JP2001150802A - Polyester film easily bondable to ink receiver layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester film easily bondable to an ink image receiving paper or an ink receiver layer, which is prominent in concealing property and a bondability to an aqueous ink receiver layer, used for an ink jet printer or the like. SOLUTION: The polyester film easily bondable to an ink receiver layer is characterized in a constitution that a coated film, laminated on at least one side of the polyester film, is constituted of (A) 30-80 wt.% of copolymer in which the rate of dicarbonic acid constituent having sulfonic acid base with respect to the total dicarbonic acid constituent is 6-15 mol% and having a secondary transition point of 20-40 deg.C, (B) 15-45 wt.% of polyvinyl alcohol having the degree of saponification of 70-90 mol%, (C) 3-25 wt.% of fine particles having an average particle size of 20-80 nm, (D) 5-20 wt.% of a compound, shown by formula (I), wherein R is formula (II), formula (III), or formula (IV), while the surface energy of the coated film is 50-65 mN/m.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester film having an ink-receiving layer, which is easy to adhere to, and more particularly, to an image-receiving paper having excellent concealing properties and excellent water-resistant adhesion and folding adhesion to an aqueous ink-receiving layer of an ink jet printer or the like. The present invention relates to an ink-receiving layer easy-to-adhesive polyester film useful for the present invention.

[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 an image receiving paper.
In recent years, with the demand for color printers, new printing methods such as an ink jet method have been developed. An image receiving paper film for such a printing method is disclosed in JP-A-64-364.
No. 79 and Japanese Patent Application Laid-Open No. 1-95091, it is necessary to form an ink image receiving layer on a film. As the ink image receiving layer, a porous material having good ink absorbability is used, but the ink image receiving layer has poor adhesion to a polyester film used as a base film.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink-receiving layer having excellent adhesiveness and concealing properties.
An object of the present invention is to provide an ink-receiving layer easy-adhesion polyester film useful for an image-receiving paper for an ink-jet printer.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
According to the present invention, there is provided a film obtained by laminating a coating film on at least one side of a polyester film, wherein the coating film has (A) a proportion of a dicarboxylic acid component having a sulfonic acid group to all carboxylic acid components of 6 to 15 mol. % And a secondary transition point of 20 to 40 ° C.
(B) 15 to 45% by weight of polyvinyl alcohol having a saponification degree of 70 to 90 mol%, (C) 3 to 25% by weight of fine particles having an average particle diameter of 20 to 80 nm, and (D)
A component comprising 5 to 20% by weight of a compound represented by the following formula (I) as a main component, and having a surface energy of 50 to 6
This is achieved by an ink-receiving layer easy-adhesion polyester film, which is characterized by having a viscosity of 5 mN / m.

[0005]

Embedded image

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

[Polyester Film] The polyester constituting the polyester film of the present invention is a thermoplastic polyester, such as terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, and 4,4'-polyester.
Polyester composed of an aromatic dicarboxylic acid component such as diphenyldicarboxylic acid and a glycol component such as ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, and 1,6-hexanediol is preferable. Particularly, polyethylene terephthalate and polyethylene-2,6-naphthalene dicarboxylate are preferred. Further, a copolymerized polyester such as the above components may be used.

If necessary, organic or inorganic fine particles as a lubricant may be added to the polyester in order to improve the winding property in the production of the film and the transport property of the film in coating the ink image receiving layer. It is preferable to include them. 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, crosslinked silicone resin particles, and the like. In addition to the fine particles, colorants, antistatic agents, antioxidants, lubricants, catalysts, and other resins such as polyethylene, polypropylene, ethylene-propylene-polymer, and olefinic ionomers also exert the mechanical properties of the polyester film. It can be arbitrarily contained within a range not to impair.

Further, it is preferable to use a polyester film (white polyester film) having a gloss of 50 or more and a light transmittance of 20% or less and white as the polyester film in the present invention. This white polyester film is obtained by adding a white pigment such as titanium oxide and / or barium sulfate to the polyester, for example, for 5 to 2 hours.
It can be obtained by containing 0% by weight. The white polyester film preferably has a gloss of 50 or more from the sharpness of the printed matter when used as an image receiving paper, and preferably has a light transmittance of 20% or less from the design of the printed matter.

