JP2018030282A - Method for manufacturing ink-jet recording paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide comparatively inexpensive ink-jet recording paper which has equivalent feeling to that general printing paper, has good ink dryness, makes white streaks in a solid printing portion inconspicuous.SOLUTION: A method for manufacturing ink-jet recording paper includes a step of coating a coating material for ink-receiving layer containing a white pigment other than silica and a styrene-butadiene-based resin on at least one surface of base paper, where the coating material for ink-receiving layer contains 0.01-0.15 pts.mass of an alkaline component with respect to 100 pts.mass of the white pigment and 0.01-3.00 pts.mass of a fine cationic polymer having a degree of cationization of more than 0 meq/g and 3.0 meq/g or less with respect to 100 pts.mass of the white pigment.SELECTED DRAWING: None

Description

  The present disclosure relates to a method of manufacturing an inkjet recording paper.

  The ink jet recording method is a method in which droplets of dye ink or pigment ink are ejected and deposited on a recording paper to form dots and recording is performed. In recent years, recording with high print quality has become possible due to technological advances in inkjet printers, inks, and recording paper. In fields such as commercial printing, so-called on-demand printing methods have been introduced that digitize variable information and print at high speed, and ink jet printers employing the on-demand printing method have also appeared. . Such an on-demand printing method is suitable for printing a small number of copies because information can be directly printed on a medium such as paper without making a plate. Recently, along with the expansion of applications due to remarkable progress in speeding up or high definition of equipment, there has been a demand for imparting inkjet suitability to general coated paper for printing (for example, general offset printing paper). Have been doing.

  In general printing coated paper, a coating layer containing a pigment and a binder is provided. In general, calcium carbonate or kaolin is used as a pigment in order to impart appropriate ink acceptability. However, when such a general coated paper for printing is applied to an ink jet printer, the absorbability of the ink for ink jet is remarkably worse than that for a general ink jet paper, and the image sharpness and the ink drying property are deteriorated. There is a problem that can not be tolerated. This is because the pore volume of the pigment used in the coating layer is remarkably low, and the pore volume of the coating layer is significantly reduced.

  Conventionally, in the ink receiving layer of an ink jet recording paper, the pore volume of the coating layer is increased by using a pigment having a large specific surface area as a main component as compared with calcium carbonate or kaolin such as silica, alumina or boehmite. However, ink jet recording paper using such a pigment is expensive and is not practical in the commercial printing field. Further, the texture is remarkably different from that of general printing paper, which is not preferable.

  As described above, since there are various problems in applying a general printing coated paper to an ink jet printer, printing paper with various improvements has been developed. As such a printing paper, an ink receiving layer coating liquid containing a vapor phase silica dispersion containing an alkali metal hydroxide, colloidal silica, and a resin is coated on a support and dried to receive ink. An ink jet storage medium provided with a layer is disclosed (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2002-274022

  However, the recording medium of Patent Document 1 is expensive because silica is used, and the texture as general printing paper is not preferable. Further, since silica is used, when performing solid printing with an ink jet printer, there is a possibility that white streaks are generated due to insufficient ink spreading but insufficient ink spreading.

  The present disclosure has been made in view of such a problem, and the object of the present disclosure is that the texture is the same as that of general printing paper, the ink drying property is good, and the white streaks of the solid printing portion are conspicuous. In other words, a relatively inexpensive inkjet recording paper is provided.

  In order to solve the above-mentioned problems, an ink jet recording paper manufacturing method according to the present invention applies an ink receiving layer coating material containing a white pigment other than silica and a styrene-butadiene resin on at least one surface of a base paper. In the method for producing an inkjet recording paper having a step, the ink-receiving layer coating material contains 0.01 to 0.15 parts by mass of an alkali component with respect to 100 parts by mass of the white pigment, and has a cationization degree of 0 meq. It is characterized by containing 0.01 to 3.00 parts by mass of a slightly cationic polymer exceeding / g and not exceeding 3.0 meq / g with respect to 100 parts by mass of the white pigment.

  In the method for producing an inkjet recording paper according to the present invention, the alkali component is preferably an alkali metal hydroxide or ammonia water. Better ink drying properties can be obtained during printing.

  In the ink jet recording paper manufacturing method according to the present invention, it is preferable that the base paper is not subjected to a size press process. Better ink drying properties can be obtained during ink jet printing.

