JPH0987561A - Coating composition for ink jet recording medium and ink jet recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ink jet recording medium excellent in water resistance, resolution, yellowing resistance and light resistance. SOLUTION: This coating composition for an ink jet recording medium contains an aqueous dispersion of a cationic microgel prepared by emulsion- polymerizing an unsaturated monomer in the presence of an aqueous solution of a cationic polymer containing tert. amino groups or quat. ammonium groups as the effective component. This is an ink jet recording medium the ink receiving layer of which is made of a coating composition. This is excellent in water resistance, resolution, yellowing resistance and light resistance.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coating composition for an inkjet recording material and an inkjet recording material.
More specifically, a coating composition for an inkjet recording material, which is excellent in water resistance and can form a high-resolution ink image on the ink receiving layer of a recording material, and an inkjet containing the coating composition in the ink receiving layer. Regarding recording material.

[0002]

2. Description of the Related Art The ink jet recording system has excellent characteristics such as low noise and high speed recording performance, and is therefore widely used in various fields such as information equipment. However, in the ink jet recording method, since a water-based ink is used, there are drawbacks such that the image formed on the recording material is bleeding with water or easily flows out.

Therefore, various methods for making images water resistant have been proposed. For example, JP-A-56-84992 describes an ink jet recording sheet containing a cationic polyelectrolyte on the surface of a support. Also, JP-A-59
JP-A-20696 describes an inkjet recording material obtained by coating or impregnating a support with a dimethyldiallylammonium chloride polymer. Further, there is described an ink jet recording sheet containing a quaternary ammonium salt type polymer electrolyte having further improved water resistance as compared with the recording sheets described in the above-mentioned two publications (JP-A-61). -252189). Further, an ink jet recording sheet is described which contains an aqueous dispersion of a cationic polymer having a tertiary amino group or a quaternary ammonium group on the surface of a support (JP-A-62-22).
1592).

However, the polymer electrolytes and polymers described in the above publications have insufficient water resistance and yellowing resistance, and there is room for further improvement.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a coating composition for an ink jet recording material which can form an ink image having high resolution, water resistance and yellowing resistance on the ink receiving layer of the recording material, and It is an object to provide an inkjet recording material containing the coating composition in an ink receiving layer.

[0006]

In order to solve the above-mentioned problems, the present inventor has conducted diligent research by paying attention to a coating composition for forming an ink receiving layer, and as a result, has found that a specific cationic microgel is an essential component. As a result of the finding that the above problems can be solved by using the coating composition contained as the above, the present invention has been completed.

That is, the present invention is an aqueous dispersion of a cationic microgel obtained by emulsion-polymerizing an unsaturated monomer in the presence of an aqueous cationic polymer solution containing a tertiary amino group or a quaternary ammonium group. Is contained as an active ingredient, and the ink-receiving layer provided on the surface of the support is formed by the ink-jet recording material coating composition. The present invention relates to an inkjet recording body.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The cationic microgel used in the present invention is obtained by emulsion-polymerizing an unsaturated monomer in the presence of an aqueous cationic polymer solution containing a tertiary amino group or a quaternary ammonium group. Is what you get. Here, the cationic polymer functions as a polymer emulsion dispersant when emulsion-polymerizing an unsaturated monomer, and is composed of the following unsaturated monomers.

That is, a cationic unsaturated monomer which is an essential constituent monomer for introducing a tertiary amino group or a quaternary ammonium group into the molecule of the cationic polymer,
And a nonionic unsaturated monomer which is an essential constituent monomer for adjusting the cationic property of the cationic polymer.

Examples of the cationic unsaturated monomer include dimethylaminoethyl (meth) acrylate (here, (meth) acrylate means the acrylate or dimemethacrylate. The same applies hereinafter), N, N
-Diethylaminoethyl (meth) acrylate, N, N
-Dimethylaminopropyl (meth) acrylamide,
Unsaturated monomers having a tertiary amino group such as N, N-diethylaminopropyl (meth) acrylamide, allylamine, diallylamine or triallylamine; unsaturated monomers having the tertiary amino group, hydrochloric acid and sulfuric acid , Salts with inorganic acids such as acetic acid; salts with unsaturated monomers having a tertiary amino group and organic acids such as (meth) acrylic acid; and unsaturated monomers containing a tertiary amino group , Methyl chloride, benzyl chloride, dimethyl sulfate, epichlorohydrin, alkyl glycidyl ether, glycidyl methacrylate, sultone, substituted sulfonates, etc. Quaternary ammonium salt-containing unsaturated monomers obtained by reaction with known quaternizing agents, etc. Is mentioned. The cationic unsaturated monomer may be used alone or as a mixture of two or more kinds. The salt is generally formed on the polymer after the cationic polymer having an unsaturated monomer having a tertiary amino group as a constituent unit is produced.

