JP2003276314A - Chemical for inkjet recording paper and inkjet recording paper using the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve water resistance and improve light resistance,
Provided are a chemical for ink jet recording paper that imparts coloring properties, and an ink jet recording paper using the same. (A) General formula (I) and / or general formula (II) (R ¹ and R ² are an alkyl group having 1 to 10 carbon atoms, 5 to 5 carbon atoms)
A cycloalkyl group or an aralkyl group having 7 to 10 carbon atoms, X ^a- is an anion, a is a valence of the anion), and (b) a structural unit derived from (meth) acrylamide. And the molar ratio of the structural unit (a) to the structural unit (b) is 95: 5 to 50:50.
And a drug for an ink jet recording paper containing a diallylamine-based cationic copolymer having a weight average molecular weight in the range of 2,000 to 15,000, and an ink jet recording paper using the drug.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a chemical agent for ink jet recording paper and an ink jet recording paper using the same. More specifically, the present invention is useful as a waterproofing agent for inkjet recording papers, etc., and is used as an agent for inkjet recording papers containing a low molecular weight diallylamine-based cationic copolymer, and improving the water resistance using the same. And an inkjet recording sheet.

[0002]

2. Description of the Related Art In recent years, due to the widespread use of computers, it has become common to print out materials created by computers using printers and the like. Examples of printers used at that time include dot impact printers, laser printers, thermal printers, inkjet printers, etc., but since there is almost no mechanical noise during printouts and the running costs associated with printouts are low, inkjet printers are used. Printers are often used. This ink jet printer is a type of printer that ejects ink in a jet shape to perform printing, and as the paper used therefor, plain paper and coated paper are often used.

However, when plain paper is used as the ink jet recording paper, when water adheres after recording,
Water proofing agents are generally used because problems such as dye bleeding occur. As the water-proofing agent, for example, dicyandiamine condensates, polyamines, and cationic resins such as polyethyleneimine have been proposed. However, in these cationic resins, insufficient water resistance, discoloration of color tone, white paper part There were problems such as yellowing and ink bleeding.

Further, an ink jet recording paper obtained by coating or impregnating a diallyldimethylammonium chloride-acrylamide copolymer as one of the cationic resins is disclosed (Japanese Patent Laid-Open No. 1-9776). However, this inkjet recording paper is excellent as an inkjet recording paper because the weight-average molecular weight of the diallyldimethylammonium chloride-acrylamide copolymer used for the inkjet recording paper is about 200,000, but it is more excellent in light resistance and color development. It was required to be good.

Therefore, various attempts have been made so far in order to solve these problems. For example, an inkjet recording paper having a cationic resin obtained by reacting a secondary amine with epihalohydrin on at least the surface of the recording paper has been proposed (JP-A-6-92012).
Issue). However, in this inkjet recording paper, although it is excellent in terms of water resistance, since the cationic resin used is a strong cationic, it strongly interacts with a dye having a carboxyl group or a sulfonic acid group as an auxiliary chromophore. However, it has a drawback that the discoloration of the ink is likely to occur.

[0006]

Under the above circumstances, the present invention improves the water resistance of an image or a character to be recorded by using it for an ink jet recording paper, and has good light resistance, An object of the present invention is to provide a chemical agent for inkjet recording paper, which imparts color developability and is less likely to cause discoloration of the ink, and an inkjet recording paper having the above-mentioned characteristics, which is obtained by using the chemical agent.

[0007]

The inventors of the present invention have conducted extensive studies to develop a chemical agent for ink jet recording paper having the above-mentioned excellent performance, and as a result, have found that a diallylamine type cationic copolymer having a specific composition and molecular weight is used. It has been found that the purpose of the invention can be achieved by a drug containing a combination, and the present invention has been completed based on this finding.

