JP2003191602A - Acceptive composition for ink jet recording and ink jet recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink jet recording medium having excellent smoothness, water resistance, ink fixability and recording image accuracy. <P>SOLUTION: An acceptive composition for ink jet recording comprises (a) an aqueous cationic resin of 90 to 25 pts.wt. in terms of solid content (and (b) a hydrophobic silica of 10 to 70 pts.wt. [wherein (a) + (b)=100 pts.wt.]. The ink jet recording medium comprises a layer made of the composition on at least one side surface of a base. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an inkjet recording receiving composition and an inkjet recording medium, and more particularly to an inkjet recording receiving composition which is excellent in coating workability and can form a recorded image with excellent accuracy. The present invention also relates to an inkjet recording medium excellent in smoothness, water resistance, ink fixing property, and recorded image accuracy.

[0002]

2. Description of the Related Art Conventionally, as an ink jet recording medium, a porous inorganic pigment or a cationic resin has been mainly used on a substrate having a poor ink absorbability such as a paper whose sizing degree is adjusted at the time of paper making or high quality paper. It is known that an ink receiving layer is provided by applying a composition as a component.

However, with the widespread use of the ink jet recording system, there are various methods used at the end, and more advanced characteristics are required for the ink jet recording medium. The inkjet recording medium is required to have the following performance. (1) An image having excellent color development of ink and high density and saturation can be obtained. (2) A sharp image can be obtained with less ink bleeding. (3) To quickly absorb the adhered ink droplets. (4) The recorded image is excellent in storage and does not change due to water, light, etc. (water resistance, weather resistance).

However, the recording medium prepared by treating the paper during the conventional papermaking has a limit in the obtained performance. For this reason, it is difficult to meet the detailed demands of the user nowadays because of the wide variety of usage methods and usage environments. Further, recently, the preservation of recorded images has been emphasized, but existing recording media having an ink-receiving layer on a base material can be used as a base material unless a treatment such as surface coating is performed after the ink image is received. It sucks in water,
The current situation is that it becomes fragile and inferior in long-term storage stability.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the prior art and provides an ink jet recording receiving composition for obtaining an ink jet recording medium satisfying all of the above required performances at a high level. For the purpose of provision.

[0006]

According to the present invention, (a) 90 to 25 parts by weight of an aqueous cationic resin in terms of solid content and (b) 10 to 75 parts by weight of hydrophobic silica [where (a) +
(B) = 100 parts by weight]. The above-mentioned (b) hydrophobic silica has an average particle size of 50 to 50 in the receiving composition as measured by a dynamic light scattering method.
It is preferably 5,000 nm, and the hydrophobic silica is preferably one that has been subjected to a treatment for imparting hydrophobicity to the surface. The present invention also relates to an inkjet recording medium having a layer comprising the inkjet recording receiving composition on at least one surface of a substrate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The (a) aqueous cationic resin of the present invention can be optionally selected from known cationic resins conventionally used in ink jet recording receiving compositions and used. Those which can be arbitrarily dispersed or dissolved in are selected. The aqueous cationic resin of the present invention contains an aqueous emulsion such as latex.

As the component (a), a known resin, a cationic resin obtained by reacting an emulsion latex with an amine and / or ammonia, a fourth resin
A cationic resin obtained by (co) polymerizing a cationic monomer having a primary ammonium base, a cationically modified water-soluble polymer such as polyvinyl alcohol (PVA), methyl cellulose, starch, gelatin, etc., emulsion particles during polymerization Examples thereof include a cationic emulsion prepared so that its surface becomes cationic, a nonionic or anionic latex and an emulsion which is pseudo-cationic using a cationic surfactant. These may be used alone or in combination.

Examples of the cationic resin obtained by reacting with an amine or the like include a cationic resin obtained by reacting an amine with epihalohydrin. As the amine, methylamine, dimethylamine,
Examples include trimethylamine, ethylamine, propylamine, ethanolamine, ethylenediamine, diethylenetriamine and cyclohexylamine. Examples of epihalohydrin include epichlorohydrin and epibromohydrin.

