JPS62222448A - Information recording medium - Google Patents

Abstract

PURPOSE:To obtain an information recording medium having high recording sensitivity by incorporating a specific metal into the recording layer contg. In and metallic compd. of at least one kind selected from a metallic sulfide, metallic fluoride and metallic oxide and providing a prescribed intermediate layer between a substrate and the recording layer. CONSTITUTION:A coating liquid prepd. by dissolving an org. high-polymer material and/or org. low-polymer material into a solvent is coated on the substrate consisting of a polymethyl methacrylate resin, glass, etc. A nitrocellulose, polymethyl methacrylate, etc., and fluorine atom-contg. graft polymer and copolymer, etc., are used for the org. high-polymer material. A higher aliphat. carboxylic acid and esters, and others are used for the org. low-polymer material. The In, at least one kind selected from the metallic sulfide (for example, GeS), metallic fluoride and metallic oxide and metal (Ag, Au, Co, etc.) having 600dyne/cm surface tension within the range of the m.p. and the temp. higher by >=300 deg.C than the m.p. are incorporated into the intermediate layer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an information recording medium in which information can be recorded and/or read using a high energy density laser beam.

[Technical Background of IJ Generation 4; ξ] In recent years, information recording media using high energy density beams such as laser light have been developed and put into practical use. This information recording medium is called an optical disk, and includes video disks, audio disks, and even large-capacity static IFs.
It can be used for image files and as disk memory for large-capacity computers.

The basic structure of an optical disk is a disc-shaped transparent substrate made of plastic and a glass cap, and a Bi
, Sn, ■n, Te7, or a recording layer made of metal. Note that the surface of the substrate on which the recording layer is provided is usually coated with an undercoat layer made of a polymeric material in order to increase the f-plane property of the substrate by +3μ, improve the adhesion with the recording layer, or improve the sensitivity of the optical disc. Or an intermediate layer is provided.

Information can be stored on optical discs using laser beams, for example! The irradiated part of the recording layer absorbs the light and raises the temperature locally, causing a physical or chemical change and changing its optical properties, thereby changing the information. recorded. Information is also read from an optical disk by irradiating the optical disk with a laser beam, and information is generated by detecting reflected or transmitted light corresponding to changes in the optical characteristics of the recording layer.

Recently, as a disk structure for protecting the recording layer, at least one of the two disc-shaped substrates is
An air sandwich in which a recording layer is provided on a ζ plate, and these two substrates are joined via a ring-shaped inner spacer and a ring-shaped outer spacer so that the recording layer is located inside and a space is formed. structure has been proposed. In optical discs with such a structure, the recording layer is not in direct contact with the outside air, and information is recorded and reproduced using laser light that passes through the substrate. Therefore, the recording layer is generally not physically or chemically damaged. There will be no interference with the recording or reproduction of information due to dust or dirt adhering to its surface.

As mentioned above, information recording media are very useful in various fields, but it is desired that their sensitivity be as high as possible.

Conventionally, in order to improve the recording sensitivity [1], as a recording layer of an information recording medium, a metallic f=M layer and a non-metallic thin layer made of a PbO2 metal fluoride or an In-Ge-3 based lucogen compound have been used. Amount of seedlings (Special Publication No. 59-34519)
, a layer consisting of a mixture of metal and GeS (Special Publication No. 5B-3
3120) or a metal, a metal fluoride such as MgF2, and M.

A layer consisting of a mixture of O□kasa and metal oxide (Special Publication Publication No. 58
-15319) and the like are known.

However, in such a recording layer, bits may not be sufficiently formed on the recording layer even if laser light is irradiated during recording of information. This is because, although the output of the laser beam itself is sufficient to melt the recording layer, the bit is assimilated into the melted recording layer material at the open position. That is, the sensitivity of the recording medium could not be said to be satisfactory, and it was necessary to increase the output of the laser beam.

In order to solve such problems and increase the sensitivity of information recording media, the applicant has already developed a recording layer or an I.
n and at least one metal compound selected from metal sulfides, metal fluorides, and metal oxides, and further has a surface tension of 600 dyn/ell or less in the FA degree range from the melting point to the melting point +300°C. A patent application has already been filed for a recording medium containing a metal, and a recording medium in which the metal-containing silicon layer has a higher purulent density in the portion of the recording layer closest to the support than in other portions (Japanese Patent Application No. 1983).
-114733-). According to this recording medium, the sensitivity of the information recording medium can be increased by 1-''h compared to conventional recording media.

