TW200301222A - Inorganic porous micro particle - Google Patents

Abstract

This invention provides sol of meso porous material with small diameter, being organic and uniform in pore size and a synthetic method thereof and applications using the sol, especially inkjet recording media of excellent ink absorption, transparency, water resistance and light resistance and inkjet recording media coating liquid. The invention contains sol of inorganic porous material with average diameter of 10- 400 nm, determined by the dynamic light scattering method, primary particle average aspect ration greater than 2, meso pores with uniform diameter and without secondary agglomeration.

Description

20030122- A7 B7 V. Description of the Invention (1) Technical Field (Read the precautions on the back before filling in this document. The present invention is a sol related to microparticles and inorganic porous substances, its synthesis method, use and use of the sol. Inkjet recording media such as inkjet recording paper, paper sheets, films, and cloths used for inkjet printing and recording, and inkjet recording medium coating solutions used in the manufacture thereof. BACKGROUND ART The technology of inorganic fine particles has not only improved The functions of electronic materials are also attracting attention from energy saving and environmental protection points. Inorganic fine particles are mainly produced by gas phase method or liquid phase method. Aerosi 1 or colloidal silica is known. Metal particles such as oxides or gold colloids. Most of them are dense particles without pores inside the particles. On the other hand, as for inorganic amorphous porous materials, although the gaps between particles are not pores Gels such as silicone gels or alumina gels, amorphous activated carbons, etc., but generally have larger particle diameters. Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs Manufactured in Japanese Unexamined Patent Publication No. 4-702 55, etc., although porous spherical silica particles are disclosed, but the shape of irregular pores with small pore diameters is small. Chem. Lett., (2 0 0 0) 1 044 or Stu. Sur. Sci. Catal., 129 (2000) 37, Japanese Patent Application Laid-Open No. 2000-109312, etc., although inorganic porous fine particles synthesized using terephthalate are disclosed, However, no matter what, a precipitate can be obtained, but a finely dispersed sol cannot be obtained. In Japanese Patent Application Laid-Open No. 1 1-1 00208, a rod-shaped mesoporous powder having a relatively large diameter is disclosed. However, the use of a cationic surfactant and a metal silicate acid will cause precipitation and fail to obtain fine particles. -5- This paper size applies Chinese National Standard (CNS) A4 specifications (210X 297 public :) 20030122 A7 B7 V. Description of the invention (2) (Please read the precautions on the back before filling out this page) Dispersed sol. In USP 6096469, although it is disclosed that a porous body sol using terephthalate has been synthesized, only In the examples, the terephthalate was not removed However, the porous sol was not realized. Although the porous fine particle sol was disclosed in WO 0 2/0 0 5 50, the aspect ratio and the degree of aggregation were not described therein. The recording method uses less noise during recording and makes colorization easier. Local speed recording can be used in a wide range of fields. However, high-quality paper used in general printing has poor ink absorption, poor drying properties, and high resolution. The quality of the day is also low, and there is a proposal for a special paper to improve these shortcomings. In order to improve the color development and reproducibility of the ink, various inorganic pigment-based recording papers have been coated with amorphous silica. Revealed (Japanese Patent Laid-Open No. 5 5-5 1 5 8 3, Japanese Patent Laid-Open No. 5 6-1 485 85). However, with the improvement of the performance of inkjet printers in recent years, the recording medium side is required to further improve the performance, and the aforementioned technology alone may not be able to meet the performance. In particular, in order to obtain the high image quality of ordinary silver salt photography, the ink absorption is insufficient and the occurrence of ink bleeding caused by an increase in the inkjet discharge amount per unit area of the recording medium is increased. Furthermore, in order to show high image quality, color density, and transparency of the ink absorbing layer, which are comparable to those of silver salt photography, it is also required. The Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs printed in Japanese Unexamined Patent Publication No. 10-63 63 79. Although it has been disclosed that inkjet papers using inorganic particles having a relatively long diameter have been used, this is a Porous microparticles tend to have lower ink absorption than porous ones. In Japanese Patent Application Laid-Open No. 1 0-3 29406 and Japanese Patent Application Laid-Open No. 10- 1 66 7 1 5, although it is disclosed that a recording sheet using silicon dioxide particles connected to several beads has been used, the two Silicon oxide particles are not -6- This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) 20030122 A7 _____B7_ V. Description of the invention (3) Porosity, so compared with porous, there is ink Poor absorption. (Please read the precautions on the back before filling out this page.) The present invention provides a sol with a small particle size, an inorganic and uniform pore size, and a method for synthesizing it. In addition, the use of the sol is particularly applicable to inkjet recording media having excellent ink absorption, transparency, water resistance, and light resistance, inkjet recording media, and inkjet recording body coating solutions. Disclosure of the Invention That is, the present invention is as follows. (1) A sol containing particles having an average particle diameter of 10 to 400 nm measured by a dynamic light scattering method, an average aspect ratio of a primary particle of 2 or more, and a uniform diameter mesopore, substantially the same Sub-agglomerated inorganic porous material. (2) The sol according to (1), wherein the mesopores are elongated in the major axis direction. (3) The sol according to (1) or (2), which includes the converted specific surface area SL obtained from the average particle diameter DL of the particles measured by the dynamic light scattering method and the nitrogen adsorption ratio of the particles obtained by the BET method. The difference Sb-Sl in the surface area sB is 25 0 m2 / g or more. Printed by the Intellectual Property Cooperative of the Ministry of Economic Affairs' Consumer Cooperative (4) A sol such as any one of (1) to (3), where the average aspect ratio is 5 or more. (5) The sol according to any one of (1) to (4), wherein the inorganic porous substance is made of silicon oxide. (6) The sol according to (5), in which the inorganic porous substance contains aluminum-7- This paper size is applicable to China National Standard (CNS) A4 specification (210X 297 mm) 20030122 A7 B7 V. Description of the invention (4) (7) The sol according to any one of (1) to (6), wherein the average diameter of the mesopores is from 6 nm to 18 nm. (8) The sol according to any one of (1) to (7), which is a compound in which an organic chain is bound to the inorganic porous substance. (9) The sol according to (8), wherein the compound containing the organic chain is a silane coupling agent. (10) The sol according to (9), wherein the silane coupling agent contains a fourth-order ammonium group and / or an amine group. (1 1) The sol according to any one of (1) to (1 0), wherein the inorganic porous substance contains those connected and / or divided into a rosary shape. (1 2) A porous substance obtained by removing a solvent from the sol according to any one of (1) to (1 1). (1 3) — A method for producing a sol containing an inorganic porous substance, comprising a metal source and a model made of a metal oxide and / or a precursor thereof, and a solvent to produce a dispersion of the metal oxide / model composite And a method for manufacturing a sol of an inorganic porous substance formed by the step of removing the model from the composite, in the mixing step, adding a metal source to the model solution or adding the model solution to the metal source. It takes more than 3 minutes. (14) The manufacturing method according to (1 3), wherein the adding time is 5 minutes or more. (I 5) The manufacturing method according to (1 3) or (1 4), wherein the metal source is active silicon dioxide. (1 6) The manufacturing method of any one of (1 3) to (1 5), in which the paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) · 8 (Please read the back first (Please fill in this page again)

Printed by 1T Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs. The model is based on the following structure 20030122. A7 ___ B7 V. Description of the invention (5) The model is a non-ionic surfactant. (1 7) A manufacturing method such as (1 6)