The cationic resin having a quaternary ammonium salt group is, for example, a quaternary ammonium salt monomer obtained by reacting a monomer having a tertiary amino group with an alkylating agent, alone or by another copolymerization. A monomer having a tertiary amino group, or a monomer having a tertiary amino group, or a copolymerizable monomer, and then quaternized with an alkylating agent, or a quaternary ammonium salt monomer is directly added. It can be obtained by polymerization or copolymerization. The monomer having a quaternary ammonium salt group may be a single monomer or two or more kinds. Further, as the cationic resin, a silane coupling agent having a quaternary ammonium salt structure which is hydrolyzed and polycondensed may be used.

The cation-modified PVA is a PVA having a primary to tertiary amino group or a quaternary ammonium group in the main chain or side chain of PVA, and is an ethylenically unsaturated monomer having a cationic group. It is obtained by saponifying a copolymer with vinyl acetate. Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl. (2-acrylamido-2,2-dimethylethyl) ammonium chloride, trimethyl. (3-acrylamido-3,
3-dimethylpropyl) ammonium chloride, N-
Vinylimidazole, N-vinyl-2-methylimidazole, N- (3-dimethylaminopropyl) methacrylamide, hydroxylethyl trimethylammonium chloride, trimethyl (methacrylamidopropyl) ammonium chloride, N- (1,1-dimethyl- 3-dimethylaminopropyl) acrylamide and the like can be mentioned. The ratio of the cation-modified group-containing monomer of the cation-modified PVA is 0.1 to 10 mol%, preferably 0.2 to 5 mol% with respect to vinyl acetate.

Among the above, a cationic resin having a quaternary ammonium salt group and a cation-modified PVA are preferable, and a water-soluble polymer having an alkyl (meth) acrylate quaternary ammonium salt as a skeleton is particularly preferable. . (A)
As a component, specifically, a water-soluble cationic (meth) acrylic acid resin manufactured by Harima Chemicals Co., Ltd., trade name "C"
P-4 ", a cation-modified PVA manufactured by Kuraray Co., Ltd., a trade name" CM318 ", a cationic special modified polyurethane latex manufactured by Dainippon Ink and Chemicals, Inc., a trade name" Patera Call IJ-2 ", etc. Can be mentioned.

The pH of the aqueous solution of the component (a) is preferably 1.5 to 6.9, more preferably 2.0 to 6.0, and particularly preferably 2.5 to 5.5. If PH is less than 1.5, there is a risk of adversely affecting the color developability of the ink. On the other hand, if it exceeds 6.9, the effect on the ink fixability may be poor. The viscosity of the aqueous solution of the component (a) is
When measuring using a B-type rotational viscometer, at 6 rpm,
Preferably 20 to 10,000 mPa · s, more preferably 50 to 8,000 mPa · s, particularly preferably 1
It is from 00 to 6,000 mPa · s. Also, 60 rpm
Is preferably 5 to 9,000 mPa · s, more preferably 20 to 7,000 mPa · s, and particularly preferably 30.
˜5,000 mPa · s. When the amount is less than the above preferable range, the amount of the viscosity modifier used for improving the coating suitability is increased, which adversely affects other properties such as fixability and water resistance. On the other hand, when the amount exceeds the above preferred range, the miscibility with other raw materials becomes extremely poor, and a uniform composition cannot be obtained.

The content of the (a) aqueous cationic resin (as solid content) contained in the composition of the present invention is 90 to 2 when the total amount of the (a) component and the (b) component is 100 parts by weight.
5 parts by weight, preferably 75 to 30 parts by weight, more preferably 70 to 35 parts by weight. If it is less than 25 parts by weight, the viscosity of the composition becomes high and the viscosity becomes thixotropic, so that the coating property is deteriorated. Further, since the amount of solvent introduced at the same time as the hydrophobic silica increases, the working environment becomes worse. Further, the ink fixability of the recording medium coated with the composition deteriorates. On the other hand, when the amount exceeds 90 parts by weight, the amount of hydrophobic silica in the receiving composition decreases, so that the water resistance required as an inkjet recording medium cannot be maintained.

