TW200929205A - Information recording medium and method for manufacturing information recording medium - Google Patents

Abstract

The invention provides an information recording medium where a print receiving layer has a very high coloring property, exhibits high glossiness and drying property and is hardly scratched, and a handling property of a coating solution of the print receiving layer is good, and it also provides a method for manufacturing the same. An information recording medium 1, comprising a substrate 10 and comprising at least an optical information recording layer 11, an undercoating layer 14 and a print receiving layer 15 on the substrate 10, wherein the undercoating layer 14 contains not more than 2. 6% by mass of a defoaming agent or a leveling agent, and the print receiving layer 15 is a porous layer containing inorganic fine particles having an average secondary particle size of not more than 500nm, as a main component, and polyvinyl alcohol.

Description

[Technical Field] The present invention relates to an information recording medium and the like, and more particularly to an information recording medium having a print receiving layer and the like. [Prior Art] The target is widely accepted by the market as a negative recording medium with optical recording information and readable optical information, including cD (Compact Disk) and © DVD (Digital Versatile Disk). CD and DVD have CD-ROM and DVD-ROM for reading only; single-write CD_R, DVD-R, DVD+R for recording information at one time; and rewritable for overwriting information records , CD-RW, DVD-RW, DVD+RW, DVD-RAM. In addition, recently, Blu-ray Disc (BD) and HD-DVD discs, which are high-capacity recording media, have been put into practical use in order to perform higher-drinking ‘use of short-wavelength blue lasers. These information recording media's use of printing methods such as screen printing to make classification and storage easier, or to enable easy identification of data content, on the label side of the media recording (light irradiation implementation information record) The opposite side of the face) the case where the printed content is marked. However, in the case of the current printing method, it is necessary to produce a printing brush plate in a small amount of production, which leads to an increase in cost. When the printing design is changed, it is necessary to change the brush plate and perform color comparison every time, which also causes workability to deteriorate. Etc. = happen. " The problem has been developed on the label side of the information recording media' 涂97139305 4 200929205 嘴墨印机 or sublimation type thermal transfer printer for printing and printing 可 讯 讯 讯 recording media, And it is commercially available. In addition, in addition to such a coating, the U-* layer of information is used in the printer document, and is disclosed in the patent document 1 m4 printer, which is printed on the information recording medium after being printed on the thief. the way. Qi is very mixed.疋' In this way, the position of the label is recorded. In recent years, it can be directly printed on the information recording medium and the low-priced machine is not ##. Because the information recording media printed by the ink can be made not only for professional use, but also widely used in household use. The print acceptance layer of such an inkjet printable information recording medium, for example, in the special literature 2 Patent read 8 towels, the domain has been disclosed as UV-curable tree sap, or a combination of UV-curable resin and ink swellable resin. Q material 3 towel has been reported to borrow (4) plus pigment particles to improve ink Dry printing print-receiving layer. F. Document 9 towel proposal 'Paper-receiving layer of cationic polymer which is mainly composed of polyether thorn or Juyixian secret, and mixed with cationic polymer as an ink fixing agent s Further Patent Literature 1 to Patent Document 13 + proposes a printing receiving layer containing at least fine particles, polyvinyl alcohol, a butterfly compound, and a prefecture agent, and the fine particles are preferably fumed stone, pseudo-thin water (pseud) 〇 〇 〇 〇 〇 。 。 。 。 。 。 。 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有 具有In addition, it is also possible to use a vermiculite which is synthesized by a wet method (hereinafter referred to as "wet method"), and the inventors of the present invention have a wet-type vermiculite which is pulverized to an average secondary particle scale of 500 nm or less. And polyvinyl alcohol as a main body of printing: a layer of information recording media report (refer to Patent Document 15). ❹

Patent Document 1: Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. 2004-234764. Patent Document 3: Japanese Patent Laid-Open No. 2004-030716. Patent Document 4: Japanese Patent Laid-Open No. 2 〇4_〇3〇769号 Patent Document 5: Japanese Patent Laid-Open Publication No. Hei. No. 4-5 〇 〇 〇 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 日本 日本 日本 日本 日本 日本 日本 日本 日本 日本 日本 专利 专利 专利 专利 专利 专利Japanese Laid-Open Patent Publication No. Hei 08-279179, Japanese Patent Laid-Open Publication No. Hei No. Hei. No. Hei. No. 9-24538 No. Patent Publication No. 9 Patent Literature No. Patent Document No. Patent Document No. Patent Document No. Patent Document No. Patent Document No. Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. 2005-276299. The problem of the problem to be solved by the patent document 2 to the patent document 8 is the main use of the oil, and the problem of the problem to be solved by the patent document 2 to the patent document 8 is disclosed in the patent document No. 2007-076007. The swelling of the ink-swellable resin absorbs the swollen form of the ink. In the case of such a swollen form, there is a case where the ink drying property is insufficient in comparison with the ink-jet recording material in which the ink is absorbed by the capillary form of the fine voids in recent years. Therefore, after printing, the image or the finger is tarnished when the print portion is touched with the finger, and © when stored in the box together with the index, there is a problem that it is attached to the index and cannot be used. In addition, the professional copying system has a number of consecutive prints of tens to hundreds of pieces. In this case, there is a problem that the media is stacked on the tray after printing. There is a problem such as blocking. Next, as exemplified in Patent Document 3, when the pigment particles are used in an increased manner, there is a problem that the adhesion to the substrate is deteriorated, the color developability, and the gloss are lowered. In addition, these ultraviolet curable resins are problematic in terms of skin irritancy, odor, and the like. Further, as reported in Patent Document 9, when a hydrophilic resin is used as a main component, there is no problem in safety and workability, but since it is in a swollen form, drying property is insufficient. On the other hand, 'the patent document 1〇~patent document 13 and the patent document π report' also use a technique of using a gas phase method for synthesizing vermiculite (hereinafter referred to as "gas phase method vermiculite") when using a gas phase method. When vermiculite, pseudo-boehmite and alumina were used, there was no problem in safety and workability, and color development, gloss and dryness were also improved by 97139305 7 200929205. However, since the gas phase method has the three-dimensional network structure of the secondary particles, the long-term stability is low, and when the length is _ (four), the degree of the riding liquid is increased, so that the operation is significantly deteriorated. , 匕外' When using the Μ Μ 绍 石 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、

When the meter prints the label side, or when it is actually driven, it also refers to the problem of scratching caused by 曱. 4 susceptible to & master or ❹ , , , , , , , , , , , , , , , , ❹ 即便 即便 即便 即便 即便 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 The situation. Therefore, & paper printing table, therefore, is expected to have the use of all the label printer; Dafei: physical injury is injured, the coating liquid at the time of manufacture is good in operation: the second object of the present invention is to provide a female The material has a high color development and high dryness, is not easily scratched, and is printed with an information recording medium which is excellent in handleability of the coating liquid and a method for producing the same. (Means for Solving the Problem) According to the present invention, the following (1) to (12). 〇), an information recording medium having: a substrate, and an optical information recording layer and a primer on the substrate a layer and a printing receiving layer, wherein the undercoat layer contains an antifoaming agent or a leveling agent of 26% by mass or less; and the printed interface layer contains an inorganic fine particle having an average secondary particle of 500 nm or less and a polyvinyl alcohol of 97139305 8 200929205 A porous layer as a main component. The information recording medium described in the sub-section, wherein the inorganic fine particles are pulverized to a wet method having an average secondary particle diameter of 5 GGnm or less, and a gas phase having an average primary particle diameter of 1 〇 nm to 2 〇 nm. The mass media ratio of (A/B)=(70/30)~(30/70) is contained. (3) The information recording medium as described in (1) or (2), wherein the upper brushing layer contains water-soluble Sexual genus.

(4) A method of producing a message recording body according to any one of the items (1) to (3), wherein the printing receiving layer is formed on the undercoat layer by a spin coating method. (5) The method of manufacturing the information recording medium according to the item (4), wherein the printing receiving layer is at an outer peripheral portion of the dragon recording medium, and an exhaust wind speed from the center of the asset recording medium toward an outer circumferential direction is Μ or more In the environment, it is formed by the above-described spin coating method.

