JP2000203155A - Accepting film for ink jet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesion durability between an ink accepting layer and a base material polyester film by a method wherein a layer made of a polyester resin melt with hot water is laminated onto at least one side of a polyester film so as to provide an ink accepting film through the above layer. SOLUTION: In this accepting film for an ink jet as the polyester film used for a base material film, a polyester, the major constitutional component of which is ethylene terephthalate, is preferably used from the synthetic judgement on quality, economical efficiency or the like. Further, when heat acts on a base material, a polyethylene-2,6-naphthalate excellent in heat resistance and rigidity is preferable. Onto at least one side of the above base material polyester film, a layer made of a polyester resin meltable with hot water is laminated. Onto the above layer, an ink accepting layer including a water-soluble resin such as a polyvinyl alcohol or a water-dispersible resin is laminated so as to improve the adhesion durability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving film for ink jet, and more particularly to a receiving film for ink jet which can satisfy the adhesion durability between an ink receiving layer and a base polyester film.

[0002]

2. Description of the Related Art As a method of performing recording using a recording liquid, an ink jet recording system has recently emerged.
Ink-jet recording is a method in which small droplets of recording liquid are generated by various operating principles, and the droplets fly to adhere to a recording material such as paper for recording. , Which is attracting attention as a recording method capable of multicolor printing. As the recording liquid for ink jet recording, an aqueous liquid is mainly used from the viewpoint of safety and printability.

As a recording material used in the ink jet recording method, ordinary paper has conventionally been generally used. However, with the improvement of the performance of the ink jet recording machine, such as high-speed recording or multi-color recording, recording materials for ink jet recording are required to have more advanced characteristics. That is, in order to obtain high-resolution and high-quality recording image quality, an ink-jet recording material having high ink absorbency and excellent coloration properties has been proposed. For example, an ink-jet recording material having an ink-receiving layer using various water-absorbing organic materials or inorganic materials containing pseudo-boehmite as a main component (Japanese Patent Application Laid-Open No. Hei 3-215082).

On the other hand, biaxially oriented polyester films are:
Because of its excellent properties such as dimensional stability, mechanical properties, heat resistance, transparency, and electrical properties, it can be used in many applications such as magnetic recording materials, packaging materials, electrical insulating materials, various photographic materials, and graphic arts materials. Widely used as a base film.

In general, biaxially oriented polyester films have a highly crystalline orientation on the surface, so that various types of paints and resins,
It has the disadvantage of poor adhesion to ink. For this reason, conventionally, studies have been made to impart adhesiveness to the polyester film surface by various methods.

As a method for imparting adhesiveness, for example, a surface activation method of subjecting a surface of a base polyester film to a corona discharge treatment, an ultraviolet irradiation treatment, a plasma treatment, or the like, a surface etching method using a chemical such as an acid, alkali, or amine aqueous solution. , Acrylic resin, polyester resin on the film surface,
A method of providing various resins such as urethane resin and polyolefin resin as a primer layer is known (JP-A-58-29626, JP-A-60-149442).
JP-A-62-152850, JP-A-6-152850
No. 108037). Among them, in particular, as a method of providing the above-mentioned primer layer by application and imparting adhesiveness, a coating liquid containing the above-mentioned resin component is applied to a polyester film before completion of crystal orientation, dried, and then subjected to stretching and heat treatment. A method of completing crystal orientation by in-line coating (in-line coating method) is considered to be promising in terms of process simplification and manufacturing cost, and is performed in the art.

[0007]

However, the above-mentioned polyester film has a problem that the adhesion durability to the ink receiving layer for ink jet cannot be obtained. SUMMARY OF THE INVENTION An object of the present invention is to improve the disadvantages of the prior art and to provide an ink jet receiving film capable of satisfying the adhesion durability between the ink receiving layer and the base polyester film.