RO (c2h4o) a- (c3H6o) b- (C2H4〇) cR (However, a and c are each 10 to 110, b represents 30 to 70, and R represents a chlorine atom or an alkyl group having 1 to 12 carbon atoms.) Non-ionic surfactant, the weight ratio of solvent to the weight of the model (solvent / model) is in the range of 10 to 1,000, so that the metal source and the model are mixed with the solvent. (1 8) The manufacturing method according to any one of (1 3) to (1 7), which is the weight-to-weight ratio (model / Si〇2) of the model's Si〇2 conversion weight of the active silicon dioxide of the metal source. ) Is in the range of 0.01 to 30. (1 9) The production method according to any one of (1 3) to (1 8), further comprising a step of adding an acid and alkali. (2 0) The manufacturing method according to any one of (1 3) to (1 9), after mixing a metal source made of a metal oxide and / or a precursor thereof with a model and a solvent, adding a base and adjusting Step of pH to 7 ~ 10. (21) The manufacturing method according to any one of (13) to (20), wherein the removing step is performed by an ultrafiltration method. (22) The manufacturing method according to (2 1), wherein the ultrafiltration membrane is a hydrophilic membrane. (23) For the manufacturing method of any one of (! 3) ~ (20), the Chinese standard (CNS) A4 specification (210X297 mm) mm ^ i φ Jm (Please read the Note: Please fill in this page again.) Binding and printing printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-9-20030122. A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (6) Add silane coupling agent This is to adjust the pH to near the isoelectric point and gelate it. This removal step is performed. After the removal step, the pH is separated from the isoelectric point and dispersed. (24) The manufacturing method according to any one of (13) to (23), in the removing step, cooling the sol to below the cell formation temperature of the model. (25) The production method according to any one of (13) to (24), which includes a step of concentrating by distillation after the removing step. (2 6) The manufacturing method according to any one of (1 3) to (2 5), which further uses a model removed from the metal oxide / model composite. (27) The manufacturing method of (26) is based on the reuse of the model, and includes the step of heating the solution of the model removed from the metal oxide / model complex to a temperature above the cell formation temperature and concentrating the model by ultrafiltration. (28) The manufacturing method according to (27), wherein a hydrophilic membrane is used for the filtration membrane of the ultrafiltration at the time of reuse. (2 9) — an inkjet recording medium made of a support and at least one ink absorbing layer provided on the support, and at least one layer of the ink absorbing layer contains a porous substance (1 2) . (30) A coating liquid for an inkjet recording medium, which is a sol containing any one of (1) to (11). <Best Mode for Carrying Out the Invention> The present invention will be described in detail below. The present invention is related to containing particles having an average particle diameter of 10 to 400 nm measured by a dynamic light scattering method, and an average aspect ratio of a primary particle of 2 or more, which is long (please read the precautions on the back before filling this page) &gt; • The size of the bound and bound paper is in accordance with the Chinese National Standard (CNS) A4 specification (210X297 mm) -10- 200 ^ 0122 A7 _B7_ V. Description of the invention (7) A substantially positive hole with a center hole extending in the axial direction Sol of secondary agglomerated inorganic porous material. (Please read the precautions on the back before filling this page) In the present invention, pores refer to pores of 2 to 5 Onm, and the long axis direction means the larger of the average particle diameter and average particle length of the primary particles.方向 之 向. In the secondary agglutination system of the present invention, those whose primary particles are connected to each other and / or strongly aggregated cannot be easily dispersed into a state of primary particles. The presence or absence of secondary agglomeration is determined by spraying the fully diluted sol with an electron microscope. When the number of primary particles / the number of total particles is 0.5 or more, it can be said that there is substantially no secondary aggregation. The porosity printed on the present invention by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economics means that the pores can be determined by the nitrogen adsorption method, and the pore volume should be above 0.1 ml / g, more preferably 0.5 ml / g the above. The average pore diameter of the porous material (the diameter is simply called diameter), although it is not limited, it is preferably 6 nm or more, more preferably 6 to 30 nm, and more preferably 6 to 18 nm. Although it varies depending on the application, substances with larger pore diameters and larger scales can easily enter the pores and it is better to diffuse faster. If the pores are small, moisture in the air, etc. may block the pores and block the flow of substances into the pores, which is not suitable. In particular, when used as an ink absorbing layer of an inkjet recording medium, in order to chemically maintain / stabilize the pigment in the ink, an average pore diameter of 6 to 18 nm which is close to the size of the pigment is preferable, and an ink absorbing layer having excellent light resistance can be obtained. . Uniform pore diameter refers to the soil whose average pore diameter is calculated from the pore diameter and the total pore volume (the amount of pores whose pore diameter can be measured by the nitrogen adsorption method is less than 5 Onm) obtained from the nitrogen adsorption isotherm. The 50% range contains porous materials with a total pore volume of 50% or more. It was confirmed by TEM that the pore system was uniform. -11-This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 20030122 A7 B7 V. Description of the invention (8) (Please read the precautions on the back before filling this page) Porous substances of the invention The average particle diameter measured by the dynamic light scattering method (the diameter after the straight is called simply) is preferably 10 to 400 nm, more preferably 10 to 300 nm, and more preferably 10 to 200 nm. When the porous substance is dispersed in a solvent or a binder, if the particle diameter is 200 nm or less, a more transparent substance can be obtained. In particular, when it is used as an ink absorbing layer of an inkjet recording medium, a printed matter with good color development and high color density can be obtained from a high transparency. When it is larger than 20 Onm, the transparency is lowered. When it is larger than 40 Onm, the concentration of the sol becomes higher, and then it becomes easier to settle, which is not suitable for use. Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The average aspect ratio of the present invention is between the average particle diameter and the average particle length of the primary particles. The larger 値 is divided by the smaller 値. The average particle diameter and average particle length of the primary particles can be easily obtained by observation with an electron microscope. Although it varies depending on the application used, only particles with an average aspect ratio of 2 or more in primary particles are coarser than particles made of particles with an average diameter smaller than 2. It can easily hold a large amount of material, and the diffusion is faster, which is more suitable. In particular, when used as an ink adsorption layer for a plug recording medium, the ink penetration can be improved. If the average aspect ratio is 2 or more, it is not limited, but if it is 5 or more, ink absorption and gloss are more suitable. Although the shape may be any of fibrous, needle-like, rod-like, plate-like, cylindrical, etc., the point of ink absorption is preferably needle-like or rod-like. The converted specific surface area Sl (m2 / g) calculated from the average particle diameter DL (nm) measured by the dynamic light scattering method is based on the assumption that the particles of the porous substance are spherical, and SL = 6x 103 / (density (g / cm3 ) X DL). The difference between the specific surface area SB and the nitrogen adsorption specific surface area SB measured by BET is 25 0m2 / g -12- This paper size is applicable to China National Standard (CNS) A4 (210X 297 mm) A7 B7 V. Invention Explanation (9) and above means that the particles of the porous substance are extremely porous. If this 値 is small, the ability to absorb substances into the interior becomes small. For example, when used as an ink absorbing layer, the amount of ink absorption becomes small, and the SB-SL is preferably below 1,500 m2 / g. If this ratio is large, the handleability may deteriorate. In the porous material of the present invention, a compound containing an organic chain can be bound. Examples of the compound containing an organic chain include a silane coupling agent and an organic cationic polymer. Silane coupling agent needs to be added to improve the bonding or adhesion with organic media. Further, particles having excellent chemical resistance such as alkali resistance can be obtained. Furthermore, even if it is acidic or a cationic substance or an organic solvent is added, a sol capable of withstanding long-term retention can be stably produced. The silane coupling agent used is preferably one represented by the following general formula (2).

XnSi (OR) 4-n In the formula, X is a hydrocarbon group having 1 to 12 carbon atoms, a hydrocarbon group having 1 to 12 carbon atoms substituted by a fourth-order ammonium group and / or an amine group, or a fourth-order ammonium group and The hydrocarbon group having 1 to 12 carbon atoms which can be substituted by an amine group is a group connected by a single or plural nitrogen atom, R represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, and η is an integer of 1 to 3. Examples of the "specific examples of R" include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, third butyl, pentyl, isopentyl, neopentyl, hexyl, Isohexyl, cyclohexyl, benzyl and the like are preferably alkyl groups having 1 to 3 carbon atoms, and fluorenyl and ethyl groups are most suitable. In X, specific examples of hydrocarbons having 1 to 12 carbon atoms include methyl paper, which is applicable to Chinese National Standards (CNS) A4 specifications (210 × 297 mm) (please read the precautions on the back #! This page), ·! Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 20030122. A7 B7 V. Description of the invention (10), ethyl, propyl, isopropyl, butyl, isobutyl, cyclohexyl 'benzyl And the like are particularly preferably methyl, ethyl, propyl, butyl, cyclohexyl, or benzyl. (Please read the precautions on the back before filling out this page.) Furthermore, among X, specific examples of hydrocarbon groups having 1 to 12 carbon atoms substituted with a fourth-order ammonium group and / or amine group can be given. Amine methyl, amine ethyl, amine propyl, amine isopropyl 'amine butyl, amine isobutyl, amine cyclohexyl, amine benzyl, and other amine ethyl, amine propyl, amine cyclohexyl, and amine benzyl Among them, amine ethyl, amine propyl, amine cyclohexyl, and amine benzyl are particularly preferred. In addition, among X, a hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a fourth-order ammonium group and / or an amine group is a group in which a single or plural nitrogen atom is connected, and the number of carbon atoms in the group is 1 to The hydrocarbon group of 12 is the same as described above. The number of nitrogen atoms attached to the hydrocarbon group which may be substituted by such a fourth-order ammonium group and / or amine group is preferably one to four. Specific examples of the compounds represented by the general formula (2) printed by the Employee Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs include, for example, methyltriethoxysilane, butyltrimethoxysilane, and dimethyldimethoxy Silane, aminopropyltrimethoxysilane (aminoethyl) aminopropyltrimethoxysilane, aminopropylmethyldiethoxysilane, aminobutyltriethoxysilane, 3- ( N-styrylmethyl-2-aminoethylamino) -propyltrimethoxysilane hydrochloride, aminoethylaminomethylphenethyltrimethoxysilane, 3- [2- ( 2-aminoethylaminoethylethylamino) propyl] trimethoxysilane and the like. As for the addition amount of the silane coupling agent, the weight ratio of the silane coupling agent and the porous substance is preferably 0.002 to 2, and more preferably 0.01 to 0.7. When the silane coupling agent contains nitrogen atoms, the weight ratio of nitrogen atoms in the dry weight of the porous material after the treatment (hereinafter referred to as the content rate) is 0.1 to 10%. Applicable to China National Standard (CNS) A4 specification (210X297 mm) 20030122. A7 B7 V. Description of the invention (11) 0.3 to 6%. If the content rate is low, it may become difficult to obtain the effects of the present invention. If the content rate exceeds 10%, there may be a lack of workability and other industrial rationalization. (Please read the precautions on the back before filling this page) As for the treatment method obtained from the silane coupling agent, it can also be directly added into the sol containing porous substances, or it can be dispersed in organic solvents in advance, in water and catalyst It is added after decomposing in the presence of water. As for the processing conditions, the temperature is from room temperature to below the boiling point of the aqueous dispersion, and it is preferably a few minutes to a few days, and more preferably 25 ° C to 55 ° C for 2 minutes to 5 hours. Examples of the organic solvent include alcohols, ketones, ethers, and esters. More specifically, alcohols such as methanol, ethanol, propanol, and butanol, and ketones such as methyl ethyl ketone and methyl isobutyl ketone can be used. Glycol ethers such as 2,2-methoxyethanol, 2-ethoxyethanol, propylene glycol monopropyl ether, glycols such as ethylene glycol, propylene glycol, and hexylene glycol, methyl acetate, ethyl acetate, lactic acid Esters such as methyl ester and ethyl lactate. The amount of the organic solvent is not particularly limited, but it is preferably an organic solvent! The weight ratio of the 1 / silane coupling agent is 1 to 500, and more preferably 5 to 50. As the catalyst, organic acids such as inorganic acids such as hydrochloric acid, nitric acid, and sulfuric acid, acetic acid, oxalic acid, and toluenesulfonic acid, or basic compounds such as ammonia, amines, and alkali metal hydroxides can be used. The amount of water required for the hydrolytic decomposition of the silane coupling agent printed by the employee's cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs is 0.5 to 50 mols of Si-〇R group which constitutes the silane coupling agent per mole. ~ 25 moles. In addition, the catalyst system is added to 0.01 to 1 mole for each mole of silica coupling agent, preferably 0.05 to 0.8 mole. The above-mentioned silane coupling agent is hydrolyzed, usually under normal pressure, the temperature below the boiling point of the solvent used should be -15 lower than the boiling point of -15-This paper size applies to Chinese national standards (CNS ) A4 specification (210X29? Mm) 20030122. A7 B7 V. Description of the invention (12) The temperature is carried out, but when using heat-resistant and pressure-resistant containers such as autoclaves, it can also be carried out at a temperature higher than this temperature. In addition, when an organic cationic polymer is bonded to the porous material of the present invention, when an ink absorbing layer is used as an inkjet recording medium, water resistance and permeability resistance after recording are improved. The organic cationic polymer is arbitrarily selected from known organic cationic polymers used in conventional ink jet recording media and used. In the present invention, as for the organic cationic polymer, it is preferably a polymer having a fourth-order ammonium base, and particularly preferably a homopolymer of a monomer having a fourth-order ammonium base or a copolymer that can be copolymerized with the monomer. The copolymer between one or two or more other monomers is particularly preferably one having a weight average molecular weight of 2,000 to 100,000. The weight ratio of the porous substance of the organic cationic polymer (organic cationic polymer / porous substance) is preferably in the range of 1/99 to 99/1. More preferably, it is in the range of 10/90 to 90/10. In the porous material of the present invention, hydrous metal oxides such as aluminum hydroxide, chromium hydroxide, and tin hydroxide or alkali metal chlorides such as basic aluminum chloride can be added. By adding the aforementioned compound 'to make it acidic and adding a cationic substance or an organic solvent, it is stable even when concentrated, and a sol capable of withstanding long-term storage can be produced. The weight ratio of the aforementioned compound to the porous substance (the aforementioned compound / porous substance) is preferably in the range of 1/99 or more and 50/50 or less. More preferably, it is in the range of 5/95 or more and 30/70 or less. The potential (Γ) of the porous substance should be above + 10mV or below _10mV. If the particle's other potential is outside the above range, the particle scale is applicable to the home standard (CNS) A4 rule f (2) 0x 297 mm) --- (Please read the precautions on the back first (Fill in this page)

