JP2001287443A - Chemical agent composition for ink jet recording paper and ink jet recording paper using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chemical agent composition for ink jet recording paper excellent in compatibility and permeability with respect to aqueous ink for an ink jet printer. SOLUTION: The chemical agent composition for the ink jet recording paper contains a copolymer (D), which contains at least a copolymerizable monomer (A) represented by formula 1 (wherein, R1 is a hydrogen atom or a methyl group; and R2 is a hydrogen atom or a lower alkyl group), a copolymerizable monomer (B) having a cation modifiable group and, if necessary, a copolymerizable monomer (C) having at least two oxyalkylene groups in its molecule as monomer components, as a constituent. Further, a binder component containing a hydrophilic resin is further added to the chemical agent composition as a constituent and the hydrophilic resin is polyvinyl alcohol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a chemical composition for ink jet recording paper, and more particularly, to a chemical composition for ink jet recording paper which can be suitably used for an ink receiving layer of the ink jet recording paper.

[0002]

2. Description of the Related Art In recent years, computers have become widespread, and ink jet printers have been widely used as printers for printing. In such an ink jet printer, a water-based ink is preferably used. Even if an attempt is made to print on a plastic film such as polyester using such an aqueous ink jet printer, it is difficult to print at a high resolution because the aqueous ink is difficult to fix on the film surface. For this reason, conventionally, a dispersion of fine particles such as colloidal silica in a hydrophilic binder (such as polyvinyl alcohol) is applied to the surface of a hydrophobic substrate such as a plastic film, or the like. Improves the affinity of the substrate surface. However, these methods do not always have sufficient improvement effects.

Therefore, Japanese Patent Application Laid-Open No. 8-283653 discloses a copolymer comprising a specific monomer such as a hydroxyethyl (meth) acrylic monomer and a radically polymerizable monomer having at least two oxyalkylene groups in the molecule. Surface treatment agents containing coalescence have been proposed.

[0004]

However, in recent years, the printing speed has been increased, and even if an ink receiving layer on an ink jet recording paper is formed using a surface treating agent described in JP-A-8-283653, At the time of high-speed printing, the resolution is not sufficiently high. Therefore, it cannot be said that the affinity and the permeability for these aqueous inks are sufficiently high.

Accordingly, an object of the present invention is to provide a chemical composition for ink jet recording paper which has excellent affinity and permeability for aqueous inks for ink jet printers.

Another object of the present invention is to provide a chemical composition for ink-jet recording paper which can form an ink-receiving layer of ink-jet recording paper having excellent resolution and water-based ink drying properties even during high-speed printing. It is in.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a copolymer containing at least a plurality of specific monomer components is used as a component of a drug composition for ink jet recording paper. The present inventors have found that the ink receiving layer of the ink jet recording paper made of the chemical composition has excellent printing resolution and water-based ink drying properties, and can be suitably used even in high-speed printing, thereby completing the present invention.

That is, as a monomer component, the following formula (1)

Embedded image (Wherein, R ¹ represents a hydrogen atom or a methyl group, R ² represents a hydrogen atom or a lower alkyl group) and a copolymerizable monomer having a cation-modifiable group. It is a chemical composition for ink jet recording paper comprising a copolymer (D) containing at least a reactive monomer (B) as a component.

The chemical composition for ink-jet recording paper of the present invention contains a copolymer of the above-mentioned monomer (A) and monomer (B) as a constituent component, so that it has an affinity for and penetration into aqueous ink for an ink-jet printer. Excellent in nature. Therefore, when the ink receiving layer of the ink jet recording paper is formed with the chemical composition, printing can be performed with high resolution, and the water-based ink has excellent drying properties. Therefore, it can be suitably used even in high-speed printing.