[0008]

In order to achieve the above object, the ink-jet receiving film of the present invention comprises a polyester film, on at least one side of which a layer made of a polyester resin soluble in hot water is laminated. An ink-jet receiving film comprising a receiving layer.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the ink-jet receiving film of the present invention, the polyester of the polyester film as the base film is a generic term for polymers having an ester bond as a main bonding chain of a main chain, and is preferably a polyester. As ethylene terephthalate, ethylene-
2,6-naphthalate, butylene terephthalate, ethylene-α, β-bis (2-chlorophenoxy) ethane-
Those having at least one component selected from 4,4'-dicarboxylate and the like as a main component can be used. One of these components may be used alone, or two or more of them may be used in combination. Among them, it is particularly preferable to use a polyester containing ethylene terephthalate as a main component when comprehensively judging quality, economy and the like. When heat acts on the substrate, polyethylene-2,6-naphthalate, which is excellent in heat resistance and rigidity, is more preferable.

[0010] These polyesters may further contain some other dicarboxylic acid component or diol component, preferably 2 or more.
0 mol% or less may be copolymerized.

The polyester further contains various additives such as antioxidants, heat stabilizers, weather stabilizers, ultraviolet absorbers, organic lubricants, pigments, dyes, organic or inorganic fine particles, fillers, Antistatic agents, nucleating agents and the like may be added to such an extent that their properties are not deteriorated.

The intrinsic viscosity of the above-mentioned polyester (25 ° C.
Measured in o-chlorophenol) is 0.4-1.2.
dl / g is preferable, and more preferably 0.5 to 0.8 d
Those in the range of 1 / g are suitable for practicing the present invention.

The polyester film using the above polyester is preferably biaxially oriented when the resin layer and the ink receiving layer are provided. With a biaxially oriented polyester film, generally, a polyester sheet or film in an unstretched state is stretched about 2.5 to 5 times in each of the longitudinal direction and the width direction, and then subjected to a heat treatment to complete the crystal orientation. And wide-angle X
It refers to one that shows a biaxially oriented pattern in line diffraction.

The thickness of the polyester film is not particularly limited and may be appropriately selected, but it is usually 1 to 500 μm, preferably 5 to 300 μm from the viewpoint of mechanical strength, handleability and the like. Further, the obtained films can be used by being bonded by various methods.

[0015] In addition to a transparent polyester film, a white polyester film is preferably used as the base film. This white polyester film is not particularly limited as long as it is a polyester film colored white, and preferably has a whiteness of 85 to 85.
150%, more preferably 90 to 130%, and the optical density is preferably 0.5 to 5, more preferably 1.2 to
This is the case of 3. For example, when a base film having a small whiteness is used, the pattern and coloring on the opposite surface are transmitted, and the appearance of the printed layer on the surface is easily impaired.On the other hand, when the optical density is small, sufficient light reflection is not obtained. However, when viewed with the naked eye, whiteness is reduced and the opposite surface is affected, which is not preferable.

The method for obtaining such optical density and whiteness is not particularly limited, but it can be usually obtained by adding a resin incompatible with inorganic particles or polyester. The amount to be added is not particularly limited, but is preferably 5 to 35% by weight, more preferably 8 to 2% in the case of inorganic particles.
5% by weight. On the other hand, when an incompatible resin is added, it is preferably 5 to 35% by volume, more preferably 8 to 2% by volume.
5% by volume.

The inorganic particles are not particularly limited, but preferably have an average particle size of 0.1 to 4 μm, more preferably 0.3 to 4 μm.
1.5 μm inorganic particles and the like can be used as typical examples. Specifically, barium sulfate, calcium carbonate, calcium sulfate, titanium oxide, silica, alumina, talc, clay and the like or a mixture thereof can be used. These inorganic particles can be used as other inorganic compounds such as calcium phosphate, titanium oxide, mica. , Zirconia, tungsten oxide, lithium fluoride, calcium fluoride and the like. Further, among the above-mentioned inorganic particles, those having a Mohs hardness of 5 or less, preferably 4 or less are more preferable because the whiteness is further increased.

