JPH10309780A - Recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent ink absorptivity, water resistance, blocking resistance and image clarity in good balance by forming a receptive layer of a recording sheet out of a specific polymer as main ingredient. SOLUTION: The recording sheet is formed with a receptive layer for ink on at least one surface of a light transmittance base material. The layer is formed of copolymer having 1 to 30 mol.% of structural unit represented by a formula I and 99 to 70 mol.% represented by a formula II as a main ingredient. Here, in the formula I, R1 indicates hydrogen or methyl group, R2 , R3 each indicates hydrogen or alkyl group, and (n) indicates integer of 1 to 100. In the formula II, R indicates hydrogen or acetyl group. Such a recording sheet has excellent ink absorptivity, water resistance, image resolution, blocking resistance in good balance and can be applied for various printing. Particularly, application to printing with aqueous ink is excellent, and the sheet is adapted to OHP recording sheet or film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording sheet, and more particularly to a recording sheet applied to various printings such as ink jet printing, offset printing, flexographic printing, etc. The present invention relates to an ink-absorbing type OHP film and a recording sheet for a pen plotter.

[0002]

2. Description of the Related Art Conventionally, as a sheet applied to printing with an aqueous ink, for example, JP-A-59-174381 and JP-A-60-224578 have been proposed in order to impart ink absorbency to the surface of a support. For example, it has been proposed to provide an ink-receiving layer layer mainly composed of a water-absorbing polymer such as starch, a water-soluble cellulose derivative, polyvinyl alcohol, and polyvinylpyrrolidone on a support. However, the characteristics required especially for coating agents such as ink absorbing type OHP films or sheets are that the ink absorbing speed is fast, the coating strength is large even in the swelling state with water, and it is not broken by ordinary friction, and furthermore, the blocking property is high. There is no gender and good slip. Until now, satisfactory ink receiving layer materials having a good balance of various properties have not been obtained.

[0003]

Various studies have been made to improve the balance between ink absorption, water resistance, and image clarity. For example, when polyvinyl alcohol is used, the image clarity is improved. Is good, the ink absorption, water resistance, poor blocking properties, and when using a PEO-based resin, the ink absorption is good, there is some water resistance, but the image clarity, poor blocking resistance, Further, even if inorganic or organic fine particles are added to them, only the blocking resistance is eliminated. In addition, it was found that when both were laminated or mixed in various configurations, the disadvantages of both were not eliminated. Therefore, the present inventors,
As a result of deep research, the ink receiving layer mainly composed of a specific copolymer has better ink absorption, water resistance,
It has been found that the anti-blocking properties, image clarity and the like exhibit a remarkably excellent balance, and the present invention has been completed.

[0004]

