JP2003064597A - Water-based surface coating agent for printing paper, method for producing the same and printing paper coated therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface-coating agent hardly causing feathering and strike through, and imparting excellent surface properties such as resolution and density of color, when applied to an inkjet printing paper, and capable of imparting good paper-feeding properties and traveling properties when applied to a transfer paper for electrophotography, and further to provide a method for producing the surface-coating agent, and a printing paper obtained by attaching the surface-coating agent on a paper substrate and drying the resultant paper. SOLUTION: This water-based surface coating agent for the printing contains (A) an amino group-containing polysiloxane, (B) an acrylic resin and (C) water. The method for producing the surface-coating agent, and the printing paper obtained by coating the surface-coating agent on the paper substrate and drying the resultant paper are also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based printing paper surface coating agent, a method for producing the same, and a printing paper coated with the same. More specifically, when used as an ink jet recording paper, bleeding and back It does not come off, it can give excellent surface properties such as resolution, color strength, less stickiness, and less change in the appearance of paper, and it is good when used for electrophotographic transfer paper. TECHNICAL FIELD The present invention relates to a water-based printing paper surface coating agent capable of imparting excellent paper feeding property and running property, a method for producing the same, and a printing paper coated with the same.

[0002]

2. Description of the Related Art In addition to traditional techniques such as flat plate printing using ordinary ink, letterpress printing, flexo ink printing, gravure printing, etc., in recent years, printing techniques such as inkjet printing and electrophotography have been used for printing on a small number of sheets. Printing and thermal transfer printing have become mainstream. Inkjet printing is a method of drawing an image on paper by ejecting ink droplets from a nozzle, and because the device is reasonably priced, it is widely used as an output printer for personal computers, and electrophotographic printing uses selenium. , Amorphous silicone, zinc oxide, OP
This is a method in which light is applied to an electrophotographic photosensitive drum such as C (organic semiconductor) to eliminate the charge on that portion, and then toner charged with the opposite sign is attached to form an image, which is transferred onto paper and heat-fixed. , Is often used as an office printer or copier, and thermal transfer printing is a method in which a thermal ribbon sheet with an ink layer such as wax is heated from the back side with a thermal head and fixed on paper. It is used in register and ticket vending machines.

In the case of ink jet printing, the ink used is safe because it does not cause clogging of nozzles for ejecting ink dots toward printing paper even if it is stored for a long period of time, and has no flammability, flammability and toxicity. The water-based ink containing water as a main component and a polyhydric alcohol or the like added as a nozzle clogging preventive agent and a discharge characteristic improving agent is mainly used because of its excellent recording characteristics. ing.

Therefore, the printing paper used in ink jet printing has various requirements such as high absorbency of ink, high absorption capacity, high density printing and high quality printing without ink bleeding. Must meet the following requirements, and can be used as a support for plain paper, coated paper (art paper,
Coated paper, cast coated paper, etc.), plastic film, synthetic paper, RC paper (paper coated on both sides with resin)
Is a paper having a special coating layer on its surface, or is a general high-quality paper type paper. As a special coating layer for paper with a coating layer, a non-void type that mainly uses a surfactant or hydrophilic polymer, and a void type in which fine particle silica is bound with a binder resin (called the coated paper type). There are some cases.)

As the non-void type, for example, tetraalkylammonium salts such as cetyltrimethylammonium bromide (JP-A-56-99693), 2
-Quaternary ammonium hydroxide salts such as hydroxyethylammonium hydroxide (JP-A-59-198187), quaternary ammonium salts of polyoxyalkylenated amine monocarboxylic acid esters (JP-A-61-284747).
No. 8), a combination of a cationic surfactant and a cationic polymer (JP-A-63-162275), a surface coating agent containing an alkali metal salt or a phosphate as a main component (JP-A-62-62). No. 156985, JP-A-4-331182
Anti-slip agent comprising a rosin ester emulsion and a water-soluble binder (JP-A-9-1161).
No. 0), a surface coating agent containing a cationic surfactant (JP-A-10-6641), and the like.

However, in recent years, as the printing speed and the printing density have been further increased, none of them sufficiently satisfy the requirements for less bleeding, strike-through, and color density. Also, this type of coating agent has a sticky paper surface,
There were some problems with changes in appearance.

