JP2003291509A - Polyester film easily adherable to ink image receiving layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester film easily adherable to an ink receiving layer, which is excellent in adhesion to the ink image receiving layer. <P>SOLUTION: A coated layer, which is composed of a coated-layer composition, is provided at least on one side of the polyester film. The coated-layer composition is composed of: (A) copolyester of 20-60 pts.wt., which contains a dicarboxylic acid component of 1-16 mol% having a sulfonic base, with respect to the whole of a dicarboxylic acid component, and in which a second-order transition temperature is in a range of 20-90°C; (B) an antistatic agent of 10-30 pts.wt., in which sulfonic acid and/or a sulfonate group are/is provided in a molecule; (C) polyvinyl alcohol of 10-30 pts.wt., in which a saponification degree is in a range of 70-90 mol%; (D) fine particles of 3-20 pts.wt., in which an average particle diameter is in a range of 20-80 nm; and (E) a specific compound of 5-20 pts.wt., per the coated-layer composition of 100 pts.wt. in total. In the coated layer, surface energy is in a range of 50-65 mN/m, and a surface characteristic resistance value under conditions of 24°C and 55%RH is in a range from 5×10<SP>9</SP>to 1×10<SP>12</SP>. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-adhesive polyester film for an ink image receiving layer.

[0002]

2. Description of the Related Art A polyester film represented by a polyethylene terephthalate film has been widely used as a base film of a film for image receiving paper.
In recent years, with the demand for color printers, new printing methods such as inkjet methods have been developed. An image-receiving paper film for such a printing method is disclosed in, for example, Japanese Patent Laid-Open No. 64-64
As proposed in Japanese Patent No. 36479 and Japanese Patent Laid-Open No. 1-95091, it is necessary to form an ink image receiving layer on the film. The ink image-receiving layer is porous and has a good ink absorption property, but the ink image-receiving layer has poor adhesion to the polyester film used as the base film. Further, such a polyester film is easily charged. When the film is charged, dust and dirt are attached to the surface of the film, which causes quality problems. Also,
When an organic solvent is used in the film processing process, there is a risk of ignition due to discharge from the charged film.

As a measure against the problem caused by such charging,
For example, a method of kneading an anionic compound such as an organic sulfonate group, metal powder, carbon powder, etc. into a polyester film, and a method of depositing a metal compound on the surface of a polyester film have been proposed and put into practical use. However,
Such a method has problems that the transparency of the film is lowered and that the processing cost is high.

As another method, various methods for forming an antistatic coating film (sometimes referred to as a coating layer) on the film surface have been proposed and put into practical use. As the antistatic agent to be contained in the antistatic coating film, a low molecular weight type and a high molecular weight type are known, but each has its own advantages and disadvantages. Therefore, the antistatic agent is properly used depending on its characteristics. For example, as the low molecular type antistatic agent, for example,
Long-chain alkyl compound having sulfonate group (Patent Document 4)
No. 28728), a surfactant type anionic antistatic agent is known, and as a high molecular type antistatic agent, a polymer having an ionized nitrogen element in its main chain (Japanese Patent Application Laid-Open No. H03-28370). -255139, Japanese Patent Laid-Open No. 4-2
88127, JP-A-6-320390),
Sulfonate modified polystyrene (Japanese Patent Laid-Open No. 5-3203)
No. 94) is known.

However, in the antistatic coating film using a low molecular type antistatic agent, a part of the antistatic agent migrates in the coating film and accumulates at the interface, and migrates to the opposite surface of the film. However, there is a problem that the antistatic property decreases with time. On the other hand, in the antistatic coating film using a polymer type antistatic agent, it is necessary to add a large amount of antistatic agent to obtain good antistatic property, or an antistatic coating film with a large film thickness. It is not economical because it is necessary to form In addition, when a waste film that has not been made into a product (for example, a film end portion cut and removed in the manufacturing process) is collected and used as a recycled material for film manufacturing, the coating film contained in the recycled material during melt film formation is used. The film components are deteriorated by heat, and the obtained film is markedly colored and lacks in practicality (recovery is poor). Further, there are drawbacks that the films are difficult to separate from each other, in other words, blocking occurs, and the coating film is easily scraped, and its solution is desired.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an image-receiving paper for an ink-jet printer which has excellent adhesiveness to an ink image-receiving layer, water-resistant adhesiveness and bending adhesiveness, and has both antistatic property and hiding property. Another object of the present invention is to provide a useful ink image-receiving layer easy-adhesion polyester film.

