JP2008007899A - Information recording paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide information recording paper having pearly glitter, suitable for ink-jet printing and having a feeling like paper, excellent glitter and good printing quality. <P>SOLUTION: The information recording paper has a coating layer prepared by coating at least one surface of base paper consisting essentially of fibrous pulp and a filler with a coating liquid containing microfibrous cellulose, a hydrophilic resin and a pearlescent pigment. Thereby, the paper has a mat feeling as the whole paper, the excellent glitter, good color developing properties without ink bleeding, excellent printing characteristics and the good printing quality and achieves high printing suitability. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information recording paper having a pearly luster and suitable for ink jet printing.

  Paper having a pearly luster has been used for cosmetic packaging and the like because it has a high-class feel and high cosmetics. The pearly luster includes properties such as pearly glittering properties, glare, faintness, glitter, or shine.

As the paper having glitter, there is a paper using a pearl pigment, flake glass or the like (for example, see Patent Document 1).
JP 2001-329492 A (paragraph [0007])

  The paper having the pearly glitter as described above is for offset printing, and when inkjet printing is performed, there is a problem that the glitter of the printed portion is impaired. In addition, there is a problem in that color developability is poor, ink bleeding occurs, and printability is poor.

  In the case where a transparent ink jet receiving layer is coated on a base material having a pearly luster, there is a problem that the glitter of the printed portion is greatly reduced. Further, the surface is glossy, does not have a matte feeling, and does not have a texture like paper.

  Ink-jet paper obtained by blending pearl pigments into inkjet paints composed mainly of general inorganic pigments, and coating and drying the pearl pigments in the coating film with sufficient coating quality. Therefore, there is a problem that the bright part is not conspicuous, and it is difficult to obtain a sufficient bright feeling. Moreover, when a pearl pigment is mix | blended, there exists a problem that a printing quality falls.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide an information recording paper having a paper-like texture, excellent glossiness, and good print quality.

  As a result of diligent research in view of the above object, the inventors of the present invention contain fine fibrous cellulose, a hydrophilic resin and a pearl pigment on at least one side of a base paper mainly composed of fibrous pulp and filler in information recording paper. By having a coating layer formed by coating a coating liquid, it has been found that the paper as a whole has a matte feeling, has a good texture, has excellent glitter, and realizes high printability. did.

  Here, the “hydrophilic resin” includes a resin having affinity with the water-based ink. By containing a hydrophilic resin, it is possible to impart film strength and binding properties with a substrate without impairing print quality. In addition, “brightness” herein refers to a property that glitters in a matte tone.

  The fine fibrous cellulose is preferably bacterial cellulose.

  Further, the hydrophilic resin may be a polymer exhibiting a cationic property. In the case of a polymer exhibiting cationic properties, the water resistance of the dye is further improved. The hydrophilic resin may be an acrylic polymer, a vinyl polymer, an allyl polymer, or a mixture thereof.

  It is preferable that the pearl pigment is contained in the coating liquid in a proportion of 0.5 wt% to 50 wt%. Within such a range, pearl pigments sufficient to obtain a pearly luster are included, and the matte feeling is not deteriorated as a whole because it is not glossy. This is also preferable. More preferably, the pearl pigment is contained in the coating solution in a proportion of 3 wt% to 30 wt%. In such a range, the contrast between the bright part and the matte part is further improved. The paper as a whole further has a matte feel, is more excellent in glitter, and can achieve higher printability.

  In the present invention, simply “parts” means parts by weight. In addition, “%” simply means “% by weight”.

The coating liquid is preferably applied to the base paper with a coating amount of 1 g / m ² or more and 10 g / m ² or less. If it is less than this range, the amount of pearl pigment is small, so that the glitter is slightly low. On the other hand, when the amount is larger than the above range, the glitter is slightly lowered, and further problems such as curling may occur.

  Further, the pearl pigment may contain at least mica. Thereby, more excellent pearly luster can be provided.

  According to the present invention, it has a paper-like texture, is excellent in glitter, and has good print quality.

  Hereinafter, the information recording sheet of the present invention will be described in detail.

  The information recording paper of the present invention is prepared using the following base paper and the following coating liquid.