(6) A type of information recording medium comprising: a substrate; an optical information recording formed on the substrate directly or via another layer; and a side opposite to a laser beam incident on the substrate, directly or via another layer a primer layer and a print receiving layer, wherein the undercoat layer contains a defoaming uniform coating agent in a range of from 2% by mass to 26% by mass; and the printing receiving layer contains an average secondary particle diameter of 20 nm. Inorganic fine particles of ~5 〇〇 nm and a porous layer containing polyvinyl alcohol as a main component. (7) A method of manufacturing an information recording medium, comprising: a substrate having 97139305 9 200929205; and forming at least an optical information recording layer and a print receiving layer on the substrate, wherein the printing receiving layer contains an average secondary particle diameter of 500 nm A method for producing an information recording medium comprising a porous layer of a polyvinyl alcohol; wherein the printing receiving layer is at an outer peripheral portion of the information recording medium at an exhausting velocity from a center of the information recording medium toward an outer circumferential direction It is formed by spin coating in an environment of 4 m/s or more. (8) The information recording medium according to any one of (1) to (3) wherein the protective layer is formed between the optical information recording layer and the undercoat layer. (9) The information recording medium according to any one of (1) to (3) wherein: the undercoat layer has a multilayer structure; and a defoaming agent or a leveling agent abutting on a side of the printing receiving layer The content is 2.6 mass% or less. (1) The information recording medium according to any one of (1) to (3) wherein the undercoat layer has a single layer structure. (11) The information recording medium according to any one of (1) to (3), wherein the primer layer is composed of an acrylate-based monomer and an acrylic antifoaming agent or a uniform coating layer. The ultraviolet curable resin is contained in an amount of 2.6% by mass or less. Here, the term "ultraviolet-curing resin" means that the ultraviolet-curable ink (ultraviolet curable composition) is cured by ultraviolet irradiation. (12) A method of manufacturing an information recording medium, comprising: a step of preparing a substrate; and a step of forming an optical recording layer directly or via another layer on one main surface of the substrate; a step of forming an undercoat layer containing an antifoaming agent or a leveling agent of 2.6 mass% or less 97139305 10 200929205 on the opposite side of the optical information recording layer or the optical information recording layer; the smear coating method is The step of containing inorganic fine particles in an average of two recording diameters of 5 GGnm. The invention relates to a printing receiving layer composed of a porous layer of the main component (invention effect). According to the present invention, it is provided with a very high color developability, dryness and dryness, and the second wire is easily scratched, and the printing is accepted. The layer coating liquid has good operability information and has been recorded. [Embodiment] The following describes the embodiments of the present invention in accordance with the drawings. The present invention is not limited to the following embodiments, and various changes can be made without departing from the scope of the invention. The drawings used are only for the purpose of illustrating the embodiments, and do not refer to actual size. (Information recording medium: implementation form _ _ I彳-Γ is an information recording medium suitable for the present embodiment - an example is not illustrated. The information recording medium I shown in Fig. 1 belongs to a substrate surface incident type, and is composed of the substrate 10 and The layers of the stacked layers are sequentially formed on the main surface of the substrate 1 to form the layers of the stacked layers: the optical information recording layer 11 for recording data; the incidents from the substrate 10 side are immersed, ▲ ^ The incident laser light L· the light reflecting layer 12 to be reflected; the protective layer U of the light reflecting layer 12 and the optical information recording layer U; the adhesion between the layer 15 and the brush layer 15 and the lifting pattern The undercoat layer 14 for coloring and gloss; and the outermost printed receiving layer 15. 97139305 11 200929205 As shown in Fig. 1, the information recording medium is generally referred to as a "substrate surface incident type" structure, and is recorded and The laser beam L' irradiated to the optical information recording layer u during reproduction is incident from the substrate 10 on the substrate 1 side of the printing receiving layer 15 in the opposite direction. Further, the printing receiving layer 15 is provided with an ink jet recording head. The inkjet printer records text or images. The anti-foaming agent or the leveling agent contained in the undercoat layer 14 is 2.6 mass% or less, and the printing-receiving layer 15 is composed of inorganic fine particles having an average secondary particle diameter of 〇500 nm or less and polyvinyl alcohol. (Comparative recording medium: Embodiment 2) > Fig. 2 is a schematic diagram showing another embodiment of the information recording medium. The same structure as that of the information recording medium I shown in Fig. 1 The same component symbols are used, and the description is omitted. The information recording medium π shown in FIG. 2 belongs to a film surface incident type, has a substrate 10, and a light reflecting layer 12, an optical information recording layer 11, and a protective layer laminated on the substrate 10. 13. In addition, the substrate 10 has an undercoat layer 14 for improving adhesion to the printing receiving layer 15 and for improving image coloring and gloss on the substrate 10 on the opposite side of the layers, and a structure in which the outermost printing receiving layer 15 is laminated. The laser light irradiated to the optical recording layer 11 during recording and reproduction [from the side opposite to the protective layer 13 on the opposite side of the printing receiving layer 15 is Figure The substrate surface shown by 丨 is the same as the case where the plastic information recording medium I is incident. Here, although the defoaming agent or the leveling agent contained in the undercoat layer 14 is described in detail later, the material is 97. 00. The layer 15 is composed of a tangential average secondary particle size layer. 'Sub- and porous material as a main component (printing-receiving layer 15) Hereinafter, the printing-receptive layer 15 will be described. The average secondary particle size is 5.- 〇 structure fresh particles and polyvinyl alcohol as main components, and a porous layer structure is formed. The combination of the printing receiving layer 15 having such a structure and a predetermined undercoat layer 14 described later' The printing receiving layer a having high adhesion to the undercoat layer 14 and having few surface defects can be realized while maintaining high gloss and dry impurities. The printing acceptance of the porous layer 1 >1 refers to the printing receiving layer 15 in which the layer 3 has "", the fine particles of the machine as a main component, and the ink is mainly absorbed by the pores formed by the coated towel. In addition, the term "main component" means a ratio of the ratio of the total solid content of the component constituting the printing receiving layer 15 to a solid content of 5 〇 or more by mass%, preferably containing 60 parts by mass of the solid portion (4) of the solid portion by mass. . The printing receiving layer 15 contains inorganic fine particles as a main component, and examples thereof include known synthetic fine particles such as amorphous synthetic stone, alumina, oxidized cuilu hydrate, calcium carbonate, magnesium carbonate, and titanium dioxide. . From the viewpoint of ink absorbability and productivity, it is preferably amorphous synthetic vermiculite, aluminum oxide (alumina), or alumina hydrate. In particular, from the viewpoint that the surface strength of the coating film is high and the coating liquid is easy to maintain long-term stability, it is more preferable to use an amorphous synthetic stone. The amorphous synthetic stone stone can be roughly classified into a wet method according to a manufacturing method, a stone, a gas phase method, and the like, and among them, a wet method stone and a gas phase method stone are preferable. In the present embodiment, in particular, in order to simultaneously satisfy the long-term stability of the cloth (four), the color development property when printing is performed by a label printer having a low color developability, and the like, in particular, it is pulverized to an average of two times. The wet-form method W(A) having a particle diameter of (10) or less and the gas-phase method of the average-sub-granule 彳f 1Q to 2Gnm are preferably contained in a mass ratio of (A/BM70/30) to (30/70). . • The wet method vermiculite can be further classified into the precipitation method according to the manufacturing method, 矽 vermiculite, gel method vermiculite, and sol-form vermiculite. The precipitation method vermiculite is prepared by reacting sodium citrate with sulfuric acid under alkaline conditions. The vermiculite particles grown by the particles are agglomerated and precipitated, and then finished by filtration, washing, drying, pulverization, classification, and the like. The precipitation method has been commercially available, for example, as T0S0H SIUCA Co., Ltd. (product name: NIPSIL), and Desan Co., Ltd. (product name: 0KUSIL). The gel method is prepared by reacting sodium sulphate with sulfuric acid under acidic conditions. Since the fine particles are dissolved in the ripening and are combined with other primary particles to be precipitated again, the clear primary particles disappear and form harder aggregated particles having an internal void structure. For example, TOSOH SILICA Co., Ltd. (product name: NIPGEL) and GRACE JAPAN Co., Ltd. (product name: SYLOID, SYLOJET) are commercially available. The sol-formed vermiculite, also known as colloidal vermiculite, is obtained by metathesis of an acid such as sodium citrate or a smectite sol obtained by passing an ion exchange resin layer of 97139305 14 200929205, and is obtained by heating and aging. Co., Ltd. (product name: Sn〇wtex) and other products are on sale. In the present embodiment, the wet method vermiculite is pulverized to an average secondary particle diameter of 500 nm or less and then used. The wet primary stone preferably has an average primary particle diameter of 5 or less, particularly preferably 3 nm to 4 Gnm, and preferably 5 to im 50/zm in the average agglomerated grain. The wet-type vermiculite having such an average primary particle diameter is preferably used in the presence of a cationic compound to be finely pulverized to an average secondary particle diameter of 5 〇〇 (10) or less (preferably about 20 nm to 200 nm). When the average secondary particle diameter is too large, the color developability and glossiness are lowered. • In addition, the so-called "average primary particle size" refers to the observation of the microparticles of the wet method stone by an electron microscope, which is equal to the projected area of any 100 primary particles present in the obtained image. The round record is regarded as the particle size, and the average particle diameter is determined. Further, the "average secondary particle diameter" means that the printed receiving layer of the obtained recording material is observed by an electron microscope, and as in the case of the average primary particle, 'anything existing in the obtained image is obtained. The average particle size of 100 agglomerated particles. The wet-type vermiculite obtained by the general method has a mean agglomerated particle diameter of 1 or more, and is used after being finely pulverized. The pulverization method is preferably a wet dispersion method in which a vermiculite dispersed in an aqueous medium is subjected to mechanical pulverization. At this time, it is preferable to use a sedimentation method ♦ stone having an oil absorption amount of 21 〇 ml/i 〇〇 g or less and an average condensed amount of 97139305 15 200929205. By using such a shoal method, the initial viscosity of the dispersion can be suppressed, the dispersion can be increased at a high concentration, and the pulverization and dispersion efficiency can be improved, and the ruthenium can be pulverized into smaller particles. In addition, the productivity of the recording paper can be improved by using a high concentration dispersion. The oil absorption amount was measured in accordance with the description of JIS K-5101. In the present embodiment, 4 towels are obtained, and a wet method having an average secondary particle diameter of 5 QQ nm or less is obtained.