The present invention has the following configuration. (1) In a recording sheet having a receiving layer for ink on at least one surface of a light-transmitting base material, the receiving layer is represented by the formula (1a) (Wherein R ₁ is hydrogen or a methyl group, R ₂ and R ₃ are hydrogen or an alkyl group, n is an integer from 1 to 100), and 1 to 30 mol% of a structural unit represented by the formula:
(1b) (Wherein R ₄ is hydrogen or an acetyl group.) A recording sheet comprising a copolymer comprising 99 to 70 mol% of a structural unit represented by the following formula: (2) In a recording sheet having a receptor layer for ink on at least one surface of a light-transmitting substrate, the receptor layer may have the formula (2a) (Wherein R ₅ is hydrogen or a methyl group, R ₆ is an alkyl group or an ammonium alkyl group) and a structural unit represented by the formula (2b) (Wherein R ₇ is hydrogen or an acetyl group). A recording sheet comprising a copolymer containing a cation component as a main component. (3) In a recording sheet having a receiving layer for ink on at least one surface of a light-transmitting base material, the receiving layer is represented by the formula (3a) And a structural unit represented by the formula (3b) And a structural unit represented by the formula (3c) (Wherein, R ₈ is an alkyl group or a carboxyphenyl group). A recording sheet comprising a copolymer containing an anionic component as a main component. (4) A recording sheet having one or more ink receiving layers on at least one surface of a light-transmitting base material and having a multilayer structure including the light-transmitting base material and the receiving layer; A recording sheet comprising a bead-like matting agent having a particle size of 10 to 30 µm. (5) A recording sheet having one or more ink receiving layers on at least one surface of a light-transmitting substrate and having a multilayer structure including the light-transmitting substrate and the receiving layer, wherein the receiving layer is Equation (1a) (Wherein R ₁ is hydrogen or a methyl group, R ₂ and R ₃ are hydrogen or an alkyl group, n is an integer from 1 to 100), and 1 to 30 mol% of a structural unit represented by the formula:
(1b) (Wherein, R ₄ is hydrogen or an acetyl group.) A copolymer comprising 99 to 70 mol% of structural units represented by the following formula:
A recording sheet comprising a bead-like matting agent having a size of from 30 μm to 30 μm. (6) A recording sheet having one or more ink receiving layers on at least one surface of a light-transmitting base material and having a multilayer structure including the light-transmitting base material and the receiving layer, wherein the receiving layer is: Equation (2a) (Wherein R ₅ is hydrogen or a methyl group, R ₆ is an alkyl group or an ammonium alkyl group) and a structural unit represented by the formula (2b) (Wherein, R ₇ is hydrogen or an acetyl group), and is formed mainly of a copolymer containing a cation component, and has at least an uppermost layer having a particle size of 10 to 30 μm. A recording sheet comprising a matting agent. (7) A recording sheet having one or more ink receiving layers on at least one surface of a light-transmitting base material and having a multilayer structure including the light-transmitting base material and the receiving layer, wherein the receiving layer comprises: Equation (3a) And a structural unit represented by the formula (3b) And a structural unit represented by the formula (3c) (Wherein, R ₈ is an alkyl group or a carboxyphenyl group), and is formed mainly of a copolymer containing an anionic component. At least the top layer has a bead shape having a particle size of 10 to 30 μm. A recording sheet comprising a matting agent. (8) A recording sheet having one or more ink receiving layers on at least one surface of a light-transmitting base material and having a multilayer structure including the light-transmitting base material and the receiving layer, wherein the uppermost layer is (4) to being the uppermost layer of the receiving layer
The recording sheet according to any one of (7). (9) The mixing ratio of the bead-like matting agent is 0.01 to 30.
The recording sheet according to any one of (4) to (8), wherein the recording sheet is a weight%. (10) The recording sheet according to any one of (1) to (9), which is used for printing with an aqueous ink.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a copolymer comprising the structural units represented by the above formulas (1a) and (1b) on at least one surface of a light-transmissive substrate, represented by formulas (2a) and (2b) A copolymer comprising the structural unit represented by formula (3)
a) A receiving layer (hereinafter, referred to as an ink receiving layer) for an ink containing a copolymer composed of the structural units represented by (3b) and (3c) as a main component is provided. The above copolymer,
The ink receiving layer may be used alone, or two or more kinds may be used in combination.

Preferred examples and descriptions of the various definitions included within the scope of the present invention of the copolymer used in the present invention are described in detail below. Suitable alkyl groups include, for example, methyl, ethyl ,
n-propyl, isopropyl, butyl, isobutyl, t
A straight-chain or branched-chain alkyl group such as tert-butyl and the like can be mentioned.

The method for producing the copolymer used in the present invention may be a conventional method, which is generally commercially available.

[0008] The translucent substrate used in the present invention includes:
There is no particular limitation, and examples thereof include paper, coated paper, nonwoven fabric, glass, plastic film or sheet, and a plastic film is preferable from the viewpoint of light transmission, strength, and practicality. Examples of the plastic film include polyester, polystyrene, polyvinyl chloride, poly (meth) acrylate, cellulose derivatives such as cellulose acetate, polyolefins such as polyethylene and polypropylene, polycarbonate, polyamide, polyesteramide, polyether, polyimide, polyamideimide. , Polyetherester, triacetate and the like,
Furthermore, if there is no problem in light transmission, these copolymers,
Blends and crosslinked products can also be used. Of these, polyester is preferred from the viewpoint of mechanical strength, workability, and the like, and polyethylene terephthalate is particularly preferred.

[0009] If necessary, the plastic film
Antioxidants, heat stabilizers, lubricants, pigments, ultraviolet absorbers and the like may be added. Further, for the purpose of improving the adhesiveness with the ink receiving layer, a corona discharge treatment, an undercoat treatment, or the like can be performed.

