JPH01158636A - Information recording medium - Google Patents

Abstract

PURPOSE:To protect a dye recording layer in a manner as to obviate deterioration in the recording performance thereof by providing the dye recording layer which can write and/or read information by a laser on a substrate and providing a protective layer consisting of a polymer latex thereon. CONSTITUTION:The dye recording layer which can write and/or read the information by the laser is provided on the substrate and the protective layer consisting of the polymer latex is provided thereon. Since the polymer latex is of a water dispersion type, said latex does not dissolve the dye and attack the dye layer unlike ordinary polymers of an org. solvent type. Since said latex is of the water dispersion type, the latex has the higher mol.wt. than the mol.wt. of ordinary water soluble resins and has the good water resistance as well. The water resistance and solvent resistance of the recording layer are, therefore, improved and the functions as the protective layer to protect the dye recording layer such as prevention of pickup of dust on the recording layer and flawing of said layer is sufficiently exhibited.

Description

Detailed Description of the Invention [Field of the Invention] The present invention relates to an information recording medium on which information can be written and/or read using a high energy density laser beam using a dye as a recording material, and a method for manufacturing the same. It is.

[Technical Background of the Invention] In recent years, information recording media that use high energy density beams such as laser light have been developed and put into practical use. This information recording medium is, for example, an optical disk such as a video disk or an audio disk, a large-capacity still image file, a large-capacity computer disk memory, an optical card, a micro image recording medium, a super micro image recording medium, or a micro image recording medium. It is applied to facsimiles, original plates for phototypesetting, etc.

An information recording medium basically consists of a transparent substrate made of plastic, glass, etc., and a recording layer provided thereon. Materials for the recording layer include Bi, Sn, In,
Metals or semimetals such as Te; and dyes such as cyanine, metal complex, and quinone are known.

Information is written on an information recording medium by, for example, irradiating the recording medium with a laser beam.
The irradiated portion of the recording layer absorbs the light and locally increases in temperature, resulting in a physical or chemical change that changes its optical properties, thereby recording information. Information is also read from a recording medium by irradiating the recording medium with a laser beam, and the information is reproduced by detecting reflected or transmitted light depending on changes in the optical characteristics of the recording layer.

Recently, as a disk structure for protecting the recording layer, a recording layer is provided on at least one of the two disk-shaped substrates, and the recording layer is located inside the two disk-shaped substrates. An air sandwich structure has also been proposed in which a ring-shaped inner spacer and a ring-shaped outer spacer are joined to form a space, or by using protrusions provided at the ends of the substrates.

Information recording media that use dyes as recording materials have excellent properties such as high sensitivity, as well as manufacturing advantages such as the ability to easily form a recording layer on a substrate using a coating method. It has great advantages.

However, the dye recording layer has problems such as dust easily adhering to the recording layer or being easily damaged physically. Recently, in order to prevent these problems, it has been considered to provide a protective layer on the dye recording layer. for example,
JP-A-59-203252 proposes providing a resin layer as a protective layer on the dye recording layer.

Examples of the resin include water-soluble resins and hydrocarbon solvent-soluble resins.

However, according to studies conducted by the present inventors, for example, when a protective layer is formed using an organic solvent-soluble resin, the organic solvent dissolves the dye, resulting in uneven layer thickness of the dye recording layer. , recording sensitivity cannot be sufficiently improved. In addition, water-soluble resins have the advantage of not dissolving the dye, but they have poor adhesion to the dye recording layer, and are also sensitive to humidity, so they may not be sufficiently effective as a protective layer. It became clear that

[Summary of the Invention] An object of the present invention is to provide an information recording medium that has a dye recording layer and is provided with a protective layer that has a protective function without deteriorating the recording performance of the dye recording layer. .

Furthermore, it is an object of the present invention to provide an information recording medium in which the protective layer F is provided with a functional layer and can fully exhibit its functions.

In the present invention, a dye recording layer on which information can be written and/or read by a laser is provided on a substrate,
An information recording medium on which a protective layer made of polymer latex is provided; and; a dye recording layer on which information can be written and/or read by a laser is provided on the substrate, and on which a dye recording layer made of polymer latex is provided. An information recording medium is provided with a protective layer and further provided with a functional layer on the protective layer.