[0010] The polyester film in the present invention comprises:
A biaxially stretched film having a heat shrinkage 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 suppresses print misalignment and the like. It is preferable because it is possible. A biaxially stretched film having such a heat shrinkage is obtained by, for example, setting the film density to 1.390 g / cm ³ or more by heat setting or heat treatment at a temperature of Tg or more of polyester after biaxial stretching. be able to.

[(A) Copolyester] In the present invention, the ratio of (A) the dicarboxylic acid component having a sulfonic acid group to all dicarboxylic acid components on at least one surface of the polyester film is 6 to 15 mol%, and A copolyester having a next transition point of 20 to 40 ° C. (hereinafter abbreviated as “(A) copolyester”); (B) a polyvinyl alcohol having a saponification degree of 70 to 90 mol% (hereinafter abbreviated as “(B) polyvinyl alcohol”) Yes), (C)
Component comprising fine particles having an average particle diameter of 20 to 80 nm (hereinafter abbreviated as “(C) fine particles”) and (D) a compound represented by the formula (I) (hereinafter abbreviated as “(D) compound”) Is laminated.

The (A) copolyester used as a component for forming this coating film includes terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, hexahydroterephthalic acid, 4,4'-diphenyldicarboxylic acid, and phenylindanedicarboxylic acid. Acid, adipic acid, sebacic acid,
Dicarboxylic acid components such as 5-sulfoisophthalic acid, trimellitic acid, and dimethylolpropionic acid; and dicarboxylic acid components having sulfonic acid groups such as 5-Na sulfoisophthalic acid, 5-K sulfoisophthalic acid, and 5-K sulfoterephthalic acid And ethylene glycol, diethylene glycol, neopentylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, glycerin, trimethylolpropane, alkylene oxide adducts of bisphenol-A, etc. A copolyester composed of a hydroxy compound component and used as an aqueous solution, aqueous dispersion or emulsion.

(A) The copolyester contains a dicarboxylic acid component having a sulfonic acid group for imparting hydrophilicity in an amount of 6 to 15 mol% based on all dicarboxylic acid components in the molecule.
It must be copolymerized. The upper limit of the copolymerization ratio of the dicarboxylic acid component having a sulfonate group is preferably 14 mol%, and the lower limit is preferably 7 mol%. If the content of the dicarboxylic acid component having a sulfonic acid salt group is less than 6 mol%, the hydrophilicity of the (A) copolyester is insufficient, while if it exceeds 16 mol%, the moisture resistance of the coating film is undesirably reduced.

The (A) copolyester must have a secondary transition point (Tg) of 20 to 40 ° C. The upper limit of the secondary transition point (Tg) is preferably 35 ° C., and the lower limit is preferably 25 ° C. Tg is 20
When the temperature is lower than 40 ° C., the film is easily blocked, while
C. is not preferred, since the bending adhesion of the ink receiving layer is lowered.

[(B) Polyvinyl Alcohol] The polyvinyl alcohol (B) used as a component for forming a coating film in the present invention must have a saponification degree of 70 to 90 mol%. If the degree of saponification is less than 70 mol%, the moisture resistance of the coating film decreases, while if it exceeds 90 mol%, the adhesiveness to the ink image receiving layer decreases, which is not preferable.

[(C) Fine Particles] The (C) fine particles used as a component for forming a coating film in the present invention are organic or inorganic fine particles having an average particle diameter of 20 to 80 nm.
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, melamine resin particles, crosslinked silicone resin particles, and the like. (C) If the particle size of the fine particles is less than 20 nm, the film is likely to be blocked, while if it exceeds 80 nm, the shaving property is undesirably reduced.

[Compound (D)] The compound (D) used as a component for forming a coating film in the present invention is a compound represented by the following formula (I). Adhesion with the layer is sufficient.