  In the method for producing an inkjet recording paper according to the present invention, the ink receiving layer coating material may contain kaolin and light calcium carbonate as the white pigment, and the kaolin content may be greater than the light calcium carbonate content. preferable. The generation of white stripes can be further suppressed while the drying property is good.

  According to the present disclosure, it is possible to provide a relatively inexpensive inkjet recording paper manufacturing method that has a texture equivalent to that of general printing paper, has good ink drying properties, and has no noticeable white streaks in the solid printing portion. it can.

  Next, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.

  An ink jet recording paper manufacturing method according to this embodiment includes a step of applying an ink receiving layer coating material containing a white pigment other than silica and a styrene-butadiene resin on at least one surface of a base paper. In the production method, the coating material for an ink receiving layer contains an alkali component in an amount of 0.01 to 0.15 parts by mass with respect to 100 parts by mass of a white pigment, and the degree of cationization exceeds 0 meq / g to 3.0 meq / g or less of a slightly cationic polymer is contained in an amount of 0.01 to 3.00 parts by mass with respect to 100 parts by mass of the white pigment.

(1) Base paper In the inkjet recording paper manufacturing method according to the present embodiment, as pulp used for the base paper, chemical pulp such as LBKP (hardwood bleached kraft pulp) or NBKP (softwood bleached kraft pulp), GP (crushed wood) Pulp), PGW (Pressurized groundwood pulp), RMP (Refiner mechanical pulp), TMP (Thermomechanical pulp), CTMP (Chemithermomechanical pulp), CMP (Chemical mechanical pulp) or CGP (Chemical pulp) It is possible to use wood pulp such as DIP (deinked pulp) or non-wood pulp such as kenaf, bagasse, bamboo or cotton. These can be used alone or in admixture at any ratio. In addition, a synthetic fiber can be further blended within a range that does not impair the intended effect of the present invention. From the viewpoint of environmental conservation, it is more preferable to use ECF (Elemental Chlorine Free) pulp, TCF (Total Chlorine Free) pulp, waste paper pulp or pulp obtained from planted trees.

  As the filler used for the base paper, for example, light calcium carbonate, heavy calcium carbonate, talc, clay, kaolin, calcined clay, titanium dioxide, or aluminum hydroxide can be used. The filler content in the base paper is preferably 2 to 30 parts by mass with respect to 100 parts by mass of the dry mass of the pulp. More preferably, it is 3-17 mass parts. More preferably, it is 4-15 mass parts. If it is less than 2 parts by mass, effects such as whiteness improvement and opacity improvement may not be obtained. If it exceeds 30 parts by mass, the strength of the base paper itself may be insufficient, and it may not be able to withstand printing and processing and may not be used.

  For the base paper, in addition to pulp and filler, internal paper strength enhancers such as internal sizing agents and wet paper strength enhancers, bulking agents, yield improvers, drainage improvers, colored dyes, color pigments, fluorescent enhancers Various auxiliary agents such as a whitening agent, a fluorescence decoloring agent, or a pitch control agent can be appropriately blended. Various known sizing agents can be used, and are not particularly limited. For example, reinforced rosin sizing agent, acidic rosin sizing agent, weak acidic rosin sizing agent, AKD (alkyl ketene dimer), ASA (alkenyl succinic anhydride) ). As the internal paper strength enhancer, a conventionally known paper strength enhancer can be used, for example, starch based paper strength enhancer, polyacrylamide based paper strength enhancer or polyvinyl alcohol based paper strength enhancer. is there.

  The method of making the base paper is not particularly limited, and is a long net paper machine, a long net multi-layer paper machine, a circular net paper machine, a circular net multi-layer paper machine, a long net circular net combination multi-layer paper machine, or a twin wire paper machine. It can be manufactured by various devices such as a machine.

The base paper may be subjected to a size press process. Examples of the surface sizing liquid used in the size press treatment include, but are not particularly limited to, an aqueous solution containing a known water-soluble polymer such as starch, polyvinyl alcohol, or polyacrylamide. When the size paper is subjected to a size press treatment, the application amount of the size liquid is preferably 40 g / m ² or less (by wet), more preferably 30 g / m ² or less. In the present embodiment, it is preferable that the base paper is not subjected to size press treatment from the viewpoint of ink drying. Although the basic weight of a base paper is not specifically limited, Usually, it is 30-300 g / m < ² >. More preferably 50 to 250 g / ^{m 2.}

  Even if an under layer provided by applying a coating liquid mainly composed of a pigment and a binder was applied to one side or both sides of the base paper obtained by the above method, this under layer was applied. The later coated paper can be used as a base paper in the inkjet recording paper manufacturing method according to the present embodiment.