Particularly, in the present invention, a copolymerizable monomer (A) represented by the above formula (1) and a copolymerizable monomer (B) having a cation-modifiable group are used as monomer components.
A chemical composition for ink jet recording paper comprising a copolymer (D) containing at least a copolymerizable monomer (C) having at least two oxyalkylene groups in the molecule as a component is preferable.

When the copolymer (D) composed of the monomer (A), the monomer (B) and the monomer (C) is used as a component, the affinity and the permeability to the aqueous ink for an ink jet printer can be further enhanced. Therefore, when the ink receiving layer of the ink jet recording paper is formed with the chemical composition, printing can be performed at a higher resolution, and the water-based ink has more excellent drying properties. Therefore, it can be suitably used even in high-speed printing.

In a preferred embodiment of the present invention, the copolymerizable monomer (A) represented by the formula (1) is hydroxyethyl (meth) acrylate.

In the present invention, the copolymerizable monomer (B) having a cation-modifiable group is represented by the following formula (2):

Embedded image (Wherein, R ³ and R ⁴ are the same or different and are each a hydrogen atom,
Shows a hydrocarbon group. ) Is preferably a (meth) acrylic monomer having a nitrogen atom-containing group.

In the present invention, the copolymerizable monomer (C) having at least two oxyalkylene groups in the molecule is
Preferably, it is an alkoxy polyethylene glycol (meth) acrylate.

In order to use the chemical composition for ink jet recording paper of the present invention in the ink receiving layer of the ink jet recording paper, it is preferable that the composition further comprises a binder component containing a hydrophilic resin as a component.

In the present invention, the hydrophilic resin as the binder component is preferably polyvinyl alcohol. In particular,
In polyvinyl alcohol, the degree of saponification is 80 to 95.
Optimally, it is 100% by weight and the degree of polymerization is 100 to 10,000. When the copolymer (D) and polyvinyl alcohol are combined, in this case, in particular, the degree of saponification of polyvinyl alcohol is 80 to 95% by weight,
When the degree of polymerization is from 100 to 10,000, the affinity for the aqueous ink for an ink jet printer is further improved, and the image quality by the ink jet printer is improved. Therefore, high-quality printing can be performed even in high-speed printing.

In the present invention, the monomer (A) and the monomer (B) or the copolymer (D) containing the monomer (A), the monomer (B) and the monomer (C) is used.
Is preferably cation-modified with a cationizing agent. When the copolymer (D) is cationically modified, the affinity and penetrability of the drug composition for the aqueous ink for an inkjet printer are enhanced. Therefore, even at the time of high-speed printing, it is possible to form an ink receiving layer of an ink jet recording paper having excellent resolution and drying properties of an aqueous ink.

The present invention also includes an ink jet recording paper on which an ink receiving layer comprising the above-mentioned chemical composition for ink jet recording paper is formed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION (Copolymerizable monomer (A)) The copolymerizable monomer (A) is represented by the above formula (1). In the above formula (1), R ² is a hydrogen atom or a lower alkyl group. Examples of the lower alkyl group for R ² include an alkyl group having about 1 to 5 carbon atoms such as a methyl group, an ethyl group, a propyl group, and an isopropyl group. Preferred R
² includes a hydrogen atom.

Examples of the copolymerizable monomer (A) represented by the above formula (1) include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate and the like. Can be. Among these, 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate (that is, 2-hydroxyethyl (meth) acrylate) are preferable.

The copolymerizable monomers (A) can be used alone or in combination of two or more.

(Copolymerizable Monomer (B)) The copolymerizable monomer (B) has a cation-modifiable group. Such cation-modifiable groups include those represented by the formula (2)
A nitrogen atom-containing group represented by is preferred. Equation (2)
In, the hydrocarbon group for R ³ and R ⁴ is not particularly limited, and examples thereof include an alkyl group and an aryl group. Examples of the alkyl group include a methyl group, an ethyl group,
Examples include a propyl group, an isopropyl group and a butyl group. The aryl group includes, for example, a phenyl group.
As the hydrocarbon group, an alkyl group having about 1 to 4 carbon atoms (particularly, a methyl group or an ethyl group) is preferable.