The resin incompatible with the above-mentioned polyester is not particularly limited. For example, in the case of mixing with polyethylene terephthalate or polyethylene-2,6-naphthalate, acrylic resin, polyethylene,
Polypropylene, a modified olefin resin, a polybutylene terephthalate resin, a phenoxy resin, polyphenylene oxide, or the like can be used, and may be used in combination with the above-described inorganic particles. For example, in particular, a white polyester film having a specific gravity of 0.5 to 1.3, which is obtained by mixing a resin incompatible with inorganic particles or polyester and biaxially stretching and having a cavity inside, is preferable because the printing characteristics are improved. .

The polyester resin laminated on at least one side of the base polyester film according to the present invention is soluble in hot water. In the present invention, hot water is 5
It is water at 0 to 100 ° C, and a preferable temperature range is 60 to 80 ° C. In the present invention, "dissolved in hot water" means, when evaluated by the method described in the column of "method for measuring properties and evaluation method for effects" described later in this specification, those which show the properties of "O". Say. If the temperature is too low, sufficient adhesion durability cannot be obtained.

Such a polyester resin has an ester bond in a main chain or a side chain, and can be obtained by polycondensation from an acid component and a glycol component. Further, the polyester resin contains 2 to 15 mol%, preferably 3 to 13 mol% of a monomer having a sulfonic acid group and its base.
It is not particularly limited as long as it is copolymerized by mol%, more preferably 5 to 10 mol%. If the amount of the monomer is too small, sufficient adhesion durability may not be obtained. The monomer in the present invention refers to an acid component or a glycol component that forms a polyester resin.

Examples of the acid component which does not contain a sulfonic acid group and its base constituting the polyester resin include terephthalic acid, isophthalic acid, phthalic acid, 2,5-dimethylterephthalic acid, 1,4-naphthalenedicarboxylic acid, biphenyldicarboxylic acid , 2,6-naphthalenedicarboxylic acid, 1,
2-bisphenoxyethane-p, p'-dicarboxylic acid,
Phenylindanedicarboxylic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, dodecandionic acid, dimer acid, 1,3-cyclopentanedicarboxylic acid, 1,
2-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and the like, and their ester-forming derivatives can be used.

Examples of the compound containing a sulfonic acid group and a base thereof include sulfoterephthalic acid, 5-sulfoisophthalic acid, 4-sulfoisophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, and sulfo-p-xylyl. Len glycol, 2-sulfo-1,4-bis (hydroxyethoxy) benzene, and the like, and ester-forming derivatives thereof, and alkali metal salts, alkaline earth metal salts, ammonium salts, and the like thereof can be used. it can.

In order to improve the adhesion of the polyester resin to the substrate film, it is possible to copolymerize a compound containing a carboxylate group.

Examples of the compound containing a carboxylate group include trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic anhydride, 4-methylcyclohexene-1,2,3-tricarboxylic acid, trimesic acid, ,
2,3,4-butanetetracarboxylic acid, 1,2,3,4
-Pentanetetracarboxylic acid, 3,3 ′, 4,4′-benzophenonetetracarboxylic acid, 5- (2,5-dioxotetrahydrofurfuryl) -3-methyl-3-cyclohexene-1,2-dicarboxylic acid, 5- (2,5-dioxotetrahydrofurfuryl) -3-cyclohexene-
1,2-dicarboxylic acid, cyclopentanetetracarboxylic acid, 2,3,6,7-naphthalenetetracarboxylic acid,
1,2,5,6-naphthalenetetracarboxylic acid, ethylene glycol bistrimellitate, 2,2 ', 3,3'
-Diphenyltetracarboxylic acid, thiophene-2,3
Alkali metal salts such as 4,5-tetracarboxylic acid and ethylenetetracarboxylic acid, alkaline earth metal salts, and ammonium salts can be used, but are not limited thereto.