(1. Base paper)
The base paper used in the present invention is mainly made of chemical pulp and filler typified by LBKP, NBKP and the like, and in addition, paper is made by a conventional method using an internal sizing agent and paper making aid as required. As the pulp material to be used, mechanical pulp or recycled paper recycled pulp may be used in combination, or those mainly composed of these may be used. Examples of the filler include calcium carbonate, kaolin, talc, and titanium dioxide.

(2. Coating liquid)
The coating liquid of the present invention contains fine fibrous cellulose, a hydrophilic resin, and a pearl pigment. The fine fibrous cellulose forms a fine network structure in the paint, and has an effect of incorporating a pearl pigment into this network and stabilizing the dispersion. Further, even when fine fibrous cellulose settles, the pearl pigment is incorporated into the network structure, and functions to prevent aggregation of the pearl pigments and facilitate redispersion. By containing the hydrophilic resin, the dispersibility of the fine fibrous cellulose by the disaggregation operation is improved, and further, the film strength is improved because it functions as a binder. By making the hydrophilic resin into a cationic polymer, the water resistance of the pigment can be improved.

(2. (1) Fine fibrous cellulose)
The fine fibrous cellulose referred to in the present invention refers to fibrous cellulose having an average fiber width of 10 μm or less. Among plant-derived ones, there are pulps that have been microfibrillated by applying a strong mechanical shearing force to the pulp using an ultra-high pressure homogenizer or the like (for example, JP-A-2000-17592). The average fiber width of the plant-derived fine fibrous cellulose is preferably 0.01 to 0.1 μm. As a commercial item of plant origin fine fibrous cellulose, "Serisch" (made by Daicel Chemical Industries Ltd.) is mentioned.

  Other fine fibrous cellulose includes bacterial cellulose. Bacterial cellulose generally consists of ribbon-like microfibrils (small fibers) having a thickness of 1 to 20 nm and a width of 10 to 50 nm. What is obtained by microbial culture is a gel, and its water content is 95% by weight or more. One type of bacterial cellulose may be used, or a plurality of types of bacterial cellulose may be combined.

  Bacterial cellulose includes cellulose and cellulose-containing heteropolysaccharide and β-1,3, β-1,2 and other glucans. Constituent components other than cellulose in the case of heteropolysaccharides are hexoses such as mannose, fructose, galactose, xylose, arabinose, rhamnose, glucuronic acid, pentoses, and organic acids. In addition, these polysaccharides may be a single substance, or two or more kinds of polysaccharides may be mixed by hydrogen bonding or the like.

  Any bacterial cellulose can be used as long as it is as described above.

  Microorganisms that produce such bacterial cellulose are not particularly limited, but include Acetobacteraceti subsps / xylinum ATCC 10821 or A. pasteurianus, A. rancens, Those that produce bacterial cellulose, such as Sarcina ventriculi, Bacterium xyloides, Pseudomonas bacteria, Agrobacterium bacteria, and the like, can be used.

  A method of culturing these microorganisms to produce and accumulate bacterial cellulose may be in accordance with a general culture method. That is, a microorganism is inoculated in a normal nutrient medium containing a carbon source, a nitrogen source, inorganic salts, and other organic micronutrients such as amino acids and vitamins as necessary, and the mixture is left standing or gently aerated and stirred. As the carbon source, glucose, sucrose, maltose, starch hydrolyzate, sugar cane and the like are used, but ethanol, acetic acid, citric acid and the like can be used alone or in combination with the above sugars. As the nitrogen source, organic or inorganic nitrogen sources such as ammonium salts such as ammonium sulfate, ammonium chloride, and ammonium phosphate, nitrates, urea, and peptone are used. As the inorganic salts, phosphates, magnesium salts, calcium salts, iron salts, manganese salts and the like are used. Organic micronutrients include amino acids, vitamins, fatty acids, nucleic acids, and peptone, casamino acids, yeast extracts, soy protein hydrolysates that contain these nutrients, and auxotrophic mutations that require amino acids for growth. When using a strain, it is necessary to further supplement the required nutrients.

