JP2001006227A - Material for correction of label face for optical recording medium and method for correction of label face of optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make correction, change or erase of the record or printed content on the surface of an optical recording medium easy by preparing a laminated body of a foamed film layer and a print accepting layer. SOLUTION: The correcting material for the label face of an optical recording medium is used to correct the record or printed content erroneously performed, to change the record or printed content when the stored information is to be changed, and to erase the record or printed content to renew the stored information. The correcting material for the label face consists of a laminated body having at least a foamed film layer and a print accepting layer, and preferably an adhesive layer or cohesive layer is formed on the surface of the correcting material where the print accepting layer is not formed. Further, a release paper is laminated on the surface of the correcting material where the printing accepting layer is not formed. The structural material of the print accepting layer is properly prepared according to the printing method used. When a thermal transfer method is used, the layer usually consists of a resin having dyeing property and fine particles to be compounded as required into the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label surface correcting material for an optical recording medium and a method for correcting the label surface of an optical recording medium.

[0002]

2. Description of the Related Art Optical recording media are classified into two types: a write-once type, on which information can be recorded and reproduced, and a rewritable type, on which data can be erased after recording. In particular, users of CD-R (write-once type) and CD-RW (rewriteable type) optical information media of the CD system are rapidly increasing. The surface of such an optical recording medium, specifically, the surface opposite to the laser incident surface of the optical recording medium is often written with various writing tools or printed with various printers. In other words, in the case of end users, writing or printing may be performed as an index of information stored in the medium, and in the case of a company that stores data on the medium and sells it to end users, it is called product labeling. Printing may be performed from the viewpoint.

[0003] Writing and printing as described above are performed on the surface of a protective layer constituting the surface of an optical recording medium. In the case of high-definition printing by a thermal transfer method using a thermal head or an ink jet method, This is performed on a print receiving layer specially provided on the surface of the optical recording medium. Hereinafter, of the surfaces (outermost surfaces) of the optical recording medium, the surface opposite to the surface on which the recording / reproducing light is incident is referred to as a “label surface” (label) surface, and the label surface is a protective layer (also having a print receiving function). And a print-receiving layer provided separately from the protective layer. The correction of the label surface is performed on the label surface on which recording and printing have been performed.

[0004] By the way, as the above-mentioned recording and printing become popular, the label surface is corrected, that is, the recording and printing contents are erroneously corrected, and the recording and printing contents are changed and stored in accordance with the change of the storage information. There is an urgent need for a simple method for erasing records and print contents accompanying renewal of information. In addition to the mere correction of the label surface, there is an increasing demand from users for reducing the damage caused by the shock and heat applied to the optical recording medium during recording and printing on the label surface.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object the purpose of correcting, changing, and erasing recorded or printed contents on the surface of an optical recording medium. It is an object of the present invention to provide a label surface correcting material for a recording medium and a label surface correcting method for an optical recording medium.

[0006]

That is, the first aspect of the present invention is as follows.
The gist of the present invention resides in a label surface modifying material for an optical recording medium, comprising a laminate having at least a foamed film layer and a print receiving layer.

A second aspect of the present invention is directed to a method for correcting a label surface of an optical recording medium, wherein the label-surface modifying material for an optical recording medium is laminated on the label surface of the optical recording medium. Exist.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an optical recording medium to which the present invention is applied will be described. The type of the optical recording medium is not limited at all. For example, (1) a normal optical recording medium in which at least a recording layer, a metal reflective layer, and a protective layer are sequentially laminated on a transparent resin substrate, (2) a transparent resin substrate At least one surface has a low-reflectance metal reflective layer formed along at least a concave-convex pattern surface based on the first recording signal and a high-reflectance metal reflective layer formed along a concave-convex pattern based on the second recording signal. Examples include a two-layer optical recording medium in which metal reflection layers are sequentially laminated.

As the transparent resin substrate, for example, polycarbonate resin, acrylic resin, polystyrene resin, vinyl chloride resin, epoxy resin, polyester resin, amorphous polyolefin and the like are used. In particular, a polycarbonate resin is preferable because of its high light transmittance and low optical anisotropy.

In the case of ordinary optical recording media, the thickness of the recording layer is usually 10 to 5000 nm, and the type thereof is not particularly limited as long as recording is possible by laser irradiation. Any of the recording layers made of a substance may be used. In the recording layer made of an inorganic substance, for example,
Tb / Fe / Co or Dy for recording by photothermal magnetic effect
-A rare earth transition metal alloy such as Fe.Co is used. In addition, chalcogen-based alloys such as Ge.Te and Ge.Sb.Te that change phases may be used. An organic dye is mainly used for the recording layer made of an organic substance. Such organic dyes include macrocyclic azaannulene dyes (phthalocyanine dyes, naphthalocyanine dyes, porphyrin dyes, etc.), polymethine dyes (cyanine dyes, merocyanine dyes, squalilium dyes, etc.), anthraquinone dyes, azurenium dyes, and metal-containing dyes. Examples include azo dyes and metal-containing indoaniline dyes. In particular, metal-containing azo dyes are preferable because of their excellent durability and light resistance.