[0007]

That is, according to the present invention, a coating layer comprising a coating layer composition is provided on at least one side of a polyester film, and the coating layer composition is 100 parts by weight in total of the coating layer composition. (A) 20 to 60 parts by weight of a copolyester containing 1 to 16 mol% of a dicarboxylic acid component having a sulfonate group with respect to all dicarboxylic acid components and having a second-order transition temperature of 20 to 90 ° C., (B) molecule 10 to 30 parts by weight of antistatic agent having sulfonic acid and / or sulfonate group therein, (C) Saponification degree 70 to 90 m
10 to 30 parts by weight of ol% polyvinyl alcohol,
(D) 3 to 20 parts by weight of fine particles having an average particle size of 20 to 80 nm, and (E) compound 5 represented by the following formula (I)
˜20 parts by weight, and the coating layer has a surface energy of 5
It is an ink image-receiving layer easily adhering polyester film having a surface specific resistance value of 0 to 65 mN / m and a surface specific resistance value of 5 × 10 ⁹ to 1 × 10 ¹² at 24 ° C. and 55% RH.

[0008]

[Chemical 2]

The invention will be described in detail below.

[Polyester Film] The polyester constituting the polyester film in the present invention includes, for example, an aromatic dicarboxylic acid component such as terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid and 4,4'-diphenyl dicarboxylic acid. A polyester composed of a glycol component such as ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol and 1,6-hexanediol is preferable,
Especially polyethylene terephthalate, polyethylene-2
6-naphthalene dicarboxylate is preferred. Also,
It may be a copolyester of the above components.

Polyester may contain organic or inorganic fine particles as a lubricant, if necessary, in order to improve the winding property during the production of the film and the transportability of the film during the coating of the ink image-receiving layer. Preferably. Examples of such fine particles include calcium carbonate, calcium oxide, aluminum oxide, kaolin, silicon oxide, zinc oxide, crosslinked acrylic resin particles, crosslinked polystyrene resin particles, urea resin particles, melamine resin particles, and crosslinked silicone resin particles. In addition to the fine particles, other resins such as a colorant, an antistatic agent, an antioxidant, a lubricant, a catalyst, polyethylene, polypropylene, ethylene-propylene-polymer, and an olefinic ionomer may be used within a range not impairing the transparency. It may be contained.

In the present invention, it is preferable to use a white polyester film as the polyester film.
This white polyester film can be obtained by incorporating white pigment such as titanium oxide and / or barium sulfate in polyester, for example, in an amount of 5 to 20% by weight. The white polyester film has a glossiness of 50 from the viewpoint of the clarity of printed matter when used as an image receiving paper.
The light transmittance is preferably 20% or less from the viewpoint of the design of the printed matter.

The polyester film of the present invention is
A biaxially stretched polyester film having a heat shrinkage rate of 1% or less when held at 150 ° C. for 30 minutes has good dimensional stability when a polyester film is used as an image-receiving paper, and may cause printing misalignment. It is preferable because it can be suppressed. The biaxially stretched polyester film having such a heat shrinkage has a film density of, for example, 1.390 g / cm ³ by heat setting after biaxial stretching or heat treatment at a temperature not lower than the glass transition temperature (Tg) of polyester. It can be obtained by the above.

[Coating Layer] In the present invention, a coating layer comprising a coating layer composition is provided on at least one side of the polyester film. In other words, the coating film made of the coating layer composition is laminated on at least one surface of the polyester film.

The coating layer composition is 100 in total of the coating layer composition.
1 to 16 mol% of the dicarboxylic acid component having a sulfonate group based on (A) the total dicarboxylic acid component per part by weight.
20 to 60 parts by weight of a copolyester having a second-order transition temperature of 20 to 90 ° C., and (B) an antistatic agent having a sulfonic acid and / or a sulfonate group in the molecule 10 to 3
0 parts by weight, (C) 10 to 30 parts by weight of polyvinyl alcohol having a saponification degree of 70 to 90 mol%, and (D) an average particle size of 2
3 to 20 parts by weight of fine particles of 0 to 80 nm, and (E)
It comprises 5 to 20 parts by weight of a compound represented by the following formula (I).

[0016]

[Chemical 3]

When the content of the copolyester (A) in the coating layer composition is less than 20 parts by weight, the adhesiveness with the polyester film is insufficient, and when it exceeds 60 parts by weight, the adhesiveness with the ink image receiving layer is deteriorated.