The protective layer provided on the dye recording layer of the present invention is a layer made of polymer latex. Polymer latex is water-dispersible, so unlike ordinary organic solvent-based polymers, it does not dissolve the dye and attack the dye layer. Furthermore, since it is water-dispersible, it has a higher molecular weight and better water resistance than ordinary water-soluble resins. Therefore, it can sufficiently function as a protective layer that protects the dye recording layer from adhesion of dust and generation of scratches. In addition, since the polymer latex is a polymer and has excellent water resistance, solvent resistance, etc., this protective layer-F also has the functions of the above-mentioned protective layer for recording media, tracking guide layer, and reflective layer. Even if layers are provided, each functional layer can perform each desired function without adversely affecting the dye recording layer.

Furthermore, since the polymer latex protective layer of the present invention has excellent adhesion with the above-mentioned functional layer, it can be used as an adhesive layer for bonding various functional layers provided on the protective layer and the pigment layer provided below. be able to fully demonstrate its functions.

[Detailed Description of the Invention] The information recording medium of the present invention can be manufactured, for example, by the following method.

The substrate used in the present invention can be arbitrarily selected from various materials used as substrates for conventional information recording media. Optical properties, flatness, processability of the substrate,
In terms of ease of handling, stability over time, and manufacturing cost,
Examples of substrate materials include acrylic resins such as cell cast polymethyl methacrylate and injection molded polymethyl methacrylate; vinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymers; epoxy resins; and polycarbonate resins, amorphous polyolefins, and polyesters. ;
Mention may be made of glasses such as soda-lime glass; and ceramics. Further, in the case of the above plastic material, it may be in the form of a film.

The pregrooved substrate is made of injection molded plastic materials such as, for example, polycarbonate resins, polyacrylic resins, vinyl chloride resins, epoxy resins, and amorphous polyolefins (preferably polycarbonate, polymethyl methacrylate, and amorphous polyolefins). It can be manufactured by a method in which a resin layer having pregrooves is laminated on a plastic plate or a flat substrate, and these methods are already generally known.

In the information recording medium of the present invention, a dye recording layer is provided on the substrate, and a protective layer for protecting the dye is provided on the dye recording layer. If necessary, a functional layer having functions such as the above-mentioned protective layer for recording medium, tracking guide layer, and reflective layer can be provided on the protective layer.

The protective layer provided on the dye recording layer of the present invention is a layer made of polymer latex. Since polymer latex is water-dispersible, it does not dissolve the dye and attack the dye layer, unlike ordinary organic solvent-based polymers. Furthermore, since it is water-dispersible, it has a higher molecular weight and better water resistance than ordinary water-soluble resins. Therefore, the water resistance and solvent resistance of the recording layer can be improved, and it can sufficiently function as a protective layer for protecting the dye recording layer, such as preventing dust from adhering to the recording layer and scratches. In addition, since the polymer latex is a polymer and has excellent water resistance, solvent resistance, etc., even if a functional layer 1- is further provided on this protective layer,
Each functional layer can perform its desired function without adversely affecting the dye recording layer.

Examples of the polymer latex include styrene-butadiene latex, acrylic latex, vinylidene chloride latex, and vinyl acetate latex. Styrene-butadiene latex is preferred.

When a tracking guide layer made of a photographic silver halide emulsion is further provided as a functional layer on the above protective layer, it is necessary that the above protective layer further contains a dichlorotriazine derivative between the dye recording layer and the functional layer. This is preferable in terms of improving the adhesion of.

The above derivatives include 2,4-dichloro-6-medoxy-1,3.5-triazine, 2,4-dichloro-6-phenoxy-1,3,5-1-riazine, 2,4-dichloro-6- dinitylamino-1.3.5-triazine, 2
．． 4-dichloro-6-phenylamino-1,3,5-triazine and 2,4-dichloro-6-hydroxy-1
, 3°5-triazine sodium salt and the like. Preferably it is 2,4-dichloro-6=hydroxy-1,3,5-triazine sodium salt. The content of the derivative is preferably in the range of 0.01 to 10% by weight based on the solid content of the latex. Generally, it is preferable to provide a UV curable resin as a protective layer on the tracking guide layer as the functional layer.

In the information recording medium of the present invention, before providing the dye recording layer,
If desired, an undercoat layer may be provided on the substrate.

Note that examples of the undercoat layer formed by the coating method include an adhesive layer, a heat insulating layer, a reflective layer, a sensitivity improving layer (gas generating layer), and the like.