Next, as the hydrophobic silica (b) of the present invention, any of amorphous silica produced by a dry method or anhydrous silica produced by a wet method may be used as a raw material. The component (b) is obtained by subjecting the surface of this amorphous silica to a treatment for imparting hydrophobicity, and it is preferable that the hydrophobicity is extremely strong.

Examples of the hydrophobicity-imparting treatment include surface coating of amorphous silica with waxes such as paraffin wax, carnauba wax, amide wax, and polyethylene wax. The resulting hydrophobic silica exhibits hydrophobicity because the -OH group on the surface of the amorphous silica is covered with the wax layer. Further, organic silicon compounds such as tetramethylsilane, vinyltrichlorosilane, vinyltrimethoxysilane, silane containing epoxy groups, dimethyldichlorosilane, and organic compounds containing amino groups are added to amorphous silica and modified by hydrolysis or the like. There is also a thing. The obtained hydrophobic silica is one in which the —OH group on the surface of amorphous silica is chemically reacted with an organic silicon compound or the like, and has a hydrophobic group such as an alkyl group on the particle surface. Therefore, it exhibits a high hydrophobicity.

The average particle size of the hydrophobic silica (b) of the present invention is 50 to 5,000 nm as measured by the dynamic light scattering method,
The thickness is preferably 100 to 4,000 nm, more preferably 150 to 3,500 nm. If it is less than 50 nm, the viscosity of the composition of the present invention becomes extremely high, the coating suitability of the composition is deteriorated, and good coating properties cannot be obtained. on the other hand,
If it exceeds 5,000 nm, the coated surface coated with the composition of the present invention becomes rough, and the powder drop becomes severe, and the accuracy of the image when ink jet recording is performed becomes poor. The dynamic light scattering method can be measured by using, for example, a laser particle size analysis system LPA3000 manufactured by Otsuka Electronics Co., Ltd. The component (b) of the present invention may be used alone, but in order to adjust the voids in the coating layer, two or more kinds having different particle sizes may be used in combination.

The hydrophobicity of the component (b) can be measured by the following aqueous solution transmittance method, and is preferably 50 to 100%, more preferably 65 to 100%, particularly preferably 75 to 100%.
Is. If the hydrophobicity is less than 50%, the component (b) cannot be said to be hydrophobic and the desired water resistance cannot be obtained. The hydrophobicity obtained by the aqueous solution transmittance method is a value measured as described below. A sample (1 g) is weighed in a separating funnel (200 ml), 100 ml of pure water is added to the funnel, the bottle is stoppered, and the mixture is shaken for 10 minutes in a Turbula mixer and then left standing for 10 minutes.
After leaving still, 20-30 ml of the lower layer was extracted from the funnel, and then the mixed solution of the lower layer was dispensed into a quartz cell (10 mm).
Pure water was used as a blank on a spectrophotometer and the
Let the permeability of the aqueous solution of m be the hydrophobicity.

The hydrophobic silica (b) can be treated as a dispersion liquid which is usually dispersed in water containing an organic solvent capable of dissolving 1% by weight or more in water. Examples of the organic solvent for the dispersion include alcohols such as methanol, ethanol, isopropanol, and n-propanol, ethylene glycol, diethylene glycol,
Glycols such as ethylene glycol monobutyl ether, acetic acid polyhydric alcohols such as ethylene glycol monobutyl ether acetate and diethylene glycol monobutyl ether acetate (butyl carbitol acetate), esters such as ethyl acetate and propyl acetate, ketones such as acetone and methyl ethyl ketone , N, N-
One kind or two or more kinds of amides such as dimethylformamide are used in combination. In this case, the amount of the organic solvent used is preferably less than the amount of water used.