(2) Ink Receptive Layer In the ink jet recording paper manufacturing method according to this embodiment, ink is applied by applying a coating for an ink receptive layer mainly composed of a white pigment other than silica and a binder on at least one side of a base paper. A receiving layer is provided. Examples of the white pigment to be contained in the ink receiving layer include known pigments generally used in coated paper for printing. The white pigment is, for example, an inorganic pigment such as light calcium carbonate, heavy calcium carbonate, kaolin, calcined kaolin, zinc oxide, titanium oxide or aluminum hydroxide, or organic polymer fine particles such as plastic pigment. One or more kinds can be appropriately selected and used according to the purpose. However, in this embodiment, silica is not used as the white pigment because the texture of the general printing coated paper is impaired. Silica is, for example, synthetic silica such as colloidal silica, precipitated silica, gel silica, or vapor phase silica. The white pigment in the ink receiving layer is preferably light calcium carbonate, kaolin, or a mixture thereof. For example, it is preferable to use kaolin and light calcium carbonate as a white pigment so that the kaolin is more than light calcium carbonate in a mass ratio of 51:49 to 95: 5. Excellent dryness and no white streaking. More preferably, it is 55: 45-85: 15.

  As the binder used for the ink receiving layer, a styrene-butadiene resin is contained. By containing a styrene-butadiene resin as a binder for the ink receiving layer, the strength of the ink receiving layer can be improved, and the strength can be equal to that of conventional coated paper for general printing, and is inexpensive. Therefore, the manufacturing cost can be kept low.

  In the ink receiving layer, a binder other than the styrene-butadiene resin may be further used. The binder other than the styrene-butadiene resin is not particularly limited. For example, starch such as oxidized starch, enzyme-modified starch, esterified starch, etherified starch, cationic starch or amphoteric starch, gelatin, casein, soybean Examples thereof include water-soluble polymers such as protein or polyvinyl alcohol, or synthetic resins such as vinyl acetate resin, ethylene vinyl acetate resin, polyurethane resin, acrylic resin, polyester resin, and polyamide resin. One or more of these can be appropriately selected from these according to the purpose.

  The content of the binder in the ink receiving layer is not particularly limited, but is preferably 3 to 50 parts by weight, more preferably 5 to 40 parts by weight with respect to 100 parts by weight of the total white pigment in the ink receiving layer. 5 to 20 parts by mass is more preferable. If the content is less than 3 parts by mass, the ink-receiving layer may drop off, and if it exceeds 50 parts by mass, the ink absorbability deteriorates and ink drying may occur.

  In the present embodiment, the ink-receiving layer coating material contains a slightly cationic polymer. In the present invention, the slightly cationic polymer refers to a polymer having a degree of cationization of more than 0 meq / g and 3.0 meq or less. The degree of cationization is more preferably 0.10 to 2.50 meq / g. The slightly cationic polymer has an effect of appropriately increasing the pore volume of the ink receiving layer and improving the ink absorbency while keeping the ink dot spread moderately. When the degree of cationization exceeds 3.0 meq / g, the strength of the ink receiving layer is inferior. Further, it tends to agglomerate with the white pigment contained in the ink-receiving layer coating material, and aggregates are generated due to increase in viscosity and stability of the coating material, and there is a possibility that good coating suitability cannot be obtained. In addition, a cationic polymer which is a so-called fixing agent for inkjet ink has a high degree of cationization, and usually exceeds 3.0 meq / g, for example, 5.0 meq / g or more. It is distinguished from the slightly cationic polymer used in this embodiment. Since the fixing agent for inkjet ink has a high degree of cationization, it aggregates with a white pigment when added to the ink receiving layer coating. As a result, the paint aggregates and the fluidity decreases, resulting in a liquid property unsuitable for coating (coating unevenness is likely to occur). The degree of cationization can be measured by a colloid titration method.