[Summary of the Invention] The main purpose of the present invention is to provide an information recording medium with high recording sensitivity.

The purpose of the following is to transmit information by laser to the substrate 11:
An information recording medium provided with a recording layer that can be written and/or read, the recording layer containing In and at least one metal compound selected from metal sulfides, metal fluorides, and metal oxides. , the recording layer is further heated at 600° C. within the range of the melting point and a temperature 300° C. higher than the melting point.
Contains a metal that has a surface tension greater than dyn/c+*, and, k,! (This can be achieved by an undeveloped IJ information recording medium characterized in that an intermediate layer made of an organic polymer material and/or an organic low molecular material is interposed between the plate and the recording layer. can.

In the information recording medium of the present invention, a recording layer containing a metal having a specific surface tension is not directly provided on the substrate-L, but is provided through an intermediate layer made of an organic polymer material and/or an organic low molecular material. By providing this, a significant improvement in WJ of the sensitivity of the recording medium can be realized.

That is, a recording layer basically containing In and at least one metal compound selected from metal sulfides, metal fluorides, and metal oxides is further coated with a surface tension of 600° C. within the range of the melting point and a temperature 300° C. higher than the melting point. By containing a metal having a dyn/c or more, good bits can be easily formed in the recording layer due to the high surface tension of this metal.

As a result, the sensitivity of the information recording medium can be significantly increased compared to the conventional method.

In particular, as the material for the intermediate layer, an organic polymer material with a thermal decomposition temperature of 300°C or less and/or a surface energy of 40°C or less is used.
When using an organic polymer material or an organic low molecular material of dyn/cm' or less, the combination between the high surface tension of the metal and the pressure of the steam generated by thermal decomposition of the intermediate layer or the heat insulation properties of the intermediate layer. Due to the synergistic effect, bits can be easily formed in the recording layer, and the sensitivity of the information recording medium can be significantly increased.

[Structure 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 of the substrate, flatness, curability,
In terms of ease of handling, stability over time, and manufacturing cost,
Examples of substrate materials include glass for soda-lime glass shades; acrylic resins such as Selgeast polymethyl methacrylate and injection molded polymethyl methacrylate; JiI bivinyl resins such as polyvinyl chloride and vinyl chloride copolymers; poxy resins and polycarbonates. I can list the following. Among these, from the viewpoint of dimensional stability, transparency and flatness, polymethyl methacrylate,
polycarbonate, epoxy resin and glass,
Particularly preferred is polycarbonate.

The surface of the substrate on which the recording layer is provided has improved flatness,
An undercoat layer may be provided in the direction of adhesive strength and for the purpose of preventing deterioration of the recording layer. - Examples of materials for the coating layer include polymethyl methacrylate, acrylic acid,
Polymeric substances such as methacrylic acid copolymers, nitrocellulose, polyethylene, polypropylene, and polycarbonate; organic substances such as nitrogen coupling agents; and inorganic oxides (Si02, Ami 201, etc.), inorganic fluorides (MgF
Inorganic substances such as 2) can be mentioned.

In the case of a glass substrate, (in order to prevent adverse effects on the recording layer due to alkali metal ions and alkaline earth metal ions liberated from the plate, wood-philic groups such as styrene/maleic anhydride conjugate resistant combinations Preferably, a coating layer made of a polymer having/or a maleic anhydride group is provided.

The undercoat layer is formed by, for example, dissolving or dispersing the substance listed in [2] in a suitable solvent, and then applying this coating solution to the substrate surface using a coating method such as a spin code, dye coat, extrusion coat, etc. I can do that.

Alternatively, a pregroove layer may be provided on the substrate (or undercoat layer) for the purpose of forming tracking grooves or unevenness representing information such as address signals.As the material of the pregroove layer, acrylic acid It is also possible to use a mixture of at least one type of monoester, diester, triester, and tetraester (or oligomer) and a photopolymerization initiator.

