JP3151614B2 - Coating agent for inkjet recording sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording sheet coated with an ink jet printer and recorded by an ink jet printer, the color development, absorption, transparency, image uniformity and resolution of the ink. The present invention relates to a coating agent for an ink jet recording sheet which has excellent features such as water resistance (prevention of ink bleeding due to adhesion of water droplets) of a recorded image.

[0002]

2. Description of the Related Art Ink-jet printers used in personal computers and word processors have many advantages such as clearness of pictures and easy colorization in addition to quietness and high-speed printing at the time of printing. Therefore, in place of conventional slide projectors, they are often used for overhead projectors (OHPs) for presentations at conferences and at various conferences, and various ink jet recording sheets are used accordingly. Performance requirements.

Japanese Patent Application Laid-Open No. Hei 7-81213, which satisfies the performance requirements of such an ink jet recording sheet, discloses polyacrylic acid, a polyacrylic acid-based copolymer, and a cation-modified polyvinyl alcohol on one surface of a substrate sheet. And the like, an ink jet recording sheet forming a receptor layer mainly composed of a specific water-soluble resin is disclosed.

It is disclosed that this recording sheet for ink jet is effective for improving the fixing property, color forming property, drying property, transparency of the sheet and anti-blocking property of the ink, and particularly, an ink using an anionic dye. It is also described that it is effective for the fixing property of the toner.

[0005]

DISCLOSURE OF THE INVENTION The inventors of the present invention have developed a novel ink-recording sheet in which, in addition to the properties possessed by the ink-receiving layer, the ink fixing property when the ink comprising the anionic dye is used. In order to form a recording sheet having excellent water resistance without any trouble such that ink of the recorded image oozes out by further adhering water droplets, as a result of intensive research tests,
The coating agent for the ink jet recording sheet of the present invention has been completed.

[0006]

[Margins below]

[0007]

Embedded image

(B) 1 to 20% by weight of an unsaturated compound having an anionic functional group. (C) Compounds 1 and 2 represented by the following general formula (5) (wherein R ₄ and R ₅ are alkyl groups having 1 to 4 carbon atoms)
0% by weight.

[0009]

Embedded image CH ₂ ＣＨCH—COOR ₄ OR ₅

(D) The following general formula (6) wherein R ₆
Is hydrogen or a methyl group, and R ₇ is hydrogen or C 1-8
An alkyl group, an aryl group, an aralkyl group, A is an alkylene group having 2 to 4 carbon atoms, and n is an integer of 0 to 500. 20-93% by weight of the compound of formula (1).

[0011]

Embedded image CH ₂ ＣＲCR ₆ COO (AO) _n R ₇

[0012] The invention described in claim 2 of the present invention is as follows.
The other compound (E) having a double bond copolymerizable with the compounds (A), (B), (C) and (D) according to claim 1 is used as the compound (A), (B), A coating agent for an inkjet recording sheet, comprising a copolymer obtained by blending 1 to 20% by weight with respect to the total amount of C) and (D).

The invention according to claim 3 of the present invention relates to the compound (A) having the quaternary ammonium base.
The compound (B) having an anionic functional group and (A) / (B) = 1.5 to 10/1 in a weight ratio are blended with each other. It is a sheet coating agent.

According to a fourth aspect of the present invention, the copolymer is made water-soluble.
3. The coating agent for an inkjet recording sheet according to any one of 3.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The coating agent for an ink-jet recording sheet according to claim 1 of the present invention comprises: (A) 5 to 40% by weight of an unsaturated compound having a quaternary ammonium base in the side chain; 1 to 20% by weight of a compound having an acidic functional group 1 to 20% by weight of an alkoxyalkyl acrylate (C) and a compound 20 to 93 represented by the general formula (D)
It is composed of a copolymer obtained by copolymerization of 4% by weight or more of four components.

The coating agent for an ink jet recording sheet according to claim 2 is a compound having a double bond polymerizable therewith with respect to the total compounding amount of each of the compounds according to claim 1. It consists of a copolymer obtained by blending and copolymerizing a five-component compound obtained by adding (E) at 1 to 20% by weight.

The compound (A) has a cationic 4
An amino acrylate quaternary compound having a quaternary ammonium base or an amino methacrylate quaternary compound,
As the amino acrylate or methacrylate used for this, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminopropyl methacrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminobutyl methacrylate, dihydroxyethylaminoethyl methacrylate, dipropylaminoethyl methacrylate, Examples thereof include dibutylaminoethyl methacrylate.