The content of the component (b) in the dispersion is not particularly limited, but if it is less than 5% by weight, the solid content of the receiving composition may be extremely low, which is preferable. Absent. In the production of the dispersion liquid, it is preferable to perform sufficient stirring in the process of dispersing the component (b) in the dispersion solvent. Examples of the stirrer used include a rotary mixer, an inversion type (reciprocating rotary type) mixer, and a jet stirring type mixer. Among them, the rotary mixer is preferable.

Various additives can be added when preparing the dispersion liquid of the hydrophobic silica. For example, various nonionic or cationic surfactants, defoamers,
Preservatives, inorganic salts, pH adjusters and the like can be appropriately used as necessary.

The pH of the hydrophobic silica dispersion is preferably 1.5 to 7.5, more preferably 2.0 to 7.0.
Particularly preferably, it is 3.0 to 6.5. If PH is less than 1.5, there is a risk of adversely affecting the color developability of the ink. On the other hand, when it exceeds 7.5, the miscibility with the cationic resin may be deteriorated, and problems such as generation of aggregates and abnormal thickening of the receiving composition may occur.

The composition of the present invention may further contain an aqueous emulsion such as a latex. The water-based emulsion is a known water-based emulsion such as (meth) acrylic ester-based or urethane-based, but it is desirable that it has nonionic electric characteristics, and if a large amount of anion-based emulsion is used, aggregates may occur. There is a nature.

The ink jet recording receiving composition of the present invention may further contain a binder for stably adhering the component (b) to at least one surface of the substrate. Examples of the binder used include various water-soluble polymers. For example, PVA, modified PVA, polyvinylpyrrolidone, polyethylene oxide, polyacrylamide, partially saponified polyvinyl acetate, oxidized starch, etherified starch, carboxymethyl cellulose and other cellulose derivatives, various sugars, pullulan, casein, gelatin, soybean protein, Examples include maleic acid resins. Among these, PVA is preferable in terms of ink absorbability. These may be used alone or in combination of two or more.

Other additives used in the present invention include, for example, various nonionic or cationic surfactants, defoamers, antioxidants, ultraviolet absorbers, light stabilizers, preservatives and pH adjusters. Further, various known additives such as a fluorescent dye, a viscosity stabilizing (adjusting) agent, a pigment dispersant, a coloring agent and a lubricant can be further added. Furthermore, in order to obtain a delicate balance between the effect of increasing the amount and the performance, hydrophilic fillers such as unmodified silica, calcium carbonate, aluminum hydroxide, and titanium oxide may be appropriately added at a level that does not impair the water resistance.

The ink jet recording receiving composition of the present invention is usually obtained by stirring and mixing the above (a) aqueous cationic resin aqueous solution, (b) hydrophobic silica dispersion and various additives.

In the process of mixing the dispersion liquid of the component (b), it is preferable to perform sufficient stirring. Examples of the stirrer used include a rotary mixer, an inversion type (reciprocating rotary type) mixer, and a jet agitation type mixer. Among them, an inversion type mixer in which bubbles are hard to be involved is preferable. In some cases, it is preferable to use a disperser during or after the addition to uniformly disperse. As the disperser, for example, a ball mill, an attritor, a sand mill, a homomixer,
Examples include Microfluidizer (manufactured by Microfludex), Nanomizer (manufactured by Nanomizer), and Vibro mixer (manufactured by Chilling Industry Co., Ltd.).

The mixed liquid thus obtained has a large number of minute lump-like aggregates, bubbles and the like when viewed microscopically. Such fine lump-like aggregates are reduced by performing the subsequent dispersion treatment, filtration treatment, and the like. As the dispersion treatment method, various conventionally known dispersers such as a high speed rotation disperser, a medium stirring type disperser (ball mill, sand mill, etc.), an ultrasonic disperser, a colloid mill disperser, a roll mill disperser, a high pressure disperser, etc. are used. You can do it. The above dispersion treatment methods can be used in combination of two or more. The filtration treatment is preferably 20 to 200 mesh filtration, more preferably 60 to 80 mesh filtration. If necessary, various additives, binders and the like can be added in any of the mixing, dispersing and filtering treatment steps.