That is, the present invention provides (1) (a) general formula (I) and / or general formula (II)

[0009]

[Chemical 3] (In the formula, R ¹ and R ² each represent an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms, which may be the same or different. at best, X ^a- is an anion, a is the constitutional unit represented by indicating the valency of the anion.)
(B) General formula (III)

[0010]

[Chemical 4] (In the formula, R ³ represents a hydrogen atom or a methyl group.), And the molar ratio of the structural unit (a) to the structural unit (b) is 95: 5. At 50:50,
An agent for inkjet recording paper, comprising a diallylamine-based cationic copolymer having a weight average molecular weight in the range of 2,000 to 15,000,

(2) The chemical agent for ink jet recording paper according to item (1), which is used as a water resistant material, (3)
The chemical agent for inkjet recording paper according to the above (1) or (2), wherein the diallylamine-based cationic copolymer is obtained by a polymerization reaction in the presence of hypophosphite, and (4) a diallylamine-based agent. The cationic copolymer is
The above (1), (2) or (3) which is a copolymer of diallyldimethylammonium chloride and acrylamide.
Ink jet recording paper agent according to item,

(5) An ink jet recording paper characterized by using the chemical for ink jet recording paper according to any one of (1) to (4) above, and (6) a chemical for ink jet recording paper. The inkjet recording paper according to item (5), which is used for a coating layer, is provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The diallylamine-based cationic copolymer contained in the chemical composition for ink jet recording paper of the present invention comprises (a) the general formula (I) and / or the general formula (II).

[0014]

[Chemical 5] And a structural unit represented by the general formula (III)

[0015]

[Chemical 6] And a structural unit represented by.

In the above general formulas (I) and (II),
R ¹ and R ² are each an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms or 7 carbon atoms.
10 to 10 aralkyl groups are shown, which may be the same or different from each other. X a ⁻ represents an anion such as a halogen ion and a methylsulfate ion. a is the valence of the anion.

Here, the alkyl group having 1 to 10 carbon atoms is a lower alkyl group such as methyl group, ethyl group, n-propyl group and isopropyl group, and the cycloalkyl group having 5 to 10 carbon atoms is cyclohexyl. Base has 7 carbon atoms
Preferred examples of the aralkyl group of 10 to 10 include a benzyl group. In addition, R ³ in the general formula (III) is
Represents a hydrogen atom or a methyl group.

The diallylamine-based cationic copolymer has a molar ratio of the structural unit (a) to the structural unit (b) of 95: 5 to 50:50 and a weight average molecular weight of 2,000.
It should be in the range of 0 to 15,000. If the molar ratio of the structural unit (a) to the structural unit (b) exceeds the upper limit of the above range, the light resistance of the inkjet recording paper tends to deteriorate, while if it is less than the lower limit of the above range, the water resistance of the inkjet recording paper decreases. There is a risk.
The preferable molar ratio of the structural unit (a) to the structural unit (b) is in the range of 90:10 to 60:40.

If the weight average molecular weight is less than 2,000, it is difficult to manufacture, and the water resistance of the ink jet recording paper may be insufficient. The water resistance, light resistance, color development, etc. of the recording paper are likely to deteriorate.
A preferred weight average molecular weight is 3,000 to 10,000.
Is the range.

The weight average molecular weight is a value measured by gel permeation chromatography (GPC) using polyethylene glycol as a standard substance. Details of the measuring method will be described later.

The diallylamine-based cationic copolymer used in the chemical composition for ink jet recording paper of the present invention is
For example, in a water-based solvent, in the presence of a radical polymerization initiator and hypophosphite, the compound represented by the general formula (IV)

[0022]

[Chemical 7] (In the formula, R ¹ , R ² , X ^a-, and a have the same meanings as described above), and a diallyldialkylammonium salt represented by the general formula (V)

[0023]

[Chemical 8] (In the formula, R ³ has the same meaning as described above.) A (meth) acrylamide represented by the above can be copolymerized at a predetermined ratio to produce the compound.