The quaternizing agent for quaternizing includes:
For example, dimethyl sulfate, diethyl sulfate, alkyl sulfates such as dipropyl sulfate, methyl p-toluenesulfonate,
Sulfonates such as methyl benzenesulfonate,
Various halides such as alkyl phosphoric acid such as trimethyl phosphite and the like, alkylbenzyl chloride, benzyl chloride, alkyl chloride and alkyl bromide are used, and alkyl sulfate is particularly preferably used.

The amount of the compound (A) used is 5 to 40% by weight, preferably 10 to 40% by weight, based on the total amount of the four components of the unsaturated compounds (A), (B), (C) and (D). ~ 3
When the amount is less than 5% by weight, the fixability of the ink is impaired, and when the amount exceeds 40% by weight, the water resistance becomes poor.

The compound (B) is an unsaturated compound having an anionic functional group in a side chain, and specifically includes unsaturated carboxylic acids such as acrylic acid, methacrylic acid and itaconic acid and ammonium salts thereof. , Amines, salts such as sodium and potassium, 2- (meth) acrylamide-
2-methylpropanesulfonic acid, 3- (meth) acrylamidopropane-1-sulfonic acid, 2- (meth) acrylamidoethyl-1-sulfonic acid, 3- (meth) acrylamido-2-hydroxypropanesulfonic acid, p-
Sulfonate-containing (meth) acrylamides such as (meth) acrylamidomethylbenzenesulfonic acid and salts thereof, styrenesulfonic acid and salts thereof, and (phosphoric acid-containing (meth) acrylic acid comprising (meth) acryloyloxyethyl acid phosphate and salts thereof) Acid esters and the like.

The amount of the compound (B) is usually 1 to 20% by weight, preferably 3 to 20% by weight based on the total amount of the four components.
When the amount used is less than 1% by weight, it is difficult to prepare an aqueous solution, and when a crosslinkable compound is added, the reactivity with the crosslinkable compound becomes poor. On the other hand, when the content of the compound (B) exceeds 20% by weight, water resistance as a coating agent becomes poor.

The compound (C) is an alkyl acrylate compound having an alkoxylated side chain. Specific examples of the monomer include methoxyethyl acrylate, methoxymethyl acrylate, ethoxyethyl acrylate, butoxyethyl acrylate, and methoxyethoxyethyl. Acrylate and the like can be mentioned.

This compound (C) improves the water resistance when formed into a film. Although the reason is not clear, it becomes water-resistant by reacting with a specific anionic functional group and crosslinking. It is estimated that the compounding amount is 1 to 20% by weight, preferably 3 to 15% by weight, and if the amount is less than 1% by weight, the water resistance of the obtained coating agent cannot be exhibited. , More than 20% by weight does not result in a uniform solution state.

Among the preferred monomers of the compound (D), those represented by an integer of n = 0 or 1 in the general formula include, for example, methyl methacrylate, ethyl methacrylate, butyl methacrylate, lauryl methacrylate, ethylhexyl methacrylate, stearyl Methacrylate, methyl acrylate, ethyl acrylate,
Examples thereof include benzyl sothacrylate, phenyl methacrylate, cyclohexyl methacrylate, and 2-hydroxyethyl methacrylate.

Examples of the compound represented by an integer of n = 2 to 500 include polyethylene glycol (4) monomethacrylate, polyethylene glycol (23) monomethacrylate, polyethylene glycol (300) monomethacrylate, and polyethylene glycol (23). ) Monoacrylate, polypropylene glycol (23) monomethacrylate, polybutylene glycol (23) monomethacrylate, polyethylene glycol (23) monomethacrylate monomethyl ether, polyethylene glycol (23) monomethacrylate monobutyl ether, polyethylene glycol (23) monomethacrylate monostearyl Ether, polyethylene glycol (23) monomethacrylate monophenyl ether, polyethylene glycol Call (23) monomethacrylate monobenzyl ether, polyethylene glycol (23) monomethacrylate mono oleyl ether, etc., noted in parentheses is the number of polyalkylene glycol units.

Of these, the use of a compound represented by n = 0 or an integer of 1 is preferred because the adhesion between the film-forming resin and the base synthetic resin is improved. The compounding amount is 20 to 93% by weight, preferably 30 to 70% by weight. When the amount is less than 20% by weight, the water resistance as a coating agent is inferior, and when it exceeds 93% by weight, a uniform solution state is not obtained.