[0010] The recording sheet of the present invention may have an ink-permeable protective layer as a protective layer on the ink receiving layer. The component and thickness of the protective layer are not particularly limited as long as the protective layer has an ink permeability due to a porous structure or the like, and particularly has an ink permeability to an aqueous ink and has a light transmitting property. Not done.

In the recording sheet of the present invention, the ink receiving layer may have one
And a multilayer structure including a light-transmissive substrate and the ink receiving layer, and at least an uppermost layer such as an ink receiving layer and / or a protective layer has an inorganic particle diameter of 10 to 30 μm, or An organic bead-like matting agent may be contained for the purpose of improving blocking resistance and water resistance. The main component constituting the ink receiving layer is not particularly limited as long as it has an ink absorbing property at the time of forming the ink receiving layer,
A copolymer composed of the structural units represented by the formulas (1a) and (1b), a copolymer composed of the structural units represented by the formulas (2a) and (2b), or the copolymers represented by the formulas (3a), (3b),
A copolymer comprising the structural unit represented by (3c) is preferred. The multilayer structure has a structure in which one or more ink receiving layers are provided on a light-transmitting substrate, and the uppermost layer of the ink receiving layer is the uppermost layer of the multilayer structure. It is preferable to mix an inorganic or organic bead-like matting agent with the above. When the ink receiving layer has two or more layers, the main components constituting each layer may be the same or different for each layer.

The mixing ratio of the above-mentioned bead-like matting agent is preferably in the range of 0.01 to 30% by weight, particularly preferably 10 to 30% by weight, based on the components constituting the layer in which the bead-like matting agent is to be added. It is good to add in the range of -30% by weight. If the compounding ratio is more than 30% by weight, the sharpness of the image will be impaired, and if no inorganic or organic bead-like matting agent is used, the blocking resistance will decrease.

As the inorganic or organic bead-like matting agent, silica, clay, talc, calcium carbonate, aluminum silicate, synthetic zeolite, alumina, zinc oxide and the like can be used. The particle size of the bead-like matting agent is 10
-30 μm is desirable. When the particle size is less than 10 μm,
The blocking resistance is impaired, and if it is larger than 30 μm, the sharpness of the image is impaired.

In the recording sheet of the present invention, by adopting such a constitution, an upper layer having excellent blocking resistance and water resistance is formed on a lower layer having good ink absorption, and ink absorption, water resistance and water resistance are improved. The balance of blocking properties, image clarity, and the like becomes better.

In order to improve the water resistance of the ink receiving layer, various crosslinking agents may be incorporated in the ink receiving layer. The mixing ratio of the crosslinking agent is preferably 0.01 to 10% by weight based on the components constituting the ink receiving layer.
If the compounding ratio is more than 10% by weight, the remaining crosslinking agent exhibits a plasticizer effect, and the receiving layer becomes sticky, which is not practical. Examples of the crosslinking agent include a melamine compound, an epoxy compound, a boric acid compound, a zirconium compound,
Titanium compounds, phosphorus compounds, silane coupling agents, and the like can be used.

In the ink receiving layer according to the present invention, other water-soluble polymers or water-dispersible polymers can be added as long as the effects of the present invention are not impaired. Examples of such a water-soluble polymer include polyvinyl pyrrolidone, a water-soluble cellulose derivative, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyethylene oxide, polyvinyl methyl ether, starch, casein,
And cationic polymers. Examples of the water-dispersible polymer include an acrylic emulsion, a polyester emulsion, a vinyl acetate emulsion, and a styrene-butadiene latex.

Further, in the present invention, the ink-receiving layer contains an antifoaming agent, a coating improver, a thickener, an antioxidant, a heat stabilizer, a lubricant, a pigment, as long as the effects of the present invention are not impaired. Additives such as an ultraviolet absorber and an antistatic agent may be added.

The respective layers constituting the recording sheet of the present invention, such as the ink receiving layer, excluding the light-transmitting substrate, are formed by a conventional method.
In the case of an ink receiving layer, a copolymer comprising the structural units represented by the above formulas (1a) and (1b);
A resin material as a main component such as a copolymer composed of structural units represented by b) or a copolymer composed of structural units represented by formulas (3a), (3b) and (3c) is dissolved in a solvent. After dispersing and applying this on a translucent substrate,
A method such as drying the solvent may be mentioned, and each layer may be sequentially laminated. When a bead-like matting agent is compounded, it may be mixed with the above-mentioned solvent simultaneously or sequentially with the resin material and mixed with stirring.