Examples of the diallyldialkylammonium salt represented by the general formula (IV), which is one component of the raw material of the diallylamine-based cationic copolymer, include diallyldimethylammonium chloride, diallyldimethylammonium bromide, diallyl iodide. Dimethylammonium, diallyldimethylammonium methylsulfate, diallylmethylbenzylammonium chloride, diallylmethylbenzylammonium bromide, diallylmethylbenzylammonium iodide, diallylmethylbenzylammonium methylsulfate, diallyldibenzylammonium chloride, diallyldibenzylammonium bromide, iodo Diallyldibenzylammonium chloride, diallyldibenzylammonium methylsulfate, etc., and these may be used alone or in combination of two or more. It may be used in conjunction seen.

Examples of the aqueous solvent used in the above polymerization reaction include water, inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid and polyphosphoric acid or aqueous solutions thereof, organic acids such as formic acid, acetic acid, propionic acid and lactic acid, or the like. Examples thereof include aqueous solutions, alcohols, dimethylsulfoxide, dimethylformamide, and further aqueous solutions of inorganic acid salts such as zinc chloride, calcium chloride and magnesium chloride. These may be used alone or in combination of two or more.

Further, as the radical polymerization initiator,
There is no particular limitation, and an arbitrary one can be appropriately selected and used from known polymerization initiators conventionally used for polymerization of diallylamine-based cationic monomers. Preferred examples of such radical polymerization initiators include persulfate-based radical initiators and radical initiators having an azo group in the molecule. Examples of the persulfate-based radical initiator include ammonium persulfate, potassium persulfate, sodium persulfate, and the like. These may be used alone or in combination of two or more.

On the other hand, as the radical initiator having an azo group in the molecule, a compound having an azo group and a cationic nitrogen in the molecule is preferable. Examples of such compounds include 2,2'-azobis (2-amidinopropane),
2,2'-azobis (2-amidinobutane), 2,2 '
-Azobis (2-amidinopentane), 2,2'-azobis (2-amidino-3-methylbutane), 3,3'-
Azobis (3-amidinopentane), 3,3′-azobis (3-amidinohexane), 3,3′-azobis (3
-Amidino-4-methylpentane), 4,4'-azobis (4-amidinoheptane) and the like. Here, as the addition salt, for example, hydrochloride, sulfate,
Mention may be made of inorganic acid addition salts or organic acid addition salts such as phosphates, alkylsulfates, p-toluenesulfonates, formates, acetates, propionates and the like. These azo radical initiators may be used alone, or 2
You may use it in combination of 2 or more types.

Further, in this polymerization reaction, in order to suppress the degree of polymerization of the resulting diallylamine-based cationic copolymer and control the weight average molecular weight in the range of 2,000 to 15,000, hypophosphite is used. Is used. This hypophosphite has the general formula (VI)

[0029]

[Chemical 9] (In the formula, M represents an alkali metal, ammonium or amine.). As a concrete example,
Examples thereof include sodium salt, lithium salt, potassium salt, ammonium salt, amine salt and the like. It may also be a hydrate. These hypophosphites may be used alone or in combination of two or more.

The amount of radical polymerization initiator used in this polymerization reaction is usually selected in the range of 0.8 to 20% by weight, preferably 1.0 to 10% by weight, based on the total amount of the monomers. The amount of hypophosphite used is usually 1.0 to 30% by weight, preferably 1.5 to 20%, based on the total amount of the monomers.
It is selected within the range of weight%. Further, it is advantageous to use the hypophosphite in an amount of usually 20 to 400% by weight, preferably 60 to 300% by weight, based on the radical polymerization initiator.

The polymerization temperature will differ depending on the type of monomer used and the type of aqueous solvent, but is usually in the range of 50 ° C to reflux temperature, preferably 55 to 80 ° C. The polymerization time depends on the type of the monomer used, the polymerization temperature, the amount of the radical polymerization initiator, etc., and cannot be determined unconditionally, but usually 200 hours or less is sufficient. The concentration of the monomer is preferably as high as possible within the range of its solubility, but is usually 10% by weight or more, preferably 20 to 60% by weight.