Preferred R ³ and R ⁴ are a hydrogen atom,
Examples thereof include an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group and an ethyl group.

Specifically, examples of the nitrogen atom-containing group represented by the above formula (2) include an amino group, a dimethylamino group, a methylethylamino group, a diethylamino group, a dipropylamino group and the like.

Such a nitrogen atom-containing group can be cation-modified with a cationizing agent.

As the copolymerizable monomer (B), the (meth) acrylic monomer having a nitrogen atom-containing group is preferably used. Examples of such a (meth) acrylic monomer having a nitrogen atom-containing group include the above-mentioned alkyl (meth) acrylate having a nitrogen atom-containing group, that is, an alkyl (meth) acrylate having a nitrogen atom-containing group represented by the following formula (3). (Meth) acrylates are preferred.

[0027]

Embedded image (In the formula, R ⁵ represents a hydrogen atom or a methyl group; R ⁶ represents a lower alkylene group; and R ³ and R ⁴ may be the same or different and represent a hydrogen atom or a hydrocarbon group.)

The lower alkylene group for R ⁶ may have a branched chain. Specifically, the lower alkylene group for R ⁶ includes, for example, a methylene group, an ethylene group, a propylene group, an isopropylene group, a butylene group and the like having 1 to 5 carbon atoms.
To some extent. Preferred lower alkylene groups include methylene, ethylene, and more preferably ethylene.

[0029] In the formula ^(3), R 3, ^{R 4} are the same as ^R 3, ^{R 4} in Formula (2).

Specifically, the alkyl (meth) acrylate having a nitrogen atom-containing group represented by the formula (3) includes dimethylaminomethyl (meth) acrylate, methylethylaminomethyl (meth) acrylate, and diethylaminomethyl. Methyl (meth) acrylate having a nitrogen atom-containing group such as (meth) acrylate, dipropylaminomethyl (meth) acrylate, dibutylaminomethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, methylethylaminoethyl (meth)
Acrylate, diethylaminoethyl (meth) acrylate, dipropylaminoethyl (meth) acrylate,
Examples thereof include ethyl (meth) acrylate having a nitrogen atom-containing group such as dibutylethyl (meth) acrylate, and propyl (meth) acrylate having a nitrogen atom-containing group. Of these, diethylaminoethyl methacrylate is most suitable.

The copolymerizable monomer (B) can be used alone or in combination of two or more.

(Copolymerizable Monomer (C)) The copolymerizable monomer (C) has at least two oxyalkylene groups in the molecule. At least two in such molecules
Examples of the copolymerizable monomer having two oxyalkylene groups include a radically polymerizable monomer having at least two oxyalkylene groups in a molecule described in JP-A-8-283653. Among them, (meth) acrylate monomers represented by the following formula (4) are most suitable.

[0033]

Embedded image (In the formula, R ⁷ represents a hydrogen atom or a methyl group. R ⁸ represents a hydroxyl group or an alkoxy group. N is an integer of 2 or more.)

In R ⁸ , examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group and a butoxy group. As the alkoxy group, a methoxy group and an ethoxy group are preferable.

Preferred R ⁸ includes a methoxy group and an ethoxy group.

N is an integer of 2 or more. Preferred n includes an integer of 2 to 20, more preferably an integer of 3 to 15.

Specifically, the (meth) acrylate monomer represented by the above formula (4) includes, for example, methoxypolyethylene glycol (meth) acrylate (the number of moles of ethylene glycol (EO) added: 3 mol), Methoxy polyethylene glycol (meth) acrylate (number of moles of ethylene glycol (EO) added: 9 moles), ethoxy polyethylene glycol (meth) acrylate (number of moles of ethylene glycol (EO) added: 9 moles)
And the like.

