JP2013067129A - Glossy paper for nonaqueous inkjet printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide glossy paper which quickly absorbs ink, has excellent fixability, and forms a clear image of high density without show-through even when a nonaqueous inkjet ink is used in a high-speed inkjet printer.SOLUTION: In glossy paper for nonaqueous inkjet printing including an ink receiving layer formed on at least one surface of an original paper, the nonaqueous inkjet printing is executed through line printing. The ink receiving layer has 30 mass% or more of vinyl chloride polymer (A) having 70-90°C of a glass transition temperature. A 75-degree specular glossiness on the ink receiving surface, which is measured based on JIS P8142, is 30-60%.

Description

  The present invention relates to a glossy paper for non-aqueous ink jet printing, and in particular, includes a predetermined polymer in the ink receiving layer, whereby fast and good ink fixing when high-speed ink jet printing is performed using a non-aqueous ink. Further, the present invention relates to glossy paper for non-aqueous ink jet printing (hereinafter sometimes referred to as “glossy paper”).

  Ink jet inks are roughly classified into aqueous inks containing water in a pigment medium and non-aqueous inks substantially free of water. Non-aqueous inks have recently become widespread as inks for high-speed ink jet printers because of the advantage that paper is difficult to curl after printing. Including non-aqueous inks with a certain polar solvent system provides excellent pigment dispersion stability and storage stability. Ink has been developed that is excellent in both stability and on-machine stability (Patent Document 1). However, when printing is performed with non-aqueous ink, there is a problem that the ink is hardly absorbed by the paper and the fixability is poor.

  As a method for solving this problem, it has been proposed to provide an oil-based ink receiving glossy layer mainly composed of a vinyl chloride copolymer having a glass transition temperature of 20 to 55 ° C. on a support (Patent Document 2). . A recording sheet with such a glossy layer is suitable for printing advertisements, posters, etc., but when a normal document is printed with a high-speed inkjet printer, the ink absorbency is insufficient, and if an image is rubbed immediately after printing, characters are rubbed. End up. On the other hand, as time passes, the ink may penetrate into the paper and the ink may break through.

Japanese Patent No. 4616570 JP 2010-234677 A

  Therefore, the present invention can form a clear image with a high density, high absorbability, no show-through, and high density even when printing with a high-speed inkjet printer using non-aqueous ink. An object of the present invention is to provide glossy paper that can be used.

That is, the present invention is a glossy paper for non-aqueous ink jet printing in which an ink receiving layer is provided on at least one surface of a base paper,
The non-aqueous ink jet printing is performed by line printing,
The ink receiving layer contains a vinyl chloride polymer (A) having a glass transition temperature of 70 to 90 ° C. of 30% by mass or more of the ink receiving layer, and
The 75 degree specular gloss measured according to JIS P8142 on the surface of the ink receiving layer is 30 to 60%.
This is a glossy paper for non-aqueous ink jet printing.

  The glossy paper of the present invention contains a vinyl chloride polymer having a glass transition temperature of 70 to 90 ° C. According to Patent Document 2, the polymer is said to be inferior in ink absorptivity because it is hardly formed into a film or cracked by the heat of coating and drying, and is dried in the form of particles. However, in line printing, the ink absorbency is fast, and even when non-aqueous ink containing a polar solvent such as a chain ester solvent is used, an image excellent in fine character reproducibility can be obtained without back-through. it can.

  The glossy paper of the present invention is used in line printing. Line printing uses a plurality of inkjet heads in which a plurality of nozzles are arranged along a line in the main scanning direction, and transports printing paper to the plurality of inkjet heads in a sub-scanning direction orthogonal to the main scanning direction. In this way, the print data is printed in full line at least one line at a time on the printing paper. Since printing is performed line by line, high-speed printing is possible. The ink jet recording apparatus may be of any method such as a piezo method, an electrostatic method, or a thermal method as long as it can perform line printing.