  The content of the slightly cationic polymer in the ink-receiving layer coating is 0.01 to 3.00 parts by weight, preferably 0.000, based on 100 parts by weight of the total white pigment in the ink-receiving layer coating. 10 to 2.50 parts by mass. When the amount is less than 0.01 parts by mass, the ink absorptivity is poor. When it exceeds 3.00 parts by mass, the strength of the ink receiving layer is inferior. In addition, agglomerates are generated due to the thickening of the paint or a decrease in stability, and there is a possibility that good coating suitability cannot be obtained.

  Examples of the slightly cationic polymer include polyethyleneimine, epichlorohydrin-modified polyalkylamine, polyamine, polyamine polyamide epichlorohydrin, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, Polyvinylpyridium halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethylammonium chloride polymer, diallyldimethylammonium chloride sulfur dioxide copolymer, diallyldimethylammonium chloride amide copolymer, dicyandiamide formalin polycondensate, dicyandiamide Diethylenetriamine polycondensate, Reallylamine, polydiallylamine, polyallylamine hydrochloride, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cationic modified polyvinyl alcohol, amino acid type amphoteric surfactant, betaine type compound, polyamidine compound, modified polyamine Among the resins, modified polyamide resins, other quaternary ammonium salts, and cationic modified polyurethane resins, these are slightly cationic. These may be used alone or in combination of two or more.

  Further, the slightly cationic polymer has a function of improving the ink absorbability of the ink receiving layer by increasing the pore volume of the ink receiving layer by an appropriate aggregating action with the styrene-butadiene resin latex. That is, by including a slightly cationic polymer in the ink receiving layer, the pore volume of the coating layer is appropriately increased in the drying step of the ink receiving layer, and the ink absorbability is improved. By using a slightly cationic polymer, even when a styrene-butadiene resin latex is used as a binder, the coating liquid for the ink receiving layer does not excessively aggregate, and the coating layer strength is excellent. It can be an ink receiving layer.

  In this embodiment, an alkali component is contained in the ink receiving layer coating material. The alkali component is a compound that exhibits alkalinity (pH is greater than 8) in water, and is, for example, an alkali metal hydroxide, an alkaline earth metal hydroxide, or ammonia water.

  The content of the alkali component used in the ink receiving layer is 0.01 to 0.15 parts by mass as a pure component with respect to 100 parts by mass of the all white pigment in the ink receiving layer coating. More preferably, it is 0.02-0.10 mass part. By including an alkali component in the ink-receiving layer coating, the void on the outermost surface of the ink-receiving layer is appropriately reduced, and the ink dots are likely to spread on the outermost surface, and solid white stripes can be suppressed. Infer. When the content of the alkali component is less than 0.01 parts by mass, the ink does not spread appropriately during printing, and white stripes are generated in the solid printing part, and good print quality cannot be obtained. When the content of the alkali component exceeds 0.15 parts by mass, the ink absorbability deteriorates, resulting in poor ink drying. As described above, according to the present invention, it is possible to easily achieve both ink dryness and solid white line suppression by appropriately adjusting the blending amount of the slightly cationic resin and the blending amount of the alkali component. It becomes.

  The alkali component used in the ink receiving layer is preferably an alkali metal hydroxide or aqueous ammonia. Examples of the alkali metal hydroxide include lithium hydroxide, sodium hydroxide and potassium hydroxide. From these, it can select suitably according to the objective and can be used. The concentration of the ammonia water is preferably 5 to 40% by mass, and more preferably 10 to 30% by mass.

  The ink-receiving layer may contain various auxiliary agents as necessary, for example, viscosity modifiers, softeners, gloss imparting agents, dispersants, flow modifiers, ultraviolet absorbers, fluorescent brighteners, colorants, antifoaming agents. An agent, a plasticizer, and a preservative are appropriately blended as necessary.

(3) Coating system The ink jet recording paper manufacturing method according to the present embodiment includes, for example, a white pigment excluding silica as a pigment and a binder, and an ink receiving containing an alkali component and a slightly cationic polymer. A step of coating and drying the layer coating on the surface of the base paper; In the ink jet recording sheet manufacturing method according to the present embodiment, the coating method of the ink receiving layer coating is not particularly limited, and a commonly used coating apparatus can be used. Coating equipment includes, for example, air knife coaters, blade coaters, gravure coaters, rod blade coaters, roll coaters, reverse roll coaters, bar coaters, curtain coaters, die slot coaters, Champlex coaters, metering blade type size press coaters Various known coating apparatuses such as a short dwell coater, a spray coater, a gate roll coater, or a lip coater can be used.