The formation of the pre-groove layer begins with a precisely made +1'+
After coating the U mixture consisting of the acrylic ester and polymerization initiator described in 1- on the (stanbar), and further placing the substrate in this coating liquid layer-1-, The liquid layer is cured by irradiation with ultraviolet rays, and the substrate and liquid phase are brought together. Next, No. 1 (by peeling the plate from the matrix, a substrate provided with a pregroove layer is obtained. The thickness of the pregroove layer is generally 0.05 to 100
within the range of JLm, preferably 0.1 to 50 lm
is within the range of Furthermore, if the substrate material is plastic, the pre-croup may be provided directly on the substrate by injection molding, extrusion molding, or the like.

Next, the nol board (or undercoat layer or pre-groove layer)
If a break loop is provided directly on the L or norl plate, an intermediate layer, which is a characteristic feature of the present invention, is provided on the pregroove.

The material for the intermediate layer used in Kibatsu II can be arbitrarily selected from organic polymer materials and organic low molecular materials known as intermediate layer materials for information recording media. Preferred are polymeric materials having a thermal decomposition temperature of 300'C or less, polymeric materials and low molecular weight materials having a surface energy of 40 dyn/cih2 or higher.

Examples of polymeric materials with a thermal decomposition temperature of 300°C or less include:
Ionomer resin, Ibsan resin, Acrylonitrile
Acrylic acid/styrene resin, acrylonitrile/butadiene/styrene resin, ethylene/vinyl chloride resin, ethylene/vinyl acetate/vinyl chloride graft resin, ethylene/vinyl acetate resin 2ethylene/tetrachloroethylene resin, epoxy resin, vinylidene chloride resin, vinyl chloride resin , chlorinated polyether resin, f11 vinyl propylene resin, cylene resin, chroman resin, guanamine resin, ketone resin, vinyl acetate resin, silicone resin,
Diaryl phthalate resin, styrene/formalin resin 1
Right oil resin, polyethylene, vinyl ester resin, phenoxy resin, phenol resin, vinylidene fluoride resin, fluororesin, furan resin, butyral resin, unsaturated polyester resin.

Polyacetal resin, polyamide resin, polyimide 1~resin, polyisobutylene, polyurethane resin, polyethylene oxide, polycarbonate resin, polyurethane resin, polysulfide polymer, polystyrene resin, ethylene derivative resin, polysulfone resin, polyterpene resin, polyvinyl alcohol, polyvinyl ether, polyvinyl carbazole , polyvinyltoluene, polyvinyl formal, polyphenylene oxide, polypropylene resin, polybutylene terephthalate resin, polybutene, acrylic resin, methacrylic resin, melamine resin, urea resin, resorcinol resin, ethyl cellulose, acetyl cellulose, carboxymethyl cellulose, nitrocellulose, hydroxyethyl cellulose, methyl cellulose , styrene-butadiene rubber, polybutadiene rubber, polyisoprene rubber, acrylonitrile-butadiene rubber, and chloroprene rubber. Among these, preferred are nitrocellulose, polymethyl methacrylate, polystyrene, polystyrene copolymer, polyvinyl chloride and polyvinyl acetate.

Examples of polymeric materials having a surface energy of 40 dyn/c2 or less include graft polymers containing fluorine atoms and/or silicon atoms, and heptanomeroplasmic polymers containing silicon atoms.

弗>+: The atom- and/or silicon-atom-containing graft polymer is a backbone polymer consisting of, for example, polyalkyl (meth)acrylate, polybutadiene, ethylene/vinyl acetate copolymer, etc.
It is composed of a branch polymer made of acrylate, polyacrylonitrile, polystyrene, etc., and fluorine and/or silicon may be contained in either the trunk polymer or the branch polymer. The molecular weight of this graft polymer is generally in the range of 1.1100 to too, ooo.

This graft polymer exhibits +i) solubility in organic solvents.

For details on the fluorine atom and/or silicon atom-containing graft polymer used as the intermediate layer material, see
It is described in the specification of Japanese Patent Application No. 60-222573 filed by the present applicant.

Examples of low-molecular materials with a surface energy of 40 dyn/am 2 or less include higher aliphatic carboxylic acids having a surface energy of 11 to 21, their esters, amides, and metal salts. : and aromatic or aliphatic esters of phosphoric acid having carbon numbers ranging from 11 to 21, S (
Mention may be made of aliphatic alcohols and higher aliphatic incyanates of II and yellow gold compounds represented by CH2CH2C00R) 2 (wherein R is an alkyl group or a phenyl group). Among these, preferred are higher aliphatic carboxylic acids having a carbon number of 11 to 21, and their esters, amides, and metal salts: and aromatic phosphoric acids having a carbon number of 11 to 21. or aliphatic esters.