As the void type, for example, synthetic silica and a saponified petroleum sizing agent (Japanese Patent Laid-Open No. 57-157).
786), synthetic silica and dicyandiamide formalin condensate (JP-A-59-146889), fine powder silica and polyvinyl alcohol copolymer having silanol groups (JP-A-62-268682), and synthetic silica. A polymer having an alkyl (meth) acrylate quaternary ammonium salt and / or a (meth) acrylamidoalkyl quaternary ammonium salt as a skeleton (Japanese Patent Laid-Open No. 63-11578).
No. 0), a pigment containing fine particle silica, a zwitterionic latex (JP-A-6-227114), and a colorant receiving layer containing silica particles, and then a silane coupling agent having a quaternary ammonium salt structure. To form a recording layer by coating and drying (Japanese Patent Application Laid-Open No. 8-34160)
Have been proposed.

However, the void type ink jet recording paper has a coating layer containing silica as a main component on its surface and absorbs the ink into the voids, so that the ink absorbability is excellent and the water resistance, Although it has an advantage of being excellent in drying property, it has problems such as high cost and a slight inferior gloss due to the presence of voids.

On the other hand, in the case of electrophotographic printing, the printing papers used include toner transferability and fixing ability, paper feeding characteristics,
It is necessary to have excellent running properties and curl prevention properties. For example, paper is filled with calcium carbonate that has a positive charge due to frictional charging with the toner or carrier, and alkenyl succinic anhydride is used as a sizing agent. A neutral paper (Japanese Examined Patent Publication No. 63-40312) and a base paper having a coating layer containing a pigment and a copolymer latex having a minimum film-forming temperature of 20 to 40 ° C. as a main component, and a roll of 100 ° C. or more. A neutral paper prepared by passing the paper through a calender having a surface temperature to a water content of 4 to 6% by weight (Japanese Patent Laid-Open No. 08-328289),
Neutral paper containing a filler containing kaolin as a main component and talc in combination, a neutral rosin-based sizing agent, and a size-fixing agent. 08-328289
No. gazette) is proposed.

However, the fixing of the toner is mainly performed by a heat roll, and the size of the copolymer latex used in the coating layer adheres to the heat roll, resulting in uneven transferability of the toner. However, there are problems that a clear image is not provided, the transfer paper adheres to the heat roll, and the transfer paper is wrapped around, causing paper jam.

With the spread of electrophotographic copying machines in society, the role of electrophotographic transfer paper as a general printing paper is expanding, and it is used for both ink jet recording paper and electrophotographic transfer paper. The development of printing paper that can be used is demanded by paper manufacturers and paper users. From the paper manufacturing company side, it is more advantageous than high-mix low-volume production in small-item high-volume production in terms of quality control and costs in manufacturing, storage, distribution, and sales.
If there are many types of paper that are similar in appearance, inventory management will be laborious, and it will be difficult to check which paper is the wrong paper when setting it in an inkjet copier or electrophotographic copier. However, there is a problem that it takes a long time to replace it or causes a failure of the copying machine, resulting in a loss of time and cost.

At this time, when the above-mentioned void type (coated paper type) ink jet recording paper is used as a transfer paper for electrophotography, a coating layer containing silica as a main component is coated on the surface, so that the cost is reduced. In addition, the coating layer was not suitable for electrophotography because the coating layer damages the photosensitive drum, paper feedability and running performance. On the other hand, when a conventional electrophotographic transfer paper is used as an inkjet recording paper,
The ink did not have sufficient performance as an inkjet recording paper due to bleeding, strike-through, and poor color development.