In the glossy paper of the present invention, the vinyl chloride polymer (A) blended in the ink receiving layer is a polymer mainly composed of a vinyl chloride monomer, and has a glass transition temperature of 70 to 90 ° C., preferably 75. ~ 87 ° C. Here, the main component means that a unit derived from a comonomer other than vinyl chloride can be included in the range until the glass transition of the vinyl chloride homopolymer at about 90 ° C. reaches 70 ° C. With a polymer having a glass transition temperature lower than the lower limit, the ink absorbability in line printing is not sufficient. The glass transition temperature can be measured using a differential scanning calorimeter or a viscoelasticity measuring device. Or you may obtain | require by calculation from the weight fraction of each monomer component, and the glass transition temperature of the homopolymer of this component. As an example of the vinyl chloride polymer (A), Vinibrand 985 (manufactured by Nissin Chemical Industry Co., Ltd.) can be mentioned.

  The vinyl chloride polymer (A) is a polymer obtained by emulsion polymerization by adding an emulsifier and a polymerization initiator to a mixture of a vinyl chloride monomer and optionally a comonomer, and is applied to a base paper in the form of an emulsion. Give. As the comonomer, an ethylenically unsaturated monomer is used, and examples thereof include (meth) acrylic acid, (meth) acrylic acid ester, acrylonitrile, vinyl acetate, and monoalkenyl aryl compounds. As the emulsifier, an anionic emulsifier such as an alkyl sulfate, a cationic emulsifier such as a trialkylammonium chloride, a nonionic emulsifier such as a polyoxyethylene alkyl ether, and a combination thereof can be used. As the polymerization initiator, a persulfate such as ammonium persulfate can be used.

  The vinyl chloride polymer (A) is contained in an amount of 30% by mass or more, preferably 33% by mass or more of the ink receiving layer. When the amount of the polymer is less than 30% by mass, the ink absorbability and the ink fixability are not sufficiently improved. The ink absorptivity can be evaluated by rubbing the image immediately after printing, and the ink fixing property can be evaluated by rubbing the image after a while after printing, the details of which will be described in detail in Examples. There is no upper limit of the amount of the vinyl chloride polymer (A), and it may be 100% by mass.

  Preferably, the ink receiving layer further includes silica fine particles (C) having a particle diameter of less than 1 μm. Such silica fine particles (C) have a particle diameter of less than 1 μm, preferably 10 to 500 nm. The particle diameter can be measured by observation with an electron microscope. When the particle diameter is 1 μm or more, it is difficult to obtain a desired gloss. Such silica fine particles (C) can be obtained by blending colloidal silica having the above particle diameter range into the ink receiving layer. The colloidal silica may be spherical or non-spherical colloidal silica in which a plurality of spherical colloidal silicas are connected as long as the above particle diameter is satisfied. The particle diameter of colloidal silica can be determined by a laser diffraction / scattering method.

  The silica fine particles (C) are contained in an amount of 30 to 70% by mass, preferably 34 to 67% by mass of the ink receiving layer. If the amount of silica fine particles (C) is less than the lower limit, fine character reproducibility, that is, there is no bleeding in the fine character image, tends to be inferior, and if the amount exceeds the upper limit, ink absorbability and ink fixability tend to be inferior. is there. When the ink receiving layer also contains the following vinyl chloride polymer (B), the amount of silica fine particles (C) is preferably 30 to 50% by mass of the ink receiving layer.

  In addition to the silica fine particles (C), a vinyl chloride polymer (B) having a glass transition temperature of 20 to 60 ° C. is 10 to 50% by weight, preferably 20 to 40% by weight of the ink receiving layer. You may mix | blend. As a result, the ink fixing property can be improved. If the amount of the vinyl chloride polymer (B) is less than the lower limit, the ink fixability is insufficiently improved. If the amount exceeds the upper limit, the ink absorbability and fine character reproducibility tend to deteriorate.

  The vinyl chloride polymer (B) contains a comonomer in an amount that falls within the above glass transition temperature, preferably 15 to 40 mol%, more preferably 20 to 30 mol%. As the comonomer, (meth) acrylic acid esters such as ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are preferable.

  The ink receiving layer preferably has a thickness of 3 μm to 15 μm after drying, and more preferably has a thickness of 5 μm to 10 μm. If the thickness is less than the lower limit value, the glossiness is low and the showthrough tends to be poor. On the other hand, if the thickness exceeds the upper limit value, the glossiness is improved but the ink absorbability tends to be deteriorated.