Examples of polymers used in the undercoat layer include polymethyl methacrylate, acrylic acid/methacrylic acid copolymer, styrene/maleic anhydride copolymer, polyvinyl alcohol, N-methylol/acrylamide copolymer, and styrene/sulfonic acid. copolymer, styrene-vinyltoluene copolymer, chlorinated polyethylene, chlorosulfonated polyethylene, nitrocellulose, polyvinyl chloride,
Examples include polyester, polyimide, vinyl acetate/vinyl chloride copolymer, ethylene/vinyl acetate copolymer, polyethylene, polypropylene, polycarbonate, and the like. The undercoat layer can be formed using a coating solution in which these polymers are dissolved in a solvent.

As the dye used in the present invention, any dye known as a recording material for information recording media can be used. For example, phthalocyanine pigments, pyrylium pigments,
Thiopyrylium dyes, azulenium dyes, squalirium dyes, metal complex dyes with Ni and Cr, naphthoquinone/anthraquinone dyes, indophenol dyes, indoaniline dyes, triphenylmethane dyes, triallylmethane dyes Mention may be made of dyes, aminium-based and diimmonium-based dyes, and nitroso compounds.

Among these, dyes with a high absorption rate for light in the near-infrared region of 700 to 900 nm are preferred, since semiconductor lasers that emit near-infrared light have been put into practical use as recording and reproducing lasers.

Preferred examples include i) Cyanine dye: (11(C:H3)2N-((:H=GH), -(:
I(-”N((:H+)2GlOa-(where n is 2
or 3) N ((:H3) 2 1N(C1
1,3) 2[:l] C-Cl-Cl1-CH
-CRR (However, R is a hydrogen atom or N (C)13)) [4] A-((:I+ to l+-). -G +1-8
RX RX R× RRR, R is an alkyl group, X is a counter ion,
In some cases, a chlorine atom, an alkyl group, an alkoxy group, or an aryl group may be present in the benzene ring or naphthalene ring, and n is an integer of 0 to 3) RX-R (However, R is an alkyl group and , X is an anion such as halogen, verchlorate, BF6-, perfluoroalkanesulfonate, substituted or unsubstituted benzenesulfonate) RY-R (However, R is a substituted or unsubstituted alkyl group, alkoxy group, aralkyl group, alkenyl group, X is a hydrogen atom or a halogen atom, Y is a halogen, perchlorate, substituted or unsubstituted benzenesulfonate,
balatoluene sulfonate, methyl sulfate, ethyl sulfate, benzene carboxylate, methyl carboxylate or trifluoromethyl carboxylate, n is an integer from O to 3) R3X-83 (Tatashi, RI, R2 and R3 is a substituted or unsubstituted alkyl group, which may be the same or different from each other, and X- is a perhalogen ion, BF6-,
An anion such as substituted or unsubstituted benzenesulfonic acid, ion, perfluoroalkanesulfonic acid ion or alkyl sulfate ion, n is an integer of O to 3,
1) A halogen atom is present in at least one of the 4th, 5th, 6th and 7th positions of the indolenine ring, and optionally further halogen atoms may be present in other positions, and Optionally, the benzene ring may be substituted with an alkyl group, alkoxy group, hydroxy group, carboxy group, allyl group or alkylcarbonyl group) (However, A1 and A2 are each a hydrogen atom or a substituent, and Z is is an atomic group necessary to form a substituted heterocycle, RI, R4 are each a hydrogen atom or a substituent, R5 is a substituent or may form a six-membered heterocycle together with Z, X- is an anion, n
is an integer from 0 to 2) (:2840G)13(:R04-C21140(:H
3[11] Φ-double (X-)-(However,
Φ and Taira are indole ring residues, thiazole ring residues, oxazole ring residues, selenazole ring residues, imidazole ring residues, or pyridine ring residues, each of which may be fused with an aromatic ring, and L is a linking group for forming monocarbocyanine, dicarbocyanine, tricarbocyanine or tetracarbocyanine, X- is an anion, m is 0 or 1) ii) squarylium dye: C ( C113) :+OC(Ni113) 3G(
C113)3 0- [:1((1:113
)3iii) Azulenium dye: (However, R1 and R2, R2 and R3, R3 and R4, 11
Rl, R2, R3 when at least one combination of L4 and R5, R5 and R6, and R1'' and R7 forms a ring of a substituted or unsubstituted heterocycle or aliphatic ring and does not form a chain ring. , R4, R5, R6 and R7 are each a hydrogen atom, a halogen atom or a monovalent organic residue, or R1 and R2, R3 and R', R
' and R5, R5 and R6, and R6 and R7 may form a substituted or unsubstituted aromatic ring; group, and 2- is an anionic residue. Note that at least one carbon atom constituting the azulene ring may be replaced with a nitrogen atom to form an azaazulene ring. ) iv) Indophenol dye: 8-R' Y are each a hydrogen atom,
C7-C2° substituted or unsubstituted alkyl group, aryl group, heterocycle or cyclohexyl group, A is -N
HGO- or -(:0NH-) ■) Metal complex dye: R2SSR' (Tatashi, RI, and R4 are each an alkyl group or an aryl group, and M is a divalent transition metal atom. ) (R1 and R2 are each an alkyl group or a halogen atom, and M is two transition metal atoms) (R3). (R3)n(
However, R1 and R2 are each a substituted or unsubstituted alkyl group or aryl group, and R3 is an alkyl group, a halogen atom, or! -N-R5 group (wherein R4 and R5 are each a substituted or unsubstituted alkyl group or aryl group, M is a transition metal atom, and n is an integer from 0 to 3) (provided that , [Catl is a cation necessary to neutralize the complex salt, M is Ni, Cu, Co, Pd, or pt, and n is 1 or 2) (However, [Catl is a cation necessary to neutralize the complex salt. M is Ni, Cu, CO1Pd or pt, n is 1 or 2 (however, X is a hydrogen atom, a chlorine atom, a bromine atom or a methyl group, and n is 1
an integer of ~4, A is a quaternary ammonium group)
(However, xl and x2 are a nitro group and /
or a halogen atom, nl and R2 are each an integer of 1 to 3, and R1 and R2 are each an amino group, a monoalkylamino group, a dialkylamino group, an acetylamino group, a benzoylamino group (including a substituted benzoylamino group). ), and XI and X2. n, and R2 and R1 and R2 may be the same or different from each other, M is Cr or CO atom, Y is hydrogen,
(sodium, potassium, ammonium, aliphatic ammonium (including substituted aliphatic ammonium), or alicyclic ammonium)vi) Naphthoquinone-based, anthraquinone-based dye: (However, R is a hydrogen atom, an alkyl group, an allyl group, an amino group or a substituted amine group) (wherein R is a hydrogen atom, an alkyl group, an allyl group, an amino group, or a substituted amino group) OHO (wherein R is a hydrogen atom, an alkyl group, an allyl group, an amino group, or a substituted amino group) (However, X is a halogen atom, and n is an integer of 0 to 10.) (However, X is a halogen atom.) ONI (20 NH2S, etc.) can be mentioned.