The culture condition may be a conventional method, and static culture or aeration and agitation culture is performed for 1 to 30 days while controlling pH at 5 to 9 and temperature at 20 to 37 ° C. In the case of static culture, bacterial cellulose accumulates in a mat or gel on the culture surface. On the other hand, in the case of aeration and agitation culture, bacterial cellulose is produced by dispersing in a culture solution in the form of lumps of various sizes. The bacterial cellulose obtained here is usually composed of microfibrils having a thickness of 1 to 20 nm and a width of 10 to 50 nm (Japanese Patent Laid-Open No. 62-36467, US Pat. No. 4,863,565, etc.), but chloram in the medium. By adding a cell division inhibitor such as phenicol or nardicic acid, it is possible to produce bacterial cellulose filaments having the same thickness but extending to about 1000 nm (US patent application 09 / 436,756). ). Further, when an organic reducing agent such as dithiothreitol is added to the medium, a bacterial cellulose fibrous material having a short width can be obtained.

  The bacterial cellulose used in the present invention may contain impurities to some extent depending on the use, in addition to a purified product isolated from a culture of microorganisms. For example, residual sugar, salts, yeast extract, etc. in the culture solution may remain in the microbial cellulose. Moreover, the microbial cell may be contained to some extent.

  When bacterial cellulose is isolated, it is removed from the culture and washed with water. Chemicals such as bactericides and pretreatment agents may be added to the washing water depending on the purpose. After washing with water, it is dried, or kneaded with other kneaded materials and then dried. There is no limitation on the drying method as long as it is carried out in a temperature range where cellulose does not decompose. However, the drying method is not limited as long as it is performed in a temperature range in which bacterial cellulose does not decompose. However, bacterial cellulose is composed of fine fibers having a large number of hydroxyl groups on the surface, and the fibers may stick together during drying, resulting in loss of fiber form. Therefore, freeze drying and critical point drying are preferred drying methods. .

  In order to prevent mutual adhesion of bacterial cellulose fibers during coating coating drying, gelled bacterial cellulose is finely disaggregated (pulverized) in a poor solvent for alcoholic bacteria cellulose to form a slurry, or dried to a powder form It is preferable to do this. The method of disaggregating bacterial cellulose is not particularly limited. For example, a method of rotating at high speed in water using a homogenizer as described in JP-A-5-51885, or acid hydrolysis as described in JP-B-5-80484. After the treatment, a mechanical shearing method or the like can be used. If necessary, a technique of freeze pulverization as described in JP-A No. 2003-11494 or pulverization with a high-pressure emulsifier may be used.

(2. (2) Hydrophilic resin)
Examples of the hydrophilic resin that can be used in the present invention include acrylic polymers, vinyl polymers, and allyl polymers. By containing the hydrophilic resin, the dispersibility of the fine fibrous cellulose by the disaggregation operation is improved, and further, the film strength is improved because it functions as a binder. The hydrophilic resin can be a cationic polymer. Here, the “cationic polymer” includes a hydrophilic resin having a structural unit containing a cationic group.

  The cationic polymer is a component that contributes to the fixing property and coloring property of the ink. As the color material contained in the ink penetrates into the inside of the recording paper, it associates with the cationic polymer near the surface of the recording paper by ionic interaction and instantaneously separates from the solution phase. And color development can be further improved. The cationic group is not particularly limited as long as it has an affinity for ink for inkjet printers. Particularly preferred cationic polymers are those having a quaternary ammonium salt as the cationic group.

  The hydrophilic resin may be (i) a structural unit having a quaternary ammonium salt and / or (ii) a structural unit derived from a hydrophilic acrylic monomer, vinyl monomer or allyl monomer, and / or (iii). It is obtained by including a structural unit derived from a hydrophobic monomer. Hereinafter, the structural units (i) to (iii) will be described in detail.

(2. (2) (i) Structural unit having a quaternary ammonium salt)
The structural unit (i) is a segment that contributes to fixing of the dye. Here, the “quaternary ammonium salt” is represented by the following general formula (1). However, in the following general formula (1), R1 to R5 are groups composed of an alkyl group having 1 to 7 carbon atoms, an aryl group, a benzyl group, or a combination thereof, and these groups may be the same or different. X ⁻ is a counter ion such as a halogen group.