[0018]

Embedded image

[Coating film] In the present invention, (A) copolyester, (B) polyvinyl alcohol,
The mixing ratio of (C) the fine particles and the (D) compound is as follows: (A) 30 to 80% by weight of the copolyester, (B) 15 to 45% by weight of the polyvinyl alcohol, and (C) 3 to 35% by weight of the fine particles.
% By weight, and 5 to 20% by weight of the compound (D). (A)
If the proportion of the copolyester component is less than 30% by weight, the adhesion of the coating film to the polyester film is insufficient, while if it exceeds 80% by weight, the adhesion between the coating film and the ink image receiving layer is undesirably reduced. When the proportion of the (B) polyvinyl alcohol component is less than 15% by weight, the adhesion between the coating film and the ink image-receiving layer is insufficient. On the other hand, when the proportion exceeds 45% by weight, the blocking resistance of the film is undesirably reduced. Also,
If the proportion of the fine particle component (C) is less than 3% by weight, the lubricity (transportability) of the film will be insufficient, while if it exceeds 25% by weight, the abrasion of the coating film will be undesirably reduced. When the proportion of the compound component (D) is less than 5% by weight, the adhesion to the ink image-receiving layer after printing by an ink jet printer is insufficient. On the other hand, when the proportion exceeds 20% by weight, the blocking resistance of the film decreases, It is not preferable because the adhesion to the polyester film is reduced.

The coating film of the present invention needs to have a surface energy of 50 to 65 mN / m. The upper limit of the surface energy is particularly preferably 60 mN / m, and the lower limit is particularly preferably 52 mN / m. If the surface energy is less than 50 mN / m, the coating properties and adhesion of the aqueous ink image-receiving layer will be poor, and if it exceeds 65 mN / m, the adhesion to the polyester film as the substrate will be insufficient, It is not preferable because moisture resistance may be insufficient.

The coating having a surface energy of 50 to 65 mN / m is a coating having a component ratio of (A) copolyester, (B) polyvinyl alcohol, (C) fine particles and (D) compound within the range of the present invention. For example, it can be obtained by laminating with a thickness of 0.02 to 1 μm.

In the present invention, in addition to the above components, other resins such as oxazoline resin, epoxy resin, and melamine resin, antistatic agent, colorant,
Surfactants, ultraviolet absorbers and the like can be used.

[Lamination of Coating Film] In the present invention, a coating film composed of the above components is laminated on at least one surface of the polyester film. For example, an aqueous liquid containing a component for forming a coating film is applied to a stretchable polyester film. After that, drying, stretching and, if necessary, heat treatment can be performed to laminate. The solid concentration of this aqueous liquid is usually 30
% By weight or less, more preferably 10% by weight or less.

The stretchable polyester film is an unstretched polyester film, a uniaxially stretched polyester film or a biaxially stretchable polyester film that can be further stretched. Among them, a vertically stretched polyester film uniaxially stretched in a film extrusion direction (longitudinal direction) is particularly preferable.

When the aqueous liquid is applied to the polyester film, if it is carried out in a normal application step, that is, in a step separated from the production step of the film in the biaxially stretched and heat-set polyester film, trash, dust and the like are easily entrained. Not preferred. From such a viewpoint, application in a clean atmosphere, that is, application in a film manufacturing process is preferable. According to this coating, the adhesion of the coating film to the polyester film is further improved.

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

The stretchable polyester film coated with the aqueous liquid is guided to a drying and stretching process, which can be performed under conventionally known conditions. Among these, particularly preferable conditions are, for example, drying conditions at a temperature of 90 to 130 ° C. for 2 to 10 seconds, a stretching temperature of 90 to 130 ° C., a stretching ratio of 3 to 5 times in a longitudinal direction, and 3 to 5 times in a transverse direction. If necessary, the length in the vertical direction is 1 to 3 times, and in the case of heat fixing, the temperature is 180 to 240 ° C. for 2 to 20 seconds.

The thickness of the polyester film after such treatment is preferably 50 to 150 μm, and the thickness of the coating film is preferably 0.02 to 1 μm.

[0029]

The present invention will be further described with reference to the following examples.
In addition, each characteristic value was measured by the following method.