When the content ratio of the antistatic agent (B) in the coating layer composition is less than 10 parts by weight, the antistatic property is insufficient and 3
If the amount exceeds 0 part by weight, the water-resistant adhesiveness with the ink image-receiving layer is deteriorated.

When the content of the polyvinyl alcohol (C) in the coating layer composition is less than 10 parts by weight, the adhesiveness to the ink image receiving layer is insufficient, and when it exceeds 30 parts by weight, the blocking resistance is lowered.

When the content ratio of the fine particles (D) in the coating layer composition is less than 3 parts by weight, the slipperiness (transportability) of the film is insufficient, and when it exceeds 20 parts by weight, the sharpness is deteriorated.

When the content of the compound (E) in the coating layer composition is less than 5 parts by weight, the adhesion to the ink image receiving layer after printing by an ink jet printer is insufficient, and when it exceeds 20 parts by weight, the blocking resistance is lowered. However, the adhesiveness with the polyester film is reduced.

[Copolyester (A)] In the present invention, the dicarboxylic acid component having a sulfonate group is contained in an amount of 1 to 16 mol% with respect to the total dicarboxylic acid component, and the second-order transition temperature is 20 to 90 ° C. Use copolyester.

The copolyester (A) is obtained by copolymerizing polyester having a dicarboxylic acid component and a diol component with a dicarboxylic acid having a sulfonate group.
Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, hexahydroterephthalic acid, 4,4'-diphenyldicarboxylic acid, phenylindanedicarboxylic acid, adipic acid and sebacic acid. . Examples of the diol component include ethylene glycol, diethylene glycol, neopentylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, and an alkylene oxide adduct of bisphenol-A. it can. Examples of the dicarboxylic acid having a sulfonic acid group include 5-Nasulfoisophthalic acid, 5-Ksulfoisophthalic acid, and 5-Ksulfoterephthalic acid.

In the copolyester (A), the dicarboxylic acid component having a sulfonate group is copolymerized mainly for the purpose of imparting hydrophilicity to the polyester, and is preferably 1 to 16 mol% based on the total dicarboxylic acid component. Is 1.
It is copolymerized in the range of 5 to 14 mol%. If it is less than 1 mol%, the hydrophilicity of the copolyester will be insufficient, and if it exceeds 16 mol%, the moisture resistance of the coating film will decrease.

The second-order transition temperature (Tg) of the copolyester (A) is 20 to 90 ° C, preferably 25 to 80 ° C. If the Tg is less than 20 ° C, the film tends to be blocked, and if the Tg exceeds 90 ° C, the sharpness and adhesiveness of the film deteriorate.

The copolyester (A) is used as an aqueous solution, an aqueous dispersion or an emulsion.

[Antistatic Agent (B)] As the antistatic agent (B) having a sulfonic acid and / or a sulfonate group in the molecule used in the present invention, a conventionally known low molecular weight antistatic agent or high-molecular antistatic agent is used. Molecular antistatic agents can be used.

For example, metal alkyl sulfonates, metal alkyl benzene sulfonates, metal alkyl diphenyl ether disulfonates, acrylic copolymers having sulfonic acid and / or metal sulfonate groups, vinyl copolymers (eg polystyrene copolymers). ) Can be mentioned. These may be used alone or in combination of two or more.

[Polyvinyl alcohol (C)] The polyvinyl alcohol (C) used in the present invention has a saponification degree of 70.
~ 90 mol%. Saponification degree is 70 mol%
If it is less than 90%, the moisture resistance of the coating film is lowered, and if it exceeds 90 mol%, the adhesion to the ink image receiving layer is lowered.

[Fine Particle (D)] The fine particle (D) used in the present invention is an inorganic or organic fine particle having a particle size of 20.
.About.80 nm. If the particle size of the fine particles is less than 20 nm, the film tends to be blocked, and if it exceeds 80 nm, the sharpness decreases.

Examples of inorganic fine particles include fine particles of calcium carbonate, calcium oxide, aluminum oxide, kaolin, silicon oxide and zinc oxide. Examples of the organic fine particles include crosslinked acrylic resin particles, crosslinked polystyrene resin particles, melamine resin particles, and crosslinked silicone resin particles.

[Compound (E)] The compound (E) used in the present invention is represented by the following chemical formula (I).

[0033]

[Chemical 4]

If any other epoxy compound is used, the adhesion to the ink image receiving layer will be insufficient.