  A quaternary ammonium salt is obtained by adding an alkyl halide or the like to an alkylamino group. Specific examples of the monomer for deriving the structural unit (i) include N, N-dimethylaminoethyl (meth) acrylate / methyl chloride quaternized product, N, N-dimethylaminopropyl (meth) acrylamide / methyl chloride tetra Preferred are graded products, N, N-diallylmethylamine / methyl chloride quaternized products, and the like.

(2. (2) (ii) Structural unit derived from hydrophilic acrylic monomer, vinyl monomer or allyl monomer)
The structural unit (ii) is a segment having a function of quickly absorbing water and a dye dissolved or suspended therein. Specific examples of monomers include: 1. aliphatic carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, maleic anhydride, fumaric anhydride, itaconic anhydride, or anhydrides thereof; (Meth) acrylamide, dimethyl (meth) acrylamide, diethyl (meth) acrylamide, (meth) acryloylmorpholine, N, N-dimethylaminopropyl (meth) acrylamide, N, N-diethylaminopropyl (meth) acrylamide, (meth) acrylamide 2. acrylamides such as t-butyl sulfonic acid; 3. Phosphoric acid group-containing acrylic monomers such as mono (2-methacryloyloxyethyl) acid phosphate and mono (2-acryloyloxyethyl) acid phosphate; Vinylpyrrolidones such as N-vinyl-2-pyrrolidone are preferred.

(2. (2) (iii) Structural unit derived from hydrophobic monomer)
The structural unit (iii) is a segment that imparts water resistance to the hydrophilic resin, and can be contained in a range that does not significantly impair the hydrophilicity. The structural unit (iii) is not particularly limited as long as it is a monomer having no hydrophilic group. Moreover, even if it is a monomer which has hydrophilic groups (-OH etc.) or a hydrophilic part (-O- etc.), if it is a monomer which has a C4 or more hydrophobic group, a hydrophobic part will be in a copolymer. Can be formed. Such a hydrophobic group preferably has 6 or more carbon atoms. Examples of the hydrophobic group include a long chain alkyl group, a long chain alkylene group, and an aromatic group.

(2. (2) (iv) Ratio of each structural unit)
The blending ratio of the structural units (i) to (iii) of the hydrophilic resin is such that (i) is 0 to 100% by weight, (ii) is 0 to 100% by weight, and (iii) is 0 to 30%. It is preferable that it is weight%.

(2. (3) Pearl pigment)
The pearl pigment includes natural pearl pigments that give pearly luster and synthetic pearl pigments, and includes, for example, mica, basic carbonates, titanium oxide, zirconia, and mixtures thereof. Pearl pigments are generally lamellar. Mica includes, in addition to natural mica, synthetic mica coated with, for example, titanium dioxide or iron oxide, and modified products thereof. As the synthetic mica, for example, an aluminum oxide, magnesium oxide, silicon dioxide, fluorine compound or the like mixed and processed and coated with a metal oxide can be given. Further, fish scale foil, natural pearl essence, bismuth oxychloride and the like may be used as the pearl pigment.

  The particle size distribution of the pearl pigment may be in a range that can be used for production of general information recording paper. In order to obtain excellent pearly luster, the particle size distribution is preferably 5 to 1000 μm or less, and more preferably 10 to 600 μm or less.

(2. (4) Composition of coating liquid)
The composition ratio of the coating liquid of the present invention is set to be fine fibrous cellulose: hydrophilic resin = 1: 0.1 to 50 (weight ratio). Preferably, it is fine fibrous cellulose: hydrophilic resin = 1: 0.5 to 15 (weight ratio). Add pearl pigment to this. Preferably, the pearl pigment is adjusted so as to be contained in the coating liquid at a ratio of 0.5 to 50% by weight. More preferably, it adjusts so that it may contain in the ratio of 3 weight%-30 weight% in a coating liquid. If the ratio of the pearl pigment is too small, it is difficult to obtain sufficient pearly luster, and if it is too large, the matte feeling will be impaired and the overall gloss will be lost. There is a risk of being.

  The solvent of the coating solution preferably contains a poor solvent for bacterial cellulose such as alcohol. Thereby, after applying a coating material to a base material, the sticking between the fine fibers at the time of drying can be suppressed, and the printability is improved by the network structure.