1. Adhesiveness before printing 70% by weight of spherical silica (average particle diameter 18μ, average pore diameter 200 angstrom, average pore volume 1.5cc / g) 70% by weight, polyvinyl alcohol (Kuraray PVA117) 30% by weight on the coating surface of the polyester film Is applied in a dry thickness of 20 μm, and a width 1
A 2.7 mm, 150 mm long scotch tape (No. 600, manufactured by 3M Co.) was adhered so as to prevent air bubbles from entering, and the top of the scotch tape was adhered by a manual load roll described in JIS C2701 (1975). Later, cut out to tape width. When the scotch tape was peeled from the sample thus prepared, the state of peeling of the ink image receiving layer from the polyester film was observed, and the adhesion was evaluated as follows. A: No peeling was observed at all and good adhesion B: Slight peeling was observed at the foreign matter portion C: Peeling was noticeably observed

2. Adhesion after printing 70% by weight of spherical silica (average particle diameter 18μ, average pore diameter 200 angstrom, average pore volume 1.5cc / g) 70% by weight, polyvinyl alcohol (Kuraray PVA117) 30% by weight on the coating surface of the polyester film Is applied in a dry thickness of 20 μm, and an ink jet printer (PM-750 manufactured by EPSON) is applied thereon.
The image taken by a digital camera or the like in step C) is taken into a personal computer and printed, and the printed image is 12.7 mm wide and 15 cm long.
0mm scotch tape (No. 60 manufactured by 3M)
0) is adhered so that air bubbles do not enter.
2701 (1975), after being leveled and adhered by a manual load roll, cut out to a tape width. When peeling scotch tape from the sample created in this way,
The peeling state of the ink image receiving layer from the polyester film was observed, and the adhesion was evaluated as follows. A: No peeling was observed at all and good adhesion B: Slight peeling was observed at the foreign matter portion C: Peeling was noticeably observed

3. Water-Resistant Adhesion The grease was impregnated with water from above the ink image-receiving layer, rubbed, and the number of rubbings before the ink-image-receiving layer was dropped was evaluated as described below. A: 50 times or more: extremely good water-resistant adhesiveness B: 30 to 50 times: good water-resistant adhesiveness C: less than 30 times: poor water-resistant adhesiveness

4. Folding adhesiveness For the adhesiveness evaluation, first, the ink receiving layer was bent at 180 ° C., then the other side was bent at 180 ° C., and a scotch tape was stuck on the ink receiving layer at the folded back portion and peeled off. The detachment of the ink receiving layer was evaluated as follows. A: The ink receiving layer falls off only at the bent portion (peeling width 1)
B: Bending width + 30% width, ink receiving layer falls off (peel width 1 mm or more and less than 1.3 mm) C: Bending width + 50% width, ink receiving layer falls off (peeling width 1.5 mm or more) )

5. Coefficient of friction According to ASTM D 1894-63, a static friction coefficient was measured by applying a load of 1 kg with the front and back surfaces of the film together using a slipper measuring device manufactured by Toyo Tester Co., Ltd. If the coefficient of friction exceeds 0.6, film transportability will be impaired.

6. Blocking property Two sheets of film cut to a width of 50 mm are stacked and 4.9MP.
After processing at 40 ° C. × 50% RH × 17 hours under the load of a,
Peel strength (g / 5) at the point where a load was applied by a tensile tester
0 mm). Evaluation was made as follows by the value of the peel strength. Peel strength ≦ 10 g / 50 mm: good blocking property 10 g / 50 mm <peel strength ≦ 30 g / 50 mm—somewhat good blocking property 30 g / 50 mm <peel strength: poor blocking property

7. Surface energy WAZisman: “Contact Augle, Wettability and Adhesi
on ", Am. Chem. Soc., (1964), the measured critical surface tension γc was used as the surface energy.

8. Secondary transition point Using a DuPont Thermal Analyst 2000 differential calorimeter,
The measurement was performed at a heating rate of 20 ° C./min.