The organic polymer materials and organic low molecular materials listed in -h may be used alone or as a mixture.

The intermediate layer can be formed by dissolving the organic polymer material and/or organic low molecular material in a solvent to prepare a coating solution, and then applying the coating solution onto the substrate.

Solvents for dissolving the organic polymer materials and organic low molecular materials listed in L include methanol 1 ethanol, propatool, butanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, diacetone alcohol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, methyl cello. Mention may be made of solf acetate, ethyl cellosolve acetate, dimethylformamide, thinner toluene, xylene, ethyl acetate, butyl acetate, 1,2-dichloroethane, cyclohexanone, cyclohexane, tetrahydrofuran, ethyl ether, dioxane, and the like.

It is also possible to add various additives such as IIF plasticizers and lubricants to these coating/Ij liquids depending on the purpose.

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

(The intermediate layer can be formed on the substrate (or undercoat layer) by coating it on the board surface (or undercoat layer) to form a coating film and then drying it. The thickness of the intermediate layer is , 50
It is preferably within the range of 10,000 to 10,000, particularly preferably 50 to 1,000.

Next, a recording layer is provided on the intermediate layer.

The materials for the recording layer basically include In and at least one metal compound selected from metal sulfides, metal fluorides, and metal oxides, as well as one material having a melting point of 300°C below the melting point, which is a characteristic requirement of the present invention. Within the range of high temperatures, the surface tension is 6.
Metals with a resistance of less than 0.00 dyn/cm may be used.

Examples of metal sulfides include CrS, Cr25, Cr252,
MoS2, MnS, FeS, FeS2. CoS, Co2
53, NiS, N12S, PbS, Cu2S, Ag2S
, ZnS, In2S3. In52, Ge5z (0,5
<X≦2゜0), SnS, 5nS2. As2S3.5b
2S3 and Bi25. I can list many things. As metal fluorides, MgF2, CaF2 and RhF,
I can list things like C.

As metal oxides, MoO2, In2O, In2O3
, GeO and pbo.

Examples of metals that have a surface tension of 600 dyn/cm or more within the range of the melting point and 300°C above the melting point include Ag, AI, Co, Cu, Ga, Mo, N.
i, Si, V, Au, Be, Cr, Fe, Mn, Nb,
Mention may be made of Pd, Ti and Zn.

Preferably, the metal with high surface tension is Au, and Au
, In and GeS.

The In content in the recording layer is generally 30 to 80 tons. The content of metal compounds such as metal sulfides, metal fluorides and metal oxides is generally within the range of 10 to 50 tons (11%).
, preferably within the range of 20 to 40% by weight. In addition, the content of metals with high surface tension is generally 0.1 to 3.
0 tons ij%, preferably within the range of 1 to 15 weight H,H%.

In the present invention, the metal having a high surface tension is preferably contained in the recording layer so that the concentration on the plate side is higher than the concentration on the recording layer surface side on the opposite side.

-1. It is desirable that the concentration of the metal having high surface tension is within the range of 10 to 75% by weight on the substrate side surface of the recording layer.

Note that the concentration of the metal with high surface tension in the 1z recording layer is present at a cut surface when the recording layer is turned in the plane direction in f rows and cut at the thickness. It refers to the ratio (weight ratio) of the metals.

Further, the recording layer surface side refers to the surface of the recording layer on the side that is not in contact with the substrate.

For details such as the concentration gradient in the recording layer of the metal with high surface tension, please refer to the patent application filed in 1986 by the present applicant.
No. 114733 and Japanese Patent Application No. 121, February 1988].

The recording layer is formed of the above-mentioned material on the substrate by a method such as vapor deposition, sputtering, or ion plating. In order to increase the concentration of a metal with a high surface tension on the substrate side, for example, during the evaporation process, the heating current flowing through the evaporation source of the metal with a high surface tension can be controlled to reduce the amount of the metal being deposited. This can be done by changing it.

The recording layer may be a single layer or a multilayer, but its layer thickness is generally SOO~15 from the viewpoint of optical density required for optical information recording.
It is in the range of 00 or more.