The specific method of stone 'firstly, it is preferable to prepare a pre-separation of the mixed particles of the stone and the cationic compound. The pre-dispersion liquid is at least one of a dispersing device such as a shovel-type disperser, a snail-leaf type disperser, or a rotor/stator type (rQtQr/sta such as e) disperser, and a rare earth particle_ionic compound Mix and disperse. If necessary, you can also add a moderate amount of low boiling point solvent. ♦ The solid concentration of the stone pre-dispersion is not particularly limited, and is preferably 15 solid parts of the mass of the solid part, especially the solid content of the solid portion of the solid portion of the solid portion of the stone. If the concentration of _ is too high, there is a tendency that it cannot be dispersed. Further, by giving a stronger mechanical means, a wet method stone dispersion having an average diameter of 500 nm or less can be obtained. The mechanical means can be: using the human 1 method, it is possible to use a grinding machine such as a ball mill, a bead mill, a grinder, etc. - (1)) a high-healing homogenizer, an ultra-high (four) mass machine, and the like. Sound wave disperser and film rotary type disperser. The above wet (tetra) stone-dispersed __-substrate is preferably a sub-polymer. The cationic polymer may, for example, be polyethylenimine, poly 97139305 200929205 dipropyl propylamine, polyallylamine or alkylamine polymer. In particular, for example, the Japanese Patent Laid-Open Publication No. 59-Q2_, the Japanese Patent Publication No. _59-A No. 76, the Japanese Patent Publication No. 033177, and the Japanese Patent Laid-Open No. Hei. Japanese Unexamined Patent Publication No. Sho. No. Sho. No. 4, No. 4,999, No. 4, No. 6G-G, No. 2, No. 62, No. 62, No. In the case of the Japanese Patent Publication No. 63-115780, the Japanese Patent Publication No. Hei. No. 63- No. 71, and the Japanese Patent Application Publication No. Hei. No. Hei. A polymer of a primary amino group to a tertiary amino group or a quaternary ammonium salt group is preferred. -a In particular, in the present embodiment, from the viewpoint of long-term stability of the coating liquid, the 11⁄4 ion compound is most preferably used. A propylamine derivative. From the aspects of dispersibility, dispersion viscosity and long-term stability, the molecular weight of the cationic polymers is preferably about 2,000 to 100,000, especially about 2 〇〇〇 to 3 ❹. Preferably, the cationic polymer is preferably added in an amount of up to 10% by weight relative to the vermiculite. In the present embodiment, the gas phase method vermiculite is also referred to as "dry method stone" in the case of wet method vermiculite, which is generally a flame hydrolysis method (f 1 ame hydro 1 ys is method). Specifically, a method in which four gasified hydrazine is burned together with hydrogen and oxygen is generally known. Alternatively, instead of tetrachloride, a sulphur-based triclosan may be used instead. , the three gas stone shochu and other stone shochu. In addition, 'the sulphur-based triclosan or the sulphate and other calcinations, can also be used alone or mixed with 97139305 17 200929205 antimony tetrachloride. It is used in any state. The gas phase method has been commercially available from AER0SIL Co., Ltd. (product name: AE Hall (5), Deshan Co., Ltd. (product name · QS type). The average primary particle diameter of the fumed vermiculite is usually preferably about 10 nm to 20 nm. If the average primary particle diameter is within this range, the long-term stability of the solution is good, and high color developability can be obtained. It is preferable to use an average primary particle diameter of l〇nm~15nm, depending on The ratio of the surface area measured by the BET method is preferably 150 m 2 /g or more. The term "BET method" as used herein refers to a method for measuring the surface area of a powder according to a vapor phase adsorption method, which is obtained from an adsorption isotherm. The method of measuring the total surface area (i.e., specific surface area) of the lg sample. Usually, most of the adsorbed gas is nitrogen, and the most commonly used method is to measure the amount of adsorption from the pressure or volume change of the adsorbed gas. The most famous ones are Brunauer and Emmett'Teller, which are commonly known as "BET type" and are widely used in surface area. The surface area can be obtained by taking the amount of adsorption according to the BET formula and multiplying the area occupied by one adsorbed molecule on the surface. In the present embodiment, the vapor phase-formed vermiculite system may be preferably dispersed to have an average secondary particle diameter of 500 nm or less, preferably 10 nm to 300 nm, particularly preferably 20 nm to 200 nm. Further, it is preferred to use a gas phase method in which dispersion is carried out in the presence of a cationic compound. The dispersing method is preferably to pre-mix the gas phase method with the dispersing medium by using ordinary propeller scramble, turbine type scramble, homogenous scramble type stirring, etc., followed by using a ball mill, a bead mill, and a grinder. Grinding medium dispersing machine; high pressure 97139305 18 200929205 Homogenizer, ultra-high pressure homogenizing decompression machine; ultrasonic disperser, film rotary disperser, etc., dispersion. The gas phase method is suitable for the ❹-ionic compound, and the same can be used as the cationic compound used in the dispersion of the wet method. Further, similarly, from the viewpoint of long-term safety of the coating liquid, the cationic polymer is preferably a decadiene-derivative. From the viewpoints of dispersibility, dispersion ❹ 黏 viscosity and long-term stability, the molecular weight of the cationic polymers is preferably 2, _~ just, just left and right, especially 2, about the age of the sacrificial surface. The amount of the substance added is preferably in the range of % to 1% by mass of the solid portion. In the form, the printing receiving layer 15 contains polyethylene having an essential component. The use of polyethylene _' improves the transparency of the printing receiving layer 15, and is low and good. Further, 'because polyethylene glycol has a low swelling property at room temperature and is in contact with inorganic fine particles, and the higher the bonding strength between η and η, the ink absorbability is good/good with the substrate 10 is obtained. Follow-up. Polyvinyl alcohol is not particularly limited, and most or cationically modified polyethylene is used for disasters, and diacetylated polyvinyl alcohol. . Here, it is also possible to use the partially saponified polyethylene printing receiving layer 15 in terms of the maximum amount of hiding (four) ink-recording parts, especially the C5 solid mass%, solid-shaped so-called "yangshuo work-related damage" The %~3 〇 形 形 。 改 改 改 改 97 97 97 97 97 97 97 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 ~Secondary amine group, or quaternary group of polyvinyl alcohol. The degree of saponification of the vinyl alcohol is preferably 80% or more, and the average degree of polymerization of the poly(polyethylene glycol) is preferably 500 to 5,000. In particular, the average degree of polymerization is preferably from 3,000 to 4, from the viewpoints of coatability, ink absorbability, and the like of the printing receiving layer 15. In the present embodiment, 'the print-receiving layer 15 may contain a hard coat agent together with polyvinyl alcohol. Hard _ especially has deleted compounds. Such a boron compound is which acid, salt breaking, rotten sand, and the like. The rotten compound may be used alone or in combination of two or more. Among these, the salt is called salt, partial salt, diborate, tetrazoate, and pentarate. In the present embodiment, it is preferable that the printing receiving layer 15 contains a cationic fixing agent for improving color developability and water resistance. As the cationic fixing agent, various cationic polymers and various polyvalent metals exemplified as the cationic chemical compound used for the dispersion in the wet method. Among these, it is preferable to use a water-soluble polyvalent metal represented by a 7]c soluble is compound, a water-soluble wrong compound or the like. These compounds may be in the form of an inorganic salt or a single salt or a double salt of an organic acid, a metal complex or the like. In the fourth embodiment, the (ii) water-hybrid complex may, for example, be a chlorinated product or a hydrate thereof, a sulfuric acid IS or a hydrate thereof, an ammonium-based inorganic salt, or an inorganic aluminum-containing cation such as an anthracene polyfluorene oxide compound. polymer. The water-soluble reduced form +, preferably cyclized 4 is oxidized to 97139305 20 200929205 because it can be stably added to the coating liquid forming the printing receiving layer 15. The main component of the argon-containing polyarsenic oxide compound is a water-soluble polyaluminum hydroxide which is alkaline and stably contains a high molecular weight polynuclear condensed ion, as shown in the following (Formula 1), (Formula 2), and (Formula 3). [Al2(0H)nCl6-„]B (Formula 1) [Al(0H)3]nAlCl3 (Formula 2) Aln(0H)mCl(3n-m) (0 <m< 3n) (Formula 3) ❹ The multinuclear condensed ion system is [A16(0H)15]3+, [Al8(〇H)2〇]4+, [Α113(0Η)34]5+, [Aln(OH)6〇]3+ and the like. - Such basic polyaluminum hydroxide compounds are commercially available, such as: Domus Chemical Co., Ltd. (water treatment agent: polyaluminized aluminum PAC), Asada Chemical Co., Ltd. (Polydomin Paho), Rikengreen Limited (product name:

Purachem WT) et al., and other manufacturers are commercially available for the same purpose, and can easily obtain various grades of products. In the present embodiment, these commercially available products can be used as they are. The water-soluble zirconium compound used in the present embodiment may, for example, be acetic acid hammer, cerium nitrate, basic zirconium carbonate, zirconium hydroxide, barium carbonate/ammonium, zirconium carbonate/potassium, barium sulfate, zirconium fluoride or zirconium chloride. , zirconium chloride octahydrate, zirconium oxide, zirconium oxyhydroxide, and the like. Among these, an acetic acid (zirconia-based) compound is preferably added, and it can be stably added to the coating liquid towel forming the printing-receiving layer 15, and excellent bleed resistance can be obtained. 97139305 21 200929205 Dilute Element Chemical Industry Co., Ltd. These water-soluble oxime compounds have been commercially available, for example, from First Co., Ltd. (product name: ZirC〇sol ZA_2〇, ZA_3〇, etc.), Japan Light Metal Co., Ltd., and the like. The total amount of the water-soluble (tetra) compound and the water-soluble hammer compound in the printing receiving layer 15 is preferably 1 g (four) parts by mass or less, particularly preferably 0.5% by mass to 8 parts by mass. The print receiving layer 15 of the present embodiment preferably contains a polymer latex having a polymer having an average particle diameter of 100 nm or less and a glass transition temperature of less than a shoe, and an alkanediol having a carbon number of 3 to 5 carbon atoms. At least more than one selected. By including at least one selected from the polymer latex and the chain diol, the printing receiving layer 15 can maintain the color developability, gloss, and dryness of the print-receiving layer 15 and suppress the attack. The dry shrinkage of layer 15 and the shrinkage of the coating due to temperature/humidity variations. Further, the coating liquid of the printing receiving layer 15 has high long-term stability and good handleability. In the present embodiment, the polymer latex is a latex which is polymerized by an emulsion polymerization method, and, for example, a styrene-butadiene copolymer emulsion; a polyacrylate latex, a polymethacrylate latex, and an acetic acid are preferably used. Vinyl ester latex, ethylene vinyl acetate latex, and the like. The average particle size of the polymer latex is preferably below 100 nm. Further, the glass transition temperature Tg of the polymer contained in the polymer latex is preferably 4 or less. If the average particle diameter of the polymer latex is too large, the transparency of the printing receiving layer 15 may be lowered, the color developability may be deteriorated, or the gloss may be lowered. If the glass transition temperature of the polymer contained in the polymer latex is too high, the plasticizing effect obtained by adding the polymer latex to the printing receiving layer 15 is lowered, and the drying shrinkage of the printing receiving layer 15 is not easily suppressed. Or, in the case of a change in the shrinkage of the coating due to a change in temperature and humidity, it is difficult to obtain a long-term stability improvement effect of the coating liquid. The amount of the polymer latex used is preferably 5 parts by mass to 3 parts by mass of the inorganic particle granules contained in the printing receiving layer 15 , and particularly preferably 5 parts by mass of the solid portion V20. . When the amount of the polymer latex used is too small, there is a tendency that the effect of suppressing the change in shrinkage of the coating layer is not obtained. On the other hand, when the amount of the polymer latex used is too large, there is a tendency for the ink absorbability to decrease. 0 The number of the chain-burning diol having 3 to 5 carbon atoms is propylene glycol, butylene glycol, and decanediol. Such isomers; branched butanediols such as 3-methylbutanediol and the like. Among these, propylene glycol having a carbon number of 3 to a carbon number of 4 and butyl glycol are preferred, and propylene glycol is preferred. The propylene glycol is, for example, propylene glycol 〇 2 - propylene glycol) or the propylene glycol diol α, 3- propylene glycol, and particularly preferably propylene glycol. The printing receiving layer 15: the carbon number of the carbon number of 5, the amount of the chain condensing diol, relative to the inorganic fine particles, preferably 0.1% of the solid part of the solid part%, especially the solid part%% to 20 solid The mass% is preferred. The film thickness of the printing receiving layer 15 of the present embodiment is preferably not less than the square m, and particularly preferably 15 or more. And the most ambiguous below 2 〇〇 heart, especially the chest ^ 97139305 23 200929205 The following is better, more preferably 50 to m or less. If the printing accepts a wide thickness of 15 and the thickness is too thin, there is a tendency that the ink absorption of the ink is insufficient and the color developability is lowered. On the other hand, if the film thickness of the printing receiving layer 15 is too thick, the manufacturing cost tends to increase. • This solid-state towel 'private' I, II can also be placed on the print-receiving layer 15 to further step-by-step the protective layer. By the setting of the protective layer, the surface strength can be further improved, and the preservation of the image can be improved. The protective layer must have the property of accepting the ink or allowing the ink to penetrate. The layer thickness of the protective layer is preferably O.OUm~1000, which is preferably 〇1_~1〇〇_. ‘,、'. In the present embodiment, the method of applying the print receiving layer 15 is not particularly limited. A known coating method can be used. The coating method is preferably, for example, a slide method, a curtain coating method, an extrusion method, an air knife method, a roll coating method, a column coating method, a screen printing method, a spray coating, a spin coating method, or a dip coating method. Among them, it is preferable to form the print receiving layer 15 by spin coating. When the printing receiving layer 15 is formed by spin coating, the coating (iv) viscosity is preferably 200 mPa·s or more and 12 μmPa·s or less. Further, the number of rotations when spin-drying is preferably 50 rpm or more and 2 rpm or less. If the printing receiving layer 15 having a desired film thickness is formed under the conditions of the above-mentioned viscosity and the number of rotations during drying, the problem that the coating and the sewing cloth are diffused to the outermost periphery of the substrate 10 may cause defects. The possibility of uneven thickness. Further, when the printing receiving layer 15 is formed by the spin coating method, it is preferable that the exhaust wind speed of the WI center outwards 97139305 24 200929205 in the outer riding position of the information recording medium Ι, π is 4 m/s. Implemented in the above environment. Here, the "outer peripheral portion" refers to a place of about 1 mm to 10 mm directly above the outer peripheral edge portion of the information recording mediums I and II. The measurement of the exhaust air velocity can be measured using a commercially available anemometer. The method of controlling the exhaust air velocity can be appropriately selected, and for example, it can be applied to a spin coater described in Japanese Laid-Open Patent Publication No. 2007-237103.