The nonionic unsaturated monomer copolymerized with the above cationic unsaturated monomer is not particularly limited, and examples thereof include alkyl (meth) acrylate, hydroxyalkyl (meth) acrylate, glycidyl (meth) acrylate. Various known compounds such as styrene and vinyl acetate can be used, and the nonionic unsaturated monomer can be used singly or as a mixture of two or more kinds. Although an anionic unsaturated monomer can be used, it is generally not preferable because the cationic polymer of the cationic polymer obtained by using the monomer is deteriorated.

In the present invention, the cationic unsaturated polymer is water-soluble, and the performance as an emulsifying dispersant during emulsion polymerization at the time of producing a microgel, and further, the cationic property of the finally obtained cationic microgel are obtained. It is necessary to consider it. Therefore, the ratio of the cationic unsaturated monomer and the nonionic unsaturated monomer used is important. Usually, the amount of the cationic unsaturated monomer used is about 10 to 70 mol%, preferably 15 to 50, based on 100 mol% of both.
Mol% and the amount of nonionic vinyl monomer used is 30
To about 90 mol%, preferably 50 to 85 mol%. When the amount of the cationic unsaturated monomer used is less than 10 mol%, the water solubility of the resulting cationic polymer is lowered, and the emulsifying and dispersing ability at the time of emulsion polymerization becomes insufficient. Even if it exceeds, the emulsifying and dispersing ability becomes insufficient and the desired cationic microgel cannot be obtained.

The method for producing the cationic polymer is not particularly limited, and various conventionally known production methods such as an aqueous solution polymerization method and a solution polymerization method using isopropyl alcohol can be applied. To supply the monomer to the polymerization reaction system,
Any method such as batch addition, divided addition, and continuous dropping may be used. Also. In the production of the polymer, a polymerization initiator, the above-mentioned monomer and, if necessary, a chain transfer agent are usually supplied under stirring under an inert gas stream and stirred at 60 to 90 ° C for 1 to 8
Copolymerization may be performed for about a time. The polymerization initiator used in the aqueous solution polymerization method is 2,2′-azobis (2-
Aminopropane) dihydrochloride, 2,2'-azobis [2-
Water-soluble azo polymerization initiators such as methylpropionamidine] dihydrochloride and 2,2′-azobis {2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl] propane} dihydrochloride can be used. On the other hand, in the case of a solution polymerization method using isopropyl alcohol, on the other hand, an oil-soluble polymerization initiator such as azoisobutyronitrile or peroxide is preferable, and the amount used is 100 parts by mol of the total amount of the monomers. It is set to about 0.03 to 1 part by mole. Further, after completion of the polymerization reaction, it can be converted into a tertiary salt or a quaternary salt by neutralizing with the above-mentioned acid or reacting with a quaternizing agent. In the case of the solution polymerization method using isopropyl alcohol, etc.,
After completion of the polymerization reaction, the solvent may be distilled off by steam distillation, if necessary, to give a tertiary salt or a quaternary salt.

In the present invention, the desired cationic microgel is produced by emulsion polymerization of the following unsaturated monomers in the presence of the aqueous cationic polymer solution obtained as described above. Is required. That is,
The unsaturated monomer used for emulsion polymerization is not particularly limited, and at least one kind of known cationic unsaturated monomer and nonionic unsaturated monomer can be used. More specifically, as the cationic unsaturated monomer, a cationic unsaturated monomer containing a tertiary amino group or a quaternary ammonium group, which is a constituent component of the cationic polymer, is used. In addition, as the nonionic unsaturated monomer, a nonionic vinyl monomer which is a constituent of the cationic polymer can be similarly used. The ratio of the unsaturated monomer used is preferably 0 to 50 mol% of the cationic unsaturated monomer and 50 to 1 of the nonionic vinyl monomer.
It is in the range of 00 mol%. Although an anionic unsaturated monomer can be used, the cationic property of the cationic polymer obtained by using the monomer is lowered,
Generally not preferred.