The compound (A) according to claim 2
Examples of the compound (E) having a double bond copolymerizable with (D) include a nitrogen-containing monomer such as vinylpyrrolidone, N-methylolacrylamide, acrylamide, and acrylonitrile; and an epoxy-containing monomer such as allyl glycidyl ether and glycidyl methacrylate. Monomers, macromonomers such as terminal methacrylate polymethyl methacrylate, terminal styryl polymethyl methacrylate, terminal methacrylate polystyrene, terminal methacrylate polyethylene glycol, terminal methacrylate acrylonitrile styrene copolymer, styrene, vinyl acetate and the like can be mentioned.

The compounding amount of the compound (E) is 1 to 20% by weight, preferably 3 to 15% by weight. When the amount is less than 1% by weight, the curing reaction with a crosslinkable compound described later is deteriorated, and when the amount is more than 20% by weight, the color development, resolution and fixability of the ink, which are the main objects of the present invention, are deteriorated.

The coating agents of the first and second aspects are excellent in antistatic effect and thus have an effectiveness as a receiving layer for an ink of an anionic dye for ink jet.

In addition, in the field of plastic films, containers, etc., it shows an effective action for preventing adhesion of static electricity such as dust and dust, and preventing the charging of electronic materials. In order to provide, the ratio of the compound (A) having the quaternary ammonium base to the compound (B) having the anionic functional group is (A) /
(B) = 1.5 to 10/1, preferably 2 to 8/1. If this ratio is less than 1.5 / 1, the properties of the cationic group cannot be sufficiently exhibited, and if it exceeds 10/1, the water resistance of the sheet will be impaired.

The copolymerization of the four components can be obtained by a polymerization reaction in a mixture of water and an alcoholic solvent such as methanol, ethanol, isopropyl alcohol (IPA) or the like. There are various types such as film and paper, and the expected effect is fully exhibited as it is.However, if the equipment is not equipped with disaster prevention equipment, there is a risk of ignition unless it is an aqueous solution type. It is desirable to impregnate as an aqueous solution at the stage.

Such water-solubilization is carried out by fractionating the alcohol-based solvent such as methanol, ethanol, IPA or the like of the obtained copolymer and converting the anionic functional group to ammonia, amine, N
It can be carried out by neutralizing with aOH, KOH or the like to adjust the pH to 3 to 6.

The coating agent of the present invention can provide water resistance to the ink receiving layer of the recording sheet. However, in order to exhibit stronger water resistance, the four components of claim 1 or claim 2 can be used. It is a more effective means to add a crosslinkable compound to a copolymer obtained by copolymerizing five components.

The crosslinking compound is preferably selected from compounds having two or more epoxy groups per molecule of ethers, melamine compounds, urethane compounds, isocyanate compounds and oxazoline compounds.

Specifically, it is an epoxy compound having 2 to 4 glycidyl groups, for example, ethylene glycol glycidyl ether, polyethylene glycol glycidyl ether, propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, glycerol polyglycidyl. Examples thereof include ether, trimethylolpropane polyglycidyl ether, and diglycerol polyglycidyl ether. One or more of these can be used.

Examples of the melamine compound include methylated melamine resin, methylbutyl mixed alkylated melamine resin, methylated benzylguanamine resin and the like.

Examples of the isocyanate compound include an anionic aqueous urethane resin and a blocked isocyanate.

As the oxazoline compound, 2.
2'-bis (2-oxazoline), 2.2 '-(1,3
-Phenylene) -bis (2-oxazoline), 2.2 '
-1.4-phenylene) -bis (2-oxazoline) and the like.

The most effective compound among these crosslinkable compounds is an isocyanate compound. The amount of the crosslinkable compound used depends on the total amount of the copolymer obtained by copolymerizing the four or five components and the crosslinkable compound. The amount is preferably 1 to 20% by weight, more preferably 5 to 20% by weight.
１５15% by weight.

The coating agent of the present invention can be produced by ordinary emulsion polymerization, but the emulsion polymerization increases the particle shape of the obtained copolymer and impairs the transparency of the film when applied to a film. Therefore,
Ethanol, methanol, polymerized in a mixed system of water and an alcoholic solvent such as IPA, and when the use of the solvent is not preferable, the solvent used after the polymerization is distilled off, and the carboxylic acid group of the polymer is converted into ammonia, amine, NaOH, It can be neutralized with an alkaline agent such as KOH and used as an aqueous solution.