The solvent is not particularly limited, and may be appropriately selected according to the resin material to be used, the type of bead-like matting agent to be mixed, and the like.

The method of applying each layer is not particularly limited, and roll coating, air knife coating, blade coating, rod coating, bar coating,
A known method such as a comma coating method can be applied.

The thickness of the ink receiving layer is appropriately selected depending on the application.

Test Examples Hereinafter, the effects of the present invention will be described in more detail by test examples. Test Example 1 Evaluation of ink absorptivity The recording sheets of Examples 1 to 8, Comparative Examples 1 to 4, and Reference Example 1 were tested for cyan, yellow, magenta, and black using a Hewlett-Packard inkjet plotter (DesignJet 250C). Each color is printed solid to form a recorded image, and immediately after printing, PP
After placing the C copy paper thereon and applying a load of 40 g / cm ² thereon, the PPC copy paper was turned over, and the degree of transfer of the ink was visually determined according to the following evaluation criteria. ◎: No migration Means excellent ink absorption. …: Migration within 30% means good ink absorption. Δ: migration 40 to 90% means ink absorbability. X: migration 100% means ink absorption is not possible.

Test Example 2 Evaluation of Water Resistance The ink-jet plotter (D) manufactured by Hewlett-Packard was applied to the recording sheets of Examples 1 to 9 and Comparative Examples 1 to 4.
four colors (cyan, yellow, magenta, and black) are printed solidly to form a recorded image, and after printing, the printed portion is wiped three times with a cotton swab moistened with water to remove ink. It was visually determined according to the following evaluation criteria. ◎… No change Means excellent water resistance. …: A small amount of ink is removed, and the printed area becomes thinner. ×: Means that the receiving layer at the wiped portion can be completely removed.

Test Example 3 Evaluation of Image Resolution The yellow-based magenta line (width) was applied to the recording sheets of Examples 1 to 8, Comparative Examples 1 to 4, and Reference Example 1 by an ink-jet plotter (DesignJet 250C) manufactured by Hewlett-Packard. After printing 100 μm), the dots were observed at a magnification of 50 times with a microscope and dots were observed. . …: The dots hardly bleed ○: The dots slightly bleed, the measured value was larger than 120 μm ×: The dots bleed, and the boundary between adjacent yellow and magenta dots was not recognized

Test Example 4 Evaluation of Blocking Resistance Two or more recording sheets were superimposed on the recording sheets of Examples 1 to 8, Comparative Examples 1 to 4 and Reference Example 1 to obtain 40 g / cm ^2.
And stored for 1 day at 40 ° C. and 90% RH humidity, and judged according to the following evaluation criteria. ◎: Neither matting nor blocking ○: Matting, but no blocking ×: Blocking

Table 1 shows the results of Test Examples 1 to 4.

[Table 1] As is evident from the results in Table 1, the recording sheets of Examples 1 to 8 have ink absorbency, water resistance,
The properties of image resolution and blocking resistance are excellent in a well-balanced manner.

[0027]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples. Example 1 A copolymer resin comprising structural units represented by the formulas (1a) and (1b), a bead-like matting agent, a melamine crosslinking agent, and an acid catalyst were blended in the following weight ratio, and the thickness was 100 μm.
m of polyethylene terephthalate film (Melinex 705, manufactured by ICI Japan Co., Ltd.) which had been subjected to an easy adhesion treatment and dried to form an ink receiving layer having a thickness of 15 μm. After the formation of the receiving layer, a heat treatment of 100 ° C. or more × 3 minutes or more was performed. Resin (manufactured by Nippon Synthetic Chemical Co., Ltd .; OKS-7158G) 85.5% by weight Bead-like matting agent (methyl methacrylate, particle size 20 μm) (manufactured by Sekisui Plastics Co., Ltd .; Techpolymer MBX-20) 10.0 wt. % Melamine crosslinking agent (Mitsui Cytec Co., Ltd .; Cymel 303) 4.4% by weight Acid catalyst (Mitsui Cytec Co., Ltd .; Catalyst 600) 0.1% by weight