In order to deal with the above problems, a printing paper which can be used as an ink jet recording paper or an electrophotographic transfer paper has been developed in recent years. As such a printing paper, for example, a neutralizing agent as an internal sizing agent is used. Contains rosin sizing agent, ratio of size press liquid to sheet basis weight (absorption coefficient) is 0.47 or more, and cup size degree is 13 ± 2
g / m ² , preferably the size press liquid has a molecular weight of 2
A transfer sheet mainly composed of an aqueous solution of polyacrylamide-based resin of 0.003 to 300,000 and containing an alkaline salt (Japanese Patent Application Laid-Open No. 06-99655), a neutral paper containing a balp fiber, a filler and an internal sizing agent. , A recording paper coated with a surface sizing agent containing an emulsion of an acrylonitrile-acrylic acid ester copolymer as a main component (Japanese Patent Laid-Open No. 08-50366), and a base paper mainly containing a silicate filler. A recording paper having a recording layer containing amorphous silica and a water-based binder as a main component in a solid content of 0.5 to 3.0 g / m ² on at least one surface, the recording layer surface Has a critical surface tension (γc) of 32 ≦ γ
Recording paper with c ≦ 42 dynes / cm (Japanese Patent Application Laid-Open No. 08-2
No. 69893), a mixture obtained by mixing a styrene acrylic resin, a dicyandiamide formalin polycondensate formulation and polyvinylpyrrolidone, a polydimethyldimethylmethylene piperidinium solution, and a coating solution containing a cationic or anionic surface sizing agent as a main component. A recording paper obtained by coating or impregnating a support (JP-A-10-168788),
A transfer paper prepared using a papermaking pulp slurry having a papermaking pH of 7.0 or more containing at least a filler, a neutral rosin sizing agent and a sulfuric acid band, wherein the content of the neutral rosin sizing agent in the transfer paper is 0.15 to 0.45% by weight, the content of acid-soluble aluminum salt is 0.40 to 1.50% by weight
A transfer paper (Japanese Patent Laid-Open No. 11-65157) is proposed.

However, among the printing papers which can be used as both the ink jet recording paper and the electrophotographic transfer paper, those containing a filler may damage the photosensitive drum, while those containing a sizing agent may be used. It is difficult to adjust the surface friction coefficient of the paper, and it may be difficult to balance the paper feeding property and the running property of the paper. Therefore, a solution is desired.

[0015]

In view of the above problems, the present invention has no bleeding or strike-through when used as an ink jet recording paper, and has resolution, color strength, low stickiness, and paper quality. A water-based printing paper surface that can impart excellent surface physical properties such as little change in appearance, and can impart good paper feeding and running properties when used for electrophotographic transfer paper. An object of the present invention is to provide a coating agent, a method for producing the same, and a printing paper obtained by coating the same.

[0016]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have prepared an aqueous composition containing an amino group-containing polysiloxane and an acrylic resin, and printed it. When used as a paper surface coating agent, they have found that the above problems can be solved, and have completed the present invention.

That is, according to the first aspect of the present invention,
Provided is a water-based printing paper surface coating agent comprising an amino group-containing polysiloxane (A), an acrylic resin (B) and water (C).

According to the second aspect of the present invention, the first aspect
In the invention, the amino group-containing polysiloxane (A)
Is provided by the following general formula (1), and a water-based printing paper surface coating agent is provided.

[Chemical 2] (In the formula, R ¹ is an alkyl group or an aryl group having 1 to 8 carbon atoms, and X is — (CH ₂ ) a (NH— (CH ₂ )).
₂ ) bNH ₂ is a group represented by Y is X or —CH _3.
Is a group represented by, m is a positive number from 0 to 800, and n is 0 to
A positive number of 150, a is an integer of 2 to 6, and b is 0 or 1. However, when n = 0, one or more Y is-(C
H ₂₎ is a group represented by _{a (NH- (CH 2) 2} ) bNH 2. )

Furthermore, according to the third invention of the present invention, in the second invention, the amino group-containing polysiloxane (A) is used.
Amine content in (-NH ₂ equivalent), 0.5-3.0
There is provided a water-based printing paper surface coating agent, which is characterized in that it is contained by mass%.

According to a fourth aspect of the present invention, the first aspect
In the invention, the acid value of the acrylic resin (B) is 0 to
There is provided a water-based printing paper surface coating agent, which is 50 mgKOH / g.

Further, according to a fifth invention of the present invention, in the first invention, the amino group-containing polysiloxane (A) is used.
And the content ratio of the acrylic resin (B) are 1.
There is provided a water-based printing paper surface coating agent, which is characterized in that it is 0/200 to 1.0 / 1.0.

According to a sixth aspect of the present invention, the first aspect
The invention further provides an aqueous printing paper surface coating agent characterized by containing an amine-based organic compound (D).