[Surface Energy, Surface Resistivity] The coating layer of the present invention has a surface energy of 50 to 65.
mN / m, preferably 52-60 mN / m. If the surface energy is less than 50 mN / m, the coating property and adhesiveness of the water-based ink image receiving layer will be poor, resulting in 65 mN / m.
If it exceeds, the adhesion to the polyester film as the substrate may be insufficient, or the moisture resistance of the coating film may be insufficient.

Further, the coating layer in the present invention is 24
Surface resistivity at 55 ° C and 55% RH is 5 × 10 ⁹ to 1 ×
It is 10 ¹² , preferably 5 × 10 ⁹ to 2 × 10 ¹¹ . If the surface specific resistance is less than 5 × 10 ⁹ , it will slip too much when the sheets are piled up after processing after processing, and the end faces will be easily misaligned. If it exceeds 1 × 10 ¹² , antistatic properties will be insufficient and After the dust is attached and processed, the transportability of the sheets is insufficient.

A coating layer satisfying the above conditions for surface energy and surface resistivity is obtained by laminating a coating layer of the coating layer composition of the present invention on the film in a thickness of, for example, 0.02 to 1 μm. be able to.

[Production Method] [Aqueous Coating Liquid] In the present invention, the coating layer is formed by coating an aqueous coating liquid containing the above coating layer composition on at least one side of a polyester film, followed by drying and stretching. . The aqueous coating liquid to be used is one in which water is used as a medium and the composition of the above components is dissolved and / or dispersed. The aqueous coating liquid may contain a small amount of organic solvent for the purpose of helping the stability of the coating liquid. As this organic solvent,
Methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, dioxane, cyclohexanone, n-hexane, toluene, xylene, methanol, ethanol,
Examples are n-propanol and isopropanol. Plural kinds of organic solvents may be contained.

In the present invention, the water-based coating liquid contains other surfactants, ultraviolet absorbers, pigments, lubricants, antiblocking agents, water-soluble polymer resins, oxazolines, and melamines, as long as the object of the present invention is not impaired. Further, a crosslinking agent such as epoxy or aziridine, or an additive such as other antistatic agent can be blended.

The solid content concentration in the aqueous coating liquid in the present invention is usually 30% by weight or less, preferably 10% by weight.
It is the following.

[Coating of Coating Layer] In the present invention, the above-mentioned aqueous coating solution is coated on at least one side of a polyester film, and a polyester film before completion of crystal orientation is preferable as this film. As the polyester film before the completion of the oriented crystals, an unstretched film obtained by heat-melting polyester as it is, a uniaxially stretched film obtained by stretching the unstretched film in either the longitudinal direction or the transverse direction, A biaxially-stretched film that can be further stretched by stretching the stretched film in the machine direction and the transverse direction at a low ratio (finally re-stretched in the machine direction and the transverse direction to complete oriented crystallization. A film) can be illustrated. Of these, a uniaxially stretched film obtained by stretching the unstretched film in the machine direction (extrusion direction) is preferable.

If the polyester film is coated with the aqueous coating solution in a step separated from the manufacturing process of the film which has been biaxially stretched and heat-fixed, it is not preferable because it is easy to get rid of litter, dust and the like. From this point of view, coating in a clean atmosphere, that is, coating in the film manufacturing process is preferable. According to this coating, the adhesion of the coating layer to the polyester film is further improved.

As the method for applying the aqueous coating solution to the polyester film, any known coating method can be applied. For example, roll coating method, gravure coating method, micro gravure coating method, reverse coating method, roll brushing method,
The spray coating method, the air knife coating method, the impregnation method and the curtain coating method may be applied individually or in combination.

The coating amount is preferably 0.5 to ²⁰ g, more preferably 1 to 10 g per 1 m ² of the running film. The aqueous liquid is preferably used as an aqueous dispersion or emulsion.

The thickness of the polyester film after such treatment is preferably 50 to 150 μm. The thickness of the final dry coating film (coating layer) is preferably 0.0
It is 2-1 μm. If the thickness of the coating film is less than 0.02 μm, the antistatic property is insufficient, and if it exceeds 1 μm, the blocking resistance is deteriorated. The coating can be carried out on only one side or on both sides depending on the intended use of the film. After coating, a uniform coating film is obtained by drying.