[Example 2] A copolymer resin comprising structural units represented by the formulas (1a) and (1b), a bead-like matting agent, a melamine crosslinking agent, and an acid catalyst were blended in the following weight ratio.
It was applied on a 100 μm-thick polyethylene terephthalate film (Melinex 705, manufactured by ICI Japan Co., Ltd.) which had been subjected to an easy adhesion treatment, and dried to form an ink receiving layer having a thickness of 15 μm. After the formation of the receiving layer, 100 ° C. or more
Heat treatment was performed for 3 minutes or more. Resin (manufactured by Nippon Synthetic Chemical Co., Ltd .; OKS-7158G) 85.5% by weight Bead-shaped matting agent (silica, particle size: 12 μm) (Fuji Silysia K.K .; Cycilia 470) 10.0% by weight Melamine crosslinking agent ( Mitsui Cytec Co., Ltd .; Cymel 303) 4.4% by weight Acid catalyst (Mitsui Cytec Co., Ltd .; Catalyst 600) 0.1% by weight

Example 3 A 100 μm thick polyethylene terephthalate film was prepared by blending a copolymer resin composed of structural units represented by the formulas (2a) and (2b) and a bead-like matting agent in the following weight ratio. It was coated on a diamond foil Hoechst; T600) and dried to form a 15 μm thick ink receiving layer. Resin (manufactured by Takamatsu Yushi Co., Ltd .; NS-63-130) 80.0% by weight Bead-like matting agent (methyl methacrylate, particle size 20 μm) (manufactured by Sekisui Plastics Co., Ltd .; Techpolymer MBX-20) 20.0 weight%

Embodiment 4 Equations (3a), (3b) and (3
A copolymer resin comprising the structural unit represented by c) and a bead-like matting agent are blended in the following weight ratio, and the thickness is 100 μm.
m on a polyethylene terephthalate film (manufactured by Diafoil Hoechst; T600), and dried to a thickness of 1
A 5 μm ink receiving layer was provided. Resin (manufactured by Takamatsu Yushi Co., Ltd .; IN-177P) 80.0% by weight Bead-like matting agent (methyl methacrylate, particle size 20 μm) (manufactured by Sekisui Plastics Co., Ltd .; Techpolymer MBX-20) 20.0% by weight

Example 5 A copolymer resin comprising the structural units represented by the formulas (2a) and (2b) was coated with a resin having a thickness of 100 μm.
m of polyethylene terephthalate film (T600, manufactured by Diafoil Hoechst Co., Ltd.) and dried to form an ink receiving layer 1 having a thickness of 5 μm. Furthermore, equation (3)
a) A copolymer resin composed of the structural units represented by (3b) and (3c) and a bead-shaped matting agent are blended in the following weight ratio, coated on the ink receiving layer 1 and dried. An ink receiving layer 2 having a thickness of 5 μm was provided. Ink receiving layer 1 compound Resin: Copolymer resin comprising structural units represented by formulas (2a) and (2b) (manufactured by Takamatsu Yushi Co., Ltd .; NS-63-130) Ink receiving layer 2 compound Resin: Formula (3a) ), (3b), copolymer resin consisting of structural units represented by (3c) (manufactured by Takamatsu Yushi Co., Ltd .; IN-177P) 80.0% by weight Bead-like matting agent (methyl methacrylate, particle size 20 μm) ( Sekisui Plastics Co., Ltd .; Techpolymer MBX-20) 20.0% by weight

[Embodiment 6] Equations (3a), (3b) and (3
A copolymer resin comprising the structural unit represented by c) was applied on a 100 μm-thick polyethylene terephthalate film (manufactured by Diafoil Hoechst; T600) and dried to form an ink receiving layer 1 having a thickness of 5 μm. Further, a copolymer resin composed of the structural units represented by the formulas (2a) and (2b) and a bead-like matting agent are blended in the following weight ratio, coated on the ink receiving layer 1, and dried. 5μ thickness
m of the ink receiving layer 2 was provided. Ink receiving layer 1 compound Resin: Copolymer resin comprising structural units represented by formulas (3a), (3b), and (3c) (manufactured by Takamatsu Yushi Co., Ltd .; IN-177P) Ink receiving layer 2 compound Resin: Formula Copolymer resin comprising structural units represented by (2a) and (2b) (manufactured by Takamatsu Yushi Co., Ltd .; NS-63-130) 80.0% by weight Bead-like matting agent (methyl methacrylate, particle size 20 μm) Sekisui Plastics Co., Ltd .; Techpolymer MBX-20) 20.0% by weight