1T printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 200301222 A7 B7 printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy Settling or agglutination. Sunda potential also changes with pH. Although it varies depending on the metal source or solvent, the surface modification caused by a silane coupling agent and the like can be used to control the pH. Even if an additive with a charge is added, it is stable and can produce a sol that can withstand a long period of time. By mixing a porous substance with a positive sunk potential and a porous substance with a negative sunk potential, it can be obtained that the porous substance has been connected and / or divided into a rosary. Although it also varies according to the purpose used, but the particles that have been connected and / or divided into a rosary shape are rough because of the microscopic particles, so it is easy to keep a large amount of material and it is better to diffuse faster. Particularly when used as an ink absorbing layer of an inkjet recording medium, the penetration of the ink can be increased. The following are examples. Modified from the surface of the silane-based coupling agent having an amine group, and added slowly in an acidic aqueous solution of a porous substance having a positive sunda potential while stirring the acidic aqueous solution of a porous substance having a negative sunda potential. As for the weight ratio of the porous substance having a negative sunda potential / the porous substance having a positive sunda potential, it is preferably 0.001 to 0.2, and more preferably 0.0 1 to 0.05. If the weight ratio is above 0.2, agglomeration or precipitation may occur, which is not suitable. The porous material in the present invention can be added with a calcium salt, a magnesium salt, or a mixture thereof. Even if calcium salt, magnesium salt, or a mixture of these is added, it is possible that the porous substance is connected and / or divided into rosary. In addition to the aforementioned effects, "g sheep love" is not clear, but suppresses the decomposition of pigments in the ink, etc., and improves local light resistance. For example, when selecting silicon dioxide as the metal source, Ming salt, magnesium salt or the like (please read the precautions on the back before filling this page)-The size of the paper is bound to the Chinese National Standard (CNS) Α4 specification (210X297 (Mm) -17- 20030122 Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, M Industrial Consumer Cooperative, A7 B7_V. Description of the invention (14) The mixture should be added as an aqueous solution. The amount of the calcium salt, magnesium salt, or mixture thereof added to the SiO 2 is preferably 1500 ppm or more, and more preferably 1,500 to 5,000 ppm, based on CaO, MgO, or both. The addition may be performed under stirring. Although the mixing temperature and time are not particularly limited, it is preferably about 2 to 50 ° C for 5 to 30 minutes. Examples of the added calcium salt and magnesium salt include calcium, magnesium, chloride, bromide, iodide, fluoride, phosphate, nitrate, sulfate, sulfamate, formate, and acetate And other inorganic acid salts, organic acid salts. These calcium salts and magnesium salts may be used in combination. The concentration of these salts to be added is not particularly limited, but may be about 2 to 20% by weight. Polyvalent metal components other than calcium and magnesium, such as calcium salts and magnesium salts, can be more suitably produced when they are contained in the colloidal aqueous solution of silica described above. Examples of the polyvalent metal other than calcium and magnesium include bivalent, trivalent, or tetravalent metals such as barium, zinc, titanium, hafnium, iron, nickel, and cobalt. As for the amount of these polyvalent metal components, when the added amount of calcium salt, magnesium salt, etc. is converted into the amount of CaO, MgO, etc., it is preferable that the CaO, MgO, etc. are polyvalent metal oxides. ~ 80% by weight. In the porous material of the present invention, it is preferable that it does not contain calcium, potassium, or a mixture thereof as much as possible. Although it is different depending on the application to be used ', when it is used at a high temperature, the amount of pores may decrease and the pore size may change. For example, when the porous substance is silicon dioxide, as for the amount of sodium, potassium, or a mixture thereof contained, the weight ratio of SiO2 to sodium, potassium, or both is preferably 1000 ppm or less. It is more preferably 200 ppm or less. As examples of sodium and potassium that have been included, metal, sodium, or potassium chlorides and bromide (please read the precautions on the back before filling this page)-binding-binding • paper size applicable to China Standard (CNS) A4 specification (21〇 &lt; 297 mm) -18- 20030122. A7 B7 V. Description of the invention (15) Substances, iodides, fluorides, phosphates, nitrates, sulfates, sulfamol Inorganic acid salts and organic acid salts such as salts, formate and acetate. (Please read the notes on the back before filling this page) In the sol of the present invention, the liquid is the dispersion medium, and the porous substance of the present invention is the colloidal solution of the dispersion. Regarding the dispersion medium, any one can be used as long as it does not cause precipitation. One or two or more mixed solvents of water, alcohols, glycols, ketones, and amidines are preferred. The organic solvent can be changed depending on the application. When accelerating the drying speed of the coating film, it is preferable that the latent heat of evaporation is lower than that of water such as alcohols or ketones. The latent heat of evaporation means that the solvent is easily vaporized. As for alcohols, lower alcohols such as ethanol or methanol are preferred, and ketones are preferably methyl ethyl ketone. When determining the smoothness of the coating film, it should be a high boiling point solvent with a boiling point of 100 degrees or more, especially ethylene glycol, ethylene glycol monopropyl ether, dimethylacetamide, xylene, and n-butanol. Methylene isobutanone. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, in order to prevent the aggregation of particles, it contains metal hydroxides such as NaOH, organic bases or NH4OH, and low molecular polyvinyl alcohol (hereinafter referred to as low molecular PVA) Stabilizing agents such as surfactants are preferred. Especially preferred are alkali metal hydroxides, NH4OH or organic bases. When a stabilizer has been added to the sol, the porous substance does not precipitate or gel, and can be stabilized over a long period of time, so it is more suitable. As for the amount of stabilizer to be added, it is preferably IX 10-4 to 0.15, more preferably 1x10-3 to 〇〇, and more preferably 5x 1 (Γ3 ~ 0.05. If the stabilizer is 1X 10_4 or less, the charge rebound of the porous substance becomes insufficient, and it is difficult to maintain long-term stability. If the stabilizer is more than the above, the electrolyte with a necessary amount or more will increase, and the It is easy to gel, so it is not quite suitable. It is also possible to include a viscosity adjuster for the § ## of the whole gluten gum. The viscosity adjustment paper size applies the Chinese National Standard (CNS) Α4 specification (210X 297 mm) ~ &quot; 2U030122: Printed by A7 B7 of the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (16) The whole agent means the substance that changes the viscosity. As for the viscosity adjusting agent, it is preferably sodium salt or ammonium salt. Especially suitable Choose from any one or more of Na2S03, Na2S04, NaCl, NH3HC03. As for the amount of viscosity modifier added, based on the weight ratio of the porous material with viscosity adjusted, it is preferably 5x 1CT5 ~ 0.03, and more preferably lx 1 〇_4 ~ 〇.〇1, more preferably 5x 10 · 4 ~ 5x 10_3. If the viscosity adjusting agent is 5χ 1 (Γ5 or less, the effect of viscosity change is small, and if the viscosity adjusting agent is 0.0 3 or more, the amount of electrolyte above the necessary amount will increase, which will also impair the storage stability of the sol, and Not suitable. The concentration of the sol varies depending on the application, but it is preferably 0.5 to 30% by weight, more preferably 5 to 30% by weight. If the concentration is too low, it will be economically disadvantageous, and it will be used for coating. It has the disadvantages that it is difficult to dry, etc., and it is not good from the point of transportation. If the concentration is too high, the viscosity will increase, and the stability may decrease. It is not suitable for the sol of the present invention. It is preferable that the metal source and model made of metal oxide and / or its precursor, and the step of manufacturing a metal oxide / model composite sol with water, and the manufacturing method produced by the step of removing the model from the composite are suitable The metal source used in the present invention is a metal oxide and / or a precursor thereof. As for the metal species, examples thereof include alkaline earth metals such as silicon, group II magnesium and calcium, zinc, group III aluminum, potassium, and rare earths. , Four groups of titanium, osmium, etc., five groups of Phosphorus, vanadium, group VII manganese, association, etc. Group VIII iron, cobalt, etc. As for the precursor, examples of these metals include nitrates, hydrochlorides, inorganic salts, acetates, naphthenates, etc. Organic acid salts, organometallic salts such as organic aluminum salts, anchor oxides, and ammonia oxides are not subject to this national standard (CNS) Α4 specification if they can be synthesized in accordance with the synthesis method described below. 210X297 mm ------ (Please read the notes on the back before filling out this page} -Installation ·. «Line 20030122: A7 B7 5. Limited by invention description (17). Of course, these may be used alone or in combination. Please read the back &amp; 5 When the consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs prints and selects silicon as the metal, it can be repeatedly condensed or polymerized to eventually become silicon dioxide. It should be used alone or in combination with tetraethoxylate. Alkyl silanes or alkoxides such as methyltriethoxysilane, dimethyltriethoxysilane, 1,2-bis (triethoxysilyl) ethane, or activated silicon dioxide. Activated dioxide is particularly cheap and safe. The active silica used in the present invention is extracted from water glass with an organic solvent, and ion-exchanged water glass can be prepared. For example, when water glass is brought into contact with an H + -type cation exchanger and prepared, Na is less and less expensive. Therefore, it is industrially appropriate to use water glass No. 3. As for the cation exchanger, for example, a sulfonated polystyrene divinylbenzene-based strong acid exchange resin (for example, manufactured by Rohm Haas, Amberlite IR-120B) and the like are not particularly limited. In addition, when adjusting the active silica, an aluminate can also be added to the water glass. It is possible to use a mixture of silicon dioxide and aluminum oxide obtained without precipitation even if the concentration is increased. The addition amount of aluminate and alkali, the Si / A1 element ratio in the mixture of silica and alumina is preferably 200 ~ 1500. More preferably, it is in the range of 300 to 1,000. When the Si / A1 element ratio is larger than 1,500, precipitation becomes liable to occur when the concentration is increased. If the Si / A1 element ratio is longer than 200 hours, fine pores may not be formed when the model is removed. As for the alkali aluminate used, although sodium aluminate, potassium aluminate, lithium aluminate, ammonium aluminate, guanidine aluminate, etc. can be used, it is preferably sodium aluminate. The Na / Al element ratio in sodium aluminate is preferably 1.0 to 3.0. Although the model used in the present invention can be cationic, anionic, non-ionic, amphoteric surfactant or dodecylamine, such as quaternary ammonium, 14-21-this paper size applies to Chinese National Standards (CNS) A4 specification (210 X 297 mm) 20030122. Α7 Β7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (18) Amines or amine oxides such as alkylamines, cetylamines, and stearylamines Neutral models, etc. can also be used, but we are Adeca prulonic LPFR series triblock made by Asahi Kasei Corporation or Adeca PEG series polyethylene glycol Adeca pronic TR series ethylene diamine manufactured by Asahi Kasei Corporation Nonionic surfactants such as test bases. As for the nonionic surfactant, it is possible to use R0 (C2H40) a- (C3H60) b- (C2H4〇) eR (a and c are 10 to 110 each, b is 30 to 70, R A triblock nonionic surfactant made of ethylene oxide and propylene oxide represented by a hydrogen atom or an alkyl group having a carbon number of U2. It is particularly suitable to use the structural formula HO (C2H40) a- (C3H60) b · (C2H40) cH (except that a and c are each 10 to 110 and b is 30 to 70), or the structural formula R (OCH2CH2) nOH (where R represents an alkyl group having 12 to 20 carbon atoms, and η represents 2 to 30). Specific examples include Prulonic P103 (HO (C2H40) 17- (C3H6〇) 6〇- (C2H4O) 17H), manufactured by Asahi Denka Corporation), P 1 2 j (Ο 〇 (C 2 Η 4 Ο) 2 ο-(C 3 HU Ο) 7 ο-(C 2 Η 4 〇) 2 ο Η), P85, etc. or polyethylene oxide lauryl ether, polyethylene oxide cetyl ether, polyethylene oxide Alkyl stearate and the like. In order to change the pore size, as for organic additives, aromatic hydrocarbons having 6 to 20 carbons, alicyclic hydrocarbons having 5 to 20 carbons, aliphatic hydrocarbons having 3 to 16 carbons, and these amines can be added. Substituted with halogen, such as toluene, trimethylbenzene, triisopropylbenzene and the like. Hereinafter, the manufacturing method of this invention is demonstrated. Reactions of metal sources and models, such as those that dissolve or disperse the metal source in the solvent and those that dissolve or disperse the model in the solvent can be mixed after mixing. Please read the back &amp; 5

