 5 cm width …… very good blocking resistance ○: 10 g / 5 cm width ≦ peeling force <15 g / 5 cm width …… good blocking resistance Δ: 15 g / 5 cm width ≦ peeling force < 20 g / 5 cm width …… Slightly good blocking resistance ×: 20 g / 5 cm width ≦ peeling force …… Poor blocking resistance

[Example 1] Molten polyethylene terephthalate ([η] = 0.65) was extruded from a die, cooled by a cooling drum by a conventional method to give an unstretched film, and then stretched by a factor of 3.6 in the machine direction. After that, an aqueous liquid having a concentration of 8% of the following coating composition was uniformly applied to one surface thereof with a roll coater.

[Coating Composition] The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), and the glycol component is ethylene glycol (95 mol%). %) And neopentyl glycol (5 mol%) Copolyester (Tg = 68 ° C.) 80% by weight N, N′-ethylenebiscaprylic acid amide 5% by weight Acrylic resin fine particles (average particle size 0.03 μm) 10% by weight Polyoxyethylene nonyl phenyl ether 5% by weight

The coated film is then continued for 9
While being dried at 5 ° C., it was stretched in the transverse direction at 120 ° C. by a factor of 3.8 and heat-set at 220 ° C. to obtain an easily adhesive film having a thickness of 40 μm. The thickness of the coating film was 0.15 μm.

This easy-adhesive film had a haze value of ⊚, a slip property of ∘, and a center line average surface roughness (Ra).
Was 0.007 μm, and the blocking resistance was evaluated as ◯.

Then, a hard coat layer composition having the following composition was uniformly coated on the coating film by using a roll coater so that the film thickness after curing was 5 μm, and further 80 W /
A high-pressure mercury lamp having a strength of cm was irradiated with ultraviolet rays for 30 seconds to cure, and a laminate having a hard coat layer was obtained. This laminate had a rating of 4 on the coating surface of the hard coat layer, was excellent in transparency and slipperiness, and was good in blocking resistance.

[Hard coat layer composition] Pentaerythritol acrylate 45% by weight N-methylolacrylamide 40% by weight N-vinylpyrrolidone 10% by weight 1-Hydroxycyclohexylphenylketone 5% by weight

[Comparative Example 1] In Example 1, N, N '
-A laminated film was prepared under the same conditions as in Example 1 except that the coating composition containing no ethylenebiscaprylic acid amide was used.

The haze value, friction coefficient (μs), average surface roughness (Ra) and blocking resistance of this laminated film were the same as in Example 1, but the adhesive strength evaluated in the same manner as in Example 1 Was 2, and the adhesive strength was poor.

[Examples 2-9, Comparative Examples 2-4] Example 1
In, the easily adhesive film was obtained in the same manner as in Example 1 except that the composition of the coating composition was changed as shown in Table 1. The evaluation results of this easily adhesive film are shown in Table 2.

[0055]

[Table 1]

[0056]

[Table 2]

As is clear from the results of Example 1 and Comparative Example 1 and the results shown in Table 2, the films of the present invention (Examples 2 to 9) were transparent, slippery, adhesive, and blocking resistant. All of the properties were good, but when an aqueous polyester having a second-order transition point of more than 85 ° C. was used (Comparative Example 2),
When an aqueous polyester having poor adhesive strength and a secondary transition point of less than 40 ° C. was used (Comparative Example 3), the blocking resistance was insufficient. Moreover, when fatty acid amide and fatty acid bisamide were not included (Comparative Example 4), the adhesive strength was poor.

[Examples 10 to 13] The blending amount of N, N'-methylenebisstearic acid amide of the coating composition component was changed as shown in Table 3, and the blending amount of the aqueous polyester in the composition was changed. An easily-adhesive film was obtained in the same manner as in Example 4, except that the total content of the components was reduced to 100%. The evaluation results of this film are as shown in Table 3,
Particularly good adhesive strength and blocking resistance were obtained when the content of the fatty acid bisamide was 3 to 10% by weight (Examples 11 and 12).

[0059]

[Table 3]

[Examples 14 to 19 and Comparative Examples 5 to 8] The types and amounts of the surface-roughening substances were changed as shown in Table 4, and the amount of the aqueous polyester was changed to the total amount of the components in the composition. Was reduced to 100%, and easily adhesive films having different haze values and friction coefficients (μs) (surface roughness) were obtained in the same manner as in Example 4. The evaluation results of this film are as shown in Table 4, and when the haze value exceeds 1% (Comparative Examples 6 and 8), the transparency is poor and it is unsuitable for a surface protective material that requires transparency. there were. Also, the friction coefficient (μ
When s) was more than 0.8 (Comparative Examples 5 and 7), the slipperiness was poor and the windability, handleability and blocking resistance were insufficient. On the other hand, the haze value is 1% or less and the friction coefficient (μ
The easily adhesive films of the present invention (s) having a s) of 0.8 or less (Examples 14 to 19) exhibited good transparency and slipperiness.

[0061]

[Table 4]

In Tables 1 and 4, the symbols (P, Q, R, S, T, A, B, C, D, G, and
H, Y and Z) represent the following polymers or compounds, respectively.