In the present invention, as long as a cationic microgel having a crosslinked structure can be obtained by emulsion-polymerizing the monomer in the presence of the aqueous solution of the cationic polymer, a crosslinking agent is not necessarily added during the emulsion polymerization. It may not be used in combination with the monomer. For example, when a double bond exists in the molecule of the cationic polymer which is an emulsifying dispersant (for example, a constitutional unit obtained by quaternizing a vinyl monomer having a tertiary amino group with glycidyl methacrylate is used). In the polymer to be contained), a double bond in the polymer is copolymerized with an unsaturated monomer used for emulsion polymerization to form a crosslinked structure, and therefore a crosslinker is not necessarily used.

However, when the above-mentioned cationic polymer which is an emulsifying dispersant does not have a double bond (for example, a cationic polymer containing an acetate of N, N-dimethylaminoethyl (meth) acrylate as a constituent component). (Polymer)
Since it does not function as a crosslinking agent during emulsion polymerization and the emulsion polymerization product cannot give a crosslinked structure, the desired cationic microgel cannot be obtained. Therefore, in such a case,
In order to impart a crosslinked structure and improve the water resistance of the cationic microgel, it is essential to use a crosslinking agent in combination with the above-mentioned monomer. Examples of the cross-linking agent include di (meth) acrylates such as ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, and triethylene glycol di (meth) acrylate, methylenebis (meth) acrylamide, ethylenebis (meth) acrylate. Acrylamide, bis (meth) acrylamides such as hexamethylenebis (meth) acrylamide, divinyl esters such as divinyl adibate and divinyl sebacate, allyl methacrylate, epoxy acrylates, urethane acrylates, N-methylol acrylamide, diallyl amine, diallyl Difunctional monomers such as dimethylammonium, diallyl phthalate, diallyl chlorendate and divinylbenzene; 1,3,5-triacryloylhexahydro-s-to Azine, triallyl isocyanurate, triallyl amine, triallyl trimellitate, N, N-diallyl 3 of acrylamide
Functional monomer: tetramethylolethane tetraacrylate, tetraallylpyromellitate, N, N, N ',
Examples thereof include tetrafunctional monomers such as N'-tetraallyl-1,4-diaminobutane, tetraallylamine salt, and tetraallyloxyethane.

When emulsion-polymerizing the above-mentioned monomer and, if necessary, the crosslinking agent in the presence of the aqueous cationic polymer solution obtained as described above, the polymerization temperature, the polymerization time, the polymerization initiator, and the chain transfer agent are used. There are no particular restrictions on various conditions such as the polymerization medium, and it is sufficient to appropriately determine from various conditions in known emulsion polymerization. More specifically, many of the conditions are the same as the conditions for producing the cationic polymer. The factor that directly affects the performance of the resulting cationic microgel is an important condition during the emulsion polymerization, and in the present invention, a cationic polymer that functions as an emulsion dispersant and a unit amount used for the emulsion polymerization. The proportion of the body and, if necessary, the cross-linking agent used is particularly important. The amount of the cationic polymer to be used (in terms of solid content) is 100, which is the sum of the monomers to be used for emulsion polymerization and the crosslinking agent to be used if necessary.
The amount is usually about 35 to 300 parts by weight, preferably 50 to 200 parts by weight. If the amount used is less than 35 parts by weight, the stability during emulsion polymerization is reduced and aggregates are likely to occur. On the other hand, if the amount is more than 300 parts by weight, aggregates are generated or obtained during emulsion polymerization. The water resistance of the cationic microgel tends to decrease. In the emulsion polymerization, water-soluble high-molecular-weight surfactants such as low-molecular-weight surfactants, casein, lecithin, polyvinyl alcohol, various modified starches, and acrylamide copolymers can be used as long as they do not deteriorate the performance of the resulting cationic microgel. Molecular compounds can be used.

The aqueous dispersion of the cationic microgel obtained as described above has a solid content of usually 10 to 50% by weight and an average particle diameter of usually 50 to 200 nm.

The cationic microgel has high strength,
Since it has excellent adhesion to the support, a good coating composition can be obtained even when it is used alone, and as a result, an inkjet recording material can be efficiently produced. For the purpose of reinforcing the strength of the ink receiving layer and further improving the adhesion to the support, a (meth) acrylic copolymer emulsion, a styrene / butadiene copolymer latex, a natural rubber latex, a polyvinyl alcohol, an oxidized starch There is no problem even if various well-known polymer binders such as, for example, are added, and in order to enhance the ink absorbability of the ink receiving layer, various well-known fillers such as silica, clay, talc, diatomaceous earth, calcium carbonate and alumina are added. You may mix | blend an agent.