The coating agent of the present invention may be biaxially stretched polyethylene terephthalate if transparency is required.
50 of cellulose triacetate, polycarbonate, etc.
~ 250μm sheet, if you do not need transparency,
It can be used as an ink-receiving layer of an ink-jet recording sheet by applying it to clay-coated paper or polystyrene or polypropylene synthetic paper.

The coating is performed by gravure coating, reverse roll coating, direct coating, and has a thickness of 0.1
A coating of about 1.0 μm is preferred.

In the formation of the ink receiving layer by the coating agent of the present invention, inorganic fine particles can be added to the coating agent, if necessary. As the inorganic fine particles, colloidal silica, alumina sol, calcium carbonate, kaolin, calcium sulfate, zinc oxide, aluminum silicate, zeolite and the like can be used.

If necessary, starch and its modified products, polyvinyl alcohol and its modified products, SBR latex, carboxymethylcellulose, hydroxymethylcellulose, polyvinylpyrrolidone and the like can be used in combination as a water-soluble binder.

Further, ethylene glycol, propylene glycol n-butyl ether, diethylene glycol n-butyl ether and the like can be added as a film forming aid.

[0046]

The coating agent for the ink jet recording sheet of the present invention is a copolymer obtained by copolymerizing a predetermined amount of four components of compounds (A) to (D), or a copolymer of these compounds (A) to (D).
Since it consists of a copolymer obtained by copolymerizing a predetermined amount of five components of compound (E) having a double bond copolymerizable with (D), it can be applied to a sheet in any form of aqueous or solvent-based. When printed with an inkjet ink, the ink exhibits excellent fixability, color development and resolution of the ink, and can provide a coating film having excellent water resistance.

In particular, the cation performance of the compound having a quaternary ammonium base in the side chain of (A) is mainly
Ink, especially ink comprising an anionic dye, is more excellent in fixability and resolution.

[0048]

The present invention will be described more specifically below with reference to examples and comparative examples. In these examples and comparative examples, "parts" indicates parts by weight and "%" indicates% by weight.

Example 1 [Production of copolymer] In a glass flask equipped with stirring blades, 200 parts of methanol and 10 parts of ion-exchanged water were used as a solvent.
0 parts, 20 parts of dimethylaminoethyl methacrylate quaternary compound as compound (A), 5 parts of acrylic acid as compound (B), 10 parts of 2-methoxyethyl acrylate as compound (C), and methyl methacrylate 55 as compound (D). And 10 parts of 2-hydroxyethyl methacrylate, and 0.5 part of azobisisobutyronitrile was added as a polymerization catalyst.
The reaction was carried out for a time to obtain a cationic copolymer solution. [Preparation of ink receiving layer]
μm biaxially stretched polyethylene terephthalate (PET)
The sheet is subjected to a corona discharge treatment, and the surface of the
A mixture of 0 parts and 50 parts of polyvinyl alcohol "PVA-217 (manufactured by Kuraray Co., Ltd.)" as a 10% aqueous solution was used as a coating agent by a bar coater at a coating amount of 15 g / m ^2.
(Solid content) and dried to form an ink receiving layer.

Example 2 200 parts of methanol of the copolymer solution prepared in Example 1 was distilled under reduced pressure at a temperature of 80 ° C.
The mixture was adjusted to H4.5, and 300 parts of ion-exchanged water was added to obtain a transparent aqueous copolymer solution. [Preparation of ink receiving layer] A mixture of 50 parts of the above aqueous copolymer solution and 50 parts of polyvinyl alcohol "PVA-217 (manufactured by Kuraray Co., Ltd.)" as a 10% aqueous solution was used as a coating agent in the same manner as in Example 1. The composition was applied to a PET sheet and dried to form an ink receiving layer.

Example 3 [Production of copolymer] In the same flask as in Example 1, 100 parts of IPA as solvent, 200 parts of ion-exchanged water, 20 parts of quaternized dimethylaminoethyl acrylate as compound (A), compound ( 2-acrylamide-2 as B)
5 parts of methylpropanesulfonic acid, 10 parts of 2-methoxyethyl acrylate as the compound (C) and 55 parts of methyl methacrylate and 10 parts of 2-hydroxyethyl methacrylate as the compound (D) were mixed, and azobisisobutyrate was used as a polymerization catalyst. 0.5 part of lonitrile was added, and the temperature was 8
The mixture was reacted at 0 ° C. under a nitrogen atmosphere for 6 hours to obtain a cationic copolymer liquid. [Preparation of ink receiving layer] The ink receiving layer was prepared in the same manner as in Example 1.