In the present invention, after the aqueous coating liquid is applied to the polyester film, it is dried, preferably stretched. This drying is preferably performed at 90 to 130 ° C. for 2 to 20 seconds. This drying can also serve as a preheat treatment for the stretching treatment or a heat treatment during the stretching. The stretching treatment of the polyester film is performed at a temperature of 90 to 130 ° C. in the longitudinal direction of 3 to
5 times, 3 to 5 times in the horizontal direction, and 1 to 3 times in the vertical direction if necessary, and 2 to 20 at 180 to 240 ° C for heat setting.
Seconds.

The heat setting treatment after stretching is preferably carried out at a temperature higher than the final stretching temperature and lower than the melting point for 1 to 30 seconds.

[0048]

EXAMPLES The present invention will be further described below with reference to examples. Each characteristic value was measured by the following method.

1. On the surface of the coating layer of the adhesive film before printing, spherical silica (average particle diameter 18 μ,
Average pore diameter 200 Å, average pore volume 1.
5 cc / g) 70% by weight and polyvinyl alcohol (PVA 117 manufactured by Kuraray) 30% by weight are applied to form an aqueous slurry having a dry thickness of 20 μm and a width of 12.7 m.
m, 150 mm long scotch tape (No. 600, manufactured by 3M Co., Ltd.) was adhered so that air bubbles did not enter, and after this was smoothed with a manual load roll described in JIS C2701 (1975) and brought into close contact, Cut to tape width. When the Scotch tape is peeled from the sample thus prepared, the peeling state of the ink image receiving layer from the polyester film is observed to evaluate the adhesiveness as follows. A: No peeling was observed at all, and the adhesion was good. B: Slight peeling was observed at the foreign substance portion. C: Peeling was noticeable.

2. After printing, spherical silica (average particle size 18μ, on the coating layer surface of the adhesive film,
Average pore diameter 200 Å, average pore volume 1.
5 cc / g) 70 wt% and polyvinyl alcohol (PVA 117 made by Kuraray) 30 wt% were mixed to form an aqueous slurry having a dry thickness of 20 μm, and an ink jet printer (PM-750C made by EPSON) was used to apply it on a digital camera. The photographed image is taken into a personal computer, printed, and a Scotch tape with a width of 12.7 mm and a length of 150 mm (No. 600 manufactured by 3M Co., Ltd.) is adhered onto the print so that air bubbles do not enter, and JIS C2701 is put on this. (1
975) described above, it is smoothed by using a manual load roll described in 975) and brought into close contact, and then cut into a tape width. When the Scotch tape is peeled from the sample thus prepared, the peeling state of the ink image receiving layer from the polyester film is observed to evaluate the adhesiveness as follows. A: No peeling was observed at all, and the adhesion was good. B: Slight peeling was observed at the foreign substance portion. C: Peeling was noticeable.

3. Water-Resistant Adhesion Resistance With respect to the above-mentioned adhesiveness-evaluated products, gauze is soaked with water from above the ink image-receiving layer, rubbed, and how many times the ink image-receiving layer falls off is evaluated as follows. A: 50 times or more ... Extremely good water resistant adhesion B: 30 to 50 times ... Good water resistant adhesion C: Less than 30 times ... Poor water resistant adhesion

4. Surface resistivity (antistatic property) The surface resistivity of the sample film is measured by Takeda Riken.
Using a specific resistance measuring instrument, measuring temperature 24 ℃, measuring humidity 55
%, The surface specific resistance value (Ω / □) after 1 minute at an applied voltage of 100 V is measured. The surface resistivity is 1 x
It is preferably 10 ¹² [Ω / □] or less, more preferably 2 × 10 ¹¹ or less.

5. Friction coefficient According to ASTM D1894-63, a slipper measuring device manufactured by Toyo Tester Co., Ltd. is used, the front surface and the back surface of the film are aligned, and a static friction coefficient is measured by applying a load of 1 kg. When the coefficient of friction exceeds 0.6, the film transportability is impaired.

6. Blocking property Two films cut into 50 mm width are stacked and 4.9MP
After treating at 40 ° C. × 50% RH × 17 hours under load of a,
Peel strength (g / 5
0 mm) is measured. The peel strength is evaluated as follows. Peel strength ≦ 10 g / 50 mm ... Good blocking property 10 g / 50 mm <Peel strength ≦ 30 g / 50 mm ... Slightly good blocking property 30 g / 50 mm <Peel strength ... Poor blocking property

7. Surface Energy WA Zisman: “Contact Augle, Wettability and Adh
esion ", Am. Chem. Soc., (1964), the surface energy is defined as the critical surface tension γc measured.

