JPH11227324A - Recording paper and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the transferring and fixing properties of toner by coating a coating liquid consisting of a water soluble polymer, a cationic styrene acrylic copolymer epichlorohydrine quaternary compound or the like on a carrier consisting of mainly cellulose pulp or the like. SOLUTION: As a carrier of smooth surface recording paper having no coat layer containing a pigment, there is used an original paper formed of preparing, e.g. a 1,000 wt.kg pulp having a blending ratio of N-BKP/L-BKP=5/95 into a freeness of 450cc (CSF), and applying light calcium carbonate, white carbon (noncrystalline silica), fluorescent dye, sulfuric acid band, an inner sizing agent (neutral rosin), and the like. In addition, coated and impregnated therein is a coating liquid consisting of mainly polyvinyl alcohol, cationic styrene acrylic copolymer epichlorohydrine quaternary compound, and a cationic acrylic ester monomer copolymer in a predetermined amount, thereby producing a recording paper for electrophotography, ink jet, thermal transfer or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The recording paper of the present invention exhibits excellent performance as a toner transfer paper of an electrophotographic recording system, and can be used for recording by an ink jet system and for recording, printing, and writing with another pen plotter using an aqueous ink. The present invention relates to a recording paper which can be used, is excellent in writability using a pencil, a ball-point pen or the like, and is excellent in transfer by a thermal transfer method, and can be used for these purposes, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, information systems have been remarkably developed, and accordingly, various recording systems suitable for each information system have been developed. The use of electrophotographic recording, ink-jet recording, and thermal recording media, which have greatly contributed to the realization of these high-quality images represented by colorization, as well as higher copy / printing speeds The thermal head recording method is widely used.

The transfer paper used in the electrophotographic system is required to have a toner transfer property and a fixing property, and a running property such as paper supply and paper discharge. It is known that if it is weak, toner will drop off or paper dust will increase. That is, coated paper having a coating layer containing a large amount of pigment is not suitable for this application because the pigment is easily dropped and paper powder is easily generated.

[0004] In addition, a paper dedicated to ink jet is generally provided with a coat layer containing a pigment in order to secure color developability and ink absorbency. In order to obtain better resolution and gradation, it is necessary to use a recording sheet that is excellent in ink absorbency while suppressing the spread of ink. In the case of a color ink jet, color development, water resistance, light resistance and the like are further required.
Since it is necessary to rapidly absorb and fix a large amount of ink in order to satisfy these performances, the coating layer containing the pigment must be thick. As a result, there are problems such as poor writability in terms of quality and easy generation of paper dust. On the manufacturing side, the post-processing method using an off-coater is adopted because of the marketability of inkjet-dedicated paper or the difficulty in designing a design that balances the coating amount, the physical properties of the coating liquid, and the coating method. It is common. For this reason, there has been a problem that the cost of chemicals and the cost of operation are extremely high.

The thermal head system is excellent in various aspects, such as being compact and low in noise, and having high water resistance of the ink jet. Unlike a so-called impact type printing mechanism, a printing medium is overlaid on a printing medium, and the printing medium is beaten from above the printing medium and printed by strongly contacting the printing medium with a printing medium such as paper. The thermal fusible ink layer on the print medium is thermally transferred to a print target such as paper without printing by simply contacting the thermal head from above. Is known to be greatly affected by the smoothness of the surface of the printing medium. In other words, when paper to be printed is made of paper having a large surface irregularity (rough paper), the heat-meltable ink melted by the contact heat of the thermal head does not adhere to the rough paper.
Since it adheres only to the protruding portions, there is a problem that the end of the print is chipped or missed, the print is not clear, and the print quality is poor.

[0006]

As described above, since the required characteristics are mixed, the printing by the electrophotographic system and the ink jet system, and the printing by the thermal head system using a heat-sensitive recording medium can be used, and the recording performance and running performance can be improved. It has been extremely difficult to develop a recording sheet that can satisfy the characteristics and economy.

With the widespread use of ink jet recording, the functions of plain paper typified by copy paper, the functions of thermal transfer type thermal transfer paper using a thermal recording medium, and recording paper improved for ink jet recording Once developed, the image of plain paper changes completely.