After carrying out the polymerization reaction in this manner, the polymerization product in the reaction-terminated liquid is isolated and purified by a known method, for example, a precipitation method using methanol, acetone or the like, to obtain the desired diallylamine cation. A sex copolymer can be obtained.

The chemicals for ink jet recording paper of the present invention are
It contains the diallylamine-based cationic copolymer having the above-mentioned copolymerization ratio and weight average molecular weight obtained as described above, and can be suitably used as a waterproofing agent for inkjet recording paper.

This chemical may be contained in the base paper of the ink jet recording paper or may be used in the coating layer formed on the surface of the base paper, but it is particularly preferably used in the coating layer. When the agent is used in the coating layer, for example, the diallylamine-based cationic copolymer is dissolved in an aqueous medium, and if necessary, a water-soluble polymer compound having a surface size, an inorganic pigment, an organic pigment. , Pigment dispersant,
Thickener, antifoaming agent, ultraviolet absorber, antioxidant, preservative,
The coating liquid can be prepared by adding a polar organic solvent or the like.

Examples of the water-soluble polymer compound include oxidized starch, cationized starch or various modified starches, polyethylene oxide, polyacrylamide, sodium polyacrylate, hydroxymethyl cellulose, polyvinyl alcohol and the like. Examples of the inorganic pigment include light calcium carbonate, heavy calcium carbonate, kaolin (white clay), talc, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zinc sulfate, zinc carbonate, satin white, aluminum silicate, diatomaceous earth,
Examples thereof include calcium silicate, synthetic silica, aluminum hydroxide and alumina. As an organic pigment,
Examples thereof include styrene plastic pigments, acrylic plastic pigments, urea resin pigments and the like.

As a method for coating the base paper, for example, a size press, a gate roll coater, a blade metalling size press, a rod coater, an air knife coater,
Various coating methods such as a curtain coater can be used. The coating amount of the diallylamine-based cationic copolymer is usually selected in the range of 0.1 to 10.0 g / m ² , preferably 0.2 to 5.0 g / m ² . In this way, the ink jet recording paper of the present invention thus obtained has excellent water resistance, light resistance and color development.

[0037]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. The weight average molecular weight and the polymerization yield of the polymers in Comparative Production Examples and Production Examples were measured according to the following methods. <Measurement of Polymer Weight-Average Molecular Weight and Polymerization Yield> Hitachi L-6
GPC using 000 type high performance liquid chromatography
It was measured by the method. Eluent channel pump is Hitachi L-60
00, the detector is a Shoredex RI SE-61 differential refractive index detector, and the column is Asahi Pack's aqueous gel filtration type GS-220HQ (exclusion limit molecular weight 3,000) and GS-620HQ (exclusion limit molecular weight 2,000,000). A double connection was used. Sample is the eluent 0.5
The concentration was adjusted to g / 100 ml and 20 μl was used. A 0.4 mol / liter sodium chloride aqueous solution was used as an eluent. Column temperature is 30 ℃, flow rate is 1.0ml
/ Min. Molecular weight 106, 4 as standard sample
40, 1470, 4100, 7100, 12600, 3
A calibration curve was determined using 10 kinds of polyethylene glycols of 2500, 74900, 205000, and 460000, and the weight average molecular weight of the polymer was determined based on the calibration curve. Further, the polymerization yield was calculated from the peak area of each component in the chromatogram.

Comparative Production Example 1 Production of P (DADMAC) In a four-necked flask equipped with a thermometer, a stir bar and a reflux condenser, 323.4 g (1.2 moles) of a 60 wt% diallyldimethylammonium chloride (DADMAC) aqueous solution. )
Was charged. Next, the internal temperature was raised to 60 ° C., and 1.4 g of a 28.5 wt% ammonium persulfate aqueous solution was added. Then, while maintaining the internal temperature at 65 to 70 ° C., another 2.0 g was added after 4 hours. After 24, 28, and 48 hours, the same amount was added, and then the mixture was kept at 65 ° C for 20 hours,
The polymerization was completed. After completion of the polymerization, the obtained polymer aqueous solution was analyzed by the GPC method to find that the weight average molecular weight (M
w) was 100,000 and the polymerization yield was 95%.