8. The second-order transition temperature is measured by a thermal analysis type DuPont Thermal Analyst 2000 differential calorimeter at a heating rate of 20 ° C./min.

9. Intrinsic viscosity The viscosity of the solution with the ortho-chlorophenol solvent is set to 35 ° C.
Measure and obtain at.

10. Moisture resistance In the evaluation of the blocking property, the treatment condition is 60 ° C.
The peel strength (g / 50 mm) was measured by the same method except that the time was set to × 70% RH × 17 hours. The measurement results are evaluated as follows. Peel strength ≦ 10 g / 50 mm… Good humidity resistance 10 g / 50 mm <Peel strength ≦ 30 g / 50 mm… Slightly good humidity resistance 30 g / 50 mm ≦ Peel strength… Poor moisture resistance

11. Gloss degree Gs (60 °) It is measured according to JIS Z 8741-1962 using a gloss meter GM-3D manufactured by Murakami Color Research Laboratory.
The measurement angle is 60 °, the number of measurements is n = 5, and the average value thereof is the value of gloss Gs (60 °).

12. Light transmittance is measured by Murakami Color Research Laboratory HR-100 type haze meter according to ASTM D1003.

13. Heat shrinkage rate The heat shrinkage rate of the film after heat treatment at 150 ° C for 30 minutes is measured at a gauge length of 30 cm.

14. Regarding the film coated with the clear ink image receiving layer, the image taken by a digital camera with an inkjet printer (PM-750C manufactured by EPSON) was taken into a personal computer, printed, and the sharpness of the printed matter was visually observed, and evaluated as follows. To do. A: The printing is extremely clear and good ... The sharpness is very good B: The printing is very good ... The sharpness is very good C: The printing is unclear and the sharpness is poor ...・ Poor clarity

Example 1 Polyethylene terephthalate (PET) having an intrinsic viscosity (orthochlorophenol, 35 ° C.) of 0.65 and containing 0.01 wt% of porous SiO ₂ having a particle size of 1.7 μm was prepared at 20 ° C. Melt-extruded on a rotary cooling drum maintained at to obtain an unstretched film, and then stretching the unstretched film by 3.6 times in the machine axis direction, the acid components were terephthalic acid (67 mol%) and isophthalic acid ( Two
7 mol%) and 5-Na sulfoisophthalic acid (6 mol%), the glycol component is ethylene glycol (30 mol%), diethylene glycol (40 mol%) and neopentyl glycol (30 mol%) Copolyester (Tg = 51 ° C, hereinafter simply referred to as (F)) 3
8% by weight, methyl methacrylate (49 mol%), acetonitrile (1 mol%), Na methallyl sulfonate (50
Mol%) (an average molecular weight: 5400)
0, hereinafter referred to simply as (N)) 20% by weight, saponification degree 8
15% by weight of polyvinyl alcohol of 6 to 89 mol%, 10% by weight of crosslinked acrylic resin particles having an average particle size of 40 nm, 8% by weight of compound (X) represented by the following formula (I-1) and 9% by weight of polyoxyethylene lauryl ether. % Aqueous solution having a solid content concentration of 4% by weight was applied by a roll coater. Then, the longitudinally stretched film coated with the aqueous liquid is stretched 4 times in the transverse direction while being dried, and further at 230 ° C.
Heat fixing was performed to obtain a 100 μm-thick ink-image-receiving layer easy-adhesion polyester film.

[0064]

[Chemical 5]

The film thickness of this film is 0.04 μm.
m, the centerline average surface roughness was 15 nm, the surface energy was 57 mN / m, and the thermal shrinkage was 0.9% in the vertical direction and 0.2% in the horizontal direction. The characteristics of this film are shown in Table 1.

[Comparative Example 1] Except that the aqueous liquid was not applied,
In the same manner as in Example 1, an easily adhering polyester film for the ink image receiving layer was obtained. The characteristics of this film are shown in Table 1.

[Examples 2 to 7] Ink image-receiving layer easily adhesive polyester films were obtained in the same manner as in Example 1 except that the type and ratio of the coating agent were changed as shown in Table 1. The characteristics of this film are shown in Table 1. As is clear from the results shown in Table 1, the ink image-receiving layer easy-adhesion polyester film of the present invention has excellent adhesiveness.

[0068]

[Table 1]

In Table 1, F and G of the copolyester types (Note 1) are as follows.