  A preferable concentration of the coating material is 0.1 to 30% by weight, particularly preferably 1 to 15% by weight, based on the dry weight of the solid.

(2. (5) Other components of coating solution)
Components other than fine fibrous cellulose, hydrophilic resin, and pearl pigment can be added to the coating liquid of the present invention as necessary within a range that does not significantly impair the effects of the present invention. Examples of other components include additives such as alumina powder, silica powder, natural inorganic powder, organic fine particles, resin emulsion, surfactant, pH adjuster, preservative, and antioxidant.

  Surfactants used include higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, higher alkylamine ethylene oxide adducts, fatty acid amide ethylene oxide adducts. , Fatty acid ethylene oxide adduct, polypropylene glycol ethylene oxide adduct, fatty acid ester of glycerol, fatty acid ester of pentaerythritol, fatty acid ester of sorbitol and sorbitan, fatty acid ester of sucrose, alkyl ether of polyhydric alcohol, alkanolamines Although fatty acid amide etc. are mentioned, it is not necessarily limited to these. By adding a surfactant, depending on the ink, the image density is increased and bleeding is improved.

(Information recording paper)
The information recording paper of the present invention is obtained by applying or impregnating the above coating liquid onto the surface of the above base paper. The coating may be only one side of the base paper or both sides. For example, the base paper is coated or impregnated with the coating liquid of the present invention in a solid content weight of 0.1 to 20 g / m ² , preferably 1 to 10 g / m ² . Further, a thin primer layer may be included between the base paper and the coating layer in order to improve the binding property.

  The information recording paper of the present invention is adjusted to have a water extraction pH of 5 to 9, more preferably 6 to 8. The water extraction pH is a value obtained by measuring the pH of an extract obtained by immersing about 1.0 g of a test piece defined in JISP-8133 in 70 ml of distilled water according to JIS-Z-8802.

  The information recording paper of the present invention does not significantly change the surface shape and physical characteristics other than the recording characteristics, compared with the conventional neutral PPC paper. Applicable to both.

(Function)
When printing on plain paper with an ink jet printer, the ink is blotted along the fiber of the paper, the dots are excessively blotted, the edges of the dots are jagged or blurred, so-called feathering occurs, and the print quality However, in the present invention, a fine network structure (network) of fine fibrous cellulose is formed on the surface of the base paper by coating, so that the occurrence of feathering can be suppressed. Generally, since the fiber width of hardwood pulp is about 30 μm, the effect of suppressing feathering is high when the fine fibrous cellulose has an average fiber width of 10 μm or less. Since bacterial cellulose is generally finer, the effect of suppressing feathering is even higher.

  In the present invention, since the pearl pigment remains in the network structure formed on the paper surface by the fine fibrous cellulose, the whole has a matte feeling like plain paper and has glitter.

  Paints containing fine fibrous cellulose show thixotropic flow behavior, and after coating on the base paper, it becomes a gel, and the pearl pigments are uniformly distributed without settling due to the fine fibrous cellulose network structure It is thought that it is dried in the state. Further, since the pearl pigment is in the form of a thin plate, it is considered that the light luminance increases when the pearl pigment is arranged in parallel to the film plane when the coating film thickness is thin. In addition, it is considered that the film made of fine fibrous cellulose, water-soluble resin and pearl pigment has a relatively low concealing property, so that the glitter of the pearl pigment in the film is hardly blocked and the glitter is high.

  The printed part does not lose its glitter due to the ink. This is considered because a fine network structure of fine fibrous cellulose absorbs a part of ink droplets placed on the pearl pigment.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely using an Example, this invention is not limited to these.

[Example 1]
<Synthesis of hydrophilic resin>
130 parts of N, N-dimethylacrylamide, 30 parts of Nt-octylacrylamide, N- [2- (N ′, N′-dimethylamino) ethyl] acrylate / methyl chloride quaternized product (78% aqueous solution) 51.3 Part, 389 parts of deionized water and 390 parts of methanol were charged into a reaction vessel, heated to 50 ° C. under a nitrogen stream, and 5 parts of 2,2′-azobis (2,4-dimethylvaleronitrile, 4% methanol solution). Was added. Then, it heated up to 60 degreeC and hold | maintained for 1.5 hours. Subsequently, 5 parts of 2,2′-azobis (2,4-dimethylvaleronitrile, 4% methanol solution) was added and the temperature was raised to 70 ° C. and kept for 2 hours to obtain a colorless and viscous resin.