This paper size applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) -22- 20030122. A7 B7 5. The invention description (19) is carried out, but it is not limited by these. As for the solvent, although any of water or a mixed solvent of water and an organic solvent may be used, the organic solvent is preferably an alcohol. As for alcohols, lower alcohols such as ethanol or methanol are preferred. (Please read the notes on the back before filling out this page.) Although the composition used in these reactions varies depending on the model, metal source, and solvent, it will generate agglomeration or precipitation, etc. It is necessary to choose a range with a relatively small particle diameter. To prevent particle aggregation or precipitation, a stabilizer such as a base such as NaOH or a low molecular weight PVA may be added. When it is in a range that does not cause aggregation or precipitation, a pH adjuster, a metal blocking agent, a mold inhibitor, a surface tension adjuster, a wetting agent, and a rust preventive agent may be added to the solvent. For example, when active silicon dioxide is used as the metal source, Prulonic P123 is used as the model, and water is used as the solvent, the following composition can be used. As for the weight ratio of P123 / Si02, it is preferably from 0.01 to 30, and more preferably from 0.1 to 5. The weight ratio of the organic additive / P123 is preferably 0.02 to 100, and more preferably 0.05 to 35. The weight ratio of water / P 123 during the reaction is preferably in the range of 10 to 1,000, and more preferably in the range of 20 to 500. As for the stabilizer, NaOH lx 10 · 4 to 0.15 may be added in a weight ratio of Na0H / Si02. When PrulonicP103 is used, the same composition can also be used. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The metal source, model, and solvent should be mixed at 0 ~ 80 ° C, and more preferably at 0 ~ 40 ° C. The adding time in the present invention means the time required for the addition of the metal source to the model solution or the addition of the model solution to the metal source from the beginning to the end. Adding time should be more than 3 minutes, more preferably 5 minutes or more. If the adding time is less than 3 minutes, the average aspect ratio of the primary particles becomes less than 2 -23- This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) 20030122- A7 B7 Intellectual property of the Ministry of Economic Affairs Printed by the Bureau's Consumer Cooperatives 5. Description of the Invention (20) 'When used as an ink absorbing layer for inkjet recording media', the amount of ink absorption may decrease. Adding time can be controlled according to the adding speed of the metal source or model solution. If the addition speed is substantially constant, the average aspect ratio of the primary particles or the reproducibility of the average particle diameter is good, so although it is preferable, it is not necessarily fixed. Although the reaction can be carried out at normal temperature, if necessary, it can also be carried out under heating at a temperature of up to 1000 ° C. However, hydrothermal reaction conditions above 1 oo ° C are not required. As for the reaction time, a range of 0.5 to 100 hours, preferably 3 to 50 hours, is used. The pH during the reaction is preferably from 3 to 12, more preferably from 6 to 11, and more preferably from 7 to 10. For example, when silicon is selected as the metal, if the pH is adjusted to 7 to 10, the reaction time may be shortened. To control the pH, bases such as NaOH and ammonia or acids such as hydrochloric acid, acetic acid, and sulfuric acid may be added. When manufacturing porous sols, aluminate and alkali can also be added, but this period is before and after the formation of the complex, and any period after removing the model. When the composite system contains silicon, it is necessary to add aluminate and alkali, even if It can be made acidic and stable by adding a cationic substance, and a sol that can withstand long-term storage can also be produced. As for the aluminate used, sodium aluminate, potassium aluminate, lithium aluminate, ammonium aluminate, guanidine aluminate, etc. can be used, but sodium aluminate is preferred. The Na / Al element ratio in sodium aluminate is preferably 1.0 to 3.0. The following is an example when adding an aluminate-alkali solution after removing the model (please read the precautions on the back before filling this page). The binding and paper size are applicable to the Chinese National Standard (CNS) A4 specification (210X 297). (Chu) -24- 20030122 A7 _____B7 V. Description of the invention (21) (Please read the notes on the back before filling in this page) It is stated that the addition of aluminate solution is between 0 ~ 8 (TC, preferably 5 ~ 40 ° c. Mix and carry out. Although the concentration of the added aluminate and alkali is not particularly limited, it is preferably used at 0.5 to 40% by weight, and more preferably 1 to 20% by weight. The added amount is, for example, a porous substance. When the sol contains silicon, it is preferably 0.003 to 0.1, and more preferably 0.005 to 0.05, in terms of the AI / (Al + Si) element ratio. After the addition, it is heated at 40 to 95 ° C, and at 6 〇 ~ 80 ° C heating is more suitable. Next, the method of removing the model will be explained. For example, the composite obtained by filtration is filtered, washed, and dried, and then the contained model and a solvent such as a supercritical fluid or an alcohol are used. It can also be removed by methods such as contact or firing, and porous materials can also be obtained. The temperature is higher than the temperature at which the model disappears, and is generally above 500 ° C. Although the relationship between the firing time and the temperature can be appropriately set, it is about 30 minutes to 6 hours. As for other removal methods, there are also The method of stirring and mixing the solvent and the complex, or the method of filling the complex to a layer column, and circulating the solvent is printed. Printed by the Industrial and Industrial Consumers Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, and adding a solvent such as alcohol to the obtained reaction solution and By removing the model from the composite, a porous material can be obtained. At this time, if an ultrafiltration device is used, it is better to handle the porous material while maintaining the sol. Ultrafiltration is pressurized and reduced outside the atmospheric pressure. Any one can be used. As for the material of the ultrafiltration membrane, Jushuo, polyetherketone 'polyacrylonitrile (PAN), polyolefin, cellulose, etc. can be used, and its shape can be hollow yarn type or flat membrane type Any of spiral, tube, etc. As for the material of the ultrafiltration membrane, it is preferably a hydrophilic membrane such as a PAN membrane, a cellulose membrane, a charged membrane, etc. In the charged membrane, there are a positively charged membrane and a charged membrane. As for positive charge , Can be listed in Jushuo, Polyether Shuo, Polyamine, Polyolefin and other organic polymers. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) ~ ΓΓ &quot; &quot; '200301222 A7 _ B7_ V. Description of the invention (22) or a film in which a positively-charged group such as a quaternary ammonium base is introduced into an inorganic substance. As for the charge-charged film, a load-charged electrode in which a carboxyl group or a sulfonic acid group is introduced into an organic polymer or inorganic substance (Please read the precautions on the back before filling this page) When performing ultrafiltration, in order to prevent the aggregation of particles, you can also add a stabilizer such as NaOH or low molecular weight PVA, or add sodium salts such as Na2S03 or A viscosity modifier such as an ammonium salt of NH3HC03 may be used. The solvent used for removal is only required if it dissolves the model, and it is only required if it is water that is easy to handle or an organic solvent with high solubility of the model. The pH of the sol during the removal of the model is preferably performed in a range of 7 to 12, and more preferably performed in a range of ρΗδ to 11. To control the pH, an alkali such as NaOH or ammonium or an acid such as hydrochloric acid, acetic acid, or sulfuric acid may be added. If the pH is too high, the structure of the porous material may be changed. If the pH is too low, there is a possibility of agglomeration, which is not suitable. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The removal temperature should be cooled to below the cell formation temperature of the model. The model is dissociated by cooling to a temperature below the cell formation temperature, and bends to easily pass through the filter membrane. Here, the so-called cell formation temperature is the temperature at which the model starts to form cells when the temperature rises at an arbitrary concentration. It depends on the solvent or model actually used, but it should be below 60 ° C, more preferably 0 ~ 2 0 t. If the temperature is too low, freezing of the solvent is not appropriate. When the porous substance is a metal oxide, if the aforementioned silane coupling agent is added to the obtained reaction solution, the surface hydroxyl group and the silane coupling agent react, and the model is released from the complex. If the pH is adjusted to near the isoelectric point (the absolute difference between the isoelectric point and the pH is within 1.5), the electrical bounce between the particles will become smaller, and the porous material will agglomerate. Centrifugal separation or smelting will be performed. Easier to go to -26- This paper size applies Chinese National Standard (CNS) A4 specification (210X 297 mm) 20030122. A7 B7 V. Description of invention (23) Except model. After removing the model, if the pH is adjusted away from the isoelectric point, a porous substance with an average particle diameter of 10 to 400 nm that is not substantially secondary agglomerated can be obtained. (Please read the precautions on the back before filling this page). The pre-removed model is used to remove the solvent for reuse. Compared with the removal method using incineration, reuse of industrial scale can reduce the cost of raw materials. It also does not generate heat from incineration and does not waste resources, so it is suitable for solving environmental problems. As for the reuse method, if the model is not decomposed, any method may be used, for example, heating the model solution removed by ultrafiltration to a temperature above the cell formation temperature. 'Using ultrafiltration and membranes with smaller molecular weights, It can be concentrated and used. As for the super membrane used in this case, a hydrophilic membrane is preferred. The solvent may be removed by distillation. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs As for the method of concentrating the sol, for example, when the viscosity of the sol is high, distillation is more effective than ultrafiltration, so it is more suitable. Although distillation. If it is not sinking or gelling, any method can be used, but from the point of sol stability and distillation efficiency, vacuum distillation is preferred. The range of the heating temperature during the distillation is preferably 20 to 100 ° C, and more preferably 20 to 45 ° C. As for the concentrating method, it is preferable to newly add a porous substance sol equivalent to the amount of the evaporated solvent. If the method of generally keeping the liquid surface fixed and concentrated is used, the drying of the sol near the liquid surface is suppressed, so it is more suitable. . For example, a rotary filter, a rotary evaporator, and a thin-film evaporator can be used. Concentration by the distillation method may be carried out alone, or combined with ultrafiltration may be used. When used in combination with ultrafiltration, it may be performed before and / or after ultrafiltration, but it is preferable to reduce the amount of the evaporated solvent and to perform it after ultrafiltration. Before the distillation, it is more difficult to cause precipitation or gelation, so I added an stabilizer and a silicon-27- This paper size applies the Chinese National Standard (CNS) A4 specification (2) 0X297 mm 20030122. A7 B7 V. Description of the invention (24) It is suitable for treating porous materials such as alkane coupling agent. (Please read the precautions on the back before filling this page.) The method of removing the solvent from the sol and preparing the porous material can be heat drying or vacuum drying, spray drying, supercritical drying and other methods. The porous substance and / or the sol of the porous substance of the present invention may be modified in various ways depending on the application. For example, a metal such as platinum or palladium may be supported. It is more suitable to mix colloidal silicon dioxide and other silicon dioxide in the sol of the porous substance to increase the solid content concentration in the sol. In addition, it is preferable to apply this pre-mixed liquid to increase the thickness and strength of the film compared to when the film is applied alone. Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The porous substance of the present invention has fine pores, which can absorb the substance inside, and it is also covered and protected, and released slowly. For example, it can be used as an adsorbent for a heat pump, a humidity control agent, a catalyst, a catalyst support, an ink absorbent, a pharmaceutical support for a pharmaceutical delivery system, a cosmetic, a food, and a dye. Because they are fine particles, they can also be used in areas where transparency or smoothness is required. For example, rubber or resin, paper fillers, tackifiers for paints, shakers, anti-settling agents, and anti-adhesives for films can be used. Furthermore, since the density is low due to being transparent and having fine pores, a low-refractive-index film, an antireflection film, a low-dielectric-constant film, a hard coating film, a heat-insulating material, and a sound-insulating material can also be used. In particular, a transparent and smooth film can be formed, and the absorption effect of substances caused by pores can be exerted, and a recording medium for photographic inkjet can be suitably used. Hereinafter, a case where it is used as an inkjet recording medium will be described. As for the ink used for inkjet, the pigment may be either a dye or a pigment, and the solvent may be either an aqueous or non-aqueous solvent. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -28- 20030122. A7 B7 V. Description of the invention (25) In the present invention, the inkjet recording medium is composed of a support and a support provided on the support. It is composed of at least one ink absorbing layer. If necessary, two or more ink absorbing layers may be provided. As described above, by multi-layering the ink absorbing layer, functions such as glossiness can be shared among the layers. The porous material of the present invention needs to be contained in at least one layer. Although the content of the porous substance of the present invention is not particularly limited, the respective ink-absorbing layers contained in the porous substance are preferably contained in an amount of 10 to 99% by weight. In addition, it is preferable that the entire ink absorbing layer contains 1 to 99% by weight, and if the content rate is low, the ink absorbency is lowered, which is not suitable. In the ink absorbing layer of the present invention, an organic adhesive can be used as an adhesive that does not impair the ink absorbency of the porous material. For example, polyvinyl alcohol (hereinafter referred to as PVA) and its derivatives can be exemplified. Polyvinyl acetate, polyvinyl pyrrolidone, polyacetal, polyurethane, polyvinyl butyral, poly (methyl Based) Acrylic esters, polyamidoamines, polyacrylate polyamidoamines, polyester resins, urea resins, melamine resins, starches and starch derivatives derived from natural polymers, carboxymethyl cellulose, hydroxyethyl, etc. Cellulose derivatives, casein, gelatin, latex, emulsion, etc. As for the latex, for example, vinyl acetate polymer latex, styrene isoprene copolymer latex, ethylene-butadiene copolymer latex, methyl methacrylate butadiene copolymer latex, and acrylate copolymer can be exemplified. Latex, functional group modified polymer latex modified with monomers containing functional groups such as carboxyl groups, and modified such copolymers. As for the PVA derivative, cation-modified polyvinyl alcohol, sarcohol-modified polyvinyl alcohol, and the like can be exemplified. Of course, these adhesives can also be used in combination. This paper size applies to Chinese National Standard (CNS) A4 specifications (210X 297 public attack) (Please read the precautions on the back before filling this page). · Printed by the--Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Consumption Cooperative, printed 30030122. A7 B7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (26) Although the content of the organic binder used in the present invention is not particularly limited, for example, when polyvinyl alcohol is used, the porous substance is 100 weight. The content is preferably divided into 5 to 40 weight, and the content is preferably contained to 5 to 100 weight. When the content is small, the film-forming property is reduced, and when it is large, the ink absorbability is reduced, so it is not suitable. In the present invention, there is also provided an inkjet recording medium coating liquid comprising an ink absorbing layer constituent component and a solvent. Although the solvent to be used is not particularly limited, it is preferable to use a water-soluble solvent such as alcohol, ketone, and ester, and / or water. Furthermore, a pigment dispersant, a thickener, a flow regulator, a defoamer, a foam inhibitor, a release agent, a foaming agent, a colorant, and the like may be blended in the coating liquid as necessary. In the present invention, it is preferable that at least one layer of the ink absorbing layer contains a cationic polymer. By including a cationic polymer, the water resistance of the printing portion can be improved. As for the cationic polymer, if it is cationic, it is not particularly limited, but it contains a first amine, a second amine, a third amine substituent, and a salt thereof, a quaternary ammonium salt substituent. At least one of them is preferred. Examples include difluorenyl diallyl ammonium chloride polymers, dimethyl difine propyl fe: -propyl chloride, fluorene amine copolymers, triamine polymers, polyamine dicyano polymers, polyamines Allylamine hydrochloride and the like. Although the molecular weight of the cationic polymer is not particularly limited, it is preferable to use a weight-average molecular weight of 10,000 to 20,000. In the present invention, at least one layer of the ink absorbing layer is preferably an ultraviolet absorber, a restricted amine light stabilizer, a singlet oxygen quencher, and an antioxidant. By including this substance, the light resistance of the printed portion can be improved. As for the ultraviolet absorber, although it is not particularly limited, benzotriazole-based, benzophenone-based, and titanium oxide are more suitable (please read the precautions on the back # | Fill this page first) The Zhang scale is applicable to the Chinese National Standard (CNS) A4 specification (21〇χ 297 mm) -30- 30i222 A7 --- B7 V. Description of the invention (27), hafnium oxide, zinc oxide, etc. As for the restricted fluorene stabilizer, although it is not particularly limited, it is more suitable to use an NR atom of the piperidine ring as NR (R is a hydrogen atom, an alkyl group, a benzyl group, an allyl group, an ethyl fluorenyl group, an alkoxy group, a ring Hexyl, benzyloxy). As for the singlet oxygen quencher, although it is not particularly limited, aniline derivatives, organic nickel-based, spiro-coumarin, and spiro-indan-based are more suitable. As for the antioxidant, although not particularly limited, phenol-based, hydroquinone-based, organic sulfur-based, phosphorus-based, and amine-based are more preferably used. It is preferable that at least one layer of the ink absorbing layer of the present invention contains an alkaline earth metal compound. The light resistance is improved by containing an alkaline earth metal compound. As for the soil metal compounds, the method of using the oxides, halides, and hydroxides of the town, bell, and barium to contain the alkaline earth metal compounds in the ink absorbing layer is not particularly limited. It can also be added to the coating liquid slurry to synthesize inorganic porous materials, or it can be added after the synthesis, and it can be contained and used. The amount of the alkaline earth metal compound to be used for the inorganic porous material is preferably from 0.5 to 20 parts by weight. The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed this invention. At least one layer of the ink absorbing layer should contain a non-ionic surfactant. By containing a non-ionic surfactant, the image quality, light resistance and Non-ionic surfactants, although not particularly limited, are preferably higher alcohols, ethylene oxide adducts of carboxylic acids, ethylene oxide propylene oxide copolymers, and ethylene oxide propylene oxide Copolymers are preferred. The method for including a nonionic surfactant in the ink absorbing layer is not particularly limited. It can also be added to the coating liquid slurry, and it can also be added to the inorganic porous material during synthesis or after synthesis, and it can be added and used. In the present invention, at least one layer of the ink absorbing layer is preferably an alcohol compound-31-This paper size is applicable to the Chinese National Standard (CNS) A4 specification (2) 0X297 mm 20030122 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7_V. Description of the invention (28). By containing an alcohol compound, image quality and light resistance can be improved. As for the alcohol compound, although not particularly limited, aliphatic alcohols, aromatic alcohols, polyhydric alcohols, and hydroxyl-containing oligomers are preferably used, and polyhydric alcohols are more preferably used. The method for containing the alcohol compound in the ink absorbing layer is not particularly limited. It can also be added to the coating solution slurry, synthetic inorganic non-porous substances, or after synthesis. In the present invention, at least one layer of the ink absorbing layer is preferably alumina hydrate-containing. By containing alumina hydrate, image quality and water resistance can be improved. As for the alumina hydrate, it is not particularly limited. Although boehmite structure, pseudo-boehmite structure, and amorphous alumina hydrate can be used, it is preferable to use oxide boron hydrate with pseudo-boehmite structure. . In the present invention, at least one layer of the ink absorbing layer preferably contains colloidal silica and / or dry silica. By containing colloidal silica and / or dry silica, the quality of the day can be improved and gloss can be imparted. The colloidal silica is not particularly limited, and it is a cationic colloidal silica gel obtained by a method of reacting a general anionic colloidal sand dioxide, a polyvalent metal compound such as aluminum ion, and the like. As for dry silicon dioxide, although it is not particularly limited, a gas phase silicon dioxide system synthesized by burning silicon tetrachloride by hydrogen and oxygen is more suitable. It is also possible to use the dry-type silicon dioxide system as it is, or to modify the surface with a silane coupling agent or others. In the present invention, a gloss layer may be provided on the outermost layer. The means for providing the gloss layer is not particularly limited, but a method containing superfine particle size pigments such as colloidal sand dioxide and / or dry silica may be used, such as a supercalendering method, a calendering method, or a casting method. (Please read the precautions on the back before filling out this page) The size of the binding and binding paper is applicable to the Chinese National Standard (CNS) A4 specification (210/297) | System 5. Description of the invention (29) Although the support used in the present invention is not particularly limited, it is preferable to use paper, polymer sheets, polymer films, and cloth. These supports may also be subjected to surface treatments such as corona discharge as necessary. The thickness of the ink absorbing layer is not particularly limited, but it is 1 to 100 // m, and the coating amount is preferably 1 to 100 g / m2. Although the coating method is not particularly limited, a knife coater, an air knife coater, a roll coater, a brush coater, a curtain coater, a bar coater, a gravure coater, a sprayer, etc. may be used. <Examples> Examples are given below to specifically explain the present invention. The pore distribution and specific surface area were measured using Autosorp 1 manufactured by Kante * chrome, and measured with nitrogen. The pore distribution was calculated by the BJH method. The average pore diameter was calculated from the peak 値 in the mesopore area of the differential pore distribution curve obtained by the BJH method. The specific surface area was calculated by the BET method. The average particle diameter and the solar potential obtained by the dynamic light scattering method were measured using a laser solar potentiometer ELS-800 manufactured by Otsuka Electronics Corporation. The viscosity was measured with a viscometer LVDV11 + manufactured by Brook Field, and the spindle system was measured at a temperature of 25 ° C using a small number of samples No. 21 exclusively. TEM irradiation was performed using H-7 100 manufactured by Hitachi. The coating film is coated with a porous material: PVA-1 17 (manufactured by Kurare) ·· PVA-R1130 (manufactured by Kurare) = 100: 10: 20 (solid content) The coating liquid is made into a transparent PET film (Toray) Manufacturing, (please read the precautions on the back before filling this page) Binding and binding. #The size of the paper is applicable to China National Standard (CNS) A4 (210X 297 mm) -33- 20030122. A7 B7 V. Invention Instructions (30)