The presence of metals with high surface tension in the recording layer in addition to In and metal compounds such as metal sulfides, metal fluorides, and metal oxides causes the formation of bits when recording information with laser light. become more susceptible to Therefore, the output of laser light can be reduced,
It is possible to increase the recording sensitivity. Further, since it is possible to form a pill with a good shape, it is also possible to reduce reading errors when reading information.

Furthermore, the present invention is characterized in that the recording layer is provided on the substrate via an intermediate layer, so that thermal energy caused by laser beam irradiation is not lost due to thermal conduction from the recording layer to the substrate, etc. In addition, gas is generally generated from the irradiated portion of the intermediate layer, making it easier to form a focus point, thereby significantly improving the recording sensitivity of the recording layer.

Note that the surface of the substrate opposite to the side on which the recording layer is provided is coated with an inorganic substance such as silicon dioxide, tin oxide, or magnesium fluoride in order to improve scratch resistance and moisture resistance.
A thin film made of a polymeric material such as a thermoplastic resin or a photocurable resin may be provided by a method such as vacuum deposition, sputtering, or coating.

In this way, it is possible to manufacture an information recording medium having a basic structure in which the substrate, intermediate layer, and recording layer are laminated in this order.

Note that a bonded type recording medium can be manufactured by bonding two substrates having the above structure using an adhesive or the like.

In addition, an air sandwich type recording medium is manufactured by joining at least one of two disc-shaped substrates having the configuration shown in L through a ring-shaped outer spacer and an inner spacer. I can do something.

Next, Examples and Comparative Examples of the present invention will be described.

However, the following items do not limit the present invention to v1.

[Example 1] Disc-shaped polycarbonate substrate with groups formed by injection molding (outer diameter: 130 mm, inner diameter = 15 mm, thickness:
1.2 mm, track pitch 1.6 μm) Coating 4j solution of Group 1 & (I) below was applied by spin code method to the group surface, and then dried to form an intermediate layer with a dry film thickness of 0.02 gm. .

Painting liquid composition (I) C city 2. :1 part) Polystyrene
0.2 part 1 ~ Ruen
10 parts cyclohexane
100 copies Then, In, Au and GeS were added to this intermediate layer at T, , ll ratios of 65% and 5%, respectively.
and 30% of 111 joints, and the thickness is 3
A recording layer of 00X was formed. At this time, the heating current flowing through the Au evaporation source was controlled so that the Au concentration was high on the substrate side and decreased as it approached the surface of the recording layer.

In this way, 11ri! (An information recording medium consisting of a plate, an intermediate layer, and a recording layer was manufactured.

[Comparative Example 1] In, Au and In, Au and G
A recording layer made of eS was formed.

In this way, an information recording medium consisting of a substrate and a recording layer was manufactured in this order.

Evaluation of Information Recording Medium 1 Each of the obtained information recording media was evaluated by the sensitivity test described below.

While rotating the information recording medium at a rotation speed of 515 rpm,
When information is recorded by providing bits in the recording layer using a conductor laser (wavelength: 820 nm) at 1.25 MHz and a duty ratio of 1:1, it is possible to form pits. The minimum laser output intensity was measured.

The results obtained are summarized in Table 1.

Table 1 Example 1 Comparative Example 1 Sensitivity (m W ) 6 8 As is clear from the results shown in Table 1, the intermediate layer made of polystyrene was placed on the right side, and the recording layer contained Au on the substrate side. Information recording medium of undeveloped IJI containing a gradient of degree (Example 1)
) showed high recording sensitivity. - The recording sensitivity of the information recording medium without an intermediate layer for comparison (Comparative Example 1) was low.

[Example 2] In Example 1, the coating liquid composition (1
I
A recording layer made of n, Au, and GeS was formed.

Coating liquid composition (■) (TunjlE ?8) Polystyrene
0.2 parts fluorine-based graft polymer 0.005fi (trade name: GF-300, Toagosei Chemical Industry H5A) 10 parts methyl ethyl ketone 100 parts cyclohexane In this way,
An information recording medium consisting of a plate, an intermediate layer, and a recording layer was manufactured in this order.

[Comparative Example 2] In Example 2, a recording layer made of In and GeS (I
H1 containing n: 52.5 weight ji'L%) was formed with a layer thickness of 300X.