  The ink receiving layer may contain conventional additives in an amount that does not impair the effects of the present invention. Examples of the additive include a dispersant, an antioxidant, a pH adjuster, and an antifoaming agent.

An intermediate layer may be provided between the ink receiving layer and the base paper. The intermediate layer preferably contains silica particles having a particle diameter of 1 μm or more and a water-soluble polymer. When the average particle diameter of the silica particles is smaller than 1 μm, the glossiness is improved but the ink absorbability tends to be deteriorated. The average particle diameter can be determined by electron microscope observation or laser diffraction / scattering method. The silica particles are preferably amorphous silica having an average particle diameter of 1 to 20 μm, preferably 3 to 15 μm. The amorphous silica may be prepared by any method such as a precipitation method or a gel method. By providing the intermediate layer, the uniformity of the solid image can be improved.

  Examples of water-soluble polymers include polyvinyl alcohol and derivatives thereof, proteins such as casein, starch and derivatives thereof, vinyl polymers such as casein and ethylene-vinyl acetate copolymers, polyvinyl pyrrolidone, polyacrylamide polymers, and polyvinyl butyral. Polymers, or those obtained by adding a hydrophilic functional group to these various polymers. Of these, polyvinyl alcohol, vinyl polymers, and polyvinylpyrrolidone are preferable, and polyvinyl alcohol and ethylene-vinyl acetate copolymer are preferred. Coalescence is more preferred.

  The mass ratio of the water-soluble polymer to the silica particles (water-soluble polymer / silica particles) in the intermediate layer is 20/80 to 60/40, preferably 30/70 to 50/50. When the ratio of the water-soluble polymer is larger than the upper limit, the ink absorbability tends to deteriorate, and when the ratio is lower than the lower limit, the coating strength of the intermediate layer tends to decrease. The intermediate layer can also contain additives such as a dispersant, an antioxidant, and a pH adjuster in an amount that does not impair the effects of the present invention, like the ink receiving layer.

  The intermediate layer preferably has a thickness of 2 μm to 15 μm, more preferably 3 μm to 10 μm. The mass ratio of the intermediate layer to the ink receiving layer (intermediate layer / ink receiving layer) is preferably 10/90 to 60/40, more preferably 15/85 to 50/50.

  In the present invention, the base paper may be any material as long as it is used for inkjet paper. As the raw material pulp, any of those conventionally used for papermaking can be used. For example, hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood bleached sulfite pulp (LBSP), softwood bleached monkey Examples include wood pulp such as chemical pulp such as phytopulp (NBSP), mechanical pulp such as groundwood pulp (GP), and thermomechanical pulp (TMP), and waste paper pulp (DIP). Further, non-wood pulp such as cotton pulp, hemp, bagasse, kenaf, esparto, cocoon, trifoam, and husk can also be used. Preferably, hardwood bleached kraft pulp (LBKP) is used.

  As the filler, calcium carbonate, kaolin, talc, zeolite, alumina or the like can be used. Preferably, calcium carbonate, talc, or a combination thereof is used. Furthermore, sizing agents such as starch and rosin, paper strength enhancers, antifoaming agents, pH adjusting agents, dyes and colored pigments for adjusting hue, fluorescent dyes for improving visual whiteness, etc. Additives can be blended.

As the paper machine for making the base paper, known apparatuses such as a long net paper machine, a twin wire paper machine, and a Yankee paper machine can be appropriately used. The base paper preferably has an air permeability resistance (Gurley test machine method) of 2.0 according to JIS P8177: 2009 “Paper and paperboard—Air permeability and air resistance test method (intermediate region) Gurley method”. The density measured according to JIS P8118: 1998 “Test method of thickness and density” is 0.60 to 0.80 g / cm ³ . More preferably, it is 0.65 to 0.80 g / cm ³ , and the ash content measured according to JIS P8251: 2003 “Paper, paperboard and pulp-ash content test method—525 ° C. combustion method” is 15 to 25%, more preferably Is 16-23%. A base paper having these characteristics has good ink absorbability and fixability according to the present invention, and has little show-through. These properties are achieved by adjusting the amount of internal additive, jet wire ratio, profile, press, calendar, and other paper making conditions, and by adjusting the drying conditions such as the vapor pressure and ventilation method of the paper machine dryer. can do.