By coating the coating composition of the present invention obtained as described above on various known supports, the inkjet recording material aimed at by the present invention can be obtained.
The support is not limited to paper or synthetic paper, various synthetic resin films can be applied, and the coating method of the coating composition is not particularly limited, and a size press, a roll coater, etc. Can be applied to a support using a coater of the form
Is usually about 0.1 to 6 g / m ² , preferably 0.2 to
It is 5 g / m ² .

Various conventionally known water-based inks can be used for the ink jet recording material of the present invention without any problem.
The water-based ink contains at least one of a water-soluble acid dye and a water-soluble direct dye, and if necessary a wetting agent,
Dye dissolving agents, antiseptics, antifungal agents, etc. are also added. Examples of the water-soluble acid dye include C.I. I. Acid Black,
C. I. Acid Blue, C.I. I. Acid Red,
C. I. Acid yellow and the like. Examples of the water-soluble direct dye include C.I. I. Acid Direct Black,
C. I. Acid Direct Blue, C.I. I. Acid Direct Red, C.I. I. Acid Direct Yellow and the like can be mentioned.

[0022]

The ink jet recording material using the coating composition of the present invention has good water resistance, so that it has a high image resolution and is also excellent in yellowing resistance and light resistance. The reason why the inkjet recording material of the present invention exhibits such characteristics is not clear, but the specific cationic microgel contained in the coating composition of the present invention and the dye in the aqueous ink are bound to each other to form a dye. It is thought that this is because elution is prevented.

[0023]

EXAMPLES The present invention will be described in more detail with reference to production examples, examples and comparative examples, but the present invention is not limited to these examples. In each example, part and%
Are by weight unless otherwise noted.

Production Example 1 (1) Production of Cationic Polymer A reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen introducing tube and a thermometer was charged with 120 parts of styrene and 40 parts of butyl acrylate.
Part, N, N-dimethylaminoethyl methacrylate 40
Parts, 100 parts of isopropyl alcohol, and 5 parts of azoisobutyronitrile as a polymerization initiator were charged and stirred to homogenize. In a nitrogen atmosphere, the temperature was raised to 80 ° C. with stirring and kept for 2 hours. Then, azoisobutyronitrile 1
Additional parts were added, and the temperature was further kept at 80 ° C. for 4 hours to complete the polymerization. Cool to 60 ° C. and add 15.3 parts acetic acid to 30
After stirring for a minute, 600 g of ion-exchanged water and 23.2 parts of epichlorohydrin were added, and the mixture was kept at 60 ° C. for 3 hours and quaternized. The solid content was adjusted to 25% with ion-exchanged water to obtain a cationic polymer aqueous solution a as an emulsifying dispersant. The pH of the aqueous solution was 5.5 and the viscosity was 200 cps. (2) Production of Cationic Microgel In a similar reaction vessel, 400 parts of the aqueous solution a and 500 g of ion-exchanged water were charged, and then styrene 100 was added with stirring.
And 1 part of divinylbenzene were added and emulsified. Then,
10 parts of a 1% aqueous solution of 2,2′-azobis (2-aminopropane) dihydrochloride was added, the temperature was raised to 80 ° C. with stirring under a nitrogen atmosphere and the temperature was kept for 4 hours to complete the polymerization, and the cation Aqueous microgel aqueous dispersion A was obtained. The solid content of the cationic microgel aqueous dispersion A was 20%, and the average particle size of the microgel measured by the light scattering method was 80 nm.

Production Example 2 (1) Production of Cationic Polymer In Production Example 1 (1), epichlorohydrin 23.2
A cation-polymer emulsifier aqueous solution b having a solid content of 25% was obtained in the same manner except that 36.2 parts of glycidyl methacrylate was used instead of the parts. The pH of the aqueous solution is 6.3,
The viscosity was 100 cps. (2) Production of Cationic Microgel After the same reaction vessel was charged with 400 parts of the aqueous solution b and 500 g of ion-exchanged water, 100 parts of styrene was added with stirring to emulsify. Then, 2,2'-azobis (2-
10 parts of a 1% aqueous solution of aminopropane) dihydrochloride was added, and the temperature was raised to 80 ° C. with stirring under a nitrogen atmosphere and the temperature was kept for 4 hours to complete the polymerization to obtain a cationic microgel aqueous dispersion B. The solid content of the cationic microgel aqueous dispersion B was 20%, and the average particle size of the microgel measured by a light scattering method was 75 nm.