F: terephthalic acid (67 mol%), isophthalic acid (27 mol%), 5-Na sulfoisophthalic acid (6 mol%) / ethylene glycol (30 mol%), diethylene glycol (40 mol%), neopentyl Copolyester of glycol (30 mol%) (Tg = 5
1 ° C) G: terephthalic acid (60 mol%) / isophthalic acid (30
Mol%)-5-K sulfoterephthalic acid (10 mol%) /
Ethylene glycol (30 mol%), 1,4-butanediol (50 mol%), neopentyl glycol (20
Mol%) Copolymer (Tg = 40 ° C.) In Table 1, N, O and P of the antistatic agent types (Note 2) are as follows.

N: Methyl methacrylate (49 mol%)
Acetonitrile (1 mol%) / Na methallyl sulfonate
(50 mol%) antistatic agent (average molecular weight: 54
000) O: Na polystyrene sulfonate (Chemistad SA-
9, manufactured by Sanyo Chemical Co., Ltd. P: Polystyrene sulfonic acid (Versa TL72,
Made by NSC Japan)

In Table 1, Q, R and S of polyvinyl alcohol type (Note 3) are as follows. Q: Polyvinyl alcohol having a saponification degree of 86 to 89 mol% R: Polyvinyl alcohol having a saponification degree of 74 to 78 mol% S: Polyvinyl alcohol having a saponification degree of 92 to 95 mol%

In Table 1, T of the type of fine particles (Note 4)
And U are as follows. T: Crosslinked acrylic particles having an average particle size of 40 nm U: Colloidal silica particles having an average particle size of 80 nm

In Table 1, X of compound type (Note 5)
And Y are as follows. X: a compound represented by the following chemical formula (I-1)

[0075]

[Chemical 6]

Y: Compound represented by the following chemical formula (I-2)

[0077]

[Chemical 7]

[Examples 8 to 11 and Comparative Examples 2 and 3] Examples except that the types of copolyester (A) were changed as shown in Tables 2 and 3 and copolyesters having different glass transition temperatures were used. In the same manner as in 1, an ink image-receiving layer easily adhesive polyester film was obtained. The characteristics of the obtained film are shown in Table 2.

[0079]

[Table 2]

[0080]

[Table 3]

As is clear from the results shown in Table 2, the ink-image-receiving layer easy-adhesion polyester film of the present invention is excellent in blocking resistance and adhesion.

Examples 12 to 16 and Comparative Examples 4 and 5 The same as Example 1 except that the ratio of the dicarboxylic acid component containing the sulfonate group of the (A) copolyester was changed as shown in Table 4. A biaxially stretched polyester film was obtained. The characteristics of the obtained film are shown in Table 4.

[0083]

[Table 4]

As is clear from the results shown in Table 4, the ink-image-receiving layer easy-adhesion polyester film of the present invention has excellent moisture resistance and adhesiveness.

[Examples 17-22 and Comparative Examples 6-1
2] Example 1 except that the ratios of copolyester (A), antistatic agent (B), polyvinyl alcohol (C), fine particles (D) and compound (E) were changed as shown in Table 5.
In the same manner as in (1), an ink image-receiving layer easily adhesive polyester film was obtained. The characteristics of the obtained film are shown in Table 5.

[0086]

[Table 5]

As is clear from the results shown in Table 5, the ink-image-receiving layer easily adhering polyester film of the present invention has excellent adhesiveness and transportability.

[Examples 23 and 24 and Comparative Examples 13 and 1]
4] An ink image-receiving layer easy-adhesion polyester film was obtained in the same manner as in Example 1 except that the particle size of the fine particles (D) was changed as shown in Table 6. The properties of the obtained film are shown in Table 6.

[0089]

[Table 6]

As is clear from the results shown in Table 6, the ink-image-receiving layer easily adhesive polyester film of the present invention is excellent in blocking resistance.

[Examples 25 and 26 and Comparative Examples 15 and 1
6] Example 1 except that the ratios of the copolyester (A), the antistatic agent (B), the polyvinyl alcohol (C), the fine particles (D) and the compound (E) were changed as shown in Table 7.
A polyester film for easily adhering the ink image-receiving layer was obtained in the same manner as in. The properties of the obtained film are shown in Table 7.

[0092]

[Table 7]

As is clear from the results shown in Table 7, the ink-image-receiving layer easy-adhesion polyester film of the present invention is excellent in adhesiveness and transportability.