Example 7 A copolymer resin comprising the structural units represented by the formulas (2a) and (2b) was coated with a resin having a thickness of 100 μm.
m on a polyethylene terephthalate film (manufactured by Diafoil Hoechst; T600), and dried to a thickness of 7
A μm ink receiving layer 1 was provided. Further, equation (3a),
A copolymer resin composed of the structural units represented by (3b) and (3c) and a bead-like matting agent are blended in the following weight ratio, coated on the ink receiving layer 1, dried, and dried to a thickness of 3 μm.
m of the ink receiving layer 2 was provided. Ink receiving layer 1 compound Resin: Copolymer resin comprising structural units represented by formulas (2a) and (2b) (manufactured by Takamatsu Yushi Co., Ltd .; NS-63-130) Ink receiving layer 2 compound Resin: Formula (3a) ), (3b), copolymer resin consisting of structural units represented by (3c) (manufactured by Takamatsu Oil & Fat Co., Ltd .; IN-177P) 90.0% by weight Bead-like matting agent (silica, particle size 12 μm) (Fuji Silicia K.K .; Cycilia 470) 10.0% by weight

Embodiment 8 Equations (3a), (3b) and (3
A copolymer resin comprising the structural unit represented by c) was applied on a 100 μm-thick polyethylene terephthalate film (manufactured by Diafoil Hoechst; T600) and dried to provide an ink-receiving layer 1 having a thickness of 7 μm. further,
A copolymer resin composed of the structural units represented by the formulas (2a) and (2b) and a bead-like matting agent are blended in the following weight ratio, coated on the ink receiving layer 1, dried, and dried. 3μ
m of the ink receiving layer 2 was provided. Ink receiving layer 1 compound Resin consisting of structural units represented by resin formulas (3a), (3b) and (3c) (manufactured by Takamatsu Yushi Co., Ltd .; IN-177P) Ink receiving layer 2 compound Resin: Formula ( Copolymer resin consisting of structural units represented by 2a) and (2b) (manufactured by Takamatsu Yushi Co., Ltd .; NS-63-130) 90.0% by weight Bead-like matting agent (silica, particle size 12 μm) (Fuji Silysia) (Sycilia 470, manufactured by Corporation) 10.0% by weight

[Comparative Example 1] Polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Co., Ltd .; NH-26) was applied onto a 100 μm-thick polyethylene terephthalate film (Menex 705, manufactured by ICI Japan) which had been subjected to an easy adhesion treatment and dried. Thus, an ink receiving layer having a thickness of 15 μm was provided.

[Comparative Example 2] Polyvinylpyrrolidone (PVP K-30, provided by Gokyo Sangyo Co., Ltd.) was applied to a thickness of 100 μm.
m of polyethylene terephthalate film (Melinex 705, manufactured by ICI Japan) which had been subjected to an easy adhesion treatment and dried to form an ink receiving layer having a thickness of 15 μm.

Comparative Example 3 A partially crosslinked polyethylene oxide (Aqua Coke, manufactured by Sumitomo Seika Co., Ltd.)
It was applied on a polyethylene terephthalate film (Meinex 705, manufactured by ICI Japan) with an easy adhesion treatment of 00 μm and dried to form an ink receiving layer having a thickness of 15 μm.

Comparative Example 4 Vinyl acetate (manufactured by Daicel Chemical Industries, Ltd .; Sebian A-117) was applied to a thickness of 100 μm.
Was coated on a polyethylene terephthalate film (Melinex 705, manufactured by ICI Japan) which had been subjected to an easy adhesion treatment, and dried to form an ink receiving layer having a thickness of 15 μm.