Comparative Production Example 2 Production of P (DADMAC) In the same apparatus used in Comparative Production Example 1, 161.7 g of a 60 wt% diallyldimethylammonium chloride aqueous solution was added.
(0.6 mol) and 162 g of distilled water were charged, and the pH was adjusted to 3 to 4 with hydrochloric acid. Next, sodium hypophosphite 3.
9 g was added and dissolved by stirring at 50 ° C. Then set the internal temperature to 60
The temperature was raised to 0 ° C., and 1.7 g of a 28.5 wt% ammonium persulfate aqueous solution was added. Then, while keeping the internal temperature at 60 to 65 ° C., 3.4 g was further added after 4 hours, and the same amount was added after 8 hours. Then, the temperature was kept at 60 ° C. for 20 hours to complete the polymerization. After completion of the polymerization, the obtained polymer aqueous solution was analyzed by GPC method. As a result, the weight average molecular weight (Mw) was 3,000 and the polymerization yield was 95%.

Comparative Production Example 3 P (DADMAC-AA
Preparation of m) In the same apparatus used in Comparative Preparation Example 1, 215.6 g of a 60 wt% diallyldimethylammonium chloride aqueous solution was added.
(0.8 mol) and 167 g of distilled water were charged, and the pH was adjusted to 3 to 4 with hydrochloric acid. Next, acrylamide (AAm)
7.3 g (0.1 mol) was added and dissolved at 50 ° C. with stirring. Next, the internal temperature was raised to 60 ° C., and 1.0 g of a 28.5 wt% ammonium persulfate aqueous solution was added. Then, while maintaining the internal temperature at 60 to 65 ° C., 1.4 g was further added after 4 hours. After 24, 28, and 48 hours, the same amount was added, and then the mixture was kept at 65 ° C. for 20 hours to complete the polymerization. After completion of the polymerization, the obtained aqueous copolymer solution was subjected to GPC.
When analyzed by the method, the weight average molecular weight (Mw) was 1
The polymerization yield was 50,000 and the polymerization yield was 94%.

Comparative Production Example 4 P (DADMAC-AA
Preparation of m) In the same apparatus used in Comparative Preparation Example 1, 269.5 g of a 60 wt% aqueous solution of diallyldimethylammonium chloride was used.
(1.0 mol) was charged and the pH was adjusted to 3 to 4 with hydrochloric acid. Next, 18.3 g (0.25 mol) of acrylamide and 0.9 g of sodium hypophosphite were added and dissolved with stirring at 50 ° C. Next, the internal temperature was raised to 60 ° C. and increased to 28.5.
3.1 g of a weight% aqueous solution of ammonium persulfate was added.
Then, while maintaining the internal temperature at 60 to 65 ° C, after 4 hours, 6.3 g was further added. Then incubate at 60 ℃ for 20 hours,
The polymerization was completed. After the completion of the polymerization, the obtained copolymer aqueous solution was analyzed by the GPC method. As a result, the weight average molecular weight (Mw) was 20,000 and the polymerization yield was 98%.

Comparative Production Example 5 P (DADMAC-AA
Preparation of m) In the same apparatus as used in Comparative Preparation Example 1, 94.3 g of a 60% by weight diallyldimethylammonium chloride aqueous solution was added.
(0.35 mol) and 209 g of distilled water were charged, and the pH was adjusted to 3 to 4 with hydrochloric acid. Next, acrylamide 51.3
g (0.7 mol) and sodium hypophosphite 5.3 g
Was added and dissolved by stirring at 50 ° C. Next, the internal temperature was raised to 60 ° C., and 1.9 g of a 28.5 wt% ammonium persulfate aqueous solution was added. Then, while keeping the internal temperature at 60 to 65 ° C., 3.7 g was further added after 4 hours. Then 65
The temperature was kept at 20 ° C. for 20 hours to complete the polymerization. After completion of polymerization
When the obtained copolymer aqueous solution was analyzed by GPC method, the weight average molecular weight (Mw) was 4,000 and the polymerization yield was 97%.