Among these dyes, the method of the present invention can be particularly preferably applied to cyanine dyes. In addition,
These dyes may be used alone or as a mixture of two or more.Also, when cyanine dyes are used, the above metal complex dyes or aminium/diimmonium dyes may be used together as a quencher. You can.

The recording layer can be formed by dissolving the dye and, if desired, a binder in a solvent to prepare a coating solution, then applying this coating solution to the surface of the substrate to form a coating film, and then drying the coating solution. can.

A non-hydrocarbon organic solvent is used as the solvent for preparing the dye coating solution.

Examples of such non-hydrocarbon solvents include esters such as ethyl acetate, butyl acetate, and cellosolve acetate;
Ketones such as methyl ethyl ketone, cyclohexanone, and methyl isobutyl ketone, halogenated hydrocarbons such as dichloromethane, 1,2-dichloroethane, and chloroform, ethers such as tetrahydrofuran, ethyl ether, and dioxane, ethanol, n-propanol, isopropanol, and lobetanol. Examples include alcohols such as, amides such as dimethylformamide, and fluorine-containing solvents such as 2°2.3.3-tetrafluoropropanol. Among these non-hydrocarbon solvents, halogenated hydrocarbon solvents and fluorine-containing solvents are preferred. Note that these non-hydrocarbon organic solvents may contain hydrocarbon solvents such as aliphatic hydrocarbon solvents, alicyclic hydrocarbon solvents, and aromatic hydrocarbon solvents, as long as the amount is within 50% by volume. . Note that these solvents are appropriately selected and used depending on the substrate material used.