The viscosity of the composition of the present invention obtained as described above is measured by using a B-type rotational viscometer, although it varies depending on the coating method, coating apparatus, coating amount, etc. used for coating. In this case, it is preferably 250 to 70,000 at 6 rpm.
mPa · s, more preferably 500 to 30,000 m
Pa · s, particularly preferably 1,000 to 10,000 m
Pa · s. Also, at 60 rpm, preferably 50 to
9,000 mPa · s, more preferably 100 to 5,
000 mPa · s, particularly preferably 200 to 2,000
It is mPa · s. If it is less than the above preferred range, liquid dripping occurs during coating, and a uniform coating layer cannot be obtained. On the other hand, when the amount exceeds the above-mentioned preferable range, it is difficult to control the coating amount, and the optimum coating amount cannot be obtained. In addition, the pH of the composition
Is preferably 1.5 to 6.9, more preferably 2.
It is 0 to 6.0, and particularly preferably 2.5 to 5.5. P
If H is less than 1.5, there is a risk of adversely affecting the color developability of the ink. On the other hand, if it exceeds 6.9, the effect on the ink fixability may be poor.

The base paper used as the base material of the present invention is made of wood pulp as a main raw material, and if necessary, synthetic paper such as polypropylene or synthetic fiber such as nylon or polyester is used in addition to wood pulp. As wood pulp, LBKP, LBSP, NBKP, NBS
Any of P, LDP, NDP, LUKP and NUKP can be used, but LBKP and NBS with a large amount of short fibers
It is preferable to use more P, LBSP, NDP, and LDP. As the above pulp, a chemical pulp (sulfate pulp or sulfite pulp) having few impurities is preferably used, and a pulp having a whiteness improved by bleaching is also useful.

The base paper contains sizing agents such as higher fatty acids and alkyl ketene dimers, white pigments such as calcium carbonate, talc and titanium oxide, paper strength enhancers such as starch, polyacrylamide and PVA, optical brighteners and polyethylene. A water retaining agent such as glycols, a dispersant, a softening agent such as quaternary ammonium, and the like can be appropriately added.

The base paper can be given a high smoothness by calendering at the papermaking stage or after the papermaking. The base paper density is generally 0.7 to 1.2 g / m ² (JIS-P-8118). Furthermore, the stiffness of base paper is JIS-P-8143.
20 to 200 g is preferable under the conditions specified in 1.

A surface sizing agent may be applied to the surface of the base paper, and as the surface sizing agent, the same sizing agent as that which can be added to the base paper can be used. The pH of the base paper is J
It is preferably 5 to 9 when measured by the hot water extraction method specified in IS-P-8113.

In the present invention, on at least one surface of the substrate,
The inkjet recording receiving composition of the present invention is applied using a coating device or a size press device to form an inkjet recording medium. The coating device may be either an on-machine coater or an off-machine coater, and a conventionally known air knife coater, die coater, blade coater, gate roll coater, bar coater, rod coater, roll coater, gravure coater, curtain coater, etc. Can be used.

The coating liquid is dried by blowing hot air after the above coating. The temperature and volume of the hot air at this time may be appropriately changed depending on the substrate and the coating liquid used, but for example, the temperature of the hot air is preferably about 50 ° C to 160 ° C. More preferably, it is 80 ° C to 140 ° C. When the temperature is 50 ° C. or higher, the drying time can be suppressed within a practical range, and when the temperature is 160 ° C. or lower, the base material and the coating solution can be prevented from being modified. After coating, machine calendar, super calendar,
The surface may be smoothed by calendering with a soft calender.