[Aqueous polyester] P: acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), glycol component is ethylene glycol (95 mol%) And a copolymerized polyester of neopentyl glycol (5 mol%) (Tg = 68 ° C.)

Q: The acid component is 2,6-naphthalenedicarboxylic acid (50 mol%), terephthalic acid (46 mol%) and sodium 5-sulfoisophthalate (4 mol%), and the glycol component is ethylene glycol (70 mol%). ) And bisphenol A ethylene oxide 2 mol adduct (30 mol%) copolyester (Tg = 80 ° C.)

R: terephthalic acid (85 mol%) as the acid component
And isophthalic acid (15 mol%), glycol component is ethylene glycol (57 mol%), 1,4-butanediol (40 mol%), diethylene glycol (2 mol%) and polyethylene glycol (molecular weight 600)
Copolymerized polyester (Tg = 47 ° C.) (1 mol%)

S: acid component of terephthalic acid (70 mol%), isophthalic acid (28 mol%) and sodium 5-sulfoisophthalate (2 mol%), glycol component of ethylene glycol (70 mol%) and bisphenol A Ethylene oxide 4 mol adduct (30 mol%)
Copolyester (Tg = 30 ℃)

T: acid component is 2,6-naphthalenedicarboxylic acid (81 mol%), isophthalic acid (15 mol%) and sodium 5-sulfoisophthalate (4 mol%), glycol component is ethylene glycol (70 mol%) ) And a copolymerized polyester of bisphenol A with 2 mol of ethylene oxide (30 mol%) (Tg = 90 ° C.)

[Fatty acid amide, fatty acid bisamide] A: N, N'-ethylene biscaprylic acid amide B: N, N'-methylenebisstearic acid amide C: N, N'-ethylene bispalmitic acid amide D: Caprylic acid amide E: Stearic acid amide

[Roughening Material] G: Acrylic resin fine particles (average particle size 0.03 μm) H: Silica (average particle size 0.12 μm)

[Surfactant] Y: polyoxyethylene nonylphenyl ether Z: polyoxyethylene / polyoxypropylene copolymer [Example 20] of the easily adhesive film of the easily adhesive film obtained in Example 5 A UV curable composition having the following composition was uniformly applied onto the above using a roll coater so that the film thickness after curing would be 6 μm.

[UV Curing Composition] Pentaerythritol triacrylate 20% by weight N-methylolacrylamide 40% by weight Trimethylolpropane triacrylate 25% by weight N vinylpyrrolidone 10% by weight P-phenoxydichloroacetophenone 5% by weight Next, 80 W / 3 with a high-pressure mercury lamp with an intensity of cm
It was irradiated with ultraviolet rays for 0 seconds and cured to form a hard coat layer to obtain a laminate.

In this laminate, the hard coat layer was firmly adhered to the polyester film, and the adhesive strength was 4. This laminate had a large surface hardness, excellent abrasion resistance, and was extremely useful as a surface protective material that requires transparency.

[0073]

INDUSTRIAL APPLICABILITY According to the present invention, a polyester film having excellent adhesiveness to other layers to be used by laminating, metal, glass, etc., and also having excellent transparency and slipperiness, particularly window glass and shows. It is possible to provide an easily-adhesive polyester film suitable for a surface protective material for cases, glasses, instruments, displays, lamps and the like, and further, a hard coat layer on the easily-adhesive layer of the easily-adhesive polyester film. It is possible to provide a laminated body having improved surface hardness, wear resistance and the like.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Tomita 3-37-19 Oyama, Sagamihara-shi, Kanagawa Teijin Limited Sagamihara Research Center

Claims (8)

[Claims] 1. An easily-adhesive coating film composed of an aqueous polyester resin having a secondary transition point of 40 to 85 ° C. and a composition containing fatty acid amide and / or fatty acid bisamide as main components is formed on at least one surface of the polyester film. An easily adhesive film having a haze value of 1% or less and a friction coefficient (μs) of 0.8 or less. 2. The easily adhesive film according to claim 1, wherein the center line average roughness (Ra) of the surface of the easily adhesive film is 0.002 to 0.01 μm. 3. The easily adhesive film according to claim 2, wherein the composition contains 5 to 30% by weight of a surface-roughening substance having an average particle size of 0.15 μm or less. 4. The easily adhesive film according to claim 1, wherein the composition contains 3 to 10% by weight of fatty acid amide and / or fatty acid bisamide. 5. The easily adhesive film according to claim 1, wherein the composition contains an aqueous polyester resin and a fatty acid bisamide as main components. 6. The fatty acid bisamide has the following general formula (I):
The easily-adhesive film according to any one of claims 1 to 5, which is a fatty acid bisamide represented by: Embedded image RCONH (CH ₂ ) _n NHOCR (I) (wherein RCO— in the formula (I) represents a fatty acid residue, and n
Is 1 or 2. ) 7. An easy-adhesive film according to any one of claims 1 to 6, on at least one surface of the easy-adhesive coating film,
A laminated body in which hard coat layers are laminated. 8. The laminate according to claim 7, wherein the hard coat layer is a hard coat layer obtained by curing a radiation curable resin by irradiation with radiation.