The coating solution also contains antioxidants, UV absorbers, plasticizers,
Various additives such as lubricants may be added depending on the purpose.

When a binder is used, examples of the binder include cellulose derivatives such as gelatin, nitrocellulose, and cellulose acetate; natural beaten polymer substances such as dextran, rosin, and rubber; and polyethylene, polypropylene, polystyrene, polyisobutylene, etc. Hydrocarbon resins, vinyl resins such as polyvinyl chloride, polyvinylidene chloride, polyvinyl chloride/polyvinyl acetate copolymers, acrylic resins such as polymethyl acrylate, polymethyl methacrylate,
Examples include synthetic organic polymeric substances such as polyvinyl alcohol, chlorinated polyethylene, epoxy resins, butyral resins, rubber derivatives, and initial clamps of thermosetting resins such as phenol-formaldehyde resins.

Examples of the coating method include a spray method, a spin code method, a dip method, a roll coat method, a blade coat method, a doctor roll method, and a screen printing method.

When a binder is used as a material for the recording layer, the ratio of dye to binder is generally 0.01 to 99% (weight ratio).
It is preferably in the range of 1.0 to 95% (weight ratio).

The recording layer may be a single layer or a multilayer, but the layer thickness is generally 0.
．． It is in the range of 0.01 to 10 μm, preferably 0.02 to 10 μm.
It is in the range of 1 μm. Furthermore, the recording layer may be provided not only on one side of the substrate but also on both sides.

The information recording medium of the present invention includes, in addition to the above information recording medium provided with a dye recording layer and a protective layer made of polymer latex provided thereon, a functional layer is further provided on the protective layer. It also includes information recording media.

Examples of the functional layer include a protective layer made of an ultraviolet curable resin or an inorganic material, a tracking guide layer, and a reflective layer.

The protective layer made of the polymer latex of the present invention has excellent adhesion with various functional layers, so it can be used as an adhesive layer that connects the various functional layers provided on the protective layer and the pigment layer provided below. Able to perform work to the fullest.

On top of the protective layer, which is made of the polymer latex of the present invention and whose purpose is mainly to prevent the adhesion of particles, etc. to the dye layer, is the A protective layer is provided as a functional layer. This protective layer may also be provided on the side of the substrate where the recording layer is not provided for the purpose of increasing scratch resistance and moisture resistance.

Examples of materials used for the protective layer include SiO, 5i02.5IN4. MgF2.5n02
etc. can be mentioned. Further, examples of the organic substance include thermoplastic resins, thermosetting resins, UV curable resins, etc., and preferably UV curable resins.

The protective layer can be formed, for example, by laminating a film obtained by plastic extrusion onto the polymer latex protective layer via an adhesive layer. Alternatively, it may be provided by methods such as vacuum deposition, sputtering, and coating.

In the case of a thermoplastic resin or a thermosetting resin, it can also be formed by dissolving these in an appropriate solvent to prepare a coating liquid, then applying this coating liquid and drying it. In the case of a UV curable resin, it can also be formed by preparing a coating liquid as it is or by dissolving it in an appropriate solvent, applying this coating liquid, and curing it by irradiating it with UV light. Examples of UV-curable resins include (meth)acrylates such as urethane (meth)acrylate, epoxy (meth)acrylate, and polyester (meth)acrylate.
Acrylate oligomers, monomers such as (meth)acrylic acid esters, etc., and ordinary U such as photopolymerization initiators.
V-curable resins can be used. Various additives such as antistatic agents, antioxidants, and UV absorbers may be further added to these coating liquids depending on the purpose.

The thickness of the protective layer is generally in the range of 0.1 to 100 μm.

The tracking guide layer as a functional layer of the present invention is provided to improve tracking performance during recording and reproduction.

As the material for forming the tracking guide layer, a photographic halogenated emulsion or the like is used. In this case, it is preferable that the protective layer of the polymer latex further contains an iffff dichlorotriazine derivative in order to improve the adhesion between the dye recording layer and the functional layer. Usually, it is preferable to provide a UV curable resin as a protective layer on the tracking guide layer as the functional layer because excellent adhesiveness can be obtained.

The reflective layer as a functional layer of the present invention is provided for the purpose of improving the S/N ratio during information reproduction and improving the sensitivity during recording.