The coating amount of the ink receiving layer coating material when forming the ink receiving layer is not particularly limited, but it is preferably ² to 40 g / m ^{2 in} terms of solid content per one side of the base paper. More preferably, it is 5-30 g / m < ² >, More preferably, it is 8-20 g / m < ² >. If the coating amount is less than 2 g / m ² , it may be difficult to obtain a desired ink drying property. If it exceeds 40 g / m ² , it may be disadvantageous in terms of cost.

(4) Calendar process The inkjet recording paper according to the present embodiment can be given a gloss by performing a calendar process in the same manner as a general coated paper for printing. It is preferable to perform a calendering treatment after applying the ink receiving layer coating solution on the base paper and drying it. As the calendar processing apparatus, a normal super calender, gloss calender, shoe nip calender or soft calender is used. The processing conditions such as the pressurizer configuration, the number of pressurization nips, or the temperature conditions during the calendar process can be appropriately adjusted and processed.

  Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In the examples, “parts” and “%” represent “parts by mass” and “mass%”, respectively, unless otherwise specified. The number of added parts is a value in terms of solid content.

Example 1
(Preparation of base paper)
Canadian Standard Freeness 450ml csf hardwood bleached kraft pulp 100 parts, light calcium carbonate (TP-121: manufactured by Okutama Kogyo Co., Ltd.) 10 parts, cationized starch (Neotac 30T: manufactured by Nippon Food Processing Co., Ltd.), and neutral rosin Water was added to 0.2 parts of size (CC167: manufactured by Seiko PMC Co., Ltd.) to prepare a paper stock, and a base paper was prepared using this using a long mesh multi-cylinder paper machine. The base paper was not subjected to size press treatment.

(Preparation of paint for ink receiving layer)
As a white pigment, it was added to 70 parts of kaolin (Contour 1500, manufactured by Imeris Co., Ltd.) and 30 parts of light calcium carbonate (TP-123CS, manufactured by Okutama Kogyo Co., Ltd.) and dispersed in water using a Coreless disperser to prepare a pigment slurry . To this pigment slurry, 7.5 parts of styrene butadiene latex (PA0372, manufactured by Nippon A & L Co.) as a binder and 3.5 parts of phosphate esterified starch (MS4600, manufactured by Nippon Food Processing Co., Ltd.), modified as a slightly cationic polymer Polyamine-based resin (trade name: Sumirez Resin SPI-102A, cationization degree 1.9 meq / g, manufactured by Taoka Chemical Co., Ltd.) 1.0 part, and sodium hydroxide (manufactured by Shin-Etsu Chemical Co., Ltd.) 0.05 part as an alkali component Were added to prepare an ink receiving layer coating material.

(Preparation of inkjet recording paper)
The ink-receiving layer coating material was applied to both sides of the base paper obtained above using a blade coater and dried so that the dry coating amount per side was 10 g / m ² . Then, a calendar process was performed and the inkjet recording paper was produced.

(Example 2)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of alkali component added was 0.01 parts in Example 1.

(Example 3)
An ink jet recording paper was prepared in the same manner as in Example 1 except that the amount of the alkali component added was 0.15 part in Example 1.

Example 4
An ink jet recording paper was prepared in the same manner as in Example 1 except that potassium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.) was used as the alkali component in Example 1.

(Example 5)
An ink jet recording paper was prepared in the same manner as in Example 1 except that the alkaline component was 25% ammonia water (manufactured by Mitsubishi Gas Chemical Company). The number of added parts is the number of parts of pure ammonia.

(Example 6)
An ink jet recording paper was prepared in the same manner as in Example 1 except that calcium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.) was used as the alkali component in Example 1.

(Example 7)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of kaolin added to the ink-receiving layer coating material was 95 parts and the amount of light calcium carbonate added was 5 parts.

(Example 8)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of kaolin added to the ink receiving layer coating material was 55 parts and the amount of light calcium carbonate added was 45 parts.

Example 9
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of kaolin added to the ink-receiving layer coating material was 85 parts and the amount of light calcium carbonate added was 15 parts.

(Example 10)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of kaolin added to the ink-receiving layer coating material was 50 parts and the amount of light calcium carbonate added was 50 parts.