Accordingly, an object of the present invention is to transfer and transfer toner.
It is an object of the present invention to provide a recording paper having excellent fixability, which can also be used as a thermal head type thermal transfer paper using an electrophotographic transfer paper, an ink jet recording paper, and a thermal recording medium, and a method of manufacturing the same.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a recording paper having a smooth surface and no coating layer containing a pigment, that is, N- 1000 weight kg of pulp having a mixing ratio of BKP / L-BKP = 5/95 was prepared to a freeness (CSF) of 450 cc, light calcium carbonate 90 kg, white carbon (amorphous silica) 20 kg, fluorescent dye 1.5 kg, A base paper (weight is the packing weight) to which 15 kg of a sulfuric acid band having a concentration of 7.5% in terms of alumina and 6.0 kg of an internal sizing agent (neutral rosin) was added was added a polyvinyl alcohol, a cationic styrene acrylic copolymer epichlorohydrin quaternary compound. ,
A coating liquid containing a cationic acrylic ester monomer copolymer as a main component is applied by on-machine size press treatment to obtain a solid content of 1.0 to 2.0 g / m ^2, and a final rice tsubo of 80 g / m2 is applied.
The present invention was completed by adjusting m ² , thickness 95 μm, and smoothness to 90 seconds (Beck).

As a result, the electrophotographic paper is excellent in the transferability and fixing property of the toner, the running property is good, and the ink-jet recording paper has good color development, water resistance, little bleeding, and uses a heat-sensitive recording medium. As a thermal transfer paper of the thermal head type, a recording paper having the feature that the printed portion was clear was obtained. This recording paper is characterized by the chemicals to be applied, and at least one side of the support has a solid content of 1.
The above quality can be satisfied even by applying a very small amount of 0 to 2.0 g / m ² . Therefore, there is no need to form a thick coating layer, and it can be easily manufactured by on-machine post-processing (size press). It is highly cost-effective in terms of chemicals and operation, and can be provided at the same price as plain paper (such as copy paper).

In the recording paper of the present invention, in order to satisfy the color developing property and water resistance by the ink jet method with a clear coat liquid containing no inorganic or organic pigment, it is important to select a chemical which is a main component of the coating liquid. And a water-soluble polymer, a cationic styrene acrylic copolymer, an epichlorohydrin quaternary compound, and a cationic acrylic ester monomer copolymer.

[0012] A general high-quality paper type recording paper absorbs ink into the cellulose fibers themselves, or between the fibers or the gap formed by the filler and the fibers. The ejected ink does not stay in the vicinity of the recording paper. Deep penetrates deep into the layer. As a result, due to irregular reflection of light due to the fibers or fillers in the upper layer of the recording paper, it does not contribute as a dye coloring density.

The recording paper according to the present invention contains the above water-soluble polymer substance in the upper layer of the recording paper in a solid content of 0.3 to 2.
It was provided so as to be 0 g / m ² (one side), and the scattering of light was suppressed by increasing the transparency of the upper layer portion of the recording paper.

Specific examples of the water-soluble polymer substance include, but are not limited to, polyvinyl alcohol (Kuraray Co., Ltd., trade name Kuraray Poval PVA117, Denki Kagaku Kogyo Co., Ltd., trade name K-17). It is not something to be done. A substance that suppresses light scattering by fibers or fillers in the upper layer of the support corresponds to this. For example, modified P
Similar effects can be obtained with VA, polyacrylamide, modified polyacrylamide, polyamide resin, acrylic resin, polyamide epichlorohydrin, styrene / acrylic copolymer, melamine resin, polyamide epoxy resin, and the like.

Also, so-called latex polymers other than these water-soluble polymers, for example, acrylic copolymer resins, acrylic / vinyl acetate copolymer resins, vinyl acetate resin epoxy resins, vinylidene chloride, SBR, NBR,
Similar effects can be obtained with MBR. However, in terms of cost,
A water-soluble polymer substance is desirable from the viewpoint of good operability during production.

The dye used in the ink for ink jet recording has a sulfonate group (—SO ₃ Na) in a chemical structure as an acidic dye, and the dye itself is soluble in water. Is not sufficiently water-resistant, and ink dyes flow out due to adhesion of water or the like, and characters or images cannot be read.

The ionicity of the chemical used in the dye fixing agent (waterproofing agent) is preferably anionic in consideration of compatibility with other chemicals. However, anionic or nonionic dye fixing agents are not sufficient to make the dye insoluble in water.

In the recording paper of the present invention, by using a cationic acrylic ester monomer copolymer, a complex is formed with an anionic dye, so that an insolubilized recorded image can be formed.