Preferred copolymerizable monomers (C) include alkoxy polyethylene glycol (meth) acrylate. Among these, methoxypolyethylene glycol acrylate (the number of moles of ethylene glycol (EO) added: 3 moles), methoxypolyethylene glycol acrylate (the number of moles of ethylene glycol (EO) added: 9 moles), ethoxy polyethylene glycol acrylate (ethylene glycol ( EO) moles added:
9 mol) is optimal.

The copolymerizable monomers (C) can be used alone or in combination of two or more.

(Copolymer (D)) The chemical composition for ink jet recording paper of the present invention comprises, as monomer components, a copolymerizable monomer (A) and a copolymerizable monomer (B), if necessary. A copolymer (D) containing at least a polymerizable monomer (C) is used as a component. The proportions of the copolymerizable monomer (A), the copolymerizable monomer (B), and the copolymerizable monomer (C) are not particularly limited, and for example, the copolymerizable monomer (A), the copolymerizable monomer ( B)
And the total amount of copolymerizable monomer (C), copolymerizable monomer (A) / copolymerizable monomer (B) / copolymerizable monomer (C) = 40-95 / 5-60 / 0-40 ( % By weight). The copolymerizable monomer (C) may be used as needed, but the copolymer (D) preferably contains the copolymerizable monomer (C) as a monomer component. Therefore, the ratios of the copolymerizable monomer (A), the copolymerizable monomer (B), and the copolymerizable monomer (C) are preferably the ratio of the copolymerizable monomer (A), the copolymerizable monomer (B) and the copolymerizable monomer (B). Copolymerizable monomer (A) / copolymerizable monomer (B) / copolymerizable monomer (C) = 40 based on the total amount of polymerizable monomer (C).
９０90/5 to 40/1 to 40 (% by weight), more preferably 50 to 80/5 to 35/3 to 30 (% by weight). Copolymerizable monomer (A), copolymerizable monomer (B)
And when the copolymerizable monomer (C) is within the above range,
It has excellent affinity for aqueous inks for ink jet printers, and when the copolymer (D) is used in the ink receiving layer, it is possible to improve the permeability of the aqueous inks for ink jet printers into the ink receiving layer.

The copolymer (D) is preferably cation-modified with a cationizing agent. When the copolymer (D) is cationically modified, the ink absorbency is improved, and the permeability of the aqueous ink for an ink jet printer into the ink receiving layer is increased. Further, the dye fixability by forming a complex with the dye in the aqueous ink is improved.

Examples of the cationizing agent include dialkyl sulfates such as dimethyl sulfate and diethyl sulfate, inorganic acids such as sulfuric acid, hydrochloric acid and phosphoric acid, organic acids such as acetic acid and sulfonic acid, methyl iodide, methyl chloride (methyl chloride), Alkyl halides such as methyl bromide and ethyl bromide, benzyl halides such as benzyl chloride, ethylene chlorohydrin, epichlorohydrin and the like can be used. Preferred cationizing agents include dialkyl sulfates (such as dimethyl sulfate and diethyl sulfate), alkyl halides (such as methyl chloride), and acetic acid.

The cationizing agents can be used alone or in combination of two or more.

The cationizing agent is a copolymerizable monomer (B)
Is cationically modified by cationizing a group capable of being cationically modified. Therefore, the amount of the cationizing agent used is
Any amount can be used as long as the cation-modifiable group in the copolymerizable monomer (B) can be cation-modified. For example, when the copolymerizable monomer (B) has one cation-modifiable group, the amount of the cationizing agent used is 1 to 1.5 mol per 1 mol of the copolymerizable monomer (B). It is most preferably 1 to 1.2 mol, and particularly preferably, the cationizing agent and the copolymerizable monomer (B) are equimolar. That is, it is preferable that all of the cationizing agents used contribute to cation-modifying the cation-modifiable group of the copolymerizable monomer (B), and no cationizing agent remains.