As the glycol component constituting the polyester resin, ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol,
Polypropylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octane Diol, 1,9-nonanediol, 1,10-decanediol, 2,4-dimethyl-2-ethylhexane-1,
3-diol, neopentyl glycol, 2-ethyl-
2-butyl-1,3-propanediol, 2-ethyl-
2-isobutyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2,4-trimethyl-1,6-hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexane Dimethanol, 1,4-cyclohexanedimethanol, 2,2
4,4-tetramethyl-1,3-cyclobutanediol, 4,4′-thiodiphenol, bisphenol A,
4,4'-methylenediphenol, 4,4 '-(2-norbornylidene) diphenol, o-, m-, and p
-Dihydroxybenzene, p, p'-isopropylidenediphenol, cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-
1,4-diol and the like can be used.

As the polyester resin, a modified polyester copolymer, for example, a block copolymer or a graft copolymer modified with acryl, urethane, epoxy or the like can be used.

In the resin layer according to the present invention, other resins such as a polyester resin other than the above-mentioned polyester resin, an acrylic resin, a urethane resin, an epoxy resin, or the like, as long as the effects of the present invention are not impaired. Polycarbonate resin, silicone resin, alkyd resin, urea resin, phenol resin and the like may be blended.

Further, in the resin layer according to the present invention, various additives such as an antioxidant, a heat-resistant stabilizer, a weather-resistant stabilizer, an ultraviolet absorber, an easy-to-use additive as long as the effects of the present invention are not impaired. Lubricants, pigments, dyes, organic or inorganic fine particles, fillers, antistatic agents, nucleating agents, and the like may be added.

It is optional to add particles to the resin layer according to the present invention. However, the addition of these particles improves the slipperiness, anti-blocking property, and adhesion durability with the ink receiving layer. is there.

The particles arbitrarily added to the resin layer according to the present invention are not particularly limited, but silica, colloidal silica, alumina, alumina sol, kaolin, talc, mica, calcium carbonate and the like can be used. The average particle size is not particularly limited, but 0.01 to
5 μm is preferable, and more preferably 0.05 to 3 μm,
Most preferably, it is 0.08 to 2 μm. The mixing ratio with respect to the total resin in the resin layer is not particularly limited, but is preferably 0.05 to 8 parts by weight, more preferably 0.1 to 3 parts by weight in terms of solids weight ratio.

The method for forming the above resin layer is not particularly limited, but usually, a coating method, a co-extrusion method and the like are used. The method of coating on the substrate film is various coating methods, for example, a reverse coating method, a gravure coating method,
Rod coating, bar coating, die coating, spray coating and the like can be used. Preferably, a method of applying a resin dissolved and dispersed in an organic solvent or water is used in the production process of the polyester film.

The thickness of the resin layer according to the present invention is not particularly limited, but is preferably 0.02 to 5 μm, more preferably 0.03 to 2 μm, and most preferably 0.05 to 0.05 μm.
０．５0.5 μm. If the thickness of the layer is too small, the durability of adhesion to the ink receiving layer may be poor.

The ink-receiving layer according to the present invention contains a water-soluble resin or a water-dispersible resin, and may be any one that absorbs an ink-jet ink, preferably one that absorbs an aqueous ink-jet ink. It is not limited. Examples of the water-soluble resin or the water-dispersible resin include, for example, methyl cellulose, hydroxyethyl cellulose, carboxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylethyl cellulose, cellulose sulfate, potato starch,
Potato starch, oxidized starch, phosphate starch, carboxylated starch, hydroxyethylated starch, cyanoethylated starch, acrylic acid grafted starch,
Dextrin, cornstarch, konjac, seaweed,
Agar, sodium alginate, trollooi, tragacanth gum, gum arabic, locust bean gum, guar gum, pectin, carrageenan, glue, gelatin, casein, soy protein, albumin, fully or partially saponified polyvinyl alcohol and its anions, cationically modified products,
Polyvinyl alcohol, polyacrylamide and its copolymer, polyvinylpyrrolidone and its copolymer, polyethylene oxide, ethylene oxide-propylene oxide copolymer, polybutylene oxide, carboxylated polyethylene having an acetalization degree or a butyralization degree of 30% or less Oxide, polyacrylic acid and its sodium salt, styrene-maleic anhydride copolymer,
Examples include an ethylene-maleic anhydride copolymer.
Among them, polyvinyl alcohol is particularly useful from the viewpoints of film formability, ink absorbency, and transparency. These water-soluble resins or water-dispersible resins may be used alone or in combination of two or more.