Lumilar Q 80D). As for the means for measuring the film strength, pencil strength was used. That is to say, based on the strength test of the wrong pen (Π SK 5 4 0 0), use the pencil lead to sharpen and check the cracking degree of the coating. Take the pencil hardness mark (6B-9H) below the pencil where the crack is found to be Pencil hardness. The evaluation of the printing characteristics was performed by using a commercially available inkjet printer (PM-8 00 C manufactured by Seko Epson) for the coating film, and using full-color printing in yellow, magenta, cyan blue, and black. Ink absorbency is determined by the degree of ink transfer as the bleeding of the ink after printing and the imprinting of the printing portion with white paper immediately after printing. 〇: Good, X: Inferior Water resistance is evaluated by dropping a drop of pure water onto the printed portion of the coating film, and judging by the degree of ink bleeding and outflow after drying. 〇: Good, △: Slightly acceptable, X: Evaluation of poor light resistance is based on Canonfadeometer Ci-3000F (manufactured by Toyo Seiki), with S-type polysilicate inner filter, soda lime outer filter, temperature 24 ° C, The printed film was irradiated under the conditions of a humidity of 60% RH and an irradiance of 0.80 W / m2. The optical density of each color before and after irradiation for 60 hours was measured, and the change rate of the density was determined. The optical density was measured using a reflection densitometer (Gretagmacbeth, RD-918). 〇: Good, △: Slightly acceptable, X: Inferior The evaluation results of the coatings and sols of the following examples are shown in Tables 1 and 2 〇 (Please read the precautions on the back # 'Fill this page first)