According to the seventh aspect of the present invention, the sixth aspect
In the invention, the content of the amine-based organic compound (D) is 0.1 to 50 with respect to a total of 100 parts by mass of the amino group-containing polysiloxane (A) and the acrylic resin (B).
There is provided a water-based printing paper surface coating agent, which is characterized by being parts by mass.

According to an eighth aspect of the present invention, the first aspect
In the invention described above, the total content of the other components blended in addition to the above (A) to (C) is 50 parts by mass with respect to 100 parts by mass of the total of the amino group-containing polysiloxane (A) and the acrylic resin (B). A water-based printing paper surface coating agent is provided, which is characterized by being no more than 1 part.

According to a ninth aspect of the present invention, the first aspect
In any of the inventions 1 to 8, first, a first aqueous composition containing an amino group-containing polysiloxane (A) and a second aqueous composition containing an acrylic resin (B) are separately prepared. Then, there is provided a method for producing a water-based printing paper surface coating agent, which comprises mixing the first water-based composition and the second water-based composition.

According to the tenth aspect of the present invention,
A printing paper comprising the water-based printing paper surface coating agent according to any one of the first to eighth inventions, which is applied to at least one surface of a paper substrate and then dried.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a water-based printing paper surface coating agent of the present invention, a method for producing the same, a printing paper, etc. will be described.
Each item will be described in detail.

1. Amino group-containing polysiloxane (A) Amino group-containing polysiloxane (A) used in the present invention
Is a polysiloxane compound having an amino group in the molecule, and is specifically represented by the following general formula (1).

[0029]

[Chemical 3]

R¹Preferred are those having 1 to 8 carbon atoms.
Is an alkyl group or an aryl group of
A tyl group and a phenyl group are preferable, and a methyl group is most preferable.
It is a chill group. X is-(CH_Two) A (NH- (CH_Two)
_Two) BNH_TwoA group represented by and preferred X is
Is-(CH_Two)_ThreeNH (CH_Two)_TwoNH_Two, And −
(CH_Two) _ThreeNH_TwoEtc. Y is X or -CH
_ThreeIs a group represented by, m is a positive number from 0 to 800, and n is 0
A positive number of ~ 150, a is an integer of 2 to 6, b is 0 or 1
is there. However, when n = 0, one or more Y is-(CH
_Two) A (NH- (CH_Two)_Two) BNH_TwoIn the group represented by
is there.

The preferred range of m is 20 to 200,
The preferable range of n is 0.2 to 30. When the amine content (-NH2 conversion) in the amino group-containing polysiloxane (A) is 0.5 to 3.0% by weight, the solubility of the acrylic resin and the amino group-containing polysiloxane (A) is improved, It is preferable because the coated film has no stickiness. Particularly preferably, it is 0.5 to 2.0% by weight.

The amino group-containing polysiloxane (A) is a known compound, for example, an alkaline catalyst of a hydrolysis condensation product of N-β- (aminoethyl) -γ aminopropylmethyldimethoxysilane and dimethylpolysiloxane. Can be obtained by the equilibration reaction with FZ-3
705, FZ-3710 (manufactured by Nippon Unicar Co., Ltd.),
Commercially available products such as KF-857, KF-858 (manufactured by Shin-Etsu Chemical Co., Ltd.), SF-8417, BY16-828 (manufactured by Toray Dow Corning Silicone Co., Ltd.) can be used. Further, FZ-4616, FZ-4645 (manufactured by Nippon Unicar Co., Ltd.), Polon MF-14 (manufactured by Shin-Etsu Chemical Co., Ltd.) and TEX-150, which are commercially available as an emulsion of amino group-containing polysiloxane (A). (Manufactured by GE Toshiba Silicone Co., Ltd.) and the like can also be used.

2. Acrylic Resin (B) In the present invention, the acrylic resin (B) is a copolymer containing acrylic acid, acrylic acid ester, methacrylic acid, and methacrylic acid ester, and specifically, is represented by the following general formula (2). It is a resin containing the components shown.

[0034]

[Chemical 4]

In the formula, R ² is a hydrogen atom or a carbon atom of 1
To 24 alkyl groups, R ³ is a hydrogen atom or a methyl group, and has a molecular weight in the range of 5,000 to 200,000, and the value of n corresponding thereto is R ² or R ^2.
3 is 50 to 2,000 as a methyl group.