It is optional to add particles or a cross-linking agent to the ink-receiving layer according to the present invention. However, the addition of these particles improves ink absorbency, adsorbability, water resistance and color development, and is therefore preferable. is there.

The particles arbitrarily added to the ink receiving layer according to the present invention are not particularly limited, but include silica, colloidal silica, alumina, alumina sol, zeolite, titanium oxide, kaolin, kaolinite, talc, mica, and calcium carbonate. Etc. can be used.

The crosslinking agent arbitrarily added to the ink receiving layer according to the present invention is not particularly limited, but may be a methylolated or alkylolated urea-based or melamine-based crosslinking agent.
Acrylamide-based, polyamide-based resins, epoxy compounds, isocyanate compounds, oxazoline-based compounds, aziridine compounds, various silane coupling agents, various titanate-based coupling agents, and the like can be used.

The thickness of the ink receiving layer according to the present invention is not particularly limited, but is 5 to 100 μm, preferably 10 to 50 μm. If the layer is too thin, ink absorption and image resolution may be poor. On the other hand, if the layer is too thick, the drying rate may be low and the production efficiency may be poor.

The above-mentioned ink receiving layer is formed by a method in which a coating liquid for forming an ink receiving layer is applied to a substrate using a coating apparatus and dried. Examples of the coating method include a blade coat method, an air knife method, a roll coat method, a brush coat method, a gravure coat method, a kiss coat method, an extrusion method, a slide hopper (slide beat) method, a curtain coat method, and a spray method. Can be used.

Next, the method for producing the ink-jet receiving film of the present invention will be described with reference to an example in which polyethylene terephthalate (hereinafter abbreviated as “PET”) is used as a base film, but the present invention is not limited to this. Absent.

For example, the intrinsic viscosity is 0.5 to 0.8 dl / g
After vacuum drying the PET pellets, it is supplied to an extruder, melted at 260 to 300 ° C., extruded from a T-shaped die into a sheet, and subjected to a surface temperature of 1 using an electrostatic application casting method.
It was wound around a mirror casting drum at 0 to 60 ° C. and cooled and solidified to prepare an unstretched PET film. This unstretched film is stretched 2.5 to 5 times in the longitudinal direction (the direction of film movement) between rolls heated to 70 to 120 ° C. At least one surface of this film was subjected to a corona discharge treatment, and the treated surface was coated with a resin layer forming coating solution of the present invention, which is made of a polyester resin which is water-soluble at 60 to 80 ° C. The coated film is gripped with a clip, guided to a hot air zone heated to 70 to 150 ° C., dried, stretched 2.5 to 5 times in the width direction, and subsequently stretched to 160 to 150 ° C.
It was led to a heat treatment zone of 250 ° C. and heat treated for 1 to 30 seconds to complete the crystal orientation. During this heat treatment step, a 3 to 12% relaxation treatment may be performed in the width direction or the longitudinal direction as necessary. The biaxial stretching may be any of longitudinal and transverse sequential stretching or simultaneous biaxial stretching, and may be re-stretched in any of the longitudinal and transverse directions after the longitudinal and transverse stretching. Also,
The coating liquid used in this case is preferably water-based in view of environmental pollution and explosion-proof properties.

The inkjet receiving film of the present invention can be obtained by providing an ink receiving layer on the resin layer of the polyester film provided with the above resin layer. The ink receiving layer can be obtained by applying the ink receiving layer forming coating solution and then drying. Before applying the coating liquid, a corona discharge treatment or the like may be applied as necessary to improve the coatability and further improve the adhesion between the resin layer and the ink receiving layer. Further, in order to prevent curling, a curling preventing layer such as a resin layer or a pigment layer may be provided on the back surface of the substrate or at a predetermined position.

[0042]

[Method for measuring characteristics and method for evaluating effects] The method for measuring characteristics and the method for evaluating effects in the present invention are as follows.