1T Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperatives This paper is printed in accordance with the Chinese National Standard (CNS) A4 specification (210 × 297 mm) -34- 20030122 A7 B7 Explanation (31) [Example 1] Disperse 1 000 g of cation exchange resin (Amberlite, IR-1 2 0B) H + in advance in 1 000 g of water, and add 666,7 g of water No. 3 water glass ( Si02 = 29% by weight, Na20 = 9.5% by weight. / 〇) 3 3 3.3 g of solution. After sufficiently stirring this, the cation exchange resin was filtered off to obtain 2000 g of an active silica aqueous solution. The Si02 concentration of this active silica solution was 5.0% by weight. 100 g of Prulonic P123 was dissolved in 8700 g of water and stirred in warm water at 35 ° C. At the same time, 1 200 g of the above-mentioned active silica aqueous solution was added at a constant addition rate within 10 minutes. The pH of this mixture was 4.0. At this time, the weight ratio of water / P123 was 98.4, and the weight ratio of P123 / Si02 was 1.67. After stirring the mixture at 35 ° C for 15 minutes, it was left to stand at 95 t for 24 hours. In the obtained reaction solution, an aqueous NaOH solution was added so that the added water / alcohol was 1 / 0.79 by weight, and Na0H / Si02 was 0.045 / 1 by weight. The pH of this solution was 9 · 0. This solution was filtered using a PAN membrane AHP-0013 (manufactured by Asahi Kasei Co., Ltd.) as an ultra-thorium membrane to remove the non-ionic surfactant P123, and a sol (A) of transparent porous material having a concentration of SiO 2 of about 7.0% by weight was obtained. The pH was 10.0 and the sunda potential was -45mV. The viscosity of this sol (A) was 3 60 cP. The average particle diameter measured by the dynamic light scattering method of the sample in this sol (A) was 13.6 m2 / g in terms of 200 nm in terms of specific surface area. The sol was dried at 105 ° C to obtain a porous substance. The average pore diameter of this sample was 1 Onm, and the pore volume was 1. Π m 1 / g. The nitrogen adsorption specific surface area measured by the BET method was 54 m2 / g, and the difference from the converted specific surface area was 526.4 m2 / g. This sample (please read the precautions on the back before filling out this page) -Packing · ·> The size of the thread paper is applicable to China National Standard (CNS) Α4 specification (210X 297 mm) -35- 20030122 Intellectual Property Bureau of the Ministry of Economic Affairs Printed by employee consumer cooperatives A7 ___ B7 V. Description of the invention (32) When the primary particles are observed by an electron microscope, the average particle length is 200 nm and the rod-shaped particles have an average aspect ratio of 6.7. When the obtained sol (A) was used as a coating film, it was dried at room temperature for about 10 minutes to obtain a film having a film thickness of 18.0 ± 2.0 / m and a pencil strength of HB. [Example 2] A 0.1 N NaOH aqueous solution was added to the mixture of SiO 2 &amp; P123 obtained in Example 1 to adjust the pH to 9.5. After stirring and reacting at 65 ° C for 3 hours, the same operation as in Example 1 was carried out to obtain the same one as the sol (A). [Example 3] A 100% by weight aqueous solution of calcium nitrate was added to 100 g of the sol (A) obtained in Example 1 at room temperature with stirring. After stirring at room temperature for 30 minutes, the pH was 9.9. When the primary particles of this sample were observed with an electron microscope, rod-shaped particles with an average particle diameter of 30 nm and an average particle length of 200 nm were connected to form an average of 10 beads. The obtained sol (B) was used as a coating film. [Example 4] A 10% by weight magnesium chloride aqueous solution was added to 100 g of the sol (A) obtained in Example 1 at room temperature with stirring. After stirring at room temperature for 30 minutes, the pH was 9.8. If the primary particles of this sample are observed by an electron microscope, rod-shaped particles with an average particle diameter of 30 nm and an average particle length of 200 ηη (please read the precautions on the back before filling this page) The paper size applies to Chinese national standards ( CNS) A4 specification (210X297 mm) -36- 20030122 kl B7 V. Description of the invention (33) Made of rosary beads with an average of 10 degrees. The resulting sol (B is coated. Please read the precautions for δ first [Example 5] 3- (2-aminoethyl) amino group was added to 100 g of sol (A) obtained in Example 1. 0.51 g of propylmethoxysilane. After sufficiently stirring, 1.36 g of 6N hydrochloric acid was added. Although nodular aggregates were temporarily formed, when dispersed with an ultrasonic disperser, a sol (D) was obtained. p Η is 2.1, or other potential is 34 mV. The obtained sol (D) is made into a coating film. [Example 6] A 6N sodium hydroxide aqueous solution was added to the sol (D) obtained in Example 5. The pH was adjusted to 10.0. Although nodular agglomerates were temporarily generated, when they were dispersed using an ultrasonic disperser, a sol (E) was obtained. The potential was -45 mV. The obtained sol (E) was made into a coating film. [Example 7] Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs

To 100 g of the sol (A) obtained in Example 1 was added 40% methanol of 3- (N-styrylmethyl-2-aminoethylamino) -propyltrimethoxysilane hydrochloride. Solution 2.1 4g. After thoroughly stirring this, 3.5 g of 6N hydrochloric acid was added. Although nodular aggregates are temporarily generated, when a ultrasonic disperser is used for dispersion, a sol (F) can be obtained. The pH was 1.1 and the sunda potential was 3 8 mV. The obtained sol (F) was made into a coating film. -37- This paper size is in accordance with Chinese National Standard (CNS) A4 specification (210X297 mm) 20030122. A7 B7 V. Description of the invention (34) [Example 8] The sol (D) obtained in Example 5 was 100g The internally stirred sol (A) 3. Og obtained in Example 1 was added slowly. The pH was 2.5. If the primary particles of this sample are observed by an electron microscope, rod-shaped particles having an average particle diameter of 30 nm and an average particle length of 200 nm are connected to form an average of 15 beads. The obtained sol (G) was made into a coating film. [Example 9] In 100 g of the sol (D) obtained in Example 5, 100% by weight of a cationic polymer with a molecular weight of about 4 0 0 0 chlorinated diallyl was added at room temperature under stirring. 7 g of dimethyl ammonium polymer polymer aqueous solution. Ultrasonic disperser is used to disperse, and sol (Η) is obtained. The pH was 2.2, and the obtained sol (H) was used as a coating film. [Example 10] The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed the sol (A) 100 g obtained in Example 1 with stirring and added PerO # 3S (basic chlorine) manufactured by Asada Chemical Industry Co., Ltd. at room temperature under stirring. Ammonium solution) 6.1 g. 10 g of a cation exchange resin (Amberlite, IR-12 0B) which has been formed into a H + type in advance is added, and after sufficiently stirring, the cation exchange resin is filtered. The pH was 3.0 and the sunda potential was 36 mV. The obtained sol (I) was formed into a coating film. [Example Π] -38- This paper size is applicable to Chinese National Standard (CNS) A4 specification (210X 297mm) 20030122 A7 ______B7_ V. Description of the invention (35) Please read the 5 notes before filling in this page. In 200 g of the sol (A) obtained in Example 1, 10 g of commercially available colloidal silica (Sontex N manufactured by Nissan Chemical Co., Ltd.) was mixed to obtain a sol (J). When the obtained sol (]) was made into a coating film, it was dried at room temperature for about 10 minutes to obtain a film having a film thickness of 1 8.0 ± 1.5 // m and pencil strength [Example 1 2] at Glycol was added to the sol (A) obtained in Example 1 so as to contain 10% of the solvent in the sol (A) to obtain a sol (K). The viscosity of this solution was 4 50 cP. When this sol (K) was made into a coating film, it was dried at room temperature for about 1 to 20 minutes to obtain a film having a film thickness of 20.0 ± 0.5 // m and pencil strength HB. [Example 1 3] 2 g of a 10% by weight aqueous solution of Na 2 S 0 3 was added to 200 g of the sol (A) (viscosity 3 50 cP) obtained in Example 1 and stirred for about 10 minutes to obtain a sol. (L). The viscosity of the obtained sol (L) was 1 OcP. When this sol (L) was made into a coating film, it was dried at room temperature for about 10 minutes to obtain a film with a film thickness of 17.0 ± 1.5 // m and pencil strength HB. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs [Example 14] In the reaction solution obtained in Example 1, 'NaOH solution was added to NaOH / Si〇2 in a weight ratio of 0.045, Cool to ° C and use AHP-1010 as an ultrafiltration membrane. When performing Prulonic extraction, a sol (M) with a concentration of 2% by weight at the concentration of silicon dioxide can be obtained. -39- This paper The scale is applicable to the Chinese National Standard (CNS) A4 specification (210 × 297 mm) 200301222 A7 B7 V. Description of the invention (36) It was found that there were thousands of blockages. The average particle diameter of the sample in this sol (M) measured by a dynamic light scattering method was 200 nm, and the converted specific surface area was 1 3.6 m2 / g. It dried the sol at 105 to obtain a porous substance. The average pore diameter of this sample was 1 and the pore volume was 1.10 ml / g of cement dispersant. The difference between the nitrogen-adsorbed specific surface area obtained by the BET method was 5 3 5 m2 / g and the converted specific surface area was 5 2 1.4 m2 / g. When the primary particles of this sample are observed by an electron microscope, they are rod-shaped particles having an average particle diameter of 30 nm, an average particle length of 200 nm, and an average aspect ratio of 6.7. When the obtained sol (M) was made into a coating film, it was dried at room temperature for about 40 minutes to obtain a film having a film thickness of 18.0 ± 2.0 // m and a pencil hardness ΗB. [Example 1 5] Except that PAN membrane KCP-1 010 (manufactured by Asahi Chemical Co., Ltd.) was used in place of AHP-1010, filtration was performed in the same manner as in Example I4, and the same as sol (A) was obtained. At this time, the blocking caused by the surfactant was almost absent, and it was quickly filtered. When washing the membrane after use, the amount of water permeated after washing can be restored to almost the same level as before. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs [Example 16] In the reaction solution obtained in Example 1, 3_ (2-aminoethyl) aminopropyltrimethoxysilane I7 was added while stirring. .4g. The pH of the mixture was 8.5. When the mixture was stirred at 25 ° C for 1 hour, the reaction proceeded to a pH of 8.0, and an aggregate was formed. After filtering the agglutinate, add the weight of the agglutinate] 0 times the amount -40- This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) 20 J30122i A7 B7 V. Water for invention description (37), Be scattered. After filtering the agglutinate, 26.5 g of hydrochloric acid was added. Dispersion using an ultrasonic disperser yielded approximately the same sol (D) as prepared in Example 5. Please read the notes on the back of the page first and then fill in this page. [Example 17] The cation exchange resin (35,000 g (Prulonic P123 concentration 0.2 8%) obtained in the ultrafiltration step in Example 14) was added (

Amberlite IR-120B) and anion exchange resin (Amberlite IR-410) were stirred and filtered. The filtrate was heated to 60 ° C, and was concentrated using κ C P -1 0 1 0 to obtain 1.2 wt% P r u 1 n i c P 1 2 3 aqueous solution of 8 0 0 g. At this time, the concentration of Pr u 1 ο n i c P 1 2 3 in the filtrate was 〇 · 〇 丨%. The time spent in ultrafiltration was 100 minutes. The amount of water permeation after washing with K C P -1 0 1 〇 used at this time can be restored to a level almost unchanged from that before use. When 800 g of an aqueous solution of 2 g of Prulonic P123 was dissolved in this concentrated solution and the same operation as in Example 1 was performed, the sol (A) prepared in Example 1 was approximately the same. 0 [Example 1 8] Ministry of Economic Affairs wisdom Printed by the Consumer Affairs Cooperative of the Property Bureau except for using cellulose membrane C03 OF (manufactured by Nadia) instead of KCP-1010 in the concentration step of Example 16. When Prulonic was concentrated in the same way, the time taken for extraction For about 70 minutes. In addition, the amount of water permeated after rinsing was restored to a level almost unchanged from that before use. [Example 1 9] -41-This paper size applies the Chinese National Standard (CMS) A4 specification (210X 297mm) 20030122. A7 B7 V. Description of the invention (38) Please read the I item on the back and fill in this page to decompress When 100 g of the sol (D) obtained in Example 5 was distilled, 50 g of a sol (N) of a transparent porous material having an SiO 2 concentration of 14% by weight was obtained. The viscosity of this sol is 3 OOcP. When this sol (N) is made into a coating film ', it is dried at room temperature for about 40 minutes, and a film with a film thickness of 30.0 soil 1.5 / m and a pencil hardness F can be obtained. [Example 20] 864 g of cation exchange resin (Amberlite, 1R-120B) which had been previously placed in H + type was dispersed in 864 g of water, and water glass No. 3 diluted with 576 g of water (Si0 = 29% by weight, Na20 = 9.5 wt%) 28 8g and a solution of sodium aluminate (A12 0 3 = 5 4.9 wt%) 0.2 2 8 g. After sufficiently stirring this, the cation exchange resin was filtered off to obtain 1 72 8 g of an active silica aqueous solution. The Si02 concentration of this active silica solution was 5.0% by weight, and the Si / Al element ratio was 450. 104 g of Prulonic P123 manufactured by Asahi Denka Co., Ltd. was dissolved in 229 6 g of water and stirred in warm water at 35 ° C. At the same time, 160 g of the above-mentioned active silica aqueous solution was added at a constant addition rate within 10 minutes. . The pH of this mixture is 3.5. At this time, the weight ratio of water / P123 was 38.5, and the weight ratio of P 1 2 3 / S i 〇 2 printed by the consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs was 1.3. After stirring the mixture at 35 ° C for 15 minutes, it was left to stand at 95 ° C for 24 hours. Using an ultrafiltration device to remove P123 from this solution, a sol (0) of a porous substance having a concentration of SiO 2 of about 7.3% by weight was obtained. The average particle diameter of the sample in this sol (0) measured by a dynamic light scattering method was 195 nm 'and the specific surface area was 14 m2 / g. This sol was dried at 105t to obtain a porous substance. -42- This paper size applies to China National Standard (CNS) A4 (210X 297 mm) 200301222 A7 ____B7 V. Description of Invention (39) (Please read the notes on the back before filling this page) The average of this sample The pore diameter was 10 nm and the pore volume was 1.06 ml / g. The nitrogen adsorption specific surface area measured by the BET method was 590 m2 / g, and the difference from the converted specific surface area was 576 m2 / g. When the primary particles of this sample were observed with an electron microscope, the rod-shaped particles had an average particle diameter of 35 nm, an average particle length of 190 nm, and an average aspect ratio of 5.4. The obtained sol (0) was used as a coating film. [Example 21] Except that the reaction solution of Example 14 was kept at 25 ° C, the extraction was performed in the same manner as in Example 14. The concentration of P1 23 in the filtrate was 0.1%. [Example 22] Except using ALP-1053 (manufactured by Asahi Kasei Co., Ltd.) instead of AHP-1010 of Example 14, prulonic extraction was performed in the same manner. Compared with ΑΡΡ-1 Ο 1 0, although the stream beam is reduced, the extraction system is possible. [Example 23] Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, except that ultrafiltration was performed without adding N a 〇 Η and maintained at p Η 4.0, and P ru 1 ο was performed in the same manner as in Example 14. Extraction of nic. The concentration is reduced to 2% of the Si02 concentration. The flow stream is reduced, but extraction is possible. [Example 24] Except that the concentration of P ru 1 ο nic in Example 17 was kept at the liquid temperature of 25, and it was performed in the same manner as in Example 17, the prulonic solution was concentrated at 8000 g. The paper size is applicable to Chinese national standards. (CNS) A4 specification (210 × 29 * 7 mm) -43- 20030122 A7 B7 filtrate 27000g Pi * ulonic P123 concentration is five. Description of the invention (4) P123 concentration is 0.30% 0.27% 〇 [Example 25] Implementation Example 17, It takes 150 minutes to concentrate Prulonic by using the poly membrane SLP-1 05 3. The water permeability after washing is 90% before use. [Comparative Example 1] A sol (P) having a silicon dioxide concentration of 7.2% by weight was obtained by the same method except that the active silicon dioxide aqueous solution of Example 1 was added for 3 seconds. When the primary particles of this sample are observed by an electron microscope, they are rod-shaped particles having an average particle diameter of 30 nm, an average particle length of 50 nm, and an average aspect ratio of 1.7. The obtained sol (P) was made into a coating film. Please read the notes on the back before filling in this page. Printed on the page by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs -44-This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 Gongchu) 200301222 A7 B7 V. Description of the invention (41) Table 1