By forming the print-receiving layer 15 under the above-described environment, it is possible to suppress defects caused by the coating liquid droplets generated when the print-receiving layer 15 is formed, whereby an information recording medium having good appearance can be obtained. Further, when the print-receiving layer 15 is formed by the spin coating method, it is preferable to use an information recording medium (the exhaust air velocity of the center of the information recording medium I, 11 _ from the center of the 11 to the outer peripheral direction of 10 m/s or less). If it is carried out in an environment with an exhaust air velocity of l〇m/s or less, when the optical disk is loaded into the spin coater or removed from the spin coater, the light can be prevented from being detached by the pure (four) blow. In the present embodiment, the protective layer is provided on the printing receiving layer 15 as needed. The protective layer may contain known fine particles, expanded resin, organic resin fine particles, etc. Among them, acceptance from the ink. From the viewpoints of properties, ink penetration, etc., it is preferable to mainly be inorganic fine particles or organic resin fine particles. When the film is secured, the coating on the printing receiving layer 15 is preferably 〜1〇g/m2, especially 2 In the present embodiment, it is preferable to form the printing receiving layer 15 =. The coated (four) _ multifilament grade 97139305 25 200929205 ~ 30 ° C is preferable. If the drying temperature is too low, the drying time If it is stretched, there will be a tendency to reduce productivity. If the drying temperature is too high, the quality of the optical information recording layer 11 having a low heat resistance deteriorates. 'When the information is recorded or reproduced, there is a tendency of 'error' often occurs (undercoat layer 14). Next, for the undercoat layer 14 In the present embodiment, the undercoat layer is provided under the printing receiving layer 15. By the fact that the bottom layer 14 of the undercoat layer 14 is placed again, when the substrate surface type information recording medium I shown in Fig. The adhesion between the printing receiving layer 15 and the protective layer 13 is increased 'and the gloss of the printing receiving layer 15 is increased. Further, when the film-receiving type information recording medium „ as shown in FIG. 2 is used, the printing receiving layer 15 is printed. The adhesion between the substrate and the substrate ίο increases and the gloss of the printing receiving layer 15 is increased. The surface roughness of the undercoat layer 14 is preferably 1 〇 or less, particularly preferably 0. The following is preferably 1 by the undercoat layer 14 The printing receiving layer 15 can provide high color development and gloss like photo paper. The surface roughness of the undercoat layer 14 is generally reduced by the viscosity of the ink, and is elongated from the formation of the undercoat layer 14 to drying or Roughness can be reduced by the uniform coating time until hardening. Here' The rough surface degree Ra is the finger claw, Xie: 2001. The average surface roughness of the surface. The surface roughness is h. The measured value of the ray diameter gauge is / the value of the reference length is ―. The measurement of the rough surface degree is based on the measurement of the portion from the non-discovery to the damage without the extreme high convex portion or the deep four-free portion 97139305 26 200929205. In addition, when the surface shape has directivity, the surface roughness Ra The method of forming the undercoat layer 14 is not particularly limited, and a conventionally known method can be used. Generally, it is preferable to use a known radiation hardening resin from the viewpoint of productivity. Screen printing or lithographic printing forms the undercoat layer 14. In addition, • Radiation-hardening resin is a resin that is cured by electromagnetic waves such as ultraviolet rays, electron beams, X-rays, r-rays, and infrared rays. The radiation is preferably ultraviolet rays or electron beams. When the undercoat layer 14 is formed by using a radiation-curable resin and screen printing, it is necessary to appropriately set the time during which the printed resin is uniformly applied from the viewpoint of smoothness of the information recording medium. The composition of the radiation-curable resin used in forming the undercoat layer 14 is a resin obtained by mixing an acrylate-based monomer and an acrylic oligomer, and a polymerization initiator. Among them, the acrylic single system may, for example, be an ester acrylate monomer or an epoxy acrylate monomer. The acrylic oligomer may, for example, be an ethylene glycol acrylate copolymer or an amino phthalate acrylate oligopolymer. The polymerization initiator may, for example, be a cyclohexylphenyl group, a transyl-2-methyl-1-phenylpropanone, or a 2-ethoxyethyl ketone-based polymerization initiator. 2, 4-diethyl 9-oxo sulfur ° mountain ° star and other 9-oxo sulfur ° mountain " galaxy polymerization initiator. Further, a component of the radiation-curable resin may further contain a coloring agent such as titanium oxide. In the present embodiment, the undercoat layer 14 contains an antifoaming agent or a leveling agent. 6质量质量为 [优选优选为1·6质量百分比以下, Especially, the amount of the total solid content of the undercoat layer μ is 2.6% by mass or less. It is better to use U quality (four). However, the content of the antifoaming agent or the leveling agent is usually 1. 1% by mass or more and preferably 0.5% by mass or more. If the content of the antifoaming agent or the leveling agent contained in the money coating layer 14 is too large, the adhesion between the printing receiving layer 15 and the undercoat layer 14 may be lowered, or the layer 15 may be applied for printing. When the coating liquid is plucked and the coating is not uniformly applied, if the content of the coating agent is too small, the gloss of the printing receiving layer 15 tends to be deteriorated due to the influence of the surface roughening of the undercoat layer 14. • In the embodiment of the invention, the user who is regarded as an antifoaming agent or a leveling agent is generally referred to as a material f having a small surface tension. Further, when the interfacial tension of the ink main agent added to the undercoat layer 14 is large, the substances are likely to be dispersed in the ink, and the defoaming effect is more easily exhibited. Further, when the ink main agent interface tension added to the undercoat layer is small, these substances are diffused into the ink, and the leveling effect is easily exhibited. ❹ > This is because the phase _ substance can function as an antifoaming agent and can also function as a leveling agent. Thus, in the present embodiment, the singly-based substance is referred to as "antifoaming agent or leveling agent". Since these are all small in surface tension, if the surface of the undercoat layer 14 is oozing out, the coating liquid coating property applied to the undercoat layer 14 is greatly affected. The type of the antifoaming agent or the leveling agent used in the present embodiment may be, for example, a Shixia system, a modified hair system, a gas system, or a non-shixi system. Among these, 'preferably a broken system, a modified stone system, a defoaming agent or a coating agent 97139305 28 200929205, because a small amount is added to the undercoat layer 14 to have an effect, compared to the non-lanthanide system. In case of, the amount of addition can be reduced. Further, examples of the non-lanthanide type include acrylic type, vinyl type, and the like. - Further, in addition to these, specific examples include 2-ethylhexanol, diisobutyl sterol, oleic acid, turpentine oil, sorbitan lauric acid monoester, sorbose alcohol Anhydride oleic acid monoester, sorbitan oleate triester, low molecular weight polyethylene glycol oleate, 壬 E E low molar additive, P1 uron ic type E0 low molar addition bismuth, polypropylene glycol An organic polar compound such as a polypropylene glycol derivative or a copolymer of acrylic acid and butadiene; a (mercapto) acrylate polymer; a mineral oil-based defoaming agent; Among them, a (fluorenyl) acrylate polymer is preferred, and a (mercapto) acrylate copolymer is preferred. The ester moiety of (mercapto) acrylate can be selected from carbons such as mercapto, ethyl, propyl, butyl (third, iso), pentyl, hexyl, heptyl, octyl, 2-ethylhexyl Number 1 to 10 in a linear or branched alkyl group. The (meth) group acrylate is preferably a copolymer of a carbon number of 1 to 4 linear alkyl ester of acrylic acid and a carbon number of 4 to 10 branched alkyl ester of acrylic acid. Among them, a copolymer of (fluorenyl) ethyl acrylate and (mercapto)acrylic acid 2-ethylhexyl ester is preferred. Particularly preferred is a copolymer of ethyl acrylate/ethyl methacrylate/2-ethylhexyl acrylate/nonylethyl acrylate. The weight average molecular weight is usually 1,000 or less, preferably 800 or less, and usually 150 or more. The film thickness of the undercoat layer 14 is preferably O.lem to 100/zm, particularly preferably 1/zm 97139305 29 200929205 to 50/zm, more preferably 3/zm 2 2 〇 ^ m. Further, the undercoat layer i4 may be formed of a single layer or a multilayer structure formed of a plurality of layers. By providing the undercoat layer 14 as a multilayer structure, it is possible to arrange a layer having high adhesion to the printing receiving layer 15 and a good wettability at the interface with the printing receiving layer 15 on the other hand, and the protective layer 13 Or the interface between the substrates 10 can be configured with an additional gloss or a colored layer for the background color or the like.如此 Thus, by allowing the layers to share various functions, the degree of freedom of development of the undercoat layer 14 can be increased, and those having superior performance can be provided. That is, when the undercoat layer 14 is used in a multilayer structure, 'as long as the amount of the antifoaming agent or the leveling agent contained in the undercoat layer 14 closest to the printing receiving layer 15 is in the above range, the other primers may be used. The layer 14 may be used even if the amount of the leveling agent or the antifoaming agent exceeds 26% by mass. On the other hand, when the undercoat layer 14 is provided in a single layer, the bottom (four) 14 can be provided by a printing operation, which is simple and low in cost. In addition, compared to the case of a multilayer structure, the mechanical properties of the optical disc are less affected. (Substrate 10) In the case of the shape L alone, a material having a moderate workability and rigidity, a metal, a glass, or the like can be used as the material of the substrate 1〇. When the map! In the case of the substrate surface incident type information recording I, it is usually required to be transparent to the Saki / Regeneration ray. In other respects, when the film surface is shown in Figure 2, the recording medium U is ' The laser light L for recording/reproduction is not limited in terms of transparency refraction. ', double 97139305 30 200929205 The thickness of the substrate 10 is not particularly limited, and it is usually set to a range of 〇5 mm or more and 1.3 mm or less. The guide groove is generally formed on the substrate 10. The groove is usually disposed on the substrate 1 according to a concentric or spiral groove. The distance of the guide groove is recorded by the information recording mediums I and II. Specifically, in the CD (Compact Disk) information recording mediums I and II, the distance is usually 1.4#m or more. The DVD (Digital ❿Versatile Disk) is an information recording medium π, The gauge distance is usually 0.7/zm or more and 〇.8#m or less. The information recording medium for blue lasers has a gauge length of 〇.lem and below. On the other hand, the groove depth of the guide groove. It is also used for recording/reproduction of information recording media π, π Specifically, in the cd-based information recording media I and II, the 'ditch depth is usually 1 〇 nm or more and 3 〇〇 nm or less. In the DVD-based information recording media I and II, the groove depth is usually 1 〇 nm ❹ or more and 200 rm or less. In the information recording medium I for blue lasers, the groove depth is usually 10 nm or more and 200 nm or less. Further, when a guide groove is formed on the surface of the substrate 10, the following is as follows. Specifically, when metal or glass is used as the material of the substrate 10, a thin resin layer of a photocurable resin or a thermosetting resin is usually provided on the surface of the materials, and a groove is formed on the resin layer. When plastic is used as the material of the substrate, the shape of the substrate 10 and the guide groove of the surface can be formed at one time by injection molding. The plastic material that can be used for injection molding is as in the case of the conventional 97139305 31 200929205 on CD or A polycarbonate resin, a polyolefin resin, an acrylic resin, an epoxy resin, or the like used for a DVD or the like. Further, the substrate 10 generally uses an annular shape having a center hole in the center. The ring shape is not particularly limited. Various shapes such as a disk shape, an elliptical shape, and a polygonal shape are considered. However, the substrate 10 is usually in the shape of a disk. In this case, the diameter of the substrate 1 is usually set to about 80 or 120. (Light Information Recording Layer) 11) © Next, the optical information recording layer 11 will be described. The optical information recording layer 11 is made of a material that changes the optical characteristics and physical properties by the irradiation of the laser light L, and can record the resultant digital information. The material of the information recording layer u can be roughly classified into an organic pigment material used in a write-once information recording medium and an inorganic substance used in a writable information recording medium. The organic pigment material used in the single-write information recording medium can be exemplified by, for example, phthalocyanine pigment, naphthoquinone blue pigment, yanlin pigment, and the like; Polystyrene-based pigments such as horny rust pigments; lanthanide pigments, chamomile rust-based pigments, and metal-containing azo-based phthalocyanine-based pigments. In particular, it is preferably a metal-containing azo-based colorant because of its excellent durability. When the optical information recording layer 11 is formed using an organic dye material, a solution in which an organic dye material is dissolved in a suitable solvent is usually used, and a coating method such as spin coating, spray coating, and coating is applied. In this case, the solvent is usually, for example, 97139305 32 200929205: a solvent such as a propyl group, a benzyl group, or the like; a methyl siaphthyl alcohol, a solvent such as a spirulina; a tetra-propanol; Perfluorocarbon such as octafluoropentanol • 'Methyl ester, isobutyric acid, etc.—based solvent. There is no special feature; the thickness of the recording layer U is appropriately selected according to the recording method, etc., and the I, / limit ' is sufficient to obtain a sufficient degree of modulation, usually set to 1 (10) ❹ the penetration is better than 5 nm, especially More than 1Gmn is preferred. However, from the viewpoint of light, the thickness of the optical information recording layer 11 is usually 1/m or less, preferably 0.5 or less, more preferably 1 nm or less. Further, as the optical information recording layer u of the write-once information recording medium, a film of an inorganic material can also be used. Examples of the film of the inorganic material include a chalcogenide alloy film such as Ge Te Ge Sb · Te; a bilayer film such as Si/Ge or Μ〆%; a (partial) nitride film such as BiGeN or SnNbN; and Te〇x , M (partial) oxide film, etc. These films are usually formed by sputtering. In this case, the film thickness of the optical information recording layer u is usually 1 nm or more, preferably 0.1 or more, and usually 50 or less, preferably 2 or less. The inorganic substance used in the rewritable tribute recording medium is a material that can be reversibly recorded/erased. Examples of such a material include phase change materials such as SbTe-based, lanthanide, GeSbTe-based, InSbTe-based, AgSbTe®, AgInSbTe-based, GeSb-based, GeSbSn-based, InGeSbTe-based, and InGeSbSnTe-based. These are usually formed by sputtering. (Light-reflecting layer 12) In the present embodiment, the material constituting the light-reflecting layer 12 preferably has a high reflectance at the wavelength of the reproducing light and a reflectance at the wavelength of the recording and reproducing light in the recording 97139305 33 200929205 702. In the visible light (especially the blue wavelength region 当作) used for recording and reproducing light, those having high reflectance, such as Au, Ag, A1, and the like, are mainly alloys. Among them, an alloy containing Ag as a main component is preferable because the reflectance is smaller than that of the ❹ ❹ ❹ Furthermore, in the alloy containing Ag as a main component, other elements are added, and the β-light-reflecting layer 12 can be used for moisture, oxygen, and The corrosion resistance of sulfur or the like may be, for example, Au, Cu, rare earth elements (especially), sin, element V, Mo, Μη, Mg, Cr, Bi, Al, Si, Ge. Wait. Other elements /, the amount is usually 0. 01 atom% ~ 10 wide, sub%. Since the A Ag system has a flat (four) property by the addition of the additive, the amount of the other elements is increased by 〇·1 atom% or more, particularly preferably 〇·5 atom% or more. Further, in addition to this, the light reflecting layer 12 can also use a dielectric mirror which is a dielectric layer. The film thickness of the plurality of light reflecting layers 12 is preferably 7 nm or less, and particularly preferably. Further, it is preferable that the lower limit of the thickness of the layer to be formed in the layered type (10) or less to be formed later is = layer_surface, preferably 5:2. Bu is formed by a method such as forging with a 1 nm light reflecting layer 12 system. , sewing method, ion method, electron beam evaporation 97139305 34 200929205 (protection layer 13) The protective layer 13 is incident on the substrate surface type information recording medium j shown in FIG. 1, and the film surface incidence type information shown in FIG. In the case of recording the medium π, since the required characteristics are different, the following will be separately explained depending on the situation. (Protective layer 13 in the case of the substrate surface incident type) In the case of the substrate surface incident type information recording medium j shown in Fig. 1, the material constituting the protective layer 13 can protect the light reflecting layer 12 and the optical information recording layer. The premise of external force damage τ, the rest has no restrictions. Such a material may, for example, be an organic material such as a thermoplastic resin, a thermosetting resin, an electron beam curable resin, a fat or an ultraviolet ray (hereinafter referred to as "UV"), or a sulphuric stone. Inorganic materials such as magnesium fluoride (secret) and tin oxide (Sn〇2). When the material constituting the protective layer 13 is made of a thermoplastic resin, a thermosetting tree, or the like, the material is dissolved in a suitable solvent to prepare a coating for recoating on the light reflecting layer 12. The protective layer 13 is formed by drying. ❹ When the material constituting the protective layer 13 is made of a smear-hardening property, the UV-curable resin is applied directly onto the light-reflecting layer 12 (or prepared by dissolving in a suitable solvent). The protective layer 13 is formed by hardening by irradiation with light. The UV curable resin may, for example, be an acrylic vinegar such as acryl acetate, acrylonitrile acrylate or polyacetal vinegar. These materials may be used singly or in combination of plural kinds. Further, the protective layer 13 may form a single layer or form a plurality of layers. 97139305 35 200929205 The formation of the protective layer 13 τ J for example: spin coating Luo Rong coating method; sputtering method, chemical vapor chain (four) * ^ main method 0 Μ 13 ^, / and so on. Among them, the spin coating method is preferred. The thickness of the protective layer 13 requires a certain degree of thickness in order to maintain the 11 π force, so that the hanging is again at 1. 1//m or more, and n is more than 3#m. However, the film thickness of the protective layer 13 is usually set to 1 〇 n ^ to < 1 or less, preferably 30 or less. If the film thickness of the edge-preserving layer 13 is too thick, it is not only obtained by the setting of the protective layer 13 but also changed, and it takes a long time to form the protective layer 13 system, which causes cost. Increased tendency. (Protection layer 13 when the film surface is incident) 膜 η 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜 膜The strength of the double external force damage 'and the property of the laser light for recording and reproducing L are transparent and the birefringence is small. The method of forming the protective layer 4 is usually a method in which a plastic plate (hereinafter referred to as "sheet") is attached to the optical information recording layer 11 by using a sword, and a thermocomb resin or a thermosetting resin is used. A coating liquid prepared by applying a coating liquid prepared by a curable material such as an electron beam curable resin or an enamel-curable resin to the optical information recording layer 11 to be cured by light, radiation, or heat (4). The protective layer 13 is preferably a light-emitting wavelength λ at the time of recording and reproduction, and preferably has a transmittance of 70% or more, particularly preferably 8% or more. For the plastics used as the sheet materials, for example, polycarbonate, Juhui 97139305