The cationizing agent may be used before the preparation of the copolymer (D), and may be used in such a manner that the copolymerizable monomer (B) is preliminarily cation-modified. Further, a cationizing agent may be used by a method of copolymerizing using the copolymerizable monomer (A), the copolymerizable monomer (B) and the copolymerizable monomer (C) and then performing cation modification using the copolymerized monomer (A). Also,
A method of using a cationizing agent together with the copolymerizable monomer (A), the copolymerizable monomer (B) and the copolymerizable monomer (C) to modify the cationizing agent before, during, or after the copolymerization reaction. May be used.

In the present invention, copolymerizable monomers (A) to (A) are used as monomer components in the copolymer (D).
Copolymerizable monomers other than (C), for example, acrylic acid,
Methacrylic acid, acrylamide, vinylpyrrolidone, vinylpyridine, ethylene glycol diacrylate, ethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, and the like can be used.

The copolymer (D) can be used in the form of a solution (particularly an aqueous solution) or an emulsion (particularly an aqueous emulsion).

(Chemical composition for ink jet recording paper) The chemical composition for ink jet recording paper of the present invention comprises a copolymer (D) as a constituent. The chemical composition for ink jet recording paper may be composed only of the copolymer (D), or may be composed of the copolymer (D) and other components. That is, the chemical composition for inkjet recording paper only needs to contain at least the copolymer (D).

Other components include a solvent, a binder component, colloidal silica and the like. Therefore, in the present invention, as the ink receiving layer (hereinafter, may be simply referred to as “receiving layer”) of the ink jet recording paper, the receiving layer composed of only the copolymer (D), the copolymer (D)
And a receiving layer composed of a binder component, a receiving layer composed of a copolymer (D) and colloidal silica, and a receiving layer composed of a copolymer (D), a binder component and colloidal silica. Note that the solvent can be removed before and after or during the formation of the receiving layer.

As the solvent, for example, water (distilled water, ion-exchanged water, etc.) and an organic solvent can be used. As the organic solvent, a water-soluble organic solvent is preferably used. As the water-soluble organic solvent, for example, alcohols such as methanol and ethanol are preferable. In the present invention, water and an organic solvent miscible with water are suitably used as the solvent, and water is most suitable. Since the solvent (particularly water) can be used even when preparing the copolymer (D) or when preparing the binder component,
It may be contained in the process of preparing the copolymer (D) or may be contained in the process of preparing the binder component. That is, a copolymer (D) containing a solvent (particularly water) and / or a binder component containing a solvent (particularly water) are prepared, and a copolymer (D) containing these solvents (particularly water) and The chemical composition for inkjet recording paper can be prepared using the binder component as it is. In addition, the solvent (particularly water) can be used at the time of preparing the pharmaceutical composition for ink jet recording paper. That is, by mixing the copolymer (D), a solvent and, if necessary, other components, a pharmaceutical composition for inkjet recording paper can be prepared.

Examples of the binder component include hydrophilic resins such as polyvinyl alcohol, polyvinyl pyrrolidone, carboxymethyl cellulose, and polyacrylamide. Of these, water-soluble polymers such as polyvinyl alcohol and polyvinyl pyrrolidone are preferred, and polyvinyl alcohol is particularly preferred. When the copolymer (D) and polyvinyl alcohol are combined, the affinity for the aqueous ink for an ink jet printer is high, the image quality of the ink jet printer is improved, and clear and clear printing can be performed.

The saponification degree of the polyvinyl alcohol is not particularly limited, but is not less than 70% (70 to 100%).
%) Is preferred, and particularly preferably 80 to 95%. If the degree of saponification of polyvinyl alcohol is lower than 70%, the affinity will be low, and the image quality by inkjet will be reduced.