9. Intrinsic viscosity The viscosity of the solution with orthochlorophenol solvent is 35 ℃
Was measured and determined.

10. Moisture resistance In the evaluation of the blocking property, the treatment condition was 60 ° C.
Peeling strength (g / 50 mm) was measured in the same manner except that x70% RH x 17 hours. Evaluation was made as follows from the measurement results. Peel strength ≦ 10 g / 50 mm… good moisture resistance 10 g / 50 mm <peel strength ≦ 30 g / 50 mm… Slightly good moisture resistance 30 g / 50 mm <peel strength… poor moisture resistance

11. Water dispersibility The coating agent was diluted with water to form a 0.2% by weight aqueous dispersion, and the light transmittance was measured using a quartz cell with a double beam spectrophotometer (type 228A) manufactured by Hitachi, Ltd. . Evaluation was made as follows from the measurement results.

12. Gloss Gs (60 °) Gloss 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 is the value of the gloss Gs (60 °).

13. Light transmittance The light transmittance was measured using a HR-100 haze meter manufactured by Murakami Color Research Laboratory in accordance with ASTM D1003.

14. Heat Shrinkage The shrinkage after heat treatment of the polyester film at 150 ° C. for 30 minutes was measured at a distance between the gauge points of 30 cm.

15. Center line average roughness (Ra) According to JIS B0601, using a high-precision surface roughness meter SE-3FAT manufactured by Kosaka Laboratory Co., Ltd.
μm, load 30 mg, magnification 50,000 times, cutoff 0.
Under the condition of 08 mm, a chart was drawn and a portion of the measured length L was extracted from the surface roughness curve in the direction of its center line, the center line of the extracted portion was taken as the X axis, and the direction of the vertical magnification was taken as the Y axis. When the roughness curve was represented by Y = f (x), the value given by the following equation was represented in nm.

[0045]

(Equation 1)

In this measurement, the reference length is 1.25 mm, and
Four samples were measured and represented by an average value.

16. Sharpness The polyester film coated with the ink image-receiving layer was printed on an inkjet printer (PM-
The image photographed by a digital camera or the like at 750C) was taken into a personal computer, printed, and the sharpness of the printed matter was visually observed and evaluated as follows. A: Printing is very clear and good ..... Very good clarity. B: Printing is very good and clarity ..... Clarity is very good. C: Printing is unclear and clarity is poor.・ Poor image quality

Example 1 A polyester (intrinsic viscosity: 0.62) comprising a terephthalic acid component and an ethylene glycol component was melt-extruded onto a rotating cooling drum maintained at 20 ° C. to form an unstretched film. After the stretched film is stretched 3.6 times in the machine axis direction, a copolyester (acid component is terephthalic acid [69]) is used as an aqueous binder.
Mol%], isophthalic acid [21 mol%] and 5-Na
Copolymerized polyester consisting of sulfoisophthalic acid [10 mol%] and a glycol component of diethylene glycol [60 mol%] and neopentyl glycol [40 mol%] (Tg = 30 ° C .; hereinafter, may be simply abbreviated as “E”. )) 51% by weight, 20% by weight of polyvinyl alcohol having a saponification degree of 86 to 89% by mole, 10% by weight of crosslinked acrylic resin particles having an average particle size of 40 nm, a compound represented by the following formula (II) (hereinafter simply referred to as "O") (May be abbreviated as 10)
An aqueous liquid having a solid content concentration of 4% by weight and having a composition of 9% by weight of polyoxyethylene lauryl ether and 9% by weight of polyoxyethylene lauryl ether was applied by a roll coater. Next, the longitudinally stretched film coated with the aqueous liquid was stretched 4 times in the transverse direction while drying, and further heat-set at 230 ° C. to obtain a biaxially stretched film having a thickness of 100 μm.

The film thickness of this film is 0.03 μm
m, the center line average surface roughness was 14 nm, the surface energy was 59 mN / m, and the heat shrinkage was 0.9% in the vertical direction and 0.2% in the horizontal direction. Table 1 shows the characteristics of this film.

[0050]

Embedded image

Comparative Example 1 Except that the aqueous liquid was not applied,
Table 1 shows the properties of the biaxially stretched polyester film obtained in the same manner as in Example 1.

Examples 2 to 7 Biaxially stretched polyester films were obtained in the same manner as in Example 1 except that the types and ratios of the coating agents were changed as shown in Table 1. Table 1 shows the characteristics of this film.