Ink absorption water resistance and light resistance Example 1 0X Δ Example 3 〇X 〇 Example 4 〇X 〇 Example 5 〇〇Δ Example 6 〇Δ Δ Example 7 〇〇 △ Example 8 〇〇Δ Implementation Example 9 〇 △ Example 10 〇 △ Example 20 XX △ Comparative Example 1 XXX Table 2

Ordered by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperatives, printed sol viscosity (cP), drying speed (min), film thickness (,), wrong pen hardness Example 1 (A) 360 10 18.0 ± 2_0 ΗΒ Example 11 ⑴ 350 10 18.0 ± 1.5 12 Example 12 (K) 450 120 20.0 ± 0.5 ΗΒ Example 13 (L) 10 10 16.0 ± 1.5 ΗΒ Example 14 (M) 280 40 18.0 ± 2.0 ΗΒ Example 19 (N) 300 40 30.0 + 2.0 F This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) -45- Intellectual Property Bureau of the Ministry of Economic Affairs 200301222 A7 _____ B7 V. Description of the invention (42) Also refer to the specific implementation form. Although this can be explained in detail It is obvious to those skilled in the art that various changes or modifications can be made without departing from the spirit and scope of the invention. The present invention is based on the Japanese patent application (Japanese Patent Application No. 2 00 1-3 9 1 2 1 5) filed on December 25, 2001, and its contents are included for reference. Utilization> The porous material of the present invention has fine pores and is a fine particle. It can be expected to absorb the material internally, protect it with coating, and slowly release it. It is also used in areas that require transparency or smoothness possible. The porous substance of the present invention has a relatively large average diameter, and the particles are microscopically rough, which can easily hold a large amount of material, and the diffusion is faster than when the porous substance of the present invention is produced, a silane coupling agent is required. After treatment, it is made into an acidic state, and cationic substances are added. It is also stable and can produce sols that can withstand long-term storage. The inkjet recording medium of the present invention has the effects of superior ink absorption and transparency. Printed by Consumer News Agency This paper is sized for the Chinese National Standard (CNS) A4 (210X297 mm) -46- (Please read the precautions on the back before filling this page). Installation ·-\ 口%

Claims (1)

20030122 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A8 B8 C8 —_______ D8 ___ #, patent application scope 1 1. A sol containing inorganic porous substances, the average particle diameter of particles measured by dynamic light scattering method An inorganic porous material having an average aspect ratio of 2 to 4 nm or more, a uniform primary diameter mesopores, and substantially no secondary aggregation. 2. The sol according to item 1 of the patent application scope, wherein the mesopores are elongated in the long axis direction. 3. If the sol of the first or second item of the scope of patent application is a sol containing the converted specific surface area SL obtained from the average particle diameter DL of the particle measured by the dynamic light scattering method and the nitrogen adsorption of the particle obtained by the BET method The difference Sb-Sl in the specific surface area SB is 250 m2 / g or more. 4. For the sol according to any one of claims 1 to 3, the average aspect ratio is 5 or more. 5. The sol according to any one of claims 1 to 4, wherein the inorganic porous substance is made by oxidation. 6 · The sol according to claim 5 in which the inorganic porous substance comprises aluminum. 7. The sol according to any one of claims 1 to 6, wherein the average diameter of the mesopores is from 6 n m to 18 n m. 8. The sol according to any one of claims 1 to 7 of the scope of patent application, is a compound containing an organic chain in combination with the inorganic porous substance. 9. The sol as claimed in the scope of patent application No. 8 in which the compound containing the organic chain is a sand garden coupling agent. 10. The sol as claimed in claim 9 wherein the silane coupling agent contains a fourth-order ammonium group and / or an amine group. (Please read the notes on the back before filling in this page)-Binding and binding ¾ This paper size applies to China National Standard (CNS) A4 (2ΐ〇χ297 mm) -47- Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 20030122 A8 B8 C8 _______ D8 6. Scope of patent application 2 11. The sol according to any one of the scope of claims 1 to 10, wherein the inorganic porous substance contains those connected and / or divided into rosary shapes. 1 2. A kind of porous substance, which is obtained by removing the solvent from the sol according to any one of the scope of claims 1 to 丨. 1 3. — A method for producing a sol containing an inorganic porous substance, comprising a metal source and / or a precursor thereof mixed with a metal source and a mold and a solvent to produce a dispersion of the metal oxide / model composite And a method for manufacturing a sol of an inorganic porous substance formed by the step of removing the model from the composite. In the mixing step, a metal source is added to the model solution or a model solution is added to the metal source. Made over 3 minutes. 1 4 · The manufacturing method according to item 13 of the scope of patent application, wherein the adding time is more than 5 minutes. 15. The manufacturing method according to item 13 or 14 of the scope of patent application, wherein the metal source is active silicon dioxide. 16. The manufacturing method according to any one of claims 13 to 15 in the scope of patent application, wherein the model is a nonionic surfactant. 17. The manufacturing method according to item 16 of the scope of patent application, wherein the model is based on the following structural formula (1) RO (C2H4O) a- (C3H6O) b- (C2H4O) CR (1) (However, a and c are each Refers to 10 ~ 110, b means 30 ~ 70, R means ammonia atom or alkyl group with 1 to 12 carbon atoms) non-ionic surfactant, the solvent &amp; scale is applicable to Chinese National Standard (CNS) A4 specification (210 X 297 mm) — ^ ·: ----- (Please read the notes on the back before filling this page) 20030122 B8 C8 D8 5. Scope of patent application 3 The weight ratio of the agent to the weight of the model (solvent / model) is in the range of 10 to 1,000. The metal source and model are mixed with the solvent. 18. The manufacturing method according to any one of claims 13 to 17 in the scope of the patent application, wherein the weight ratio (model / Si02) of the Si i02 converted weight of the model to the active silicon dioxide of the metal source is 0. 〇1 ~ 30 range. 19. The manufacturing method according to any one of claims 13 to 18 of the scope of patent application, further comprising the step of adding an aluminate base. 2 〇. The manufacturing method according to any one of claims 13 to 19 in the scope of patent application, after mixing a metal source made of a metal oxide and / or its precursor with a model and a solvent, adding a base and adjusting Step of pH to 7 ~ 10. 2 1. The manufacturing method according to any one of claims 13 to 20 of the scope of patent application, the removal step is performed by an ultrafiltration method. 22. As for the manufacturing method of the scope of application for patent No. 21, the filtration membrane used in the ultrafiltration is a hydrophilic membrane. 23. If the manufacturing method according to any one of claims 13 to 20 is applied, the removal step is performed by adding a silane coupling agent, and then adjusting the pH to the isoelectric point to attach and gelate. After the removal step, the pH is removed from the isoelectric point and dispersed. 24. The manufacturing method according to any of the items 13 to 23 of the scope of patent application 'is to cool the sol to the temperature of the micro-cell formation temperature of the model in this removal step. The manufacturing method of this item includes a step of concentrating by distillation after the removing step. 26. If the manufacturer of any of the 13th to 25th of the scope of the patent application applies to the paper size of this paper, the Chinese National Standard (CNS) A4 specification (210X29? Mm) is read. Please read the precautions before writing this page. Printed by the Consumer Affairs Cooperative of the Property Bureau-49- 20030122 Α8 Β8 C8 D8 6. Application for Patent Scope 4 Method, which reuses the model removed from the metal oxide / model compound. 27. If the manufacturing method of the scope of application for the patent No. 26 is in the reuse of the model, the valley liquid containing the model removed from the metal oxide / model complex is heated to a temperature above the cell formation temperature, and the ultrafiltration Steps to enrich the model. 28. If the manufacturing method of item 27 in the scope of patent application is applied, a hydrophilic membrane is used for the filtration membrane of the ultrafiltration during the reuse. 29 · — An inkjet recording medium made of a support and at least one ink absorbing layer provided on the support. At least one layer of the ink absorbing layer contains the porosity of item 12 of the scope of patent application. substance. 30. A coating solution for inkjet recording media, which contains a sol according to any one of claims 1 to 11 of the patent application scope. (Please read the precautions on the back before filling out this page). Binding and ordering Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs Employee Cooperatives This paper is printed in accordance with the Chinese National Standard (CNS) Α4 specification (210X297 mm) _ 50-(1) 2. The designated representative of this case is: None (II). The representative symbols of the elements in this case are simply explained: If there is no chemical formula in this case, please reveal the ones that can best show the characteristics of the invention.