As the degree of polymerization of polyvinyl alcohol,
For example, 100 to 10,000, preferably 150 to
5,000. The degree of polymerization of polyvinyl alcohol is 1
If it is less than 00, the solubility in the ink becomes high, so that bleeding occurs in the printed portion and the image quality deteriorates. On the other hand, if the degree of polymerization of polyvinyl alcohol exceeds 10,000, the viscosity of the coating material will increase, and the workability will decrease.

Such a water-soluble polymer can be mixed with a solvent (particularly water) in advance and used in an aqueous solution state or an aqueous emulsion state. In particular, it is preferable to use polyvinyl alcohol as a binder component in the form of an aqueous emulsion.

As the colloidal silica (colloidal silicic acid), a series of trade names “Snowtex” (manufactured by Nissan Chemical Industry Co., Ltd.), a trade name “Mizukasil P-832” (manufactured by Mizusawa Chemical Industry Co., Ltd.) and the like can be used. it can.

In the present invention, as described above, the chemical composition for ink jet recording paper contains at least the copolymer (D). In the chemical composition for ink-jet recording paper, the proportion of the copolymer (D) is not particularly limited, and is 20 to 100% of the total amount of the composition excluding components (solvents such as water) which can be removed by drying. It is 100% by weight, preferably 30 to 100% by weight. When the proportion of the copolymer (D) is less than 20% by weight, the affinity for the aqueous ink for an ink jet printer is reduced, and the image quality is reduced.

The chemical composition for ink jet recording paper is optimally used in the form of a solution (particularly an aqueous solution), an emulsion (particularly an aqueous emulsion). The chemical composition for an ink jet recording paper in an aqueous solution state or an aqueous emulsion state can be prepared by using a hydrophobic substrate (for example, an ester resin, an olefin resin, an acrylic resin, and an amide described below) without using an organic solvent. (A base material of a synthetic polymer such as a resin or an acetate resin), so that the working environment can be made suitable and the handling becomes easy. Further, when applied to a synthetic polymer material having a low surface energy, the chemical composition for ink jet recording paper in a solution state has an advantage that a uniform coating film can be easily formed.

Further, the pharmaceutical composition for ink jet recording paper of the present invention comprises a hydrolyzing inhibitor, an antioxidant, an ultraviolet absorber, a fungicide, and an inorganic compound powder (for example, silica, alumina, calcium carbonate, talc, (Powder such as magnesium oxide).

(Ink Jet Recording Paper) The chemical composition for ink jet recording paper of the present invention is used by applying it on a base material of ink jet recording paper to form a receiving layer for receiving an aqueous ink for an ink jet printer. be able to. That is, the ink jet recording paper of the present invention has an ink receiving layer composed of a chemical composition for ink jet recording paper.

The substrate of the ink jet recording paper is not particularly limited, but a synthetic polymer film or sheet (hereinafter sometimes collectively referred to as a “plastic film”) or paper can be suitably used. The ink composition for ink jet recording paper of the present invention is excellent not only in plastic film but also on paper, and has excellent adhesiveness. Can easily form an ink receiving layer. In addition, a base material can be used individually or in combination of 2 or more types.

In the plastic film, examples of the synthetic polymer include ester resins such as polyethylene terephthalate, olefin resins such as polyethylene and polypropylene, acrylic resins, amide resins, acetate resins, polycarbonate, polyvinyl chloride and the like. Is mentioned.

Further, as the paper, neutral or acidic paper containing fibers derived from ordinary natural pulp as a main component can be suitably used. Specifically, examples of the paper include high quality paper, medium quality paper, recycled paper, coated paper, art paper, and the like.

In the chemical composition for ink-jet recording paper of the present invention, the method of applying the ink-jet recording paper to the substrate is not particularly limited, and conventionally known coating methods such as a brush coating method, a spray coating method, and padding. A treatment method, a coating method using a bar coater, a dipping treatment method, and the like can be employed. Note that, as described above, it is preferable to use a solvent in order to enhance workability at the time of application.