[0053]

[Table 1]

As is evident from the results shown in Table 1, the polyester film having good adhesion to the ink image-receiving layer of the present invention is excellent in adhesiveness.

In Table 1, (A) Copolyester types E and F (Note 1) indicate the following compounds. E: Terephthalic acid [69 mol%] / isophthalic acid [21
Mol%] · 5-Na sulfoisophthalic acid [10 mol%]
/ Copolymer of diethylene glycol [60 mol%] / neopentyl glycol [40 mol%] (Tg = 30 ° C.) F: terephthalic acid [60 mol%] • isophthalic acid [30
Mol%] · 5-K sulfoterephthalic acid [10 mol%] /
Ethylene glycol [20 mol%], 1,4-butanediol [60 mol%], neopentyl glycol [20
Mol%] copolymer (Tg = 25 ° C.)

Further, in Table 1, the types P, Q and R (Note 2) of (B) polyvinyl alcohol indicate that they are the following compounds. P: polyvinyl alcohol having a saponification degree of 86 to 89 mol% Q: polyvinyl alcohol having a saponification degree of 74 to 78 mol% R: polyvinyl alcohol having a saponification degree of 92 to 95 mol%

In Table 1, (C) Fine particle types M and N (Note 3) indicate the following compounds. M: Crosslinked acrylic particles having an average particle size of 40 nm N: Colloidal silica particles having an average particle size of 80 nm In Table 1, the types O and S of the compound (D) in Table 1 (Note 4)
Indicates that O is a compound represented by the following formula (II) and S is a compound represented by the following formula (III).

[0058]

Embedded image

[0059]

Embedded image

Examples 8 and 9 and Comparative Examples 2 to 4 (A) The same procedures as in Example 1 were carried out except that the types of copolyester were changed as shown in Tables 2 and 3 and copolyesters having different Tg were used. Similarly, a biaxially stretched polyester film was obtained. Table 2 shows the properties of the obtained film.

[0061]

[Table 2]

[0062]

[Table 3]

As is evident from the results shown in Table 2, the ink-receiving layer easily adhesive polyester film of the present invention has excellent blocking resistance and adhesiveness.

Examples 10 to 13 and Comparative Example 5 (A) The procedure of Example 1 was repeated except that the proportion of the dicarboxylic acid component containing the sulfonic acid salt group of the copolyester was changed as shown in Table 4. An axially stretched polyester film was obtained. Table 4 shows the properties of the obtained film.

[0065]

[Table 4]

As is evident from the results shown in Table 4, the polyester film having good adhesion to the ink image-receiving layer of the present invention is excellent in moisture resistance and adhesiveness.

Examples 14 to 18 and Comparative Examples 6 to 13 (A) copolyester, (B) polyvinyl alcohol,
A biaxially stretched polyester film was obtained in the same manner as in Example 1, except that the types and ratios of the (C) fine particles and the (D) compound were changed as shown in Table 5. Table 5 shows the properties of the obtained film. In addition, each symbol of the kind of the composition for coating in Table 5 shows that it is the said compound.

[0068]

[Table 5]

As is evident from the results shown in Table 5, the polyester film having good adhesion to the ink receiving layer of the present invention is excellent in adhesiveness and transportability.

[Examples 19 and 20 and Comparative Examples 14 and 1
5] (C) A biaxially stretched polyester film was obtained in the same manner as in Example 1, except that the particle size of the fine particles was changed as shown in Table 6. Table 6 shows the properties of the obtained film.

[0071]

[Table 6]

As is clear from the results shown in Table 6, the polyester film having good adhesion to the ink image-receiving layer of the present invention has excellent blocking resistance.