Production Example 1 Production of P (DADMAC-AAm) In a four-necked flask equipped with a thermometer, a stir bar and a reflux condenser, 134.7 g (0.5 mol) of a 60% by weight diallyldimethylammonium chloride aqueous solution and Distilled water 17
6 g was charged and the pH was adjusted to 3 to 4 with hydrochloric acid. Next, 18.3 g (0.25 mol) of acrylamide and 3.9 g of sodium hypophosphite were added and dissolved by stirring at 50 ° C. Next, the internal temperature was raised to 60 ° C., and 1.7 g of a 28.5 wt% ammonium persulfate aqueous solution was added. Then, while keeping the internal temperature at 60 to 65 ° C, 3.5 g was further added after 4 hours. Then, the temperature was kept at 60 ° C. for 20 hours to complete the polymerization. After completion of the polymerization, the obtained aqueous copolymer solution was subjected to GPC.
When analyzed by the method, the weight average molecular weight (Mw) was 3,000 and the polymerization yield was 96%.

Production Example 2 Production of P (DADMAC-AAm) 188.6 g of a 60% by weight diallyldimethylammonium chloride aqueous solution was placed in the same apparatus as used in Production Example 1.
(0.7 mol) and 131 g of distilled water were charged, and the pH was adjusted to 3 to 4 with hydrochloric acid. Next, 25.6 g of acrylamide
(0.35 mol) and sodium hypophosphite 4.1 g
Was added and dissolved by stirring at 50 ° C. Next, the internal temperature was raised to 60 ° C., and 2.4 g of a 28.5 wt% ammonium persulfate aqueous solution was added. Then, while maintaining the internal temperature at 60 to 65 ° C., 4.8 g was further added after 4 hours. Then 60
The temperature was kept at 20 ° C. for 20 hours to complete the polymerization. After completion of polymerization
When the obtained copolymer aqueous solution was analyzed by GPC method, the weight average molecular weight (Mw) was 5,000 and the polymerization yield was 97%.

Production Example 3 Production of P (DADMAC-AAm) In the same apparatus as used in Production Example 1, 242.5 g (0.1%) of a 60 wt% diallyldimethylammonium chloride aqueous solution was added.
9 mol) and 176 g of distilled water were charged, and the pH was adjusted to 3 with hydrochloric acid.
Adjusted to ~ 4. Next, 33.0 g of acrylamide (0.
45 mol) and 1.8 g of sodium hypophosphite were added, and dissolved by stirring at 50 ° C. Next, the internal temperature was raised to 60 ° C., and a 28.5 wt% ammonium persulfate aqueous solution 3.1 was added.
g was added. Then, while maintaining the internal temperature at 60 to 65 ° C, after 4 hours, 6.2 g was further added. Then, the temperature was kept at 60 ° C. for 20 hours to complete the polymerization. After completion of the polymerization, the obtained copolymer aqueous solution was analyzed by GPC method.
Weight average molecular weight (Mw) 10,000, polymerization yield 9
It was 8%.

Production Example 4 Production of P (DADMAC-AAm) In the same apparatus as used in Production Example 1, 215.6 g (0.1%) of a 60 wt% diallyldimethylammonium chloride aqueous solution was added.
(8 mol) and distilled water (215 g) were added, and the pH was adjusted to 3 with hydrochloric acid.
Adjusted to ~ 4. Next, 14.7 g (0.
2 mol) and 4.3 g of sodium hypophosphite are added,
It was dissolved by stirring at 50 ° C. Next, the internal temperature was raised to 60 ° C., and 2.5 g of a 28.5 wt% ammonium persulfate aqueous solution was added.
Was added. And while keeping the internal temperature at 60-65 ° C,
After 4 hours, another 5.0 g was added. Then 20 at 60 ℃
The temperature was kept warm to complete the polymerization. After completion of the polymerization, the obtained copolymer aqueous solution was analyzed by the GPC method. As a result, the weight average molecular weight (Mw) was 5,000 and the polymerization yield was 98%.