In the recording medium of the present invention, the layer of the ink jet recording receiving composition formed on at least one surface of the substrate as described above preferably has a solid content coating amount of 1 to 15 g / m 2. ² , more preferably ^{2 to} 12 g /
m ² . If it is less than 1 g / m ² , the print density is lowered during image formation, feathering and bleeding occur, and it is not possible to maintain good character quality and image quality. On the other hand, 15 g / m
^If it exceeds ² , powder is likely to fall off, and it is not practical because it becomes expensive in terms of cost commensurate with performance.

When an image is recorded using the ink jet recording medium of the present invention, it is possible to use an aqueous dye ink, an aqueous pigment ink, an oily pigment ink and the like. In particular, a recording method using an aqueous ink is preferable. preferable. The aqueous ink referred to in the present invention is a recording liquid containing the following colorant, liquid medium, and other additives. As the colorant, a direct dye, an acid dye, a basic dye, which are known in inkjet,
Water-soluble dyes or water-dispersible pigments such as reactive dyes or food dyes can be used.

[0038]

The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In addition, parts and% in the examples
Are parts by weight and% by weight unless otherwise specified.

Various evaluations will be described below. Dynamic light scattering measurement of average particle size Otsuka Electronics Co., Ltd., Laser particle size analysis system LPA
It was measured using 3000. The hydrophobicity obtained by the hydrophobic (hydrophobicity) aqueous solution transmittance method was measured using a spectrophotometer manufactured by JASCO Corporation.

Preparation of recording media for composition evaluation and
Evaluation The base material used for coating the ink jet recording receiving composition was a commercially available neutral high-quality paper having a basis weight of 70 g and a thickness of 9 g.
0 μm, density 0.8 g / cm ² (JIS-P-811
8) and pH were 7.0 (JIS-P-8133). A wire bar coater was used as a method for coating the base material, and after coating, hot air at 105 ° C. was blown to dry the coating liquid. The formed layer of the ink jet recording receiving composition had a solid content of 10 g / m ² . An image was formed on each of the prepared recording media by using an inkjet printer (PM780C manufactured by Epson Corporation), and the following evaluations were performed on the printed recording media.

Coating workability Evaluation was made according to the following evaluation criteria. ⊚: With a predetermined sample amount, there is no problem in coating the target area. ◯: With the predetermined sample amount, there is no problem in coating the target area. ○ △: The sample can be applied and the target sample can be obtained. X: Coating is difficult and there are coating unevenness and uncoated portions. Coated paper dust removal The cellophane tape attached to the coated surface was peeled off, and the state of the filler adhered to the tape surface was visually determined and evaluated according to the following evaluation criteria. ⊚: No powder fall off. ◯: Although powder was removed, it was extremely small. X: The filler is not fixed to the coating layer, and powder is often removed.

Smoothness (Surface feeling) The feel of the coated surface was evaluated according to the following evaluation criteria. ⊚: The feel is extremely smooth. (The surface of the coated paper is glossy) ○: The touch is smooth. Δ: The fingertip feels rough and remains powdery. Coloring property In comparison with commercially available inkjet-dedicated paper, it was evaluated by visual evaluation according to the following evaluation criteria. ◯: A desired color can be obtained without any particular problem. X: The desired color cannot be obtained.

Bleeding The printed area was observed with a magnifying glass and evaluated according to the following evaluation criteria. ○: The white 0.25 point line can be clearly discriminated. Δ: A blank 0.25 point line can be identified. X: White 0.25 point line cannot be identified. Water resistance After dropping a water drop on the printed portion, the result of scraping was observed after 30 seconds, and the result was evaluated according to the following evaluation criteria. ⊚: The rub marks are completely clean. ◯: Scratch marks are slightly visible. X: The rubbed marks are heavily soiled. XX: Ink bleeding was generated by dropping water droplets.