  The ink receiving layer and the intermediate layer can be formed by applying or impregnating a liquid mixture of components constituting each layer to a base paper by a known coating method or impregnation method, and then drying. The impregnation can be performed using an impregnation type size press apparatus, and the coating is performed by various known coating apparatuses such as a blade coater, a roll coater, an air knife coater, a bar coater, a curtain coater, a gravure coater, and a gate roll coater. Can be used.

  As a drying method, for example, a normal method using a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, a cylinder dryer, or the like can be performed. After drying, if necessary, finish processing such as machine calendar, super calendar, soft calendar, etc., which is post-processing, may be given to give smoothness so as to be within the specified gloss range, other general Any paper processing means may be used.

  The glossy paper thus obtained has a 75 ° specular gloss of 30% to 60%, preferably 30%, measured according to JIS P8142: 2005 “Method for Measuring 75 ° Specular Gloss” on the surface of the ink receiving layer. ~ 50%. If the glossiness is not less than the lower limit, it is sufficient as glossy paper. However, glossy paper whose glossiness exceeds the upper limit value has poor ink fixability and low image density. The glossiness can be achieved by using the vinyl chloride polymer (A) at 30% by mass or more of the ink receiving layer, but it is finer depending on the calendering pressure and the amount of silica fine particles (C). You can make adjustments. That is, the glossiness of the glossy paper tends to increase as the calendering pressure increases and the silica fine particle (C) content increases. However, when the pressure by the calendar process is too high, the ink absorbability tends to be deteriorated, and therefore it is preferable to use the adjustment based on the content of the silica fine particles (C).

  The glossy paper of the present invention is used for inkjet recording using a non-aqueous ink (hereinafter sometimes referred to as “ink”) containing at least a pigment and an organic solvent. As the pigment, regardless of inorganic pigments and organic pigments, those generally used in the printing field can be used. Specifically, for example, carbon black, cadmium red, molybdenum red, chrome yellow, cadmium yellow, titanium yellow, chromium oxide, pyridian, cobalt green, ultramarine blue, Prussian blue, cobalt blue, azo pigment, phthalocyanine pigment Conventionally known pigments such as quinacridone pigments, isoindolinone pigments, dioxazine pigments, selenium pigments, perylene pigments, perinone pigments, thioindigo pigments, quinophthalone pigments and metal complex pigments are not particularly limited. Can be used. These pigments may be used alone or in appropriate combination, but are 0.01 to 20% by mass, more preferably 1 to 15% by mass, and further preferably 5 to 5% in the ink. It is contained in the range of 10% by mass.

  Examples of organic solvents include non-polar organic solvents such as aliphatic hydrocarbon solvents, alicyclic hydrocarbon solvents, and aromatic hydrocarbon solvents; ester solvents, alcohol solvents, higher fatty acid solvents, ether solvents, and the like. Polar solvents can be used. Examples of the aliphatic hydrocarbon solvent and the alicyclic hydrocarbon solvent include, for example, Tclean N-16, Tclean N-20, Tclean N-22, Nisseki Naphthezol L, Nisseki Naphthezol M, Nisseki Naphthezol H, No. 0 Solvent L, No. 0 Solvent M, No. 0 Solvent H, Nisseki Isosol 300, Nisseki Isosol 400, AF-4, AF-5, AF-6, and AF-7 (all manufactured by JX Nikko Nisshin Energy) , IsoparG, IsoparH, IsoparL, IsoparM, ExxsolD40, ExxsolD80, ExxsolD100, ExxsolD130, and ExxsolD140 (all manufactured by ExxonMobil). Examples of the aromatic hydrocarbon solvent include Nisseki Cleansol G (alkylbenzene, manufactured by JX Nikko Nisshin Energy Co., Ltd.), Solvesso 200 (manufactured by ExxonMobil), and the like.