The ink jet recording paper of the present invention is prepared by applying a chemical composition for ink jet recording paper on a base material of the ink jet recording paper, and drying the solvent if necessary to remove the solvent. It can be produced by forming an ink receiving layer composed of the composition on the base material of the ink jet recording paper.

The ink jet recording paper of the present invention is excellent in affinity and permeability of the ink receiving layer to the aqueous ink for an ink jet printer, and can perform clear printing with high resolution. It is also suitable for high-speed printing. Further, the fixability of the water-based ink is good, and discoloration due to touch with hands and fading due to long-term storage are extremely small.

[0066]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. (Examples 1 to 5) In a 1 L separable flask equipped with a Dim funnel, a dropping funnel, a thermometer, a nitrogen introducing tube, and a stirring device, together with 400 g of ion-exchanged water, the composition and blending amount (parts by weight) described in Table 1 Then, the copolymerizable monomer (A), the copolymerizable monomer (B), the copolymerizable monomer (C) and the cationizing agent are added, and the trade name “V
1 g of "-50" (manufactured by Wako Pure Chemical Industries, Ltd.) was added thereto, followed by stirring to dissolve. While blowing nitrogen from the nitrogen inlet tube,
The temperature was raised to 70 ° C. Thereafter, when the mixture was stirred at 70 ° C. for 8 hours, as a reaction product according to Examples 1 to 5,
In each case, a transparent liquid having a solid content of about 20% by weight was obtained.

[0067]

[Table 1]

(Comparative Example 1) A reaction was carried out in the same manner as in Example 1 except that a monomer component and a cationizing agent were used at the composition and blending amount (parts by weight) shown in Table 1, and the reaction according to Comparative Example 1 was carried out. A clear liquid having a solid content of about 20% by weight was obtained as a product.

Comparative Examples 2 to 4 Low molecular weight cationic compounds shown in Table 2 were used.

[0070]

[Table 2]

In Table 1, in the column of copolymerizable monomer (B), methoxypolyethylene glycol (n =
3) "n" of acrylate or the like represents the number of moles of ethylene glycol (EO) added to polyethylene glycol. The cationizing agent is used in an equimolar amount with the copolymerizable monomer (B). That is, the amount of the cationizing agent to be used is a molar number equal to the molar number of the copolymerizable monomer (B).

(Evaluation) Examples 1 to 5 and Comparative Examples 1 to 4
The reaction product (transparent liquid) or the low-molecular-weight cationic compound according to the above is compounded with a compound shown in Table 3 and a binder component in a compounding amount (parts by solid content) with respect to 100 parts by weight of solid content, A paint for ink jet recording paper was prepared. The reaction product (transparent liquid) according to Example 5 was used alone and was not mixed with the binder component.
That is, the paint for ink jet recording paper according to the fifth embodiment includes only the reaction product according to the fifth embodiment.
In addition, the coating materials for inkjet recording paper according to Examples 1 to 4 and Comparative Examples 1 to 4 are Examples 1 to 4 and Comparative Examples 1 to 4.
The reaction product (transparent liquid) or the low-molecular-weight cationic compound according to No. 4 and a binder component.

As a binder component, a 20% by weight aqueous solution of a hydrophilic resin was used. As the hydrophilic resin in the aqueous solution of hydrophilic resin of 20% by weight, polyvinyl alcohol was used, and the degree of polymerization and the degree of saponification are shown in Table 3.

The paint for ink jet recording paper was coated with a 100 μm thick polyethylene terephthalate film (P
ET film), and dried for 1 minute in a circulating hot air dryer at 100 ° C. to prepare an inkjet recording paper. Printing was performed on this inkjet recording paper using a product name “Bubble Jet Printer BJF-850” (manufactured by Canon Inc.). Then, the dryness of the printed portion was observed by finger touch immediately after printing, and the image quality was visually observed. In addition, the drying property was evaluated by the following "criterion of drying property",
The image quality was evaluated according to the following “image quality standard”. The evaluation result is
Also shown in Table 3.