These coating liquids may contain various additives. In order to improve the work during coating, a leveling agent, a defoaming agent,
Waxes for improving post-processing properties, fluorescent dyes for improving whiteness by visual perception, and so-called antistatic agents composed of surfactants and inorganic salts for imparting conductivity can be contained. It is also possible to obtain a higher printing quality by including a cationic fixing agent as a fixing agent for the ink. In addition, an ultraviolet absorber, a dye and the like can be added according to the purpose.

In order to satisfy conditions such as good ink absorptivity and high absorption speed in the ink jet recording system, no bleeding or thickening of fine lines in an image portion, good dot resolution, and clear color, It is important to select the filler in the support and the chemical of the coating liquid. In the support, the porous filler is used, and in the coating liquid, the cationic styrene acrylic copolymer epichlorohydrin quaternary compound satisfies this condition.

The colorants used in the color ink jet recording system are composed of four colors of black (Bk), cyan (C), magenta (M), and yellow (Y). Expresses color. Therefore, it is necessary for the ink to quickly penetrate into the medium. If the permeation is slow, the ink spreads on the surface and the dots become large, the inks of different colors are mixed to make the color dirty, and the fixing time after printing becomes longer. The recording paper according to the present invention has, as an ink receiver, a porous filler having a high ink absorption capacity and an appropriate size, which absorbs the flying ink instantaneously, and the above problem does not occur.

The same effect can be obtained by using the porous filler alone or in a mixture with another filler. For example, the same effect can be obtained by mixing with titanium dioxide, heavy calcium carbonate, light calcium carbonate, kaolin, talc, urea resin or the like for reasons such as increasing opacity and gloss.

Further, there is a need for the ink jet recording system to print with a monochrome type ink, and there is also a demand for a high color density and a small bleeding / thickening of a thin line portion in an image portion. For this purpose, it is effective to lower the critical surface tension of the liquid / solid layer in the surface layer of the recording paper, which is satisfied by lowering the surface tension of the surface layer of the recording paper using a surface sizing agent or the like.

As the chemicals corresponding thereto, styrene / acrylic surface sizing agents and the like are generally known. However, when a surface sizing agent having an anionic ionic property is used, a waterproofing agent (cationic acrylic ester monomer copolymer) is used.
Cannot be used due to poor compatibility with The cationic styrene acrylic copolymer epichlorohydrin quaternary compound of the present invention satisfies these requirements and has good compatibility with other chemicals in the coating liquid. Another feature is that the size effect and stability are improved by quaternizing with epichlorohydrin or the like as compared with the tertiary amine state.

In the electrophotographic recording, as described above, important conditions for satisfying the transferability and the fixability of the toner include high surface strength and low generation of paper dust. The present invention is characterized in that the coating layer does not contain various inorganic and organic pigments, and the pigment on the surface falls off very little, satisfying this condition.

In the function of the thermal head type thermal transfer paper using the thermal recording medium, good print quality can be obtained when the surface roughness is small as described above. The recording paper of the present invention satisfies this condition by making the surface structure smoother than ordinary ink-jet paper and copy paper, and the print quality is sufficiently satisfactory.

The weight of the coating or impregnation required for the water-soluble polymer substance, which is the main component of the coating liquid, to obtain a high color density in the ink jet recording system is 0.3 g / m ^{2 in} terms of solid weight (at least one side). ２．０2.0 g / m ² . When the coating or impregnated weight is less than 0.3 g / m ² , the effect of increasing the transparency of the upper layer of the recording paper is small, and a high color density cannot be obtained. If the coating or impregnated weight is more than 2.0 g / m ² , the cost will increase, as well as obstruction of ink absorption of the support, and dot gain and bleeding will occur.
The image deteriorates.

In order to satisfy the demands such as the cationic styrene acrylic copolymer epichlorohydrin quaternary compound having high color density and small bleeding and fattening of the thin line portion in the image area when printed with a monochrome type ink. Is satisfied by coating or impregnating one side with a solid content weight in the range of 0.02 to 0.5 g / m ² . When the coating or impregnated weight is less than 0.02 g / m ² , the effect of lowering the critical surface tension of the liquid / solid layer on the surface of the recording paper is small,
The image density is low, and bleeding occurs in a thin line portion or the like. If the coating or impregnated weight exceeds 0.5 g / m ² , the cost may increase, but the critical surface tension of the recording paper surface layer is too low, and printing on models other than monochrome-only machines (full-color models) This causes a phenomenon (color repelling) that the color ink is not uniformly expressed on the recording paper.