  As the ester solvent, higher fatty acid esters having 12 or more carbon atoms can be used. Specifically, methyl laurate, isopropyl laurate, hexyl laurate, isopropyl myristate, isopropyl palmitate, isooctyl palmitate , Methyl oleate, ethyl oleate, isopropyl oleate, butyl oleate, methyl linoleate, isobutyl linoleate, ethyl linoleate, isopropyl isostearate, soybean oil, soybean oil isobutyl, tall oil methyl, tall oil isobutyl, adipine Diisopropyl acid, diisopropyl sebacate, diethyl sebacate, propylene glycol monocaprate, trimethylolpropane tri-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, etc. It can gel. As the alcohol solvent, a higher alcohol having 12 or more carbon atoms can be used, and specific examples include isomyristyl alcohol, isopalmityl alcohol, isostearyl alcohol, oleyl alcohol and the like. As the higher fatty acid solvent, a higher fatty acid solvent having 12 or more carbon atoms can be used, and examples thereof include isononanoic acid, isomyristic acid, hexadecanoic acid, isopalmitic acid, oleic acid, and isostearic acid. Examples of the ether solvent include diethyl glycol monobutyl ether, ethylene glycol monobutyl ether, propylene glycol monobutyl ether, propylene glycol dibutyl ether and the like.

  Two or more of the above solvents can be mixed and used. Preferably, an ester solvent, particularly an ester solvent having 14 to 30 carbon atoms such as isooctyl palmitate, and an alcohol solvent, particularly an alcohol solvent having 12 to 24 carbon atoms such as isomyristyl alcohol, are preferably included. The amount of these solvents is preferably 5 to 50% by mass of the ester solvent and 10 to 70% by mass of the alcohol solvent, more preferably the ester solvent is based on the total mass of the ink. 10 to 40% by mass, and the alcohol solvent is 15 to 60% by mass. A combination of these solvents with an aliphatic hydrocarbon solvent and / or an alicyclic hydrocarbon solvent is preferred.

  More preferably, the ester value of the ink is 20 to 80, particularly 22 to 75, and the hydroxyl value is 30 or more, particularly 60 or more. The ester value is given by the amount of potassium hydroxide (mg) necessary to completely saponify the ester contained in 1 g of ink, and is measured by potentiometric titration based on JIS K0070. The hydroxyl value is given by the amount of potassium hydroxide (mg) necessary to neutralize acetic acid bonded to the acetylated product obtained from 1 g of ink, and the potentiometric titration method based on JIS K0070 as in the case of the ester value. Can be measured.

  The ink preferably contains a pigment dispersant. Examples of the pigment dispersant include a hydroxyl group-containing carboxylic acid ester, a salt of a long chain polyaminoamide and a high molecular weight acid ester, a salt of a high molecular weight polycarboxylic acid, a salt of a long chain polyaminoamide and a polar acid ester, a high molecular weight unsaturated acid ester, Polymer copolymer, modified polyurethane, modified polyacrylate, polyether ester type anionic activator, naphthalene sulfonic acid formalin condensate salt, aromatic sulfonic acid formalin condensate salt, polyoxyethylene alkyl phosphate ester, polyoxyethylene Nonylphenyl ether, polyester polyamine, stearylamine acetate, and the like can be used, but a pigment dispersant having an ester group is preferably used. The pigment dispersant is contained in the ink in an amount of 0.01 to 20% by mass, more preferably 0.5 to 10% by mass, and still more preferably 1 to 5% by mass in the amount of active ingredient.

  Specific examples of the pigment dispersant include Solsperse 17000, Solsperse 18000, Solsperse 13940, Solsperse 28000 (all trade names, manufactured by Lubrizol); Florene DOPA-15B (trade name, manufactured by Kyoeisha Chemical Co., Ltd.); DA-703 50, DA-7300, DA234 (all trade names, manufactured by Enomoto Kasei Co., Ltd.); Disperbyk-101 (trade names, manufactured by Byk Chemie), Hinoact (trade names, manufactured by Kawaken Fine Chemical Co., Ltd.), and the like. Among these, a pigment dispersant having a polyesteramine structure can be particularly preferably used. Specific examples include Solsperse 18000, Solsperse 13940, Solsperse 28000 (all trade names, manufactured by Lubrizol). By using such a pigment dispersant having an ester group in combination with the ester solvent, the pigment dispersant and the solvent have the same structure as an ester structure, so that moderate solubility can be obtained between them. Thus, an oil-based ink excellent in pigment dispersion stability can be obtained. Further, the urethanized oil described in Japanese Patent Application No. 2010-125785 by the applicant of the present application, the (meth) acrylate-based polymer having a urethane group described in Japanese Patent Application Laid-Open No. 2010-1452, and the alkyl described in Japanese Patent Application No. 2009-262702 by the present applicant. A (meth) acrylate copolymer or the like can also be used.