iO*3AC 36 200929205 Hydrocarbon, acrylic, cellulose triacetate, polyethylene terephthalate, etc. The subsequent agent may, for example, be a photocurable resin, a radiation curable resin, a thermosetting resin, a pressure sensitive adhesive or the like. Among them, the pressure-sensitive adhesive may be, for example, an adhesive composed of various polymers such as acrylic acid, methyl acrylate acid, rubber, sylvestre, and urethane. When the sheet is bonded to the optical information recording layer 11 by an adhesive method by a bonding method, for example, a photocurable resin belonging to the adhesive is dissolved in a suitable solvent to prepare a coating liquid, and then the coating liquid is prepared. The coating liquid is applied onto the optical information recording layer 11 to form a coating film, and the sheet is superposed on the coating film. Then, if necessary, the medium is rotated while the sheet is superimposed, and the coating liquid is further extended and then irradiated with ultraviolet light by a UV lamp to cure the photocurable resin. In the case where a pressure-sensitive adhesive is used, a sheet having a pressure-sensitive adhesive previously applied thereon is superposed on the optical information recording layer U, and then pressed and crimped according to the appropriate pressure. The adhesive exemplified as the pressure-sensitive adhesive is preferably an acrylic or methacrylic polymer adhesive from the viewpoint of transparency and durability. More specifically, 'polymer adhesives are the main component monomers (such as 2-ethylhexyl acrylate, n-butyl acrylate, isooctyl acrylate, etc.), and polar monomers (for example, acrylic acid, methacrylic acid). It can be obtained by copolymerization of acrylamide derivatives, maleic acid, bupropion acid, ethyl ester, glycidyl acrylate, and the like. The glass transition temperature T g of the polymer adhesive, the viscosity property (when the pressure is low, the pressure is 97139305 37 200929205, the force), the peel strength, the shear resistance, etc., the ratio depends on the molecular weight, the short chain component of the main age The ratio is controlled according to (4) acidity (4). Examples of the solvent in which the acid=six-based polymer is dissolved include ethyl acetate, vinegar, ketone, and cyclohexanone. Further, the polymer adhesive preferably has a polyisocyanate crosslinking agent. ❹ ❹ 将 将 将 将 将 将 将 将 将 将 将 将 将 将 将 使用 使用 使用 使用 使用 使用 使用 使用 使用 = = = = = = = = = = = = = = = = = = = = = = = = = = After drying, it is attached to the optical information recording layer and pressure is applied by a roller or the like to be hardened. When the sheet of the adhesive is placed on the optical information recording layer u, the following is: = Air _ _ 丝, preferably in the real Μ 贴. After the occurrence of the film, the adhesive is applied to the release film, and the solvent desiccant layer is formed into a material, and then the axis is removed, and the sheet and the adhesive body are attached to the optical information recording layer 11 again. on. When the protective layer 13 is formed by a coating method, a spin coating method or the like can be used. In particular, when the protective layer 13 is formed on the disc-shaped medium: (4) the enamel coating method is preferred. The material 枓' obtained by the coating method to form the protective layer 13 is as in the case of the above (4), and is, for example, an amine resin or an acid tree. The coating material is applied to the optical information recording layer u by using the coating liquid prepared by the coating, and the coating layer is irradiated with ultraviolet rays, electron beams, radiation, or the like to promote the polymerization of the radicals 97139305 38 200929205. Or cationically polymerizing and hardening to form the protective layer 13. Further, 'on-demand' may be provided on the incident light side surface of the protective layer 13 by further providing a hard coat layer having a thickness of about 0.1 m to 50 m. By the setting of the " hard coat layer, the scratch resistance of the protective layer 13, the fingerprint adhesion resistance, and the like are improved. The thickness of the protective layer 13 is appropriately selected in accordance with the wavelength of the laser light for recording and reproducing L and the NA (the number of openings) of the objective lens, and is not particularly limited. Usually, it is preferably in the range of 3 mm, especially 〇. 〇5mm~0. 15mm is better. In this case, the overall thickness including the thickness of the adhesive layer or the hard coat layer is preferably set within an optically acceptable thickness range. For example, the so-called Blu-ray (Blu-ray) is preferably controlled to the left and the right. (Other Structures) The information recording media I and II described in the present embodiment may have any enamel layer in addition to the above-described respective layers without departing from the gist of the present invention. For example, between the above layers, an interface layer may be inserted in order to prevent contact/diffusion between the layers or to adjust the phase difference and reflectance. Further, the present invention can also be applied to a laminated type information recording medium having two or more optical information recording layers. In this case, each layer other than the print receiving layer 15 and the undercoat layer 14 can be realized by appropriately changing the material, the film thickness, and the like. In any case, as long as it belongs to the outermost surface of the information recording medium on the side opposite to the incident side of the recording and reproducing laser light L, the structure of the printing receiving layer 15 and the undercoat layer 14 is provided. 97139305 39 200929205 Further, the outer peripheral portion of the printing-receiving layer-based information recording medium described in the present embodiment is subjected to spin coating in an environment in which the exhaust air velocity from the center of the information recording medium toward the outer circumferential direction is 4 m/s or more. The method of forming the film is also applicable to "having the substrate and at least the optical information recording layer and the print receiving layer on the substrate", wherein the printing receiving layer contains an inorganic having an average secondary particle diameter of 5 〇〇 nm or less. Manufacture of an information recording medium for a porous layer of microparticles and polyvinyl alcohol.实施 (Examples) Hereinafter, the present invention will be more specifically described based on examples. However, the invention is not limited to these. In the description of the examples or the comparative examples, "parts" and "%" mean the solid parts by mass and the solid parts by mass. (Example 1) A recording medium having a thickness of 〇·45 and a depth of I55 nm and having a thickness of 1.2 mm was produced by injection molding using a polycarbonate resin. On the substrate, an alcohol solution containing a metal azo dye was applied by spin coating, and dried to form an optical information recording layer having a thickness of 70 nm. Next, silver sputtering was performed on the optical information recording layer to form a light reflecting layer having a thickness of 6 〇 nm. Next, on the light-reflecting layer, an ultraviolet curable resin (trade name: SD33〇〇, manufactured by Dainippon Ink and Chemicals Co., Ltd.) is applied by spin coating (4), and ultraviolet rays are hardened by irradiation with an external line when high-pressure water is used. The resin is hardened to form a protective layer of thickness. 97139305 40 200929205 Then, the undercoat layer will contain an ultraviolet curable ink which is a non-stone-based acrylic acid-based defoamer or a leveling agent 2.6 and has a main component of C (tetra) g-based monomer ( 3⁄4 External hardening composition: Trade name of Shijo Chemical Co., Ltd., conventional ink VID F32 TH), screen printing on the protective layer 'Printing' and then hardening by ultraviolet irradiation using a high-pressure mercury lamp to form a film thickness L〇em's white primer. The surface roughness of the undercoat layer is included in all of the following examples and comparative examples at 0. 08 # m~0. 12 y m 范 ❹. In addition, the physical properties of the foaming agent or the leveling agent contained in the ultraviolet curable ink (ultraviolet curable composition: trade name of Shiyan Chemical Co., Ltd.: conventional ink VIDF32TH) are as follows: Main component: Acrylic acid-2 -ethylhexyl acrylate / 2-ethylhexyl methacrylate / ethyl acrylate / ethyl methacrylate copolymer · Weight average molecular weight of 550 Ο • Appearance: colorless liquid