  50 parts of bacterial cellulose (produced by aeration and agitation culture, solid content: 5.5% by weight), 138 parts of hydrophilic resin synthesized above, methacrylic acid crosslinked organic fine particles (product name “J-4P”, Negami Industrial Co., Ltd.) A mixture consisting of 2.75 parts, 150 parts of isopropyl alcohol and 52 parts of water was treated at 15000 rpm for 20 minutes using a homogenizer (High Flex Homogenizer HF93, SMT). Further, 412 parts of isopropyl alcohol was added, and the mixture was treated at 15000 rpm for 20 minutes using a homogenizer (High Flex Homogenizer HF93, SMT) to prepare a dispersion.

  11.9 g of pearl pigment made of synthetic mica coated with titanium dioxide (Ultimica SE-100, 15-100 μm, manufactured by Nihon Koken Kogyo Co., Ltd.) is added to the above dispersion (mixture of pearl pigment with respect to the total solid content of the paint) The ratio was 26.6% by weight) and stirring was performed to prepare a paint having a concentration of 5.5% by weight.

The coating basis weight 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) in approximately a bar coater 5.1 g / ^{m 2} (solids weight) at 140 ° C. in an oven Dried for 2 minutes.

[Example 2]
The coating material used in Example 1, basis weight of 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) in approximately a bar coater 6.1 g / ^{m 2} (solids weight) And dried in an oven at 140 ° C. for 2 minutes.

Example 3
The coating material used in Example 1, basis weight of 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) in approximately a bar coater 8.6 g / ^{m 2} (solids weight) And dried in an oven at 140 ° C. for 2 minutes.

Example 4
The coating material used in Example 1, basis weight of 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) in approximately a bar coater 9.2 g / ^{m 2} (solids weight) And dried in an oven at 140 ° C. for 2 minutes.

Example 5
8.6 g (all paint solid solids) of a pearl pigment made of synthetic mica coated with titanium dioxide (Ultimica SH-100, 150 to 600 μm, manufactured by Nippon Koken Kogyo Co., Ltd.) was added to the dispersion prepared in the same manner as in Example 1. The blending ratio of the pearl pigment to the minute was 20.7% by weight) and the mixture was stirred to prepare a paint having a concentration of 5.1% by weight.

It said paint having a basis weight of 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) to about 4.5 g / ^{m 2} by a bar coater (solids weight) at 140 ° C. in an oven Dried for 2 minutes.

Example 6
42.9 parts of fine fibrous cellulose (Serisch FD-200L, solid content 18.6% by weight, manufactured by Daicel Chemical Industries, Ltd.), 186 parts of hydrophilic resin synthesized in Example 1, methacrylic acid-based crosslinked organic fine particles (Product name “J-4P”, manufactured by Negami Kogyo Co., Ltd.) 26.57 parts and 143 parts of isopropyl alcohol were treated with a homogenizer (High Flex Homogenizer HF93, SMT Co., Ltd.) at 15000 rpm for 20 minutes. A dispersion was prepared.

  18.7 parts of pearl pigment (Ultimica SE-100, 15-100 μm, manufactured by Nippon Koken Kogyo Co., Ltd.) in the above dispersion (20.6% by weight of pearl pigment based on the total solid content of paint) and isopropyl alcohol 199 parts were stirred and mixed to prepare a paint having a concentration of 14.7% by weight.

The coating basis weight 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) in approximately a bar coater 8.7 g / ^{m 2} (solids weight) at 140 ° C. in an oven Dried for 2 minutes.

[Comparative Example 1]
100 parts of hydrophilic resin synthesized in Example 1, 2.0 parts of methacrylic acid-based crosslinked organic fine particles (product name “J-4P”, manufactured by Negami Industrial Co., Ltd.), pearl pigment (Ultimica SE-100, 15 to 15) 100 μm, made by Nippon Koken Kogyo Co., Ltd.) 8.67 parts (28.3% by weight of the pearl pigment based on the total solid content of the paint) and 196 parts of isopropyl alcohol were stirred and mixed to obtain a paint having a concentration of 10% by weight. Prepared.