(Criteria of dryness) ・: Ink does not adhere to the finger. X: Ink adheres to the finger.

(Criterion of Image Quality) ◎: Especially beautiful and clear printing. ○: Printed neatly. X: Not printed neatly.

[0077]

[Table 3]

As shown in Table 3, the chemical compositions for ink jet recording paper according to the examples are excellent in drying property and image quality.
In particular, a paint for inkjet recording paper containing polyvinyl alcohol as a binder component (that is, Example 1)
4), the image quality is clear and clear, and printing can be performed with extremely high image quality. That is, when the ink composition for ink jet recording paper according to the examples, especially the ink composition for ink jet recording paper according to Examples 1 to 4, is used, the ink receiving layer has excellent ink affinity and permeability. It can absorb ink quickly and has excellent drying properties and image quality. This is a combination of at least a copolymerizable monomer (A) and a copolymerizable monomer (B) as a monomer component in the reaction product (copolymer (D)) according to Examples 1 to 5. Because it is.

[0079]

The chemical composition for ink jet recording paper of the present invention is excellent in affinity and permeability for aqueous inks for ink jet printers. Therefore, the ink has excellent drying properties and can be printed with clear high quality.

Continued on the front page F term (reference) 2H086 BA15 BA35 4J002 AB032 BE022 BG071 BG132 BQ002 GK04 4J100 AL08Q AL08R AL09P BA02R BA03R BA04R BA05R BA06R BA08R BA29Q BA31Q CA04 CA05 JA13

Claims (10)

[Claims] 1. A monomer component represented by the following formula (1): (Wherein, R ¹ represents a hydrogen atom or a methyl group, R ² represents a hydrogen atom or a lower alkyl group) and a copolymerizable monomer having a cation-modifiable group. A chemical composition for ink jet recording paper comprising a copolymer (D) containing at least a reactive monomer (B) as a constituent. 2. As a monomer component, a copolymerizable monomer (A) represented by the above formula (1), a copolymerizable monomer (B) having a cation-modifiable group, and at least two The chemical composition for ink jet recording paper according to claim 1, comprising a copolymer (D) containing at least a copolymerizable monomer (C) having an oxyalkylene group. 3. The chemical composition for ink jet recording paper according to claim 1, wherein the copolymerizable monomer (A) represented by the formula (1) is hydroxyethyl (meth) acrylate. 4. The copolymerizable monomer (B) having a cation-modifiable group is represented by the following formula (2): (Wherein, R ³ and R ⁴ are the same or different and are each a hydrogen atom,
Shows a hydrocarbon group. The chemical composition for ink jet recording paper according to any one of claims 1 to 3, which is a (meth) acrylic monomer having a nitrogen atom-containing group represented by the formula: 5. The ink-jet recording according to claim 2, wherein the copolymerizable monomer (C) having at least two oxyalkylene groups in the molecule is an alkoxy polyethylene glycol (meth) acrylate. Pharmaceutical composition for paper. 6. The chemical composition for ink jet recording paper according to claim 1, further comprising a binder component containing a hydrophilic resin as a constituent component. 7. The chemical composition for ink jet recording paper according to claim 6, wherein the hydrophilic resin of the binder component is polyvinyl alcohol. 8. A polyvinyl alcohol having a degree of saponification of 80 to 95% by weight and a degree of polymerization of 100 to 10,
The chemical composition for an ink jet recording paper according to claim 7, wherein the molecular weight is 000. 9. The method according to claim 1, wherein the copolymer (D) containing the monomer (A), the monomer (B) and the monomer (C) is cation-modified with a cationizing agent. Item 10. The pharmaceutical composition for ink jet recording paper according to item 8. 10. An ink jet recording paper on which an ink receiving layer comprising the chemical composition for ink jet recording paper according to claim 9 is formed.