Example 4 200 parts of methanol of the copolymer solution prepared in Example 3 was distilled under reduced pressure at a temperature of 80 ° C., adjusted to pH 4.5 with 25% aqueous ammonia, and 300 parts of ion-exchanged water was added. Thus, a transparent aqueous copolymer solution was obtained. [Preparation of ink receiving layer] The ink receiving layer was prepared in the same manner as in Example 1.

Example 5 [Production of copolymer] In a flask similar to that in Example 1, 100 parts of IPA as solvent, 200 parts of ion-exchanged water, 20 parts of quaternized dimethylaminoethyl methacrylate as compound (A), compound ( 5 parts of acryloyloxyethyl cyanide phosphate as B) and 2 parts as compound (C)
10 parts of hydroxyethyl methacrylate, 55 parts of methyl methacrylate and 10 parts of 2-hydroxyethyl methacrylate as the compound (D) were mixed, and 0.5 part of azobisisobutylnitrile was added as a polymerization catalyst.
After reacting at 0 ° C. in a nitrogen atmosphere for 6 hours, the mixture was cooled, and 5 parts of ethylene glycol diglycidyl ether was added as a crosslinkable compound to obtain a cationic copolymer liquid. [Preparation of ink receiving layer] An ink receiving layer was prepared in the same manner as in Example 1.

Example 6 To the copolymer solution of Example 1 was added 10 parts of a self-emulsifying polyisocyanate "DC-3900 (manufactured by Nippon Polyurethane Industry Co., Ltd.)" as a crosslinking compound. An ink receiving layer was formed in the same manner as in the above.

Example 7 An ink receiving layer was prepared in the same manner as in Example 1 except that 5 parts of ethylene glycol diglycidyl ether was added as a crosslinking compound to the copolymer solution of Example 3.

Example 8 [Production of copolymer] In the same flask as in Example 1, 100 parts of IPA as solvent, 200 parts of ion-exchanged water, 20 parts of quaternized dimethylaminoethyl acrylate as compound (A), compound (A) 2-acrylamide-2 as B)
-5 parts of methylpropanesulfonic acid, 10 parts of 2-methoxyethyl acrylate as compound (C) and 45 parts of methyl methacrylate as compound (D), 10 parts of 2-hydroxyethyl methacrylate, and 10 parts of vinylpyrrolidone as compound (E) Was added, and 0.5 parts of azobisisobutyronitrile was added as a polymerization catalyst.
The reaction was carried out for 6 hours in a nitrogen atmosphere to obtain a cationic copolymer liquid. [Preparation of ink receiving layer] The ink receiving layer was prepared in the same manner as in Example 1.

Comparative Example 1 [Production of copolymer] In a glass flask equipped with stirring blades, 200 parts of IPA as a solvent and 100 parts of ion-exchanged water were used.
Part, dimethylaminoethyl methacrylate quaternary product 30
Parts, methyl methacrylate 40 parts, ethyl acrylate 30
Were mixed and 0.5 parts of azobisisobutyronitrile was added as a polymerization catalyst, and the mixture was reacted at a temperature of 60 ° C. under a nitrogen atmosphere for 6 hours to obtain a cationic copolymer liquid. The copolymer was distilled at a temperature of 80 ° C. under reduced pressure, and isopropyl alcohol was distilled off. Deionized water was added, but the resin did not become a transparent resin solution and was in a cloudy state. [Preparation of ink receiving layer] The ink receiving layer was prepared in the same manner as in Example 1.

Comparative Example 2 [Production of copolymer] In a glass flask equipped with stirring blades, 200 parts of IPA as a solvent and 100 parts of ion-exchanged water were used.
Parts, dimethylaminoethyl methacrylate quaternary compound 60
Parts, 20 parts of methyl methacrylate and 40 parts of ethyl acrylate
Were mixed and 0.5 parts of azobisisobutyronitrile was added as a polymerization catalyst, and the mixture was reacted at a temperature of 60 ° C. under a nitrogen atmosphere for 6 hours to obtain a cationic copolymer liquid. [Preparation of ink receiving layer] The ink receiving layer was prepared in the same manner as in Example 1.