(1) Solubility The polyester resin was weighed to a solid content of 5% by weight, stirred with hot water for 2 hours, cooled to room temperature, and then dissolved in an aqueous solution to a solid content of 5% by weight. Was re-prepared and filtered through a 2 μm filter. At this time, 50 ~
The degree of water solubility was evaluated in three stages based on the dissolved state and the amount of the residue after the above-mentioned treatment under any temperature condition within the range of 100 ° C., and “O” was regarded as good solubility.

：: The aqueous solution was transparent or slightly cloudy, but the amount of the product filtered was 5% of the measured amount of the polyester resin.
% By weight.

Δ: The aqueous solution was strongly cloudy, and the amount by filtration was 5 to 10% by weight of the measured amount of the polyester resin.

X: Hard to dissolve or the aqueous solution was strongly cloudy, and the amount by filtration was 10% by weight or more of the measured amount of the polyester resin.

(2) Adhesive Durability-1 100 crosscuts of 1 mm ² were put on the resin layer of a film in which a resin layer was formed on a polyester film, and a cellophane tape was stuck thereon and pressed with a rubber roller (load). (3 reciprocations at 19.6 N), and then peeled in the 90 ° direction. Adhesion durability is determined by the number of remaining resin layers.
Grade evaluation (◎: 100, ○: 80 to 99, Δ: 50 to 7)
9, x: 0 to 49).

(3) Adhesion Durability-2 100 crosscuts of 1 mm ² were put on the ink receiving layer of the film, a cellophane tape was stuck thereon, and pressed with a rubber roller (3 at a load of 19.6 N). After reciprocation), the film was peeled in the 90 ° direction. The adhesion durability was evaluated in four steps based on the number of remaining ink receiving layers (（: 10
0, ○: 80 to 99, Δ: 50 to 79, ×: 0 to 49)
And

[0049]

Next, embodiments of the present invention will be described with reference to examples, but the present invention is not necessarily limited thereto.

Example 1 PET containing 0.015% by weight of colloidal silica having an average particle diameter of 0.4 μm and 0.005% by weight of colloidal silica having an average particle diameter of 1.5 μm was dried under reduced pressure at 180 ° C. for 5 hours ( (3 Torr), and then supply it to the extruder at 280 ° C.
, And after high-precision filtration of these polymers, they were extruded from a T-shaped die into a sheet.

This was wound around a casting drum having a surface temperature of 20 ° C. using an electrostatic application casting method and cooled and solidified to form an unstretched film. This unstretched film was stretched 3.3 times in the longitudinal direction at 95 ° C.

The film was subjected to a corona discharge treatment in the air, and a coating liquid a for forming a resin layer kept at 25 ° C. was applied to the treated surface. The coated uniaxially stretched film is heated to 100 ° C. while being gripped by clips, stretched 3.3 times in the width direction in a state where the water content in the coating liquid on the film is 50% by weight or less, and then at 225 ° C. for 15 seconds. The thickness of the base PET film is 100 μm and the thickness of the resin layer is 0.15 μ
m PET film was obtained.

Resin layer forming coating liquid a: An aqueous coating liquid composed of a polyester resin comprising the following acid component and glycol component.

Polyester resin-Acid component 85% by mole of terephthalic acid 15% by mole of 5-sodium sulfonyl isophthalic acid-Glycol component 100% by weight of ethylene glycol Further, on the above-mentioned PET film on which a resin layer is formed, Gohsenol GH-23 (Nippon Gohsei Chemical) Industrial Co., Ltd.) 10
A gravure solution was prepared by coating an ink receiving layer-forming coating solution in which a weight% aqueous solution and Cataroid AS-3 (manufactured by Catalyst Chemical Industry Co., Ltd.) were adjusted to a weight ratio of 1/10 so that the coating thickness after drying was 20 μm. The composition was applied with a coater and dried at 150 ° C. to provide an ink receiving layer on the resin layer to obtain an ink jet receiving film.

As shown in Table 1, the results showed that the adhesion durability was good.