• Specific gravity: 0. 99~1. 03 • Boiling point: 205 ° C • Insoluble in water, soluble in most organic solvents • Almost no skin irritation, formation of a printing receiving layer, addition of diterpene in water Dilute propyl chloride homopolymer (molecular weight 9000) 4 parts, and wet vermiculite (precipitation method vermiculite, suction _ _ _ _ 97139305 41 200929205 20 〇 ml / 1 GGg, average - sub-particle diameter 16nm, The average agglomerated particle size was 9_) 1 part, and the predispersion liquid was prepared using a smear-type disperser (blade peripheral rate 3 Gm/sec). Next, the obtained pre-dispersion liquid was treated by a bead mill to obtain a vermiculite dispersion liquid j having a solid concentration of 30%. ❹ ❹ Next, add 4 parts of dimercapto diallyl (molecular weight 9000) to water, and gas phase method stone (average primary particle size 12 Å, specific surface area 200 m / g) l〇 G-injection was made by using a mineral-toothed blade type disperser (blade peripheral speed of 3〇ra/sec) to prepare a pre-dispersion liquid, and then using a high-pressure machine to obtain a solid dispersion with a solid concentration of 25%. 2. The above-mentioned Shi Xi Shi dispersion liquid i and Shi Xi Shi dispersion liquid 2 were mixed at room temperature according to the following printing receiving layer formula 1, and a printing receiving layer coating liquid having a solid content concentration of 16% was prepared and used. Information recording media. <Print Acceptance Layer Formulation 1> 40 parts 60 parts 22 parts 3.5 parts 3 parts vermiculite dispersion 1 (calcium solid content) Vermiculite dispersion 2 (calcium solid content) polyvinyl alcohol ( Among them, the degree of saponification is 88%, and the average degree of polymerization is 3,500) bismuth borate acetate (ZA30, manufactured by Daisei Element Chemical Co., Ltd.) (average secondary particles are 5 () (nm) or less (four) stones, and constitute a printing receiving layer. The total solid content of the fraction of 97139305 42 200929205 was 78% by mass. The above-mentioned printing-receiving layer coating liquid was applied by spin coating on the undercoat layer of the information recording medium formed to the undercoat layer in accordance with the foregoing operation. The viscosity of the printing receiving layer coating liquid was 400 mPa·s. In addition, the spin was performed for 3 seconds according to the spin rotation number of 9 rpm. At this time, the outer peripheral portion is evacuated in the coating cup, and the exhaust wind speed from the center of the information recording medium toward the outer peripheral direction is 3 m/s in the outer peripheral portion of the information recording medium, and then 2 G is placed at room temperature of 25 ° C. In minutes, an information recording medium i having a print acceptance layer is produced. Further, the coating conditions of the printing-receiving layer coating liquid are controlled so that the film thickness of the printing-receiving layer formed on the undercoat layer is in a left-right state. The coating conditions of the printing receiving layer coating liquid are the same in the following examples and comparative examples. In addition, the above-mentioned printing receiving layer formula 1 towel was prepared and prepared into a coating liquid of Shishishi dispersion liquid 1 (100 wounds) and Shi Xishi dispersion liquid 2 (distribution), in accordance with the same operation as described in ' The coating was applied to the undercoat layer and dried. The average secondary particle size of the crushed stone by the observation of the surface electron microscope is ΙΟΟηη^ (Example 2) Preparation of the information recording medium before the domain printing receiving layer - phase before the bottom coating Information recording media, use as an example! The same thing. The antifoaming agent or the uniform coating amount contained in the ultraviolet curable ink (ultraviolet curable composition: trade name of Shijo Chemical Co., Ltd.: conventional ink VID F32 TH) t used in Example 1 was changed. For the quality of 97139305 43 200929205%% 'Print the UV-cured oil.m screen printing on the lye layer 1j' by hardening with ultraviolet light from a south-pressure mercury lamp to form a white film with a thickness of 1 〇β m Undercoat. - Printing Acceptance Layer Formation The information recording medium 2 of Example 2 was obtained by forming a printing receiving layer on the undercoat layer in the same manner as in Example 1. (Example 3) ❹ - Information recording medium before forming a print-receiving layer. An information recording medium before the formation of the undercoat layer was used, and the same thing as in Example 1 was used. Then, the ultraviolet curable ink (ultraviolet curable composition: trade name of Shika Chemical Co., Ltd.: conventional ink VID F32 TH) used in Example 1 was printed on the protective layer by screen printing by using a high pressure mercury lamp. The ultraviolet light is irradiated and hardened to form a white undercoat layer having a film thickness of 10 # m. © - Print receiving layer formation 1 The information recording medium 3 of Example 3 was produced in the same manner as in Example 2 t except that the exhaust wind speed in the outer peripheral portion of the information recording medium was changed to 4 m/s. (Example 4) - Preparation of information recording medium before forming the print-receiving layer - The information recording medium before the formation of the print-receiving layer was formed by using the same operation as in the third embodiment. 97139305 44 200929205 A print-receiving layer is formed. In addition to the use of the following print-receiving layer formulation 2 in the third embodiment, the information recording medium 4 <print receiving layer is obtained according to the phase operation. Formulation 2 > '100 parts 20 parts 3 parts 3 parts vermiculite dispersion 1 (depending on the solid content) polyvinyl alcohol (where 'saponification degree 88%, average polymerization degree 3, 5 〇〇) ❹ 硼 boric acid acetate oxygen 25 parts of zirconium (ZA30, manufactured by Daisei Element Chemical Co., Ltd.) is an industrial alcohol having a printing receiving layer (the total solid content of the second stone component having an average primary particle diameter of 50 Onm or less is 79% by mass) (Example 5) In Example 2, the undercoat layer was carried out in the form of an antifoaming agent or an average mass%, and the rest was carried out as in Example 24, and the operation of forming the undercoat layer and the printing receiving layer was performed. The same recorded media 5. 1 information (Comparative Example 1), ... 2, the Japanese 叩 明 明 犯 犯 剂 剂 岣 岣 岣 岣 岣 进行 进行 进行 进行 进行 之外 之外 之外 之外 之外 之外 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施The comparison example of coating and printing receiving layer is the same as that of 97139305 '^讯S己200929205. (Comparative Example 2) Except that in Example 2, the undercoat layer was formulated in the same manner as in Example 2 except that the undercoating agent was formulated in such a manner that the amount of the antifoaming agent was 0.4% by mass. The information recording medium 7 of Comparative Example 2 having a primer layer and a print receiving layer. (Comparative Example 3) 资讯 An information recording medium set to the undercoat layer was formed in the same manner as in Example 2. Further, the ultraviolet curable resin composition was applied by spin coating on the undercoat layer to form a print-receiving layer, and the information recording medium 8 of Comparative Example 3 was obtained. Among them, the ultraviolet curable resin composition is blended with: an average primary particle diameter lOrnn and a fine pore volume of 3 ml/g of synthetic vermiculite 3 parts, acrylonitrile formaldehyde 35 wound, and alkylated polyvinylpyrrolidone resin 2 A portion, a hydroxyethyl acrylate moiety, a cationic resin (SAFT® MER manufactured by Mitsubishi Chemical Corporation), and 3 parts of a photopolymerization initiator were prepared. The printing receiving layer prepared here does not contain polyethyl alcohol, and belongs to the so-called swelling type, and is not porous. (Comparative Example 4) The teeth were prepared in Comparative Example 3 except that the defoaming agent or the coating amount of the undercoat layer was 2.6, and the others were the same as in Comparative Example 3, with the undercoating and printing. The layer was received, and the information of the comparative example 4 was recorded 97139305 46 200929205. (Comparative Example 5) The same operation as in Comparative Example 3 was carried out except that in Comparative Example 3, the antifoaming agent or the coating amount of the undercoat layer was adjusted to 4.0% by weight. The undercoat layer and the print receiving layer were used to prepare the information recording medium 10 of Comparative Example 5.