In this way, an information recording medium consisting of a Ti plate, an intermediate layer, and a recording layer was manufactured in this order.

[Evaluation of Information Recording Medium] Each of the information recording media tested was evaluated to have a 1;f rating by performing the sensitivity test described above.

The obtained results are summarized in Table 2.

Table 2 Example 2 Comparative Example 2 Sensitivity (m W ) 6 B As is clear from the results shown in Table 2, the intermediate layer was placed on the right and Au was placed in the recording layer with a high e degree gradient on the substrate side. The information recording medium containing unreleased Ill (Example 2) had high recording sensitivity. on the other hand.

A known information recording medium containing no Au in the recording layer (Comparative Example 2) had low recording sensitivity.

[Example 3] In Example 1, Coating 41 liquid composition (1
) A recording layer made of In, Au and GeS was formed by carrying out the same operation as in Example 1, except that the coating solution (III) was used instead of the coating solution (III).

Coating solution set ffl (m) (weight 1-11 parts) Polymethyl methacrylate 0.2M fluorine-based graft polymer 0.005 parts (Product name: GF-300, East IIF Synthetic Chemical [Gyo W-kei) Methyl ethyl ketone ioo part Like this An information recording medium consisting of a substrate, an intermediate layer, and a recording layer was manufactured in this order.

[Comparative Example 3] In Example 3, a group A recording layer (I
Content of n: 52.

5% hair) was formed with a layer thickness of 300X.

In this way, an information recording medium consisting of a plate and a recording layer was manufactured in this order.

[Jōf&! Evaluation of Recording Medium] Each of the obtained information recording media was evaluated by conducting the sensitivity test described above.

The results obtained are summarized in Table 3.

Table 3 Example 3 Comparative Example 3 Sensitivity (m W ) 6 B As is clear from the results shown in Table 3, the intermediate layer was placed on the right and Au was placed in the recording layer with a high C degree gradient on the substrate side. The information recording medium of the present invention (Example 3) containing the above had high recording sensitivity. ~direction.

A known information recording medium (Comparative Example 3) that did not have an intermediate layer and did not contain Au in the recording layer had low recording sensitivity.

Claims (1)

[Claims] 1. Information is written on the board using a laser and/or
Or, in an information recording medium provided with a readable recording layer containing In and at least one metal compound selected from metal sulfide, metal fluoride, and metal oxide. The layer further contains a metal having a surface tension of 600 dyn/cm or more within a temperature range of 300° C. higher than the melting point, and an organic polymer material and/or organic low molecular material is provided between the substrate and the recording layer. An information recording medium characterized by being provided with an intermediate layer consisting of. 2. The above metal is Ag, Al, Co, Cu, Ga, Mo
, Ni, Si, V, Au, Be, Cr, Fe, Mn, N
2. The information recording medium according to claim 1, wherein the information recording medium is at least one metal selected from the group consisting of B, Pd, Ti, and Zn. 3. 2. The information recording medium according to claim 1, wherein the concentration of the metal on the substrate side is higher than the concentration on the surface side of the recording layer. 4. 2. The information recording medium according to claim 1, wherein the recording layer is made of a mixture of In, GeS, and Au. 5. Information according to claim 1, characterized in that the organic polymer material is a polymer material having a thermal decomposition temperature of 300°C or less or a polymer material having a surface energy of 40 dyn/cm^2 or less. recoding media. 6. 2. The information recording medium according to claim 1, wherein the organic low-molecular material is a low-molecular material having a surface energy of 40 dyn/cm^2 or less. 7. The organic polymer material may be nitrocellulose, polymethyl methacrylate, polystyrene, polystyrene copolymer, polyvinyl chloride, polyvinyl acetate, a graft polymer containing fluorine atoms and/or silicon atoms, and plasma of a monomer containing fluorine atoms or silicon atoms. 6. The information recording medium according to claim 5, which is made of at least one kind of polymer material selected from the group consisting of polymers. 8. The organic low molecular material is a higher aliphatic carboxylic acid having a carbon number within the range of 11 to 21 and esters thereof;
The claimed invention is characterized in that it is at least one low-molecular material selected from the group consisting of amides, metal salts; and aromatic or aliphatic esters of phosphoric acid having a carbon number within the range of 11 to 21. Information recording medium according to scope item 6.