Production Example 3 After 400 parts of the aqueous solution b and 550 g of ion-exchanged water were charged in the same reaction vessel, 50 parts of styrene was added with stirring to emulsify. Then, 5 parts of a 1% aqueous solution of 2,2′-azobis (2-aminopropane) dihydrochloride was added, and the temperature was raised to 80 ° C. with stirring under a nitrogen atmosphere and kept for 4 hours to complete the polymerization, Cationic microgel aqueous dispersion C
I got The solid content of the cationic microgel aqueous dispersion C is 1
It was 5%, and the average particle size of the microgel was 90 nm as measured by the light scattering method.

Production Example 4 200 parts of the aqueous solution b and 450 g of ion-exchanged water were charged in the same reaction vessel, and then 100 parts of n-butyl acrylate was added with stirring to emulsify. Then 2,2'-
10 parts of a 1% aqueous solution of azobis (2-aminopropane) dihydrochloride was added, the temperature was raised to 80 ° C. with stirring under a nitrogen atmosphere and the temperature was kept for 4 hours to complete the polymerization, and the cationic microgel aqueous dispersion D was obtained. Got The solid content of the cationic microgel aqueous dispersion D was 20%, and the average particle size of the microgel measured by the light scattering method was 90 nm.

Example 1 (Preparation of clear coating composition and ink jet recording material) 4 parts (solid content 1 part) of the cationic microgel aqueous dispersion A obtained in Production Example 1, polyvinyl alcohol (Nippon Gosei Kagaku Co., Ltd.) Manufactured by Gosenol N-300), and 4 parts of a predetermined amount of water were uniformly mixed to prepare a clear coating composition having a solid content of 5%. Then, the coating composition was applied to one side of a support (commercial high-quality paper, basis weight 63 g / m ² ) using a bar coater so that the solid content was 3 g / m ^2, and the temperature was 105 ° C. for 1 minute. It was dried to obtain an inkjet recording material.

Examples 2 to 4 In the same manner as in Example 1, except that the various cationic microgel aqueous dispersions shown in Table 2 were used in place of the cationic microgel aqueous dispersion A, the solid content concentration was 5%. A clear type coating composition was prepared. An ink jet recording material was obtained in the same manner.

Comparative Example 1 In an autoclave equipped with a stirrer, a thermometer and a pressure gauge,
200 parts of an epichlorohydrin polymer having an average molecular weight of 30,000 and 500 parts of a 30% trimethylamine aqueous solution were charged, the system was replaced with nitrogen gas, and then the reaction was carried out at 120 ° C. for 10 hours with stirring. Then, after unreacted trimethylamine was distilled off, deionized water was added to obtain a polymer electrolyte aqueous solution having a solid content of 30% (hereinafter, the solid content is referred to as Comparative Resin 1). A clear type coating composition having a solid content concentration of 5% was prepared in the same manner as in Example 1 except that the aqueous solution of Comparative Resin 1 was used in place of the cationic microgel aqueous dispersion A.
An ink jet recording material was obtained in the same manner.

Comparative Example 2 10 parts of ortho-xylyltrimethylammonium and 2 parts of divinylbenzene were placed in the same autoclave as in Comparative Example 1.
Parts, 88 parts of styrene, 400 parts of deionized water, 1 part of a cationic surfactant (Kotamin 24W, manufactured by Kao Atlas Co., Ltd.) as an emulsifier, and 0.5 part of azobisisobutyronitrile as a polymerization initiator. After charging and purging the system with nitrogen gas, polymerization was carried out at 60 ° C. for 3 hours with stirring.
An aqueous dispersion of a cationic copolymer (hereinafter, the solid content is referred to as Comparative Resin 2) was obtained. A clear type coating composition having a solid content concentration of 5% was prepared in the same manner as in Example 1 except that the aqueous solution of the comparative resin 2 was used instead of the cationic microgel aqueous dispersion A. An ink jet recording material was obtained in the same manner.