The light-reflective material that is the material of the reflective layer is a material that has a high reflectance to laser beams, and examples thereof include Mg and Se.
, Y, Ti, Zr, Hf, V, Nb, Ta, C
r, Mo, W, Mn, Re.

Fe, Co, Ni, Ru, Rh, P
d% Ir, Pt% Cu, Ag, Au,
Zn, Cd, Affi.

Ga, In, Si, Ge, Te,
Mention may be made of metals and metalloids such as Pb, Po, Sn, Bi, etc. Among these, preferred are 82, Cr and Ni. These substances may be used alone, or in combination of two or more or as an alloy.

The reflective layer can be formed on the recording layer by, for example, vapor deposition, sputtering, or ion-blating the above-mentioned light-reflective material.

The thickness of the reflective layer is generally in the range of 100 to 3000 mm.

The thickness of the protective layer is generally in the range of 0.1 to 100 μm.

In the present invention, the information recording medium may be a single board having the above-mentioned structure, or alternatively, two substrates having the above-mentioned structure may be placed facing each other so that the recording layer is on the inside, and adhesive or the like is used. By joining, a laminated type recording medium can also be manufactured. Alternatively, an air sandwich type recording medium is manufactured by using a substrate having the above configuration as at least one of two disc-shaped substrates and joining them via a ring-shaped inner spacer and a ring-shaped outer spacer. You can also.

Examples and comparative examples of the present invention are described below. However, each of these does not limit the present invention.

[Example 1] 1 g of cyanine dye (above structural formula [5]: % formula %) was mixed with 1 g of 2,2,3.3-tetrafluoropropatur
A coating liquid (concentration: 1% by weight) was prepared by dissolving it in 00cc.

The coating liquid was applied onto a disc-shaped polycarbonate substrate (outer diameter: 130 mm, inner diameter = 15 mm, 7J° 1.2 mm, track pitch: 1.6 μm, group depth = 800λ) provided with a tracking guide. After coating at a rotation speed of 2000 rpm using a spin code method, the coating was dried at a temperature of 70° C. for 10 minutes to form a recording layer having a film thickness of 600 mm.

Danmaratex coating liquid Styrene-butadiene latex 100 parts by weight (
Solid content: 10wt, %, N1pol LX407G, manufactured by Zeon Corporation) The above polymer latex coating liquid was applied onto the obtained recording layer at a rotational speed of 700 rpm by a spin cord method, and then heated at a temperature of 120°C. After drying for 5 minutes, the film thickness is 20
A protective layer of .mu.m polymer latex was formed.

Ultraviolet curable resin coating Q liquid trimethylolpropane I5 parts triacrylate dipentaerythritol 15 parts by weight hexaacrylate tetrahydrofurfuryl 10 parts by weight alcohol penzoinisobrobyl ether 2 parts by weight Further, the above UV curing is applied on the above protective layer. A mold resin coating solution was applied, and the coating layer was cured by irradiation with a 2 kW ultraviolet lamp for 10 seconds to provide an ultraviolet curable resin protective layer as a functional layer with a layer thickness of 5 μm. In this way, an information recording medium consisting of a substrate, a recording layer, a latex protective layer and an ultraviolet curable resin protective layer was manufactured.

[Comparative Example 1] Type t'1 Blood Paint 1 - Polyvinylidene chloride-vinyl chloride copolymer 10 parts by weight Methyl ethyl ketone 100 parts by weight In Example 1, the above solvent-based resin coating liquid was applied instead of the polymer latex protective layer. An information recording medium was manufactured in the same manner as in Example 1 except that a protective layer was provided.

[Comparative Example 2] Water” U1 San U1 coating-IfiU Polyvinyl alcohol 10 parts by weight Water
100 parts by weight An information recording medium was produced in the same manner as in Example 1 except that the above-mentioned water-soluble resin coating liquid was applied instead of the polymer latex protective layer to form a protective layer.

[Example 2 Kobo Rimara Ni 32k] 11 ml Styrene-butadiene latex 100 parts by weight (
Solid content: 10wt%, N1pol LX407G, Nippon Zeon ■) 2.4-dichloro-6-hydroxy-1゜3.5-triazine sodium salt 4 parts by weight water
100 parts by weight In Example 1, a 100 μm PET film was used instead of the substrate used in Example 1, a recording layer was formed thereon in the same manner as in Example 1, and the above polymer latex was coated on it. Rotate the liquid at a rotation speed of 2000 r using the spin code method.
After coating at a speed of 100 pm, the coating was dried at a temperature of 120° C. for 5 minutes to form a protective layer of polymer latex having a thickness of 0.2 μm.