Ink Fixability The area immediately after printing was rubbed, and the bleeding state was evaluated according to the following evaluation criteria. ◯: No scratches were left on the surface. ○ △: The traces of rubbing slightly blur. B: Marks of rubbing are heavily soiled. Strike-through resistance The back surface of the coated paper after printing was observed and evaluated according to the following evaluation criteria. ○: There is no strike through of the ink. Δ: There is almost no strike through of the ink. (It may be observed in a very small part) Δ ×; Although the strike-through portion of the ink is always observed, the degree is small.

The components (a) and (b) used are shown below. (A) Aqueous cationic resin (a-1); Water-soluble cationic (meth) acrylic acid resin, manufactured by Harima Kasei Co., Ltd., trade name "CP-4", 20
~ 21% aqueous solution (a-2); cation-modified PVA, manufactured by Kuraray Co., Ltd.
Product name "CM318" (powdered product)

(B) Hydrophobic silica (b-1); manufactured by Nippon Aerosil Co., Ltd., trade name "Aerosil R812", average particle diameter 45 nm, hydrophobicity 85% (b-2); manufactured by Nippon Aerosil Co., Ltd. Name "Aerosil R972", average particle size 150 nm, hydrophobicity 80
% (B-3); manufactured by Fuji Silysia Chemical Ltd., trade name “Syrohobic 200”, average particle size 3,300 nm,
Hydrophobicity 91% (b-4); Mizusawa Chemical Co., Ltd., trade name "Mizukasil P-363", average particle size 8,000 nm, hydrophobicity 73% (b ') Hydrophilic silica (b'-1) Manufactured by Fuji Silysia Chemical Ltd., trade name “Sylysia 320”, average particle diameter 1,800 nm, hydrophobicity 1.8%

Examples 1 to 8 and Comparative Examples 1 to 4 (a-1) 350 parts (solid content 70 parts) was mixed with 30 parts of water to an aqueous solution, and 90 parts of water was mixed with 30 parts of (a-2). 120 parts of the prepared aqueous solution (cationic PVA concentration 25%) was added to prepare a 20% solution of the component (a). (B) Component 9
8 parts and 2 parts of an amine salt type cationic surfactant (manufactured by San Nopco Ltd., trade name Nopcos Perth 092) are dispersed in a dispersion solvent (water / butyl carbitol acetate = 450 parts / 50).
Parts, weight ratio) to 500 parts by using a rotary mixer to prepare a dispersion liquid of the component (b). The component (b) dispersion liquid was added to the above-prepared component (a) solution at a ratio shown in Table 1 over 60 minutes while stirring using an inversion mixer. The obtained mixed liquid was filtered with 80 mesh to obtain a composition of the present invention. The evaluation results are shown in Table 1.

[0048]

[Table 1]

[0049]

INDUSTRIAL APPLICABILITY The ink jet recording receiving composition of the present invention is excellent in coating workability, and the ink jet recording medium coated with the composition of the present invention has smoothness, water resistance and
It has excellent ink fixability and recorded image accuracy, and is very useful as an inkjet recording medium.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiaki Yonekawa             2-3-2 Nihonbashi, Chuo-ku, Tokyo Stocks             Company etech F-term (reference) 2H086 BA01 BA15 BA33 BA35 BA37                       BA45

Claims (3)

[Claims] 1. A water-based cationic resin (a) in an amount of 90 to 25 parts by weight in terms of solid content (and (b) a hydrophobic silica 10 to 7).
An ink jet recording receiving composition containing 5 parts by weight (however, (a) + (b) = 100 parts by weight). 2. The average particle size of the hydrophobic silica (b) in the receiving composition is 50 to 5,000 nm as measured by a dynamic light scattering method, and the hydrophobic silica is used for imparting hydrophobicity to the surface. The receiving composition for inkjet recording according to claim 1, which has been treated. 3. An ink jet recording medium having a layer comprising the ink jet recording receiving composition according to claim 1 or 2 on at least one side of a substrate.