Specific examples of the acrylic resin (B) include, for example, styrene / acrylic acid / acrylic acid ester copolymer, styrene / methacrylic acid ester copolymer, acrylic acid / acrylonitrile copolymer, vinylidene chloride.・ Methacrylic acid / methacrylic acid ester copolymer, vinylidene fluoride / methacrylic acid / methacrylic acid ester copolymer, allyl acid / acrylic acid ester / vinyl ester copolymer, acrylic acid / vinyl alcohol copolymer, methacrylic acid / Methacrylic acid ester / methacrylic acid amide copolymer, acrylic acid / acrylic acid amide copolymer, methacrylic acid / methacrylic acid ester / maleic anhydride copolymer, methacrylic acid / N vinylpyrrolidone copolymer, and vinyl fluoride / Acrylic acid / acrylic acid amide copolymer, etc. And the like. The acrylic resin is a known compound. Particularly, in the present invention, an acrylic resin emulsion obtained by an emulsion polymerization method can be preferably used. As the acrylic resin emulsion, those commercially available as Polytron series manufactured by Asahi Kasei Kogyo Co., Ltd. and SK Dyne series manufactured by Soken Kagaku Co., Ltd. can be preferably used. Acrylic resin has an acid value of 0 to 50 mgK
When it is OH / g, the solubility of the acrylic resin and the aminosilicone is improved, and the stickiness of the coating film is eliminated, which is preferable.

3. Water (C) In the present invention, water (C) is a solvent for emulsifying and / or dissolving the amino group-containing polysiloxane (A) and the acrylic resin (B). The amount of water (C) used is not particularly limited, but the total amount of the amino group-containing polysiloxane (A) and the acrylic resin (B) is 100 parts by weight, and 100 to 1500 parts by weight are used. When a stock solution of the water-based printing paper surface coating agent of the invention is produced and attached to a paper substrate, water (C) may be added in an amount of 5 to 200 times the mass of the stock solution.

4. Amine Organic Compound (D) The surface coating agent of the present invention may contain an amine organic compound (D). When the amine-based organic compound (D) is blended, the paper feeding property and the running property are improved. The blending amount of the amine-based organic compound (D) is the amino group-containing polysiloxane (A)
It is preferably 0.1 to 50 parts by mass based on 100 parts by mass of the acrylic resin (B) in total. If the amount of the amine-based organic compound (D) is larger than this range, the coating film tends to be sticky, which is not preferable, and if it is smaller than this range, the effect of the combination cannot be sufficiently obtained. The amine-based organic compound (D) used here is not particularly limited, but, for example, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methylpropanol or the like is used. it can.

5. Other components In the present invention, an amino group-containing polysiloxane (A),
As an ingredient other than the acrylic resin (B) and water (C), an emulsifier, an emulsion stabilizer, a sizing agent, an antislip agent, an antiseptic agent, an antifoaming agent, a viscosity adjusting agent, a pH adjusting agent, etc. may be added. it can. The amount of the other components blended is 100 in total of the amino group-containing polysiloxane (A) and the acrylic resin (B).
It is preferably 50 parts by mass or less with respect to parts by mass.

[0040]emulsifier In the present invention, amino group-containing polysiloxane (A)
Helps to dissolve acrylic resin (B) in water (C)
For this purpose, an emulsifier may be used. As an emulsifier,
Ionic surfactant, anionic surfactant, cation
Conventional surfactants such as surfactants and zwitterionic surfactants
Various known surfactants can be used. Surfactant ingredients
Examples include nonionic surfactants such as polyoxyethylene.
Ciethylene alkyl phenyl ether, polyoxyethylene
Len alkyl ether, polyoxyethylene alkyl ether
Stell, sorbitan fatty acid ester, silicone interface
Anionic interface such as activator or sucrose fatty acid ester
Activators such as alkyl sulphates, alkyl phenyl sulphates
Phonate or polyoxyethylene alkylphenyl sulphate
Cationic surfactants such as acid salts, such as alkyl trimes
Tylammonium chloride, dialkyldimethylan
Monium chloride, benzyltrimethylammonium
Zwitterionic surfactants, such as chlorides, such as Alky
Examples include rubetaine or alkyl amino acids.
One or more of these may be used. Amino Silicone
Stability of the composition when it reacts with vinyl or acrylic resin
Non-ionic surface activity
The use of agents is preferred. Interface for aminosilicone emulsification
HLB (hydrophilic group / lipophilic group balance) value of activator is 8 to 1
It is preferable to select it to be 5.