Photographic Halogenated Emulsion 1 Coating Solution Gelatin 50 parts by weight Silver Bromide (Average particle size, approximately 0.06 μm)] as2T
0.25 parts by weight of 4-methyl-2,3-diethoxathiazololupocyanine iodide is added to 1400 parts by volume of a silver bromide emulsion containing J4u parts to prepare an emulsion that can be optically sensitized at 510 to 530 m[mu].

The emulsion coating solution is applied onto the latex protective layer to a dry layer thickness of 1 μm and dried.

This coated layer was pattern-exposed and developed at 24°C for 5 minutes with a developer containing hydroquinone, sodium nitrite, and sodium carbonate as main components.
A silver image pattern is formed by fixing for 1 minute at 24°C with a fixing solution containing sodium nitrite and glacial acetic acid as main components!・A tracking guide layer was provided by forming a tracking guide.

Next, an ultraviolet curable resin protective layer was provided on the tracking guide layer in the same manner as in Example 1.

In this way, an information recording medium consisting of a substrate, a recording layer, a latex protective layer, a tracking guide layer, and an ultraviolet curable resin protective layer was manufactured.

[Evaluation of Information Recording Medium] 1) Adhesion For each information recording medium obtained, the adhesion between each layer was determined by a cellophane tape peel test to determine the 3f value.

2) Condition of Dye Recording Layer It was observed what kind of changes occurred in the dye recording layer when a protective layer etc. were applied thereon.

The above results are shown in Table 1.

First surface adhesion Dye recording layer condition Example 1 Good No change due to no attack by the top coat Comparative example 1 Good No change due to attack by the top coat Comparative example 2
Poor Not affected by the topcoat and no change Example 2 Good
No change caused by overcoating.As is clear from Table 1, the protective layer made of the polymer latex of the present invention has good adhesion to the dye layer and can protect the dye layer without damaging it. Furthermore, it can be seen that this protective layer also functions as an adhesive layer that connects the various functional layers provided in the protective layer-L and the dye layer provided in the protective layer-L.

On the other hand, when the protective layer is made of the ordinary solvent-soluble resin of Comparative Example 1, the coating of the solvent-soluble resin corrodes the dye layer, so that it cannot serve as a protective layer. Also, comparative example 2
When a water-soluble resin is used, the adhesiveness is low and it is not suitable as a protective layer.

Claims (1)

[Claims] 1. Information is written on the board using a laser and/or
Alternatively, an information recording medium comprising a readable dye recording layer and a protective layer made of polymer latex provided on the dye recording layer. 2. Claim 1, wherein the polymer latex is at least one type of latex selected from the group consisting of styrene-butadiene latex, acrylic latex, vinylidene chloride latex, and vinyl acetate latex. Information recording medium. 3. The recording layer contains cyanine dyes, phthalocyanine dyes, pyrylium, thiopyrylium dyes, squarylium dyes, azulenium dyes, indophenol dyes, indoaniline dyes, triphenylmethane dyes, quinone dyes, aminium, diimmonium. 2. The information recording medium according to claim 1, which contains at least one type of dye selected from the group consisting of complex dyes and metal complex dyes. 4. Information is written on the board using a laser and/or
Alternatively, an information recording medium is provided with a readable dye recording layer, a protective layer made of polymer latex is provided on the dye recording layer, and a functional layer is further provided on the protective layer. 5. Information recording according to claim 4, wherein the functional layer is at least one layer selected from the group consisting of a protective layer made of an ultraviolet curable resin or an inorganic material, a tracking guide layer, and a reflective layer. Medium. 6. Claim 4, wherein the polymer latex is at least one type of latex selected from the group consisting of styrene-butadiene latex, acrylic latex, vinylidene chloride latex, and vinyl acetate latex. Information recording medium. 7. The recording layer contains cyanine dyes, phthalocyanine dyes, pyrylium, thiopyrylium dyes, squarylium dyes, azulenium dyes, indophenol dyes, indoaniline dyes, triphenylmethane dyes, quinone dyes, aminium, diimmonium. 5. The information recording medium according to claim 4, which contains at least one type of dye selected from the group consisting of complex dyes and metal complex dyes.