[Examples 21 and 22 and Comparative Examples 16 and 1
7] (A) copolyester, (B) polyvinyl alcohol,
A biaxially stretched polyester film was obtained in the same manner as in Example 1, except that the ratio of the fine particles (C) and the compound (D) was changed as shown in Table 7. Table 7 shows the properties of the obtained film.
Shown in

[0074]

[Table 7]

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

Example 23 A composition comprising 90% by weight of a polyester (intrinsic viscosity: 0.62) comprising a terephthalic acid component and an ethylene glycol component and 10% by weight of titanium oxide was placed on a rotary cooling drum maintained at 20 ° C. After being melt-extruded into an unstretched film, and then stretched 3.6 times in the machine axis direction, the unstretched film is used as an aqueous binder to obtain a copolymerized polyester (acid component containing terephthalic acid [69]).
Mol%], isophthalic acid [21 mol%] and 5-Na
51% by weight of a copolymerized polyester comprising sulfoisophthalic acid [10% by mole] and a glycol component composed of diethylene glycol [60% by mole] and neopentyl glycol [40% by mole]: Tg = 30 ° C), saponification degree 86 to 89% by mole 20% by weight of polyvinyl alcohol, average particle size 40
10% by weight of crosslinked acrylic resin particles of the formula (II)
An aqueous liquid having a solid content of 4% by weight and having a composition of 10% by weight of the compound (O) represented by the formula (1) and 9% by weight of polyoxyethylene lauryl ether was applied by a roll coater. Next, the longitudinally stretched film coated with the aqueous liquid was stretched 4 times in the transverse direction while drying, and further heat-set at 230 ° C. to obtain a biaxially stretched film having a thickness of 100 μm. The film thickness of this film is 0.03 μm, the gloss is 60, the light transmittance is 3%, the heat shrinkage is 0.9% in the vertical direction and 0. 0 in the horizontal direction.
2%, clearness and adhesion were good.

[0077]

The polyester film having good adhesion to the ink image-receiving layer of the present invention has excellent concealing properties and excellent adhesion to the aqueous ink-image-receiving layer of an ink jet printer or the like, and is useful for an image receiving paper.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) C08J 7/04 CFD C08K 3/00 4J029 C08K 3/00 C08L 29/04 D 4J036 C08L 29/04 63/00 A 63/00 67/02 67/02 B41J 3/04 101Y (72) Inventor Shinji Yano 3-37-19 Koyama, Sagamihara-shi, Kanagawa Prefecture F-term in the Sagamihara Research Center, Teijin Limited 2C056 EA13 FB01 FC06 2H086 BA12 BA15 BA19 BA31 BA33 BA41 BA45 4F006 AA35 AB35 BA01 CA01 DA04 4F100 AK21 AK25 AK41A AK41B CC00B DE01 EJ05 EJ38 GB90 JL11 4J002 BC03Z BE02X BG00Z CC16Z CC18Z CD13Y CF14W DJ030 DE086 DJ030 DE0386 BA03 BA05 BA10 BD07A BF09 BF26 CA02 CA06 CB05A CB06A CB10A CC06A CD05 CH02 DB02 FC03 FC05 JE182 KB02 4J036 AH05 DB02 FB01 FB11 JA01

Claims (5)

[Claims] 1. A film in which a coating film is laminated on at least one surface of a polyester film, wherein the coating film has a proportion of (A) a dicarboxylic acid component having a sulfonate group to all dicarboxylic acid components of 6 to 15 mol%. And
Copolyester 3 having a secondary transition point of 20 to 40 ° C
0 to 80% by weight, (B) 15 to 45% by weight of polyvinyl alcohol having a saponification degree of 70 to 90 mol%, (C) 3 to 25% by weight of fine particles having an average particle diameter of 20 to 80 nm, and
(D) a composition comprising 5 to 20% by weight of a compound represented by the following formula (I) as a main component, and having a surface energy of 5%;
An ink-receiving layer easily-adhesive polyester film having a thickness of 0 to 65 mN / m. Embedded image 2. The polyester film according to claim 1, wherein the polyester film is a white film having a gloss of 50 or more and a light transmittance of 20% or less. 3. A polyester film having a thickness of 30 ° C. at 150 ° C.
2. The polyester film according to claim 1, which is a biaxially stretched film having a heat shrinkage of 1% or less when held for 1 minute. 4. A polyester film having a light transmittance of 20
% Or less of a white film, wherein the water-based ink image-receiving layer is further provided on the coating film for use. 5. The polyester film according to claim 4, which is used for an image receiving paper for an ink jet printer.