[0041]Emulsion stabilizer In the present invention, the amino group-containing polysiloxane (A) and
To facilitate the dissolution of acrylic resin (B) in water (C),
The formed water-based
Marjong storage stability, dilution stability, mechanical stability,
In order to improve thermal stability, transparency, usability, etc., milk
A chemical stabilizer may be used. As an emulsion stabilizer, 25
Glycol ether which dissolves in water at any ratio at ℃
Is preferred. Such glycol ethers include
Tyryl glycol monomethyl ether, diethyl glycerin
Cole monomethyl ether, trimethylol glycol
Nomethyl ether, propylene glycol monomethyl ether
Ether, dipropylene glycol monomethyl ether,
Tripropylene glycol monomethyl ether, ethyl
Luglycol monoisopropyl ether, ethyl glycol
Cole monopropyl ether, diethylyl glycol
Nopropyl ether, propylene glycol monopropy
Ether, polyethylene glycol monoisopropyl ether
Ether, ethylene glycol monobutyl ether, die
Tyrel glycol monoisobutyl ether, diethylel
Glycol monobutyl ether, trimethylol glyco
Rumonobutyl ether, ethylene glycol monoisobu
Examples include chill ethers, which may be used alone or in two kinds.
The above may be used in combination.

[0042]Sizing agent In the present invention, for example, cation-modified starch, oxidation
Starch, polyvinyl alcohol, polyacrylamide
May be used.

[0043]Anti-slip agent In the present invention, for example, anionic, cationic, non-ionic
Nonionic rosin ester emulsion as anti-slip agent
May be used.

[0044]Preservative In the present invention, for example, 2- (4-thiazolyl) ben
Zoimidazole 10,10-oxybisphenoxya
Rusine, N- (fluorodichloromethylthio) phthali
Mido, 2,3,5,6-tetrachloro-4- (methyls
Rufonyl) pyridine may be used as a preservative.

[0045]Antifoam In the present invention, for example, dimethylpolysiloxane, etc.
You may use the defoaming agent of.

[0046]Viscosity modifier In the present invention, for example, sodium alginate, carboxylic acid
Viscosity adjustment of dimethyl cellulose, sodium polyacrylate, etc.
A formulating agent may be used.

[0047]pH adjuster In the present invention, for example, acetic acid, propionic acid, lactic acid,
PH adjustment of citric acid, glutamic acid, aspartic acid, etc.
Agents may be used.

However, in the surface coating agent of the present invention, the components other than the amino group-containing polysiloxane (A), acrylic resin (B) and water (C) constituting the surface coating agent are amino. The total amount of the group-containing polysiloxane (A) and the acrylic resin (B) is required to be 50 parts by mass or less with respect to 100 parts by mass. When the amount is more than 50 parts by mass, the effect of the present invention is sufficiently exerted. It may not be performed, which is not preferable. A particularly preferred numerical range is less than 10 parts by mass with respect to 100 parts by mass.

6. Surface coating agent and method for producing the same The surface coating agent of the present invention is an aqueous composition containing the amino group-containing polysiloxane (A) and the acrylic resin (B). The amino group-containing polysiloxane (A) and the acrylic resin (B) are uniformly dispersed in water in an emulsified state, a dissolved state, or the like. When the amino group-containing polysiloxane (A) and the acrylic resin (B) are dispersed together in water, the amino group-containing polysiloxane (A) and the acrylic resin (B) are bonded to each other during the process, resulting in a very high temperature. It is difficult to obtain a uniform water-based composition because the viscosity is increased and aggregates are generated. Therefore, it is preferable to separately disperse them in water in advance and then mix them. Dispersion in water is possible by a standard method. For example, an emulsification method can be adopted in which the amino group-containing polysiloxane (A) or the acrylic resin (B) is mixed with an emulsifier and water is gradually added while stirring. Further, as described above, a commercially available amino group-containing polysiloxane emulsion or acrylic resin emulsion can also be used. The concentration of the surface coating agent is not particularly limited, but the solid content (1 g, 105 ° C, 30 minutes) is 0.01 to 20% by mass,
In particular, 0.1 to 10% by mass is preferable because it is easy to uniformly coat the paper. Alternatively, a high concentration composition may be produced and adjusted to the above concentration at the time of use. The ratio of the amino group-containing polysiloxane (A) to the acrylic resin (B) in the surface coating agent is not limited, but the mass ratio is 1.0 / 20.
0-1.0 / 1.0, especially 1.0 / 100-1.0 /
It is preferably 5.0.