Example 2 An ink-receiving film was prepared in the same manner as in Example 1 except that the composition of the coating liquid for forming a resin layer in Example 1 was changed to the following coating liquid b for forming a resin layer. This film had good adhesion durability.

Resin layer forming coating liquid b: An aqueous coating liquid composed of a polyester resin comprising the following acid component and glycol component.

Polyester resin ・ Acid component 70% by mole of terephthalic acid 30% by mole of 5-sodium sulfonylisophthalic acid ・ Glycol component 100% by mole of ethylene glycol Example 3 The composition of the resin layer forming coating solution of Example 1 is as follows. An ink jet receiving film was prepared in the same manner as in Example 1 except that the coating liquid c was used. This film had good adhesion durability.

Coating liquid c for forming a laminated film: An aqueous coating liquid composed of a polyester resin comprising the following acid component and glycol component.

Polyester resin ・ Acid component 92 mol% terephthalic acid 8 mol% 5-sodium sulfonyl isophthalic acid 8 mol% ・ Glycol component ethylene glycol 100 mol% Comparative Example 1 The composition of the resin layer forming coating liquid of Example 1 is as follows. A film was prepared in the same manner as in Example 1 except that the coating liquid was changed to d. This film was applied as a water dispersion because of poor water solubility of the resin for forming the resin layer, but the adhesion durability was poor.

Resin layer forming coating liquid d: An aqueous coating liquid composed of a polyester resin comprising the following acid component and glycol component.

Polyester resin ・ Acid component 2,6-naphthalenedicarboxylic acid 80 mol% 5-sodium sulfonyl isophthalic acid 20 mol% ・ Glycol component ethylene glycol 100 mol% Comparative Example 2 The composition of the resin layer forming coating liquid of Example 1 was A film was prepared in the same manner as in Example 1, except that the following resin layer forming coating liquid e was used. This film was applied as a water dispersion because of poor water solubility of the resin for forming the resin layer, but the adhesion durability was poor.

Resin layer forming coating liquid e: An aqueous coating liquid composed of a polyester resin comprising the following acid component and glycol component.

Polyester resin ・ Acid component Terephthalic acid 50 mol% Isophthalic acid 32 mol% Sebacic acid 15 mol% 5-sodium sulfonyl isophthalic acid 3 mol% ・ Glycol component Ethylene glycol 55 mol% Neopentyl glycol 45 mol% Comparative Example 3 A film was formed in the same manner as in Example 1 except that the resin layer of Example 1 was not formed. As shown in Table 1, no resin layer was provided, so that the adhesion durability was poor.

[0065]

[Table 1]

[0066]

As described above, the ink-jet receiving film produced by the present invention has a structure in which a layer made of a polyester resin soluble in hot water is laminated on at least one surface of the polyester film, and an ink receiving layer is provided via the layer. Thus, it is possible to provide an inkjet receiving film capable of satisfying the adhesion durability between the ink receiving layer and the base polyester film.

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2C056 EA21 FB02 2H086 BA15 BA19 BA35 4F100 AA20 AK01C AK21C AK41A AK41B AK42A AK42B AL01B BA03 BA10A BA10C BA13 EH17 EH46 EJ37 GB90 JB05J JC09B00 JB09JB00

Claims (5)

[Claims] 1. An ink jet receiving film comprising a polyester film, a layer made of a polyester resin soluble in hot water, laminated on at least one side of the polyester film, and an ink receiving layer provided on the layer. 2. The polyester resin soluble in hot water contains 2 to 15 mol% of a monomer having a sulfonic acid group and its base.
The receiving film for an ink jet according to claim 1, wherein the receiving film is a copolymerized polyester copolymer. 3. The ink-jet receiving film according to claim 1, wherein the ink-receiving layer contains a water-soluble resin or a water-dispersible resin. 4. The water-soluble resin contained in the ink receiving layer,
4. A polyvinyl alcohol according to claim 3,
The receiving film for inkjet according to item 1. 5. The method according to claim 1, wherein the polyester film is a polyethylene terephthalate film or a polyethylene-2,6-naphthalate film.
5. The receiving film for inkjet according to 2, 3, or 4.