(Example 11)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of kaolin added to the ink-receiving layer coating material was 40 parts and the amount of light calcium carbonate added was 60 parts.

(Example 12)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of the slightly cationic polymer added in Example 1 was changed to 0.05 part.

(Example 13)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the addition amount of the slightly cationic polymer was changed to 3.0 parts in Example 1.

(Example 14)
Inkjet recording was carried out in the same manner as in Example 1 except that the slightly cationic polymer was changed to a modified polyamine resin (trade name: PA629, cationization degree 0.05 meq / g, manufactured by Seiko PMC). A paper was prepared.

(Example 15)
In Example 1, except that the slightly cationic polymer was changed to a modified polyamide resin (trade name: Sumirez Resin SPI-203 (50) H, cationization degree 3.0 meq / g, manufactured by Taoka Chemical Co., Ltd.) Inkjet printing paper was prepared in the same manner as in Example 1.

(Comparative Example 1)
An ink jet recording paper was prepared in the same manner as in Example 1 except that the alkali component was not added in Example 1.

(Comparative Example 2)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the slightly cationic polymer was not added.

(Comparative Example 3)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the alkali component and the slightly cationic polymer were not added.

(Comparative Example 4)
Inkjet recording paper was prepared in the same manner as in Example 1 except that the amount of alkali component added was 0.3 parts in Example 1.

  The obtained inkjet recording paper was evaluated by the following method. The obtained results are shown in Tables 1 and 2.

Ink drying evaluation (drying)
Using an industrial inkjet printer (model: TruepressJet 520, manufactured by SCREEN Holdings), a solid black solid print was printed on an inkjet recording paper with an aqueous pigment ink at 128 m / min. After printing, the black solid color printing portion was visually confirmed and evaluated in four stages. 4. The ink with the least ink rub-off and the best drying property is 4, the ink rub-off is the most dry and the one with the worst drying property is 1. Was rejected.
4: Practicable without rubbing off.
3: Slight rub-off is seen but practical.
2: Slightly rubs off, but can be put to practical use if the pattern is lightly printed.
1: There are many rubbing off and impractical.

Solid print section white stripe evaluation (white stripe)
Using an industrial inkjet printer (model: TruepressJet 520, manufactured by SCREEN Holdings), a solid black solid print was printed on an inkjet recording paper with an aqueous pigment ink at 128 m / min. After printing, the black solid color printing portion was visually confirmed and evaluated in four stages. The white streaks that were most not seen were set to 4, the white streaks were found to be the worst, and 1 were evaluated, the evaluations of 2 to 4 were accepted, and the evaluation of 1 was rejected.
4: Can be used without white streaking.
3: Slight white streaks are seen but practical.
2: Some white streaks are seen, but a lightly printed pattern can be used.
1: Many white streaks are seen and impractical.

  As is clear from Tables 1 and 2, in Examples 1 to 15, the solid print portion white streaks were not noticeable and the ink drying property was good as compared with Comparative Examples 1 to 4.

  Since Comparative Examples 1-3 did not add both a slightly cationic polymer and an alkali component, the ink drying property and the solid print portion white stripe evaluation were inferior. Comparative Example 4 was inferior in ink drying because the amount of alkali component added was too large.

  The ink jet recording paper obtained by the manufacturing method of the present disclosure is suitable as a paper for an on-demand printing ink jet printer.

Claims (4)

In the method for producing an ink jet recording paper, comprising at least one side of a base paper, a step of applying a paint for an ink receiving layer containing a white pigment other than silica and a styrene-butadiene resin,
The ink-receiving layer paint contains 0.01 to 0.15 parts by mass of an alkali component with respect to 100 parts by mass of the white pigment, and has a cationization degree of more than 0 meq / g and 3.0 meq / g or less. A method for producing an inkjet recording paper, comprising 0.01 to 3.00 parts by mass of a slightly cationic polymer with respect to 100 parts by mass of the white pigment.   2. The method for producing an inkjet recording paper according to claim 1, wherein the alkali component is an alkali metal hydroxide or ammonia water.   3. The method of manufacturing an ink jet recording paper according to claim 1, wherein the base paper is not subjected to a size press process.   4. The ink receiving layer coating composition according to claim 1, wherein the white pigment contains kaolin and light calcium carbonate as the white pigment, and the kaolin content is higher than the light calcium carbonate content. The manufacturing method of the inkjet recording paper as described in one.