7. Printing Paper The printing paper of the present invention is obtained by applying the surface coating agent to paper and then drying it. The paper is not particularly limited,
Commercially available general paper can be used. The method of coating the paper is not limited, and examples thereof include a method of coating the surface of the paper with the surface coating agent or impregnating the surface coating agent. For the coating, known methods such as a size press method, a roll coater method, a blade coater method and an air knife coater method can be adopted. There is no limit to the drying method,
It may be left for several minutes to several hours at room temperature, but in order to accelerate the drying time, it is dried under heating, for example, at 50 to 100 ° C.,
You may apply wind. The coating amount is not particularly limited,
The ratio of solid content (1 g, 105 ° C., 30 minutes) to paper is 0.05 to 10 g / m ² , preferably 0.2 to 5 g / m ² .
^The amount of ² is preferable because the effect of the present invention is sufficiently exhibited.

[0051]

EXAMPLES Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples, and all the embodiments utilizing the technical idea of the present invention are as follows. It is included in the scope of the invention.

[0052]Examples 1-12 and Comparative Examples 1-18 Amino silicones shown in Table 1 (polysiloxane containing amino groups
Emulsion containing 40% by mass of each
And the acrylic resin having the acid value shown in Table 1 is 50
Emulsion blended by mass% is mixed at a mass ratio of 1: 4
And further dilute with water to obtain solids (1g, 105 ° C, 30
Min) to 5 mass% to prepare the surface coating agent of the present invention.
It was Further, in Examples 8 to 12, the amine-based organic compounds are listed in the table.
The indicated amount was blended. In addition, the coating agent contains water and amino groups
The components other than polysiloxane and acrylic resin
No group polysiloxane and acrylic resin total 10
The blending amount with respect to 0 parts by mass is also shown in Table 1 as "Other component amounts".
And show it. The compositions of Table 2 were similarly prepared for the comparative example.
It was

[0053]

[Table 1]

[0054]

[Table 2]

This coating agent was coated on glass and then at 70 ° C. for 1
After drying for 0 minutes, the appearance, stickiness and water resistance of the coating film were evaluated, and the results are shown in Table 3.

[0056]Evaluation criteria: Appearance ◎: transparent film ○: A slightly opaque but uniform film X: Opaque and non-uniform filmEvaluation criteria: Sticky feeling ◎: No sticky feeling when rubbed with fingers ○: It feels slightly sticky when rubbed with a finger Δ: It feels sticky when rubbed with a finger. ×: The film adheres to the finger just by touching it lightlyEvaluation criteria: Water resistance Drop water with a pipette, and after 30 seconds with tissue paper
Wipe off the water and visually observe the remaining state of the coating film. A: No change at all. ○: Some dissolution is observed Δ: The film is considerably dissolved X: The film was dissolved and hardly remained.

[0057]

[Table 3]

Further, this surface coating agent is applied to commercially available PPC paper.
Applied to 1.0g / m^TwoWas formed.Inkjet recording paper adaptability Seiko Epson inkjet pudding on this coated paper
Printing using a PM700C
Printing condition (ink strike through, feathering, print darkness)
Degree) and the results are shown in Table 3.Evaluation standard: strike-through of ink The printed part is visually observed from the back side of the paper, and there is minimal strike-through.
An item was marked with ⊚ and a marked item was marked with x, and the evaluation was made by a four-level evaluation.Evaluation criteria: Feather ring The degree of ink bleeding in the fine line print area was visually evaluated and
Low was rated as x and the highest was rated as ⊚, and the evaluation was made by a four-level evaluation.Evaluation criteria: print density Visually observe the density of the printed area, the print is dark and the color development is clear.
◎, the print is thin, and the color development is unclear 4 ×
It was judged by graded evaluation. Transfer paper compatibility for electrophotographyEvaluation criteria: Paper feeding Fuji Xerox electronic photograph of 2500 sheets of A4 size coated paper
That one-sided paper was passed through the DocuCentre 400 copying machine
Evaluate based on the number of paper jams and double feed
The results are shown in Table 3.