[Reference Example 1] A copolymer resin composed of structural units represented by the formulas (1a) and (1b) and a bead-like matting agent were blended in the following weight ratio, and a 100 μm-thick easily-adhesive treatment was performed. Polyethylene terephthalate film (ICI
Japan Co., Ltd., Melinex 705)
After drying, an ink receiving layer having a thickness of 10 μm was provided. Resin (manufactured by Nippon Gohsei; OKS-7158G) 70.0% by weight Bead-like matting agent (methyl methacrylate, particle size 20 μm) (manufactured by Sekisui Plastics; Techpolymer MBX-20) 30.0% by weight

[0040]

The recording sheet of the present invention has a good balance of the properties of ink absorption, water resistance, image resolution and blocking resistance, and can be applied to various printings. In particular, it is excellent in application to printing with water-based ink, and is extremely suitable as an OHP recording sheet or film for ink jet printing or pen plotter.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C09D 133/08 C09D 133/08 139/06 139/06 G03B 21/132 G03B 21/132 G03F 7/00 G03F 7/00 // C09D 11/02 C09D 11/02

Claims (10)

[Claims] 1. A recording sheet having a receiving layer for ink on at least one side of a light-transmitting substrate, wherein the receiving layer is represented by the formula (1a) (Wherein R ₁ is hydrogen or a methyl group, R ₂ and R ₃ are hydrogen or an alkyl group, n is an integer from 1 to 100), and 1 to 30 mol% of a structural unit represented by the formula:
(1b) (Wherein R ₄ is hydrogen or an acetyl group.) A recording sheet comprising a copolymer comprising 99 to 70 mol% of a structural unit represented by the following formula: 2. A recording sheet having a receptor layer for ink on at least one side of a light-transmitting substrate, wherein the receptor layer has the formula (2a) (Wherein R ₅ is hydrogen or a methyl group, R ₆ is an alkyl group or an ammonium alkyl group) and a structural unit represented by the formula (2b) (Wherein R ₇ is hydrogen or an acetyl group). A recording sheet comprising a copolymer containing a cation component as a main component. 3. A recording sheet having a receiving layer for ink on at least one surface of a light-transmitting substrate, wherein the receiving layer is represented by the formula (3a): And a structural unit represented by the formula (3b) And a structural unit represented by the formula (3c) (Wherein, R ₈ is an alkyl group or a carboxyphenyl group). A recording sheet comprising a copolymer containing an anionic component as a main component. 4. A recording sheet having one or more ink receiving layers on at least one surface of a light-transmitting substrate and having a multilayer structure including the light-transmitting substrate and the receiving layer, wherein at least the uppermost layer And a bead-like matting agent having a particle size of 10 to 30 μm. 5. A recording sheet having one or more ink receiving layers on at least one surface of a light-transmitting substrate and having a multilayer structure including the light-transmitting substrate and the receiving layer. Is the formula (1a) (Wherein R ₁ is hydrogen or a methyl group, R ₂ and R ₃ are hydrogen or an alkyl group, n is an integer from 1 to 100), and 1 to 30 mol% of a structural unit represented by the formula:
(1b) (Wherein, R ₄ is hydrogen or an acetyl group.) A copolymer comprising 99 to 70 mol% of structural units represented by the following formula:
A recording sheet comprising a bead-like matting agent having a size of from 30 μm to 30 μm. 6. A recording sheet having one or more ink receiving layers on at least one side of a light-transmitting base material and having a multilayer structure including the light-transmitting base material and the receiving layer. Is the formula (2a) (Wherein R ₅ is hydrogen or a methyl group, R ₆ is an alkyl group or an ammonium alkyl group) and a structural unit represented by the formula (2b) (Wherein, R ₇ is hydrogen or an acetyl group), and is formed mainly of a copolymer containing a cation component, and has at least an uppermost layer having a particle size of 10 to 30 μm. A recording sheet comprising a matting agent. 7. A recording sheet having at least one receiving layer for ink on at least one surface of a light-transmitting base material and having a multilayer structure including the light-transmitting base material and the receiving layer. Is the formula (3a) And a structural unit represented by the formula (3b) And a structural unit represented by the formula (3c) (Wherein, R ₈ is an alkyl group or a carboxyphenyl group), and is formed mainly of a copolymer containing an anionic component. At least the uppermost layer has a bead shape having a particle size of 10 to 30 μm. A recording sheet comprising a matting agent. 8. A recording sheet having one or more ink receiving layers on at least one side of a light-transmitting substrate, and having a multilayer structure including the light-transmitting substrate and the receiving layer. The recording sheet according to any one of claims 4 to 7, wherein the upper layer is the uppermost layer of the receiving layer. 9. The compounding ratio of the bead-like matting agent is 0.0
9. The composition according to claim 4, wherein the content is 1 to 30% by weight.
The recording sheet according to any one of the above. 10. The recording sheet according to claim 1, wherein the recording sheet is used for printing with an aqueous ink.