Comparative Example 3 [Production of copolymer] In a glass flask equipped with stirring blades, 200 parts of IPA as a solvent and 100 parts of ion-exchanged water were used.
Part, dimethylaminoethyl methacrylate quaternary compound 10
Parts, 10 parts of acrylic acid, 40 parts of methyl methacrylate and 40 parts of ethyl acrylate, and 0.5 part of azobisisobutyronitrile was added as a polymerization catalyst, and the mixture was reacted at a temperature of 60 ° C. under a nitrogen atmosphere for 6 hours. However, the obtained copolymer liquid became cloudy and solidified during the reaction, and could not be used as a coating liquid for the ink receiving layer.

[Evaluation and Results] Using an ink jet printer (BJ820J manufactured by Canon), printing was performed using each recording sheet having an ink receiving layer formed of the copolymer of Examples 1 to 8 and Comparative Examples 1 to 3 as a sample. With respect to the performance of the ink receiving layer, the fixing property of the ink, the coloring property of the ink, the resolving power of the ink, and the strength of the water-resistant coating film were evaluated as described below. 1) Ink fixability A test pattern was printed on a recording sheet, left standing in a dry state at a temperature of 50 ° C. for one week, and the presence or absence of ink bleeding was visually evaluated. ○: No exudation ×: Exudation 2) Color development of ink k-haze meter 1001DP manufactured by Nippon Denshoku Industries Co., Ltd.
Was used to measure the sheet turbidity. ；: Turbidity of 7.0 or less ×; turbidity of 7.0 or more 3) Resolution of Ink Bleeding was visually evaluated by printing a plurality of heavy-colored lines. ；: Good resolving power ×: poor resolving power 4) Water-resistant coating film strength The ink receiving layer was immersed in water and rubbed with a finger to observe the state of the coating film. ◎: Very good coating condition ○: Good coating condition ×: Poor coating condition

[0061]

[Table 1]

[0062]

The coating agent for the ink jet recording sheet of the present invention is a copolymer obtained by copolymerizing a predetermined amount of the four components (A), (B), (C) and (D), or It consists of a copolymer obtained by copolymerizing a predetermined amount of the five components of the compound (E) having a double bond copolymerizable therewith, and can be applied to the sheet in any of an aqueous or solvent form. When printing with an inkjet ink, the ink has good fixability, color developability, and resolving power, and can form particularly excellent water-resistant coating film strength.

In particular, the coating agent for the ink jet recording sheet of the present invention is characterized in that the cationic properties of the above-mentioned (A) and the compound having a quaternary ammonium base in the side chain of (A) are reduced from the ink, especially the anionic dye. This has the advantage of further improving the fixability and resolution of the ink.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-272830 (JP, A) JP-A-10-264511 (JP, A) JP-A-9-87561 (JP, A) JP-A-11- 29738 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41M 5/00

Claims (4)

(57) [Claims] 1. An ink jet recording sheet comprising a copolymer obtained by copolymerizing a predetermined amount of compounds of the following four components (A), (B), (C) and (D). Coating agent. (A) The following general formula (1) wherein R ₁ is a hydrogen atom or a methyl group, R _{2 to} R ₄ are a hydrogen atom or an alkyl group which may have a substituent having 1 to 9 carbon atoms, m Is an integer of 1 to 10, and X ⁻ is an anion of a quaternizing agent.
5 to 40% by weight of a compound having a secondary ammonium base. Embedded image (B) Unsaturated compounds 1-2 having an anionic functional group
0% by weight. (C) Compounds 1 to 2 represented by the following general formula (where R ₄ and R ₅ are alkyl groups having 1 to 4 carbon atoms)
0% by weight. CH ₂ ＣＨCH—COOR ₄ OR ₅ (D) wherein R ₆ is hydrogen or a methyl group, R ₇ is hydrogen or an alkyl group having 1 to 8 carbon atoms, aryl A group, an aralkyl group, A is an alkylene group having 2 to 4 carbon atoms, and n is an integer of 0 to 500). Embedded image CH ₂ ＣＲCR ₆ COO (AO) _n R ₇ 2. The compound (A), (B) according to claim 1,
The other compound (E) having a double bond copolymerizable with (C) and (D) is converted to the compound (A), (B), (C)
A coating agent for an ink jet recording sheet, comprising a copolymer obtained by mixing 1 to 20% by weight with respect to the total amount of (D) and (D). 3. The compound (A) having a quaternary ammonium base and the compound (B) having an anionic functional group are blended in a weight ratio of (A) / (B) = 1.5 to 10/1. The coating agent for an ink jet recording sheet according to claim 1, wherein 4. The coating agent for an ink jet recording sheet according to claim 1, wherein the copolymer is made water-soluble.