The weight of the coating or impregnation required for the cationic acrylic ester monomer copolymer to maintain the water resistance of the printed image is 0.1 to 2.0 g / m ^{2 on} at least one side.
It is. When the coating or impregnated weight is less than 0.1 g / m ² , the water resistance of the printed image is insufficient. In addition, 2.0 g /
If it exceeds m ² , the same effect can be obtained, but it is not satisfactory in terms of cost.

In the ink jet recording system, the ink absorbs well and has a high absorption speed, there is no bleeding or thickening of fine lines in the image area, the resolution of dots is good, and the color is clear because it satisfies conditions such as: The higher the oil absorption of the filler is, the better it is. 100 ml / 100 g or more corresponds to this, but it is preferably 150 ml / 100 g or more. If the oil absorption is less than 100 ml / 100 g, the ink absorption rate is low, and a satisfactory ink jet image cannot be obtained. The oil absorption was measured according to JIS K 5101.19.

The smaller the particle size of the porous filler is, the better. (Comparing a small particle with a large particle at the same addition amount, the smaller particle has a larger number of particles. High) and having a large particle size are not preferred because the dispersion in the support is poor and a satisfactory image cannot be obtained, and the smoothness of the support decreases. When the particle diameter is 15 μm or less, the uniformity in the support is increased (the filler is dispersed), so that the ink can be absorbed uniformly. The particle size was measured by the Coulter counter method.

The content ratio of the porous filler for obtaining a sufficiently satisfactory printed image is 1 to 6% by weight.
When the content is less than the weight%, bleeding or thickening of a thin line in an image portion,
Border bleeding or the like occurs and the image deteriorates. If the content exceeds 6% by weight, the cost may increase, but the paper strength decreases, which is not preferable.

The surface characteristics of the recording paper are desirably 90 seconds or more in terms of smoothness (Beck) and 12 or more in terms of surface strength (WAX). When the smoothness is less than 90 seconds, the printed image from the thermal transfer printer is not adhered to the unevenness of the rough paper because the heat-fusible ink melted by the contact heat of the thermal head adheres only to the protrusions. Because
The end of the print is chipped or missing, resulting in poor print quality and poor print quality. When the smoothness exceeds 200 seconds, when printing by the electrophotographic method, the ink jet method, and the thermal transfer method, when feeding in a sheet form, paper feeding failure, a copying machine,
It is not preferable because poor transportability occurs in the printer.

On the other hand, if the surface strength is less than 12, it is not preferable because, during printing in the electrophotographic system, paper powder is generated due to the dropping off of fillers and the like and drops off after fixing the toner.

The recording paper according to the present invention, once formed,
Even if impregnated or coated with off-machine, the same quality of recording paper can be obtained.However, compared to products manufactured on-machine, the cost of operation is higher and plain paper represented by copy paper etc. Is not economically satisfactory. Examples of post-processing methods in on-machine include various size presses, coaters such as inclined size presses, gate roll size presses, air knife coaters, rod coaters, blade coaters, roll coaters, comma coaters, gravure coaters, and lip coaters. Although it is possible to apply with the use of such a material, a processing method using a size press is preferable in consideration of the physical properties of the liquid and the amount of coating.

Furthermore, rosin, alkenyl succinic anhydride, alkyl ketene dimer, petroleum resin-based sizing agent, etc. can be used as the internal sizing agent used for forming the support of the present invention.

Further, in the paper stock, other additives such as a pigment dispersant, a thickener, a flow improver, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrant, a coloring dye and a coloring pigment. Fluorescent dyes, ultraviolet absorbers, antioxidants, preservatives, anti-binders, water-proofing agents, wet paper strength enhancers, dry paper strength enhancers, etc. are appropriately compounded within a range that does not impair the desired effects of the present invention. You can also.

In the papermaking method of the present invention, a paper machine known in the papermaking industry, such as a fourdrinier paper machine, a twin wire paper machine, a combination paper machine, a round mesh paper machine, and a Yankee paper machine, can be used as appropriate.