Example 5 (Preparation of coat type coating composition and ink jet recording material) 20 parts of cationic microgel aqueous dispersion A (solid content 5 parts) obtained in Production Example 1, white carbon (Shionogi Pharmaceutical Co., Ltd.)
Coated with a solid content concentration of 15% by kneading and dispersing 75 parts of manufactured product, Carplex 80), polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name Gohsenol N-300), and a predetermined amount of water. A mold coating composition was prepared. Next, support (commercial high-quality paper, basis weight 63 g / m ² ).
The coating composition was applied to one side of the above using a bar coater so as to have a solid content of 5 g / m ² and dried at 105 ° C. for 1 minute to obtain an inkjet recording material.

Example 6 In Example 5, the cationic microgel aqueous dispersion A was replaced with the cationic microgel aqueous dispersion B obtained in Production Example 2.
A coating type coating composition having a solid content concentration of 15% was prepared in the same manner except that was used. An ink jet recording material was obtained in the same manner.

Comparative Example 3 A coat type coating composition having a solid content of 15% was obtained in the same manner as in Example 5, except that the aqueous solution of Comparative Resin 1 obtained in Comparative Example 1 was used instead of the aqueous dispersion A of the cationic microgel. A composition was prepared. An ink jet recording material was obtained in the same manner.

Comparative Example 4 A coat type coating composition having a solid content concentration of 15% was obtained in the same manner as in Example 5, except that the aqueous solution of Comparative Resin 2 obtained in Comparative Example 2 was used in place of the aqueous dispersion A of the cationic microgel. A composition was prepared. An ink jet recording material was obtained in the same manner.

(Performance of Inkjet Recording Material) The performance of the inkjet recording materials obtained in Examples 1 to 6 and Comparative Examples 1 to 4 was evaluated based on the following measuring methods.
The results are shown in Table 2. (1) Yellowing resistance The recording material was left under the condition of 20 ° C. and 65% RH for 1 month, and the yellowing degree of the ink receiving layer surface of the recording material was visually observed. ◯: Almost no change, Δ: Slightly discolored, ×: Clearly discolored (2) Water resistance C.I. I. The image was solid printed with acid black ink, naturally dried for 1 hour, immersed in water at 30 ° C for 5 minutes, the image density after immersion was measured using a Macbeth densitometer RD514, and the density was immersed after immersion. The 100-percentage divided by the previous concentration was used as a measure of water resistance. The higher the value, the better the water resistance. (3) Light resistance C.I. I. Solid print with acid black ink and the resulting image at 40 ° C, 60% R with a xenon fade meter.
Irradiation was performed for 50 hours at H and an illuminance of 63 W / m ² , and the 100-percentage divided by the color density before and after irradiation was used as a guide for light resistance. The higher the value, the better the light resistance.

[0037]

[Table 1]

[0038]

[Table 2]

Claims (8)

[Claims] 1. An aqueous dispersion of a cationic microgel obtained by emulsion-polymerizing an unsaturated monomer in the presence of an aqueous cationic polymer solution containing a tertiary amino group or a quaternary ammonium group, as an active ingredient. A coating composition for an inkjet recording material, characterized in that 2. The cationic microgel is obtained by emulsion-polymerizing an unsaturated monomer and a crosslinking agent in the presence of an aqueous cationic polymer solution containing a tertiary amino group or a quaternary ammonium group. The coating composition according to claim 1. 3. The cationic polymer is a copolymer of a cationic unsaturated monomer containing a tertiary amino group or a quaternary ammonium group and a nonionic unsaturated monomer. The coating composition according to 1 or 2. 4. A copolymer of 10 to 70 mol% of a cationic unsaturated monomer containing a tertiary amino group or a quaternary ammonium group and 30 to 90 mol% of a nonionic unsaturated monomer. The coating composition according to claim 3. 5. The unsaturated monomer used in the emulsion polymerization is
The coating composition according to claim 1 or 2, which is a cationic unsaturated monomer and / or a nonionic vinyl monomer having a tertiary amino group or a quaternary ammonium group. 6. 0 to 50 mol% of a cationic unsaturated monomer containing a tertiary amino group or a quaternary ammonium group.
6. The coating composition according to claim 5, which comprises 50 to 100 mol% of a nonionic vinyl monomer. 7. The amount of the solid content of the cationic polymer used is 35 to 300 based on 100 parts by weight of the total amount of the unsaturated monomer used for emulsion polymerization and the crosslinking agent used if necessary.
The coating composition according to claim 1, which is parts by weight. 8. An ink receiving layer provided on a support,
An inkjet recording material, which is formed from the coating composition for inkjet recording material according to claim 1.