  Furthermore, a synergist which is a pigment derivative having a polar group introduced into the pigment skeleton may be included. Examples of pigment skeletons include azo pigments, phthalocyanine pigments, quinacridone pigments, perylene pigments, isoindoline pigments, benzimidazolone pigments, pyranthrone pigments, thioindigo pigments, and quinophthalone pigments. Examples of the polar group include an alkylamino group, a carboxyl group, a sulfonic acid group, and a phthalimide group. Among these, phthalocyanine pigments, particularly those obtained by introducing a sulfonic acid group, an amino group or the like into the skeleton of copper phthalocyanine blue, such as copper phthalocyanine sulfonate (Solsperse 5000, Solsperse 12000, Solsperse 22000; all manufactured by Nippon Lubrizol Co., Ltd.) ).

  The ink is added to a disperser such as a bead mill with a pigment, an organic solvent, and a pigment dispersant, and optionally, optional components such as an antioxidant and a viscosity adjuster, all at once or divided and stirred and mixed. If desired, it can be obtained by filtering with a membrane filter or the like.

  The suitable range of the viscosity of the ink varies depending on the nozzle diameter of the ejection head of the inkjet recording system, the ejection environment, and the like, but in general, it is preferably 5 to 30 mPa · s at 23 ° C., and preferably 5 to 15 mPa · s. Is more preferable, and is most preferably about 10 mPa · s. Here, the viscosity represents a value at 10 Pa when the shear stress is increased from 0 Pa at a rate of 0.1 Pa / s at 23 ° C.

  Examples of the present invention will be described below, but the present invention is not limited thereto. In the examples, “%” represents “mass%” and “part” represents “part by mass”.

[Preparation of base paper]
10 parts of calcium carbonate (Tama Pearl TP-121, manufactured by Okutama Kogyo Co., Ltd.), talc (talc NTL, manufactured by Nippon Talc Co., Ltd.) ) After papermaking 4 parts, 0.8 parts of cationized starch (Kate 308, manufactured by Japan NSC), 0.2 parts of neutral rosin sizing agent (NT-85, manufactured by Arakawa Chemical Industries), Soft calendering was performed to obtain a base paper (referred to as “base paper 1”) having a weight of 82.9 g / m ² . The obtained base paper was measured for air resistance (JIS P8177), density (JIS P8118), ash (JIS P8251), and the like.
Air permeability resistance: 48 seconds Density: 0.81 g / cm ³
Ash content: 14.6%

A base paper 2 having the following characteristics was prepared in the same manner as the base paper 1 except that the freeness was 500 cc, calcium carbonate 20 parts, talc 0 parts, and neutral rosin sizing agent 0.3 parts.
Air permeability resistance: 5 seconds Density: 0.69 g / cm ³
Ash content: 21.8%

A base paper 3 having the following characteristics was prepared in the same manner as the base paper 1 except that the freeness was 450 cc, calcium carbonate 11 parts, talc 5 parts, and neutral rosin sizing agent 0.1 parts.
Air permeability resistance: 21 seconds Density: 0.67 g / cm ³
Ash content: 16.2%

Base paper 4 having the following characteristics was prepared in the same manner as base paper 1 except that the freeness was 430 cc, calcium carbonate 14 parts, talc 6 parts, and neutral rosin sizing agent 0.5 parts.
Air permeability resistance: 27 seconds Density: 0.79 g / cm ³
Ash content: 21.6%

A vinyl chloride polymer (A) (Vinyl Blanc 985, glass transition point 80 ° C., manufactured by Nissin Chemical Industry Co., Ltd.) is applied to one side of the base paper 1 with an air knife coater so that the dry coating amount is 7 g / m ^2. And dried at 120 ° C. to form an ink receiving layer to obtain glossy paper.