Production Example 5 Production of P (DADMAC-AAm) 215.6 g of a 60% by weight diallyldimethylammonium chloride aqueous solution was placed in the same apparatus as used in Production Example 1.
(0.8 mol) and 118 g of distilled water were charged, and the pH was adjusted to 3 to 4 with hydrochloric acid. Next, 7.3 g of acrylamide
(0.1 mol) and 4.0 g of sodium hypophosphite were added, and dissolved by stirring at 50 ° C. Next, the internal temperature was raised to 60 ° C., and a 28.5% by weight aqueous ammonium persulfate solution 2.
4 g was added. Then, while maintaining the internal temperature at 60 to 65 ° C., 9.6 g was further added after 4 hours. Then, the temperature was kept at 60 ° C. for 20 hours to complete the polymerization. After completion of the polymerization, the obtained copolymer aqueous solution was analyzed by GPC method.
Weight average molecular weight (Mw) is 5,000 and polymerization yield is 97.
%Met.

Comparative Example 1 Preparation of Inkjet Recording Paper 22.5 parts by weight of synthetic amorphous silica (trade name: Fineseal X-37B, manufactured by Tokuyama Corp.) as an inorganic pigment, polyvinyl alcohol (trade name: as a binder)
PVA-117S, manufactured by Kuraray Co., Ltd.) 4.5 parts by weight,
As a fixing agent, P (DADMA obtained in Comparative Production Example 1)
C) 3 parts by weight (on a solid basis) were uniformly mixed to prepare an ink receiving layer coating liquid having a silica concentration of 15% by weight. The prepared coating liquid was applied onto plain paper and dried to prepare an inkjet recording paper. The amount of P (DADMAC) in the coating layer was 2.0 g / m ² .

Comparative Example 2 Preparation of Inkjet Recording Paper The procedure of Comparative Example 1 was repeated except that the P (DADMAC) obtained in Comparative Production Example 2 was used instead of the P (DADMAC) used in Comparative Example 1. An inkjet recording paper was prepared.

Comparative Example 3 Preparation of Inkjet Recording Paper Same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Comparative Production Example 3 was used in place of P (DADMAC) used in Comparative Example 1. Thus, an inkjet recording paper was produced.

Comparative Example 4 Preparation of Inkjet Recording Paper The same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Comparative Production Example 4 was used in place of P (DADMAC) used in Comparative Example 1. Thus, an inkjet recording paper was produced.

Comparative Example 5 Preparation of Inkjet Recording Paper The same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Comparative Production Example 5 was used in place of P (DADMAC) used in Comparative Example 1. Thus, an inkjet recording paper was produced.

Example 1 Preparation of Inkjet Recording Paper The same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Production Example 1 was used in place of P (DADMAC) used in Comparative Example 1. Inkjet recording paper was prepared.

Example 2 Preparation of Inkjet Recording Paper The same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Production Example 2 was used instead of P (DADMAC) used in Comparative Example 1. Inkjet recording paper was prepared.

Example 3 Preparation of Inkjet Recording Paper The same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Production Example 3 was used in place of P (DADMAC) used in Comparative Example 1. Inkjet recording paper was prepared.

Example 4 Preparation of Inkjet Recording Paper The same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Production Example 4 was used in place of P (DADMAC) used in Comparative Example 1. Inkjet recording paper was prepared.

Example 5 Preparation of Inkjet Recording Paper The same as Comparative Example 1 except that P (DADMAC-AAm) obtained in Production Example 5 was used in place of P (DADMAC) used in Comparative Example 1. Inkjet recording paper was prepared.