For each of the information recording media (1 to 1〇) obtained, the following items were evaluated. The results are shown in Table 1. <Color development A > Printing a character and landscape image on the printable label level using a commercially available inkjet printer (Epson Co., Ltd., PM-G8GG) that can be used to print on the disc. In comparison with the photograph of the silver salt prepared using the image, visual evaluation of color development was carried out according to the following criteria. ◎: It has a color development higher than that of a silver salt photograph. 〇: The same level of color development as the silver salt photo. △: The color development was slightly inferior to that of the silver salt photograph. X: The color development is significantly inferior to that of the silver salt. <Color developability B> Using a commercially available label printer (48Gi manufactured by Remage Co., Ltd.) which can print on a disc label, characters and landscape images are printed on the label level of the material, as described above. A" is evaluated according to the following criteria: ◎: It has a color development higher than that of a silver salt photograph. 97139305 47 200929205 〇: The same level of color development as the silver salt photo. △: The color development was slightly inferior to that of the silver salt photograph. X: The color development is significantly inferior to that of the silver salt. ' <Glossiness> \ Print a character and landscape image on the print acceptance level using a commercially available inkjet printer (applied by Epson Co., Ltd. PM-G800) printed on a disc label The silver salt photographs obtained by this image were compared, and the visual evaluation of the gloss was performed in accordance with the following standard. 〇: Has the same level of gloss as the silver salt photo. △: The gloss is slightly inferior to that of the silver salt photograph. X: The gloss is significantly poorer than that of the silver salt. <Drying> A commercially available inkjet printer (PM-G800 manufactured by Epson Co., Ltd.) printed on a disc label is used to perform full-surface printing of red, blue, green, and enamel on the printing receiving surface. Immediately after printing, the PPC paper stack was placed on the printing portion and lightly crimped, and the amount of ink transferred onto the PPC paper was visually observed. The evaluation is based on the following criteria. 〇: No transfer at all. X: There is partial transfer, which is difficult to use. ' <surface defect> Observing the state in which the printing receiving layer is partially plucked by the undercoat layer to be defective, and the defect that causes the coating liquid to fall during coating, and is evaluated as follows: 97139305 48 200929205 ◎: Completely free of defects. 〇: Although there are some minor defects due to droplets, it is not a problem. △: Although there are some defects, it is still within the allowable range. X: Too many defects and the degree of obstacles in image formation. [Table 1] \ Information recording medium No. Defoaming agent or coating amount (% by mass) of undercoat layer Color development A/B Glossy dry surface defect 1 1 2. 6 ◎ /◎ 〇〇Δ Real 2 2 1. 6 ◎ /◎ 33 3 2. 6 ◎ /◎ 〇〇 ◎ Example 4 4 2. 6 ◎ /〇〇〇◎ 5 5 0. 1 ◎ /◎ △ 〇〇1 6 3. 0 ◎ /◎ 〇〇X Ratio 2 7 4. 0 ◎ /◎ 〇〇X Compared with 3 8 1. 6 ◎ /◎ 〇X 〇Example 4 9 2. 6 ◎ /◎ 〇X 〇5 10 4. 0 ◎ /◎ 〇X 〇 It is known from the results of Table 1, the information modulated in the embodiment 5

The recording medium information recording medium 5 has a high color developability and a high gloss and dryness. Further, it was found that the adhesion of the printing receiving layer was high, and the label surface having less surface defects due to the scattering of the coating liquid was observed. The information recording medium 1 to the information recording medium 5 prepared in the first to fifth embodiments are prepared by using an antifoaming agent or an information recording medium 6 and 7 as compared with the information recording media 6 and 7 prepared in the comparative example 1 and the comparative example 2. When the coating amount is suppressed to 2.6 mass% or less, a label surface having less surface defects can be obtained. In particular, in the third embodiment (information recording 97139305 49 200929205 recording medium 3) and the fourth embodiment (information recording medium 4), it is known that by increasing the exhaust air velocity, defects caused by the coating liquid droplets are suppressed. The information recording medium 8 to the information recording medium 10 prepared in Comparative Example 3 to Comparative Example 5 were found to have a surface defect due to the amount of the antifoaming agent or the leveling agent because the printing receiving layer was of a so-called swelling type. Less, but dry hygiene is poor. In addition, this application is based on the Japanese patent application filed on Nov. 30, 2007 (Japanese Patent Application No. 2007-310324), and the entire contents of the case are cited in the present application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory diagram showing an example of an information recording medium to which the present embodiment is applied. Figure 2 is a schematic illustration of another embodiment of an information recording medium. [Main component symbol description] 10 Substrate 11 Wide optical information recording 12 Light reflection layer 13 Protective layer 14 Undercoat layer 15 Printed receiving layer I'll Information recording medium L Laser light 97139305 50

Claims (1)

200929205 VII. Application for Patent Park: ι An information recording medium characterized by: a substrate; and a layer on the substrate; at least an optical information recording layer, an undercoat layer, and a printed substrate The foaming agent or the leveling agent is 2.6% by mass or less; Ο ❹ The brush receiving layer contains a porous layer containing no fine particles and polyethylene glycol as a main component in an average secondary particle kneading (four) (10) or less. ',,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The stone (β) is contained in a mass ratio of (Α/ΒΜ70/30) to (30/70). 3. As disclosed in the information recording medium of claim No. 1, the printing receiving layer contains a water-soluble polyvalent metal.中上4· A kind of information-rich financial method, which is the heart of the ... shooting one, the recording media:: _ printing acceptance layer is formed by spin coating method in the money & 5. · In the media of the fourth item, the above-mentioned printing acceptance layer is in the above (4) method's information. _^ Φ Μ 5 5 The recorded area of the media has been recorded from the shell 1 _ the outer side (four) In the exhaust environment, it is formed by the above-mentioned spin coating method. The above-mentioned information recording medium has the following features: 97139305 200929205 substrate; light information formed directly or through other layers on the substrate a recording layer; and on the opposite side of the incident side of the laser light of the substrate, An undercoat layer and a print-receiving layer formed by or interposing another layer; the undercoat layer contains an antifoaming agent or a leveling agent in a range of % by mass; 〇❹ the above-mentioned printing interface layer contains an average a porous layer having a secondary particle diameter of from 20 to 500 (10) and a porous layer containing polyvinyl alcohol as a main component. 7. A method of producing an information recording medium, comprising: a substrate; and forming at least light on the substrate The information recording layer and the printing receiving layer; the brush receiving layer is a porous information recording medium containing an inorganic cerium polyethylene having an average secondary particle diameter of 5° 〇 nm or less; and the characteristic information == system: the above information recording medium Zhao’s outer peripheral part was formed by the spin coating method from the center of the 录 录 录 之 四 四 四 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4