  Except that a mixture of 33 parts of vinyl chloride polymer (A) and 67 parts of colloidal silica (silica doll 40, particle size 18.7 nm, manufactured by Nippon Chemical Industry Co., Ltd.) was used as the coating liquid. In the same manner as in Example 1, an ink receiving layer was formed to obtain glossy paper.

  As a coating solution, 30 parts of a vinyl chloride polymer (A), 30 parts of a vinyl chloride polymer (B) (Vinyl Blanc 278, glass transition point 33 ° C., manufactured by Nissin Chemical Industry Co., Ltd.), and 40 parts of colloidal silica An ink receiving layer was formed in the same manner as in Example 1 except that a mixture with was used to obtain glossy paper.

  As in Example 1, except that 33 parts of vinyl chloride polymer (A), 33 parts of vinyl chloride polymer (B), and 34 parts of colloidal silica were used as the coating solution. An ink receiving layer was formed to obtain glossy paper.

To one side of the base paper 1, 100 parts of synthetic amorphous silica (Mizukasil P-78A, manufactured by Mizusawa Chemical Co., Ltd.) and water were added, and the silica slurry was adjusted with a Cowles disperser so that the solid content concentration was 20%. As a binder, 40 parts of polyvinyl alcohol (PVA-117, manufactured by Kuraray Co., Ltd.) and 15 parts of ethylene vinyl acetate copolymer emulsion (Polysol EVA AD-10, manufactured by Showa Denko Co., Ltd.) are added to the silica slurry, and water is added. Was added to obtain a liquid mixture having a solid content of 7.5%. This was coated with an air knife coater so that the dry coating amount was 1.95 g / m ² and then dried at 120 ° C. to obtain an intermediate layer. On the intermediate layer, the vinyl chloride polymer (A) was applied by an air knife coater so that the dry coating amount was 7 g / m ^2, and then dried at 120 ° C. to form an ink receiving layer. A glossy paper was obtained. The mass ratio of the intermediate layer / ink receiving layer was 21.8 / 78.2.

  An ink receiving layer was formed in the same manner as in Example 1 except that the base paper 2 was used to obtain a glossy paper.

  An ink receiving layer was formed in the same manner as in Example 1 except that the base paper 3 was used to obtain a glossy paper.

  An ink receiving layer was formed in the same manner as in Example 1 except that the base paper 4 was used to obtain a glossy paper.

  An ink receiving layer was formed on both sides of the base paper 1 in the same manner as in Example 1 to obtain glossy paper.

<Comparative Example 1>
One side of the base paper 1 was treated in the same manner as in Example 1 except that the vinyl chloride polymer (B) was used instead of the vinyl chloride polymer (A).

<Comparative example 2>
The vinyl chloride polymer (A) was applied and dried in the same manner as in Example 1, and then subjected to a heat calendar treatment at 80 ° C. to obtain glossy paper having a glossiness of 70%.

<Comparative Example 3>
Colloidal silica was applied to one side of the base paper 1 so that the dry coating amount was 7 g / m ^2, and then dried at 120 ° C.

[75 degree specular gloss]
About each obtained glossy paper, 75 degree specular glossiness (%) of the white paper part was measured according to JISP8142. The results are shown in Tables 10 and 11.

＜シアンインク＞

＜マゼンタインク＞

[Preparation of non-aqueous ink]
Each component shown in the following table was placed in a glass container, and 80 g of zirconia beads (φ0.5 mm) were placed therein, and the ink was prepared by operating at a frequency of 60 Hz for 2 hours using a rocking mill (Seiwa Giken, RM05S type). .
<Black ink>

<Cyan ink>

<Magenta ink>

Each glossy paper was printed with each of the above inks and evaluated by the following method.
Ink jet printers (ORHPIS X9050, manufactured by Riso Kagaku Kogyo Co., Ltd.) were filled with black, cyan, and magenta ink paths, respectively, with ink from Table 1, Table 2, and Table 3, respectively, and printed by line printing. . The results are shown in Tables 10 and 11.
<Density and strikethrough>
Using an inkjet printer (ORHPIS X9050), print with 1.5 cm x 5 cm square solid black on plain paper setting, leave the resulting solid image at room temperature for 24 hours, and then optically measure the surface OD value of the solid black spot It was measured with a densitometer (RD-19i, manufactured by Macbeth Co.) and evaluated according to the criteria shown in Table 4. Further, in order to evaluate the back-through, the difference between the back surface OD value of the black solid portion and the OD value of the unprinted white portion was obtained and evaluated according to the criteria in Table 5.