As is clear from Table 3, the paper coated with the coating agent of the present invention has no stickiness on the surface and no change in appearance, has excellent water resistance, has little strike-through when ink jet printing, and has a feather. The number of rings is small, the print density is high, and the paper feedability is excellent even when used as a transfer paper for electrophotography. On the other hand, none of the papers coated with a coating agent other than the present invention satisfied all the properties.

[0060]

INDUSTRIAL APPLICABILITY The surface coating agent of the present invention does not cause bleeding or strike-through when applied to an ink jet recording paper, and imparts excellent surface physical properties such as resolution and color density, and for electrophotography. When applied to transfer paper, there is an effect that good paper feeding properties and running properties can be imparted. Therefore, the printing paper in which the surface coating agent of the present invention is applied to the surface of the paper base material can be used as an inkjet recording paper and also as a transfer paper for electrophotography. It is possible to reduce costs in distribution and sales, and to prevent printing paper users from making mistakes in inventory management and use.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naoki Suzuki             4-11-10-302 Minamikasai, Edogawa-ku, Tokyo F-term (reference) 2H086 BA31 BA34                 4L055 AG11 AG27 AG71 AG86 AH02                       AH23 AH33 BE08 EA30 EA32                       FA15 GA09 GA11

Claims (10)

[Claims] 1. A water-based printing paper surface coating agent comprising an amino group-containing polysiloxane (A), an acrylic resin (B) and water (C). 2. The amino group-containing polysiloxane (A) is
The water-based printing paper surface coating agent according to claim 1, which is represented by the following general formula (1). [Chemical 1] (In the formula, R ¹ is an alkyl group or an aryl group having 1 to 8 carbon atoms, and X is — (CH ₂ ) a (NH— (CH ₂ )).
₂ ) bNH ₂ is a group represented by Y is X or —CH _3.
Is a group represented by, m is a positive number from 0 to 800, and n is 0 to
A positive number of 150, a is an integer of 2 to 6, and b is 0 or 1. However, when n = 0, one or more Y is-(C
H ₂₎ is a group represented by _{a (NH- (CH 2) 2} ) bNH 2. ) 3. The aqueous system according to claim 2, wherein the amine content (converted to —NH ₂ ) in the amino group-containing polysiloxane (A) is 0.5 to 3.0 mass%. Printing paper surface coating agent. 4. The acid value of the acrylic resin (B) is 0 to 5
It is 0 mgKOH / g, The water-based printing paper surface coating agent according to claim 1. 5. The content ratio of the amino group-containing polysiloxane (A) and the acrylic resin (B) is 1.0 / mass ratio.
It is 200-1.0 / 1.0, The water-based printing paper surface coating agent of Claim 1 characterized by the above-mentioned. 6. The water-based printing paper surface coating agent according to claim 1, further comprising an amine-based organic compound (D). 7. The content of the amine-based organic compound (D) is
The water-based printing paper surface coating according to claim 6, wherein the total amount of the amino group-containing polysiloxane (A) and the acrylic resin (B) is 0.1 to 50 parts by mass based on 100 parts by mass. Agent. 8. Amino group-containing polysiloxane (A) having a total content of other components to be blended in addition to the components (A) to (C).
The water-based printing paper surface coating agent according to claim 1, which is 50 parts by mass or less based on 100 parts by mass of the acrylic resin (B) in total. 9. First, a first aqueous composition containing an amino group-containing polysiloxane (A) and a second aqueous composition containing an acrylic resin (B) are separately prepared, and then the first aqueous composition is prepared. 9. The method for producing a water-based printing paper surface coating agent according to claim 1, wherein the water-based composition and the second water-based composition are mixed. 10. A printing paper obtained by applying the water-based printing paper surface coating agent according to any one of claims 1 to 8 on at least one surface of a paper substrate and then drying the coating.