[0039]

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. The number of copies in Examples and Comparative Examples is all based on weight (package conversion). Example 1 Preparation of Coating (Impregnation) Solution Into 1862.3 parts of water, 80 parts of polyvinyl alcohol (trade name: Poval PVA-117, manufactured by Kuraray Co., Ltd.) was added and gelatinized by a conventional method. Merged epichlorohydrin quaternary compound (manufactured by Seiko Chemical Co., Ltd .:
10 parts of trade name Pearl Gum CS, cationic acrylic ester monomer copolymer (manufactured by Seiko Chemical Co., Ltd .: trade name MD-)
107) 20 parts, a lithium-based antistatic agent (manufactured by Meisei Chemical Co., Ltd .: trade name Derekol P-910), 5 parts, and a release agent (manufactured by San Nopco Co., trade name: Nopco 1152M) 2.7 parts were added to adjust the total to 2000 parts. To achieve.

Coating by on-machine size press using a paper machine N-BKP (trade name: Housand) / L-BKP (trade name: Senibra) = 1000 parts by weight of pulp having a mixing ratio of 5/95 were measured for freeness (CSF). Formulated to 450cc, light calcium carbonate (trade name: Tamapearl TP-1 manufactured by Okutama Industry Co., Ltd.)
21) 90 parts, 20 parts of white carbon (trade name: Tokusil GU-N, manufactured by Tokuyama Co., Ltd.), 1.5 parts of a fluorescent dye (trade name: Keicoll BUL, manufactured by Nippon Soda Co., Ltd.), and a sulfate band having a concentration of 7.5% in terms of alumina. 15 parts, 6.0 parts of an internal sizing agent (trade name: NT-85, manufactured by Arakawa Chemical Industry Co., Ltd.) was added to prepare a papermaking raw material, and the papermaking was performed by a fourdrinier multi-cylinder paper machine (parts by weight are packing weight parts). . At this time, the above coating liquid was applied by a size press so that the wet adhesion amount was 20 cc on one side.
Final rice tsubo 80 g / m ² , thickness 0.095 mm, smoothness 9
Papermaking was performed so as to be 0 seconds (Beck).

Example 2 The same as Example 1 except that the final rice tsubo was 64 g / m ² .

Example 3 Polyacrylamide (manufactured by Harima Chemicals, Inc., trade name Haricoat G-160) 40 parts of polyvinyl alcohol 80 parts
The same operations as those of the first embodiment are carried out except that the composition is changed to a part.

Example 4 The same procedure as in Example 1 was carried out except that 20 parts of white carbon of the support was changed to 20 parts of synthetic aluminum silicate (manufactured by KOFRAN CHEMICAL, trade name: TIXOLEX17).

COMPARATIVE EXAMPLE 1 Preparation of a coating (impregnation) liquid
The procedure is the same as that of the first embodiment, except that 0 parts is prepared as 20 parts.

Comparative Example 2 In the preparation of the coating (impregnation) liquid, the number of parts of the cationic styrene acrylic copolymer epichlorohydrin quaternary compound was 1
The procedure is the same as that of the first embodiment except that the composition is changed from 0 parts to 1 part.

Comparative Example 3 In preparing the coating (impregnating) liquid, the number of the cationic acrylic ester monomer copolymer was changed from 10 parts to 5 parts.
Other than the preparation, it is the same as the first embodiment.

Comparative Example 4 The procedure of Example 1 was repeated except that the number of parts of the porous filler (white carbon) of the support was changed from 20 parts to 10 parts, and the composition was adjusted.

Comparative Example 5 A porous filler (white carbon) as a support was replaced with light calcium carbonate (Okutama Kogyo Co., Ltd .; trade name: Tamapearl TP-).
121) Change to 20 parts, light calcium carbonate for a total of 11
Except that the adjustment was made to 0 parts and the preparation was carried out, it was the same as Example 1.

Comparative Example 6 Porous Filler for Support (White Carbon: Average Particle Size 8
μm) as amorphous silica (Mizukasil P-78F, trade name: average particle size: 12 μm, manufactured by Mizusawa Chemical Industry Co., Ltd.), and preparation was the same as in Example 1.

Comparative Example 7 Porous Filler for Support (White Carbon: Average Particle Size 8)
μm) was changed to amorphous silica (manufactured by Tokuyama Co., Ltd., trade name: Tokusil PR: average particle diameter: 100 μm), and preparation was the same as in Example 1.

Comparative Example 8 The same operation as in Example 1 was conducted except that the smoothness (BACK) of the recording paper was changed from 90 seconds to 35 seconds.

Comparative Example 9 The same procedure as in Example 1 was carried out except that the number of parts of polyvinyl alcohol in the coating liquid was 40 parts, the number of parts of white carbon was 50 parts, and the surface strength of the recording paper was 9.