With respect to the ink jet recording papers obtained in Comparative Examples 1 to 5 and Examples 1 to 5, light resistance, water resistance, ink bleeding property and color forming property were evaluated by the following methods. For the water resistance, a test paper coated only with the target polymer was separately prepared and subjected to the test. The results are shown in Tables 1 and 2.

(1) Lightfast inkjet printer (trade name: BJ F610,
Using Canon), square-shaped figures with a side length of 1 cm were solidly printed with magenta on the test papers produced in Comparative Examples and Examples, and a xenon fade meter (trade name: Xenon Fade Meter X25F, Suga Test) was used. Light resistance test was performed using a machine. A colorimeter before and after the test was measured using a colorimeter (trade name: Colorimeter CR321, manufactured by Minolta Co., Ltd.), and the light resistance was evaluated according to the following criteria.

[0060] ◎: No fading is observed ○: Almost no fading △: Some fading is seen ×: Fading is seen

(2) A test paper was prepared by dissolving a polymer to be tested in water-resistant distilled water, immersing plain paper in the polymer solution, and then drying it. Next, using an ink jet printer, the ruled lines were printed with magenta on this test paper as well as light resistance, one drop of distilled water was dropped, and bleeding was visually observed after standing and drying. Water resistance was evaluated according to the following criteria. did.

[0062] ⊚: No bleeding is seen ○: Almost no bleeding △: Some bleeding is seen ×: Bleeding is seen

(3) Using an ink jet printer as in the ink bleeding and light resistance test,
The test papers produced in Comparative Examples and Examples have a side length of 1
A square cm figure was solidly printed with magenta, and white characters were added during solid printing. An ink bleeding test was conducted using a thermo-hygrostat (trade name: thermo-hygrostat LH-113, manufactured by Tabai Espec Co., Ltd.). After the test, the colored letters were visually observed, and the ink bleeding property was evaluated according to the following criteria.

[0064] ⊚: No bleeding is seen ○: A very small amount of bleeding is seen △: Bleeding is clearly visible ×: Characters are blurred so that they cannot be distinguished

(4) Using an ink jet printer in the same manner as in the color development and light resistance test,
The test papers produced in Comparative Examples and Examples have a side length of 1
A square figure of cm was solidly printed with magenta, and the color was measured using a colorimeter, and the color development was evaluated according to the following criteria.

[0066] ⊚: Very excellent in color development ○: Excellent color development Δ: Not very excellent in color development ×: Not excellent in color development

[0067]

[Table 1]

[0068]

[Table 2]

[0069]

INDUSTRIAL APPLICABILITY According to the present invention, an agent for ink jet recording paper, which improves water resistance of recorded images and characters, imparts good light resistance and color development, and is resistant to discoloration of ink. It is possible to provide an ink jet recording sheet having the above-mentioned characteristics, which is obtained by using the above chemicals.

Claims (6)

[Claims] 1. (a) General formula (I) and / or general formula (II): (In the formula, R ¹ and R ² each represent an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms, which may be the same or different. at best, X ^a- is an anion, a is the constitutional unit represented by indicating the valency of the anion.)
(B) General formula (III): (In the formula, R ³ represents a hydrogen atom or a methyl group.), And the molar ratio of the structural unit (a) to the structural unit (b) is 95: 5. At 50:50,
An agent for inkjet recording paper, comprising a diallylamine-based cationic copolymer having a weight average molecular weight in the range of 2,000 to 15,000. 2. The chemical for ink jet recording paper according to claim 1, which is used as a waterproofing agent. 3. The chemical agent for inkjet recording paper according to claim 1, wherein the diallylamine-based cationic copolymer is obtained by a polymerization reaction in the presence of hypophosphite. 4. The chemical agent for ink jet recording paper according to claim 1, 2 or 3, wherein the diallylamine-based cationic copolymer is a copolymer of diallyldimethylammonium chloride and acrylamide. 5. An ink jet recording paper, characterized by using the chemical for ink jet recording paper according to any one of claims 1 to 4. 6. The ink jet recording paper according to claim 5, wherein a chemical for ink jet recording paper is used in the coating layer.