<Reproducibility of fine characters>
A chart (JEITA standard pattern J6) was printed with plain paper settings of an inkjet printer (ORHPIS X9050), and the bleeding of the fine character reproduction portion was visually observed and evaluated according to the following criteria.

<Solid uniformity>
Using an inkjet printer (ORHPIS X9050), printing was performed on glossy paper with 1.5 cm × 5 cm square black solid on plain paper setting, and the uniformity of the solid image was visually observed and evaluated according to the following criteria.

<Ink absorbability>
Use an inkjet printer (ORHPIS X9050) to print 1.5cm x 5cm square black solid on glossy paper with plain paper setting, and leave the resulting solid image for 5 seconds, then JIS L0849 Using a friction tester I type (clock meter) based on the “degree test method”, the load was about 9 N, and rubbed once, and the change in the solid portion was visually observed and evaluated according to the following criteria.

<Ink fixability>
Except for leaving the black solid image for 24 hours and rubbing for 5 reciprocations, the change in the solid portion was visually observed in the same manner as the ink absorbency and evaluated according to the following criteria.

  As shown in Table 10, each of the glossy papers of Examples not only absorbed the ink quickly but also had no back-through, and was able to form a sharp and uniform image. On the other hand, as shown in Table 11, the ink-receiving layer mainly composed of a polymer having a low glass transition temperature (Comparative Example 1) is slow in absorbing ink, but has been seen to show through through time. . Further, even when a polymer having a glass transition temperature within the range of the present invention was used, when the gloss level exceeded the range of the present invention (Comparative Example 2), the ink absorbability deteriorated. Further, the ink receiving layer composed only of silica fine particles (Comparative Example 3) had a high image density but poor ink absorbability.

  The glossy paper of the present invention is suitable for high-speed ink jet printing because it absorbs ink quickly, has excellent fixability, does not show through, has a high density, and can form a clear image.

Claims (5)

A glossy paper for non-aqueous ink jet printing in which an ink receiving layer is provided on at least one surface of a base paper,
The non-aqueous ink jet printing is performed by line printing,
The ink receiving layer contains a vinyl chloride polymer (A) having a glass transition temperature of 70 to 90 ° C. of 30% by mass or more of the ink receiving layer, and
The 75 degree specular gloss measured according to JIS P8142 on the surface of the ink receiving layer is 30 to 60%.
Glossy paper for non-aqueous ink jet printing characterized by the above.   2. The non-aqueous inkjet printing according to claim 1, wherein the ink receiving layer further contains silica fine particles (C) having an average particle diameter of less than 1 μm in an amount of 30 to 70% by mass of the ink receiving layer. Glossy paper.   The ink receiving layer further comprises a vinyl chloride polymer (B) having a glass transition temperature of 20 to 60 ° C in an amount of 20 to 40% by mass of the ink receiving layer. 2. Glossy paper for non-aqueous ink jet printing according to 2.   An intermediate layer is provided between the base paper and the ink receiving layer, and the intermediate layer includes silica particles having an average particle diameter of 1 μm or more and a water-soluble polymer, and the mass ratio of the intermediate layer to the ink receiving layer is 10 The glossy paper for non-aqueous ink jet printing according to any one of claims 1 to 3, wherein / 90 to 60/40. The base paper has an air resistance measured in accordance with JIS P8177 of 2.0 to 30 seconds, a density measured in accordance with JIS P8118 of 0.60 to 0.80 g / cm ³ , and measured in accordance with JIS P8251. The glossy paper for non-aqueous ink jet printing according to any one of claims 1 to 4, wherein the ash content is 15 to 25%.