Comparative Example 10 The cationic styrene acrylic copolymer epichlorohydrin quaternary compound in the coating solution was replaced with an anionic styrene acrylic surface sizing agent (Polymalon 13 manufactured by Arakawa Chemical Co., Ltd.)
43S) is the same as in the first embodiment.

Comparative Example 11 Comparative Example 10 was the same as Comparative Example 10 except that the ionic ratio of the cationic acrylic ester monomer copolymer in the coating liquid was changed from cation 100 to anion / cation = 25/75.

Comparative Example 12 Exclusive paper of ink jet system (KJ-12, manufactured by KOKUYO Co., Ltd.)
10).

Comparative Example 13 Thermal transfer type thermal transfer paper (trade name: HR-100, manufactured by Hokuetsu Paper Mills).

Comparative Example 14 Electrophotographic recording paper (manufactured by Fuji Xerox Office Supply Co., Ltd., trade name: Multi-ace)

Tables 1 and 2 show the evaluation results of the examples and comparative examples, respectively.

[0059]

[Table 1]

[0060]

[Table 2]

The evaluation method of each characteristic in each of Examples and Comparative Examples is as follows. Inkjet suitability a) Full-color dedicated machine (printing model: Epson PM-70)
0C) Color density After printing, the color development of solid portions of cyan, magenta, yellow and black was compared and evaluated visually. High density and vividness: ： Intermediate level between ○ and ×: △ Low density, no vividness: × · Bleeding After printing, fine line feathering and line thickening were compared and evaluated visually. Good: slightly bleeding, slightly thick: △ bleeding, thick: × · Water resistance After printing, the ink was immersed in running water for 5 minutes, and the ink remaining rate was compared and evaluated. Ink remains almost completely: ○ Intermediate level between ○ and ×: △ Ink almost leaks: ×

B) Monochrome dedicated machine (printing model: Epson MJ-500) Color density After printing, the color development of solid black portions was compared and evaluated visually. High density and vividness: ： Intermediate level between ○ and ×: △ Low density, no vividness: × · Bleeding After printing, fine line feathering and line thickening were compared and evaluated visually. Good ： ○ Slightly bleed, Slightly thick ： △ Bleed, Thick ： ×

Applicability to electrophotographic paper Printing machine: Able 1405 manufactured by Fuji Xerox Co., Ltd. Transferability The density and blur (recording unevenness) when a pattern having many solid portions was printed were compared and evaluated. Concentration is not high and does not fade: ◎ Slightly bad but practical level is: ○ Density is low (blurring): × ・ Toner fixation After printing and humidity control, tested on Gakushin type abrasion resistance tester under 10 reciprocal conditions, no load. Check the amount of toner on the cloth
Comparative evaluation was performed. The toner hardly adheres: く A little, but practical level: Toner is a problem: ×-Toner drop Immediately after printing, a crease was formed on the print surface and the degree of toner drop was compared by visual evaluation. Almost no dropout is observed: ○ There is some dropout but practical use is possible: △ Many dropouts are not practical: × ・ Running characteristics After printing 100 sheets with Able, the flat plate curl was measured on the last 10 sheets. Comparative evaluation was performed. Good: ○ Intermediate level between ○ and ×: △ Large curl: ×

Suitability for thermal transfer paper Printing machine: MD-2000J manufactured by Alps Electric Co., Ltd. Transfer density The color density of the transfer solid portion was compared and evaluated. High density and vividness: ○ Intermediate level between ○ and ×: △ Low density, no vividness: × ・ Transfer uniformity When printing a pattern with many solid areas, it was visually evaluated whether print fading occurs. . A recording hardly causes unevenness or blurring: ◎ A slightly noticeable but not practical problem: ○ A practicable: ×

[0065]

As can be seen from the above description, the present invention provides a water-soluble polymer, a cationic styrene-acrylic copolymer epichlorohydrin quaternary compound on at least one surface of a support mainly composed of cellulose pulp and a porous filler. By coating or impregnating a coating liquid containing a cationic acrylic ester monomer copolymer, without providing a coating layer containing a pigment, color formation (print density, color vividness) and bleeding by an ink jet recording method Thus, a recording paper having good water resistance can be obtained.

Since the coating layer according to the present invention contains no pigment, it is excellent in electrophotographic printing, that is, excellent in toner transferability and fixability. The surface structure of the support is PPC
Because it is smoother than paper and inkjet paper,
It can be sufficiently used as thermal transfer paper by a thermal head method.