The coating basis weight 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) in approximately a bar coater 5.8 g / ^{m 2} (solids weight) at 140 ° C. in an oven Dried for 2 minutes.

[Comparative Example 2]
The dispersion prepared as in Example 1 basis weight 209 g / ^{m 2} base paper so that the (OK Prince, Oji Paper Co., Ltd.) about the bar coater 5.1 g / ^{m 2} (solids weight) It was applied and dried in an oven at 140 ° C. for 2 minutes.

[Comparative Example 3]
100 parts of amorphous synthetic silica (AZ-6A0, manufactured by Tosoh Corporation), 10 parts of polyvinyl alcohol (PVA-117, manufactured by Kuraray Co., Ltd.) aqueous solution (solid content weight), ethylene-vinyl acetate emulsion (Sumikaflex 401HQ) Sumitomo Chemical Co., Ltd.) 40 parts (solid weight), cationic ink fixing agent aqueous solution (Unisense 101L, Senka Co., Ltd.) 20 parts (solid weight) and water, 21.0 weight % Dispersion was prepared.

  30.4 parts of pearl pigment (Ultimica SE-100, 15-100 μm, manufactured by Nippon Koken Kogyo Co., Ltd.) is added to 400 parts of the above dispersion (26.6% by weight of pearl pigment based on the total solid content of the paint) Water was added and stirred to prepare a paint having a concentration of 13.0% by weight.

It said paint having a basis weight of 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) to about 5.2 g / ^{m 2} by a bar coater (solids weight) at 140 ° C. in an oven Dried for 2 minutes.

[Comparative Example 4]
Comparing paint used in Example 3 having a basis weight of 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) about the bar coater 5.8 g / ^{m 2} (solids weight) Dry in an oven at 140 ° C. for 2 minutes.

[Comparative Example 5]
30.4 parts of pearl pigment (Ultimica SE-100, 15-100 μm, manufactured by Nihon Koken Kogyo Co., Ltd.) was added to 400 parts of the dispersion prepared in Comparative Example 3 (blending ratio of pearl pigment to the total solid content of the paint 26 6 wt%) and stirred to prepare a paint having a concentration of 26.6 wt%.

The coating basis weight 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) in approximately a bar coater 10.8 g / ^{m 2} (solids weight) at 140 ° C. in an oven Dried for 2 minutes.

[Comparative Example 6]
Comparing paint used in Example 5 having a basis weight of 209 g / ^{m 2} base paper was coated so as to (OK Prince, Oji Paper Co., Ltd.) about the bar coater 16.1 g / ^{m 2} (solids weight) Dry in an oven at 140 ° C. for 2 minutes.

[Comparative Example 7]
The base paper (OK Prince, manufactured by Oji Paper Co., Ltd.) having a basis weight of 209 g / m used in Examples and Comparative Examples was used as Comparative Example 7.

〔Experimental result〕
About the information recording paper of the said Examples 1-6 and Comparative Examples 1-6, the full color printing was performed using the inkjet printer ("PIXUS 950i", Canon Inc. make). The recorded image of the sample after printing was evaluated. Evaluation was performed according to the following criteria.

[Pearl brightness]
The non-printing part and the solid printing part (cyan (C), magenta (M), yellow (Y), black (K) and mixed colors) were visually evaluated.
◯: The bright part is brilliant and conspicuous.
(Triangle | delta): The glitter of a bright part is a little, and cosmetics are a little inferior.
X: The bright part is inconspicuous or the surface is inhomogeneous and the cosmetics are inferior. Or there is no mat feeling as the whole paper.

[Feathering]
Characters and fine lines with a font size of 4 points were printed with black ink and evaluated visually.
A: There is no bleeding in characters and fine lines, and there is no thickening of characters and fine lines.
○: Some blurring is observed in the characters and fine lines.
(Triangle | delta): Many blurs are observed in a character and a thin line, and a character and a thin line are thick.
X: Bleeding is severe in characters and fine lines, which is a practical problem.