Example 27 A composition comprising 90% by weight of polyester (intrinsic viscosity 0.62) consisting of terephthalic acid component and ethylene glycol component and 10% by weight of titanium oxide was placed on a rotary cooling drum which was maintained at 20 ° C. After melt-extruding to obtain an unstretched film, and then stretching the unstretched film 3.6 times in the machine axis direction, the acid components were terephthalic acid (67 mol%), isophthalic acid (27 mol%) and 5-Na. Copolymerized polyester (Tg = 30 mol%) containing sulfoisophthalic acid (6 mol%), glycol component ethylene glycol (30 mol%), diethylene glycol (40 mol%) and neopentyl glycol (30 mol%)
51 ° C., hereinafter simply referred to as (F) 38% by weight, methyl methacrylate (49 mol%), acetonitrile (1 mol%), Na methallyl sulfonate (50 mol%) antistatic agent (average molecular weight: 54000, hereinafter, simply referred to as (N)) 20% by weight, saponification degree 86 to 89 mol%
15% by weight of polyvinyl alcohol, average particle size 40 nm
10% by weight of crosslinked acrylic resin particles of the following formula (I-1)
An aqueous liquid having a composition of 8% by weight of the compound (X) and 9% by weight of polyoxyethylene lauryl ether and having a solid content concentration of 4% by weight was applied by a roll coater.
Then, the longitudinally stretched film coated with the aqueous liquid was stretched 4 times in the transverse direction while being dried, and was further heat-set at 230 ° C. to a thickness of 1
A biaxially stretched film of 00 μm was obtained. The thickness of the coating layer of this film is 0.04 μm, the glossiness is 62, the light transmittance is 3%, the heat shrinkage is 0.9% in the longitudinal direction and 0.2 in the lateral direction.
%, Sharpness and adhesiveness were good.

[0095]

[Chemical 8]

[0096]

INDUSTRIAL APPLICABILITY According to the present invention, an ink image-receiving sheet useful for an image-receiving sheet for an ink jet printer, which has excellent adhesiveness to an ink image-receiving layer, water-resistant adhesiveness and bending adhesiveness, and also has antistatic property and hiding property. A layer-adhesive polyester film can be provided.

Continued front page    (72) Inventor Koji Kubo             3-37-19 Oyama, Sagamihara City, Kanagawa Prefecture             People DuPont Films Co., Ltd. Sagamihara Research Center             In the center F-term (reference) 2H086 BA01 BA15 BA19 BA31 BA35                       BA36 BA41 BA43 BA45                 4F006 AA35 AB16 AB20 AB24 AB32                       AB34 AB35 AB39 AB66 AB73                       AB74 BA13 CA10                 4F100 AA20 AH07B AH07K AK21B                       AK41A AK41B AK42 AL01B                       AL05B BA02 BA07 CA22B                       DE01B EH46B EJ38 GB90                       JA05B JL11 JN02 JN21                       YY00B

Claims (5)

[Claims] 1. A coating layer comprising a coating layer composition is provided on at least one side of a polyester film, and the coating layer composition is (A) per 100 parts by weight of the total coating layer composition.
20 to 60 parts by weight of a copolyester containing 1 to 16 mol% of a dicarboxylic acid component having a sulfonate group with respect to all dicarboxylic acid components and having a second-order transition temperature of 20 to 90 ° C., (B) a sulfone in the molecule. 10 to 30 parts by weight of an antistatic agent having an acid and / or a sulfonate group, (C) polyvinyl alcohol 10 having a saponification degree of 70 to 90 mol%
˜30 parts by weight, (D) 3 to 20 parts by weight of fine particles having an average particle size of 20 to 80 nm, and (E) 5 to 20 parts by weight of a compound represented by the following formula (I). Is 50 to 65 mN / m, 24 ° C., 55
An ink-receptive layer easy-adhesion polyester film having a surface resistivity of 5 × 10 ⁹ to 1 × 10 ¹² in% RH. [Chemical 1] 2. A polyester film having a gloss of 5
The easily adhesive polyester film for an ink image-receiving layer according to claim 1, which is a white polyester film having a light transmittance of 0 or more and a light transmittance of 20% or less and being white. 3. A polyester film, which is 3 at 150 ° C.
The easily adhering polyester film for an ink image receiving layer according to claim 1, which is a biaxially stretched polyester film having a heat shrinkage rate of 1% or less when held for 0 minutes. 4. The ink-image-receiving layer easily adhering polyester film according to claim 2, which further comprises an aqueous ink image-receiving layer provided on the coating layer. 5. The easily adhering polyester film for an ink image receiving layer according to claim 4, which is used for an image receiving paper for an ink jet printer.