The coating amount range of the coating liquid containing a water-soluble polymer, a cationic styrene acrylic copolymer epichlorohydrin quaternary compound, and a cationic acrylic ester monomer copolymer as main components was 0.3 wt. ~ 2.0
^{g / m 2, 0.02~0.5g / m} 2, 0.1~2.0
g / m ² , so that recording paper satisfying the recording quality of electrophotography, ink jet, and thermal transfer can be obtained with a very small amount of chemicals. By specifying the particle size, oil absorption, and content of the porous filler, it is possible to obtain a recording paper having good ink jet suitability and good paper strength and surface characteristics without increasing the cost.

Further, since the present recording paper is applied and impregnated by an on-machine, it has a very high cost advantage as compared with a product manufactured by an off-coater or the like, and thus is typified by copy paper. It can be provided at the cost of plain paper, that is, at extremely low cost.

Further, in the production method according to the present invention, the chemical to be coated is, of course, characterized in that the chemical to be coated is applied on at least one surface of the support in a solid content of 1.0 to 1.0.
The above quality can be satisfied even by applying a very small amount of 2.0 g / m ² . Therefore, there is no need to form a thick coating layer, and it can be easily manufactured by on-machine post-processing (size press). It is highly cost-effective in terms of chemicals and operation, and can be provided at the same price as plain paper (such as copy paper).

Claims (14)

[Claims] 1. A coating liquid comprising a water-soluble polymer, a cationic styrene acrylic copolymer epichlorohydrin quaternary compound, and a cationic acrylic ester monomer copolymer on a support mainly composed of cellulose pulp and a porous filler. Is coated or impregnated with a recording paper. 2. The recording paper according to claim 1, wherein the porous filler in the support has an oil absorption of 150 ml / 100 g or more, and the porous filler has an average particle size of 15 μm or less. . 3. The recording paper according to claim 1, wherein the weight of the water-soluble polymer applied or impregnated is at least 0.3 to 2.0 g / m ^{2 on} one surface of the support. 4. The coating or impregnating weight of the cationic styrene acrylic copolymer epichlorohydrin quaternary compound is at least 0.02 to 0.5 g / m ^{2 on} one surface of the support. The recording paper according to 2 or 3. 5. The coating or impregnating weight of the cationic acrylic ester monomer copolymer is at least 0.1 to 2.0 g / m ^{2 on} one surface of the support. Or the recording paper according to 4. 6. The method according to claim 1, wherein the content ratio of the porous filler is 1 to 6% by weight.
2. The recording paper according to 2, 3, 4 or 5. 7. The recording paper according to claim 1, wherein the coating or impregnating liquid does not contain an inorganic or organic pigment. 8. The recording sheet according to claim 1, wherein the recording sheet has a smoothness of 90 to 200 seconds. 9. The recording paper according to claim 1, wherein the surface strength of the recording paper is 1 in WAX strength.
Claims 1, 2, 3, 4,
Recording paper according to 5, 6, 7 or 8. 10. The recording paper according to claim 1, which is used as an electrophotographic recording paper. 11. The recording paper according to claim 1, which is used as an inkjet recording paper. 12. Use as a recording sheet for thermal transfer.
The recording paper according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11. 13. A cellulose pulp having an oil absorption of 150.
a water-soluble polymer, a cationic styrene-acrylic copolymer, epichlorohydrin quaternary, on a support containing, as a main component, a porous filler having an average particle diameter of 15 μm or less and a content ratio of 1 to 6% by weight. Compound, a coating liquid comprising a cationic acrylic ester monomer copolymer, is applied or impregnated by on-machine treatment with a paper machine, and the coating of the coating liquid, or the impregnation amount is a water-soluble polymer. 0.3 to 2.0 g / m ² on at least one surface of the support
In the cationic styrene acrylic copolymer epichlorohydrin quaternary compound, the amount is 0.02 to 0.5 g / m ² on at least one side of the support, and in the cationic acrylic ester monomer copolymer, at least 0 on one side of the support. .1~2.0g / m ² in the range of amount of coating, or a manufacturing method of the recording sheet, which comprises impregnating. 14. The recording paper according to claim 13, wherein the amount of coating or impregnation of the coating liquid according to claim 13 is 1.0 to 2.0 g / m ² in terms of solid weight. Manufacturing method.