[Ink absorbency]
The boundary of each color of the solid print portion and the degree of blurring of the characters were visually evaluated.
○: The boundary is clear, there is no blur, and the characters are clear.
(Triangle | delta): The blur has generate | occur | produced in the boundary and a character is also somewhat unclear.
X: The blurring of the boundary is severe and the character is difficult to read.

[Blocking resistance]
After printing, an untreated PET film was overlaid on the air-dried image, applied with a weight of about 50 g / m ² , allowed to stand at room temperature for 24 hours, and the adhesion state to the overlaid PET film was evaluated.
○: No blocking property △: Some blocking property ×: Blocking property

  Table 1 is a table showing experimental results of the information recording sheets of Examples 1 to 6 and Comparative Examples 1 to 7.

  FIG. 1 is a characteristic diagram showing the OD values of the information recording sheets of Examples 1 to 6 and Comparative Examples 1 to 7 for each sample. FIG. 2 is a characteristic diagram showing the OD values of the information recording sheets of Examples 1 to 6 and Comparative Examples 1 to 7 for each color.

  In Examples 1-6, it had a matte feeling with a good texture, the glittering part was conspicuous and the cosmetics were high. In Comparative Example 1, the pearl pigment had a glittering gloss, but the gloss was high overall and the texture was not good. Further, the printability, color developability and blocking resistance were poor. In Comparative Example 2, there is no pearly luster. When a pearl pigment was blended with conventional silica-based paper, the color developability deteriorated and the color developability deteriorated as in the results of Comparative Examples 3 and 4. In addition, there were many gloss irregularities such as fine cracks in the print head in the direction of operation of the print head. Character fatness also occurred. This is thought to be due to the small amount of coating and the effect of pearl pigments. In Examples 1 and 2 having a coating amount similar to that of Comparative Examples 3 and 4, even when a pearl pigment is added, the color developability does not deteriorate, the pearl glittering property of the printed portion is good, and the printability and color developability. Was also good. Further, in Comparative Examples 5 and 6 in which the coating amount was increased in order to improve the printing quality, the pearl pigment was sunk in the lower part of the coating layer, resulting in inferior pearly luster and poor color development. However, in Examples 3 and 4 in which the coating amount was increased, the pearly luster was excellent, and the printability and color development were also good.

  From these results, it was found that according to the present invention, the printed part having the pearl-like glitter and the ink-jet printing was also excellent in glitter. Good color development, no ink bleeding, excellent printing characteristics, and good print quality. Moreover, there was a feeling of matte as a whole, and the texture of plain paper was not impaired. Therefore, the glittering part was conspicuous, a high glittering feeling was obtained, there was a high-class feeling and the cosmetics were high. According to the present invention, it has been found that it has a texture like paper, is excellent in glitter, and has good print quality.

[Other embodiments]
The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. In addition, the constituent elements of the above embodiments can be arbitrarily combined without departing from the spirit of the invention.

It is a characteristic view which shows the OD value of the information recording paper of the present Examples 1 to 6 and Comparative Examples 1 to 7 for each sample. It is a characteristic view which shows the OD value of the information recording paper of the present Example 1- Example 6 and Comparative Examples 1-7 according to color.

Claims (7)

Information recording characterized by having a coating layer formed by coating a coating liquid containing fine fibrous cellulose, a hydrophilic resin and a pearl pigment on at least one side of a base paper mainly composed of fibrous pulp and filler Paper. 2. The information recording paper according to claim 1, wherein the fine fibrous cellulose is bacterial cellulose. The information recording paper according to claim 1 or 2, wherein the pearl pigment is contained in the coating liquid in a proportion of 0.5 wt% to 50 wt%. The information recording paper according to claim 1 or 2, wherein the pearl pigment is contained in the coating liquid in a proportion of 3 wt% to 30 wt%. The information recording paper according to claim 1, wherein the coating liquid is applied to the base paper with a coating amount of 1 g / m ² or more and 10 g / m ² or less. The information recording paper according to any one of claims 1 to 5, wherein the hydrophilic resin is an acrylic polymer, a vinyl polymer, an allyl polymer, or a mixture thereof. The information recording sheet according to claim 1, wherein the pearl pigment contains at least mica.