In the case of a usual optical recording medium, the thickness of the metal reflection layer is usually 50 to 200 nm. And as the material, Au, Ag, Al, etc. are usually mentioned,
The preferred material differs depending on the type of the medium. For example, in the case of a magneto-optical recording medium or a phase-change optical recording medium, an Al alloy is preferable, and in the case of an organic dye-based optical recording medium, Ag or an alloy thereof is preferable. Examples of the additive element used in the Al alloy include Ta, Ti, and the like. Examples of the additive element used in the Ag alloy include Ti, Rh, Cu, Ta, Pd, and N.
i, V, Co, Cr, Si, C, B, Sn, P, Zn,
Sb, Mo and the like are mentioned, and these are usually added to Ag at a ratio of 3 atomic% or less.

The two-layer type optical recording medium is prepared according to a known method.
For example, after forming an uneven pattern surface based on a first recording signal on one surface of a transparent resin substrate, a low-reflectance metal reflective layer is formed on the uneven pattern surface, and an ultraviolet curable resin is formed on the upper surface of the metal reflective layer. Forming a light-transmissive layer made of a material such as the above, forming an uneven pattern surface based on a second recording signal on the upper surface of the light-transmissive layer, and forming a metal reflective layer having a high reflectivity on the uneven pattern surface; It can be obtained by forming a transparent protective layer made of an ultraviolet curable resin or the like on the upper surface of the reflective layer.

However, a so-called laminating method is recommended in which after forming an uneven pattern surface based on a recording signal and a metal reflective layer on one surface of a separate transparent resin substrate in order, and bonding them with a transparent adhesive. In this case, the thickness of the metal reflective layer is usually 5 to 1000 nm, and the thickness of the transparent adhesive layer is usually in the range of 2 to 600 nm. The material of each of the above-mentioned metal reflective layers can be appropriately selected. However, in the case where a laser having a wavelength of 530 nm or less is used for information reproduction to further increase the density, a high reflectivity metal reflective layer is used. Is preferably formed of Ag or an alloy thereof, and the metal reflective layer (semi-transparent layer) having a low reflectance is preferably formed of Au.

In the case of a normal optical recording medium represented by the above (1), recording and reproduction of information are performed by irradiating a laser from the transparent resin substrate side to the reflection layer side. Therefore, recording / printing is performed on the protective layer laminated on the metal reflective layer, and the protective layer becomes a label surface. On the other hand, in the case of a two-layer type optical recording medium represented by the above (2), the recorded information is reproduced by irradiating a laser from the low-reflectance metal reflection layer to the high-reflectance metal reflection layer. It is done by doing. Therefore, the laser non-irradiated surface of the transparent resin substrate (in the case of a two-layer optical recording medium by the bonding method, the surface of the transparent resin substrate on the side of the metal reflective layer having high reflectivity) becomes the label surface, It is preferable to provide a protective layer or a print-receiving layer which becomes a label surface on the surface.

For example, in the case of high-definition printing in which figures, symbols, patterns, and the like are formed in full color by a thermal transfer method using a thermal head or an ink-jet method, a protective layer having a print receiving function (protective layer) is usually used. It is preferred that the print-receiving layer (provided separately above) be a label side.

The type of the above protective layer is not limited at all.
It can be configured in the same manner as a conventionally known protective layer of an optical recording medium, and among them, an ultraviolet (UV) curable resin is preferable. The type of the print receiving layer is not limited at all, and can be configured in the same manner as the print receiving layer of a conventionally known optical recording medium. However, (1) a hydrophilic polymer, a hydrophilic monomer, and water absorption Curable resin composition containing a water-soluble / oil-absorbing organic / inorganic filler (JP-A-7-169100)
Publication), (2) an organic filler and / or an organic filler, a hydrophilic monomer, and a polymer soluble in the hydrophilic monomer, and the polymer is (meth)
UV curable resin compositions which are homopolymers or copolymers formed from one or more monomers selected from the group consisting of alkyl esters of acrylic acid and N-alkyl substituents of (meth) acrylic amide (particularly Kaihei 11
Japanese Patent No. 39715) is preferable.

Next, the label surface modifying material for an optical recording medium according to the present invention will be described. The label surface modifying material according to the present invention is capable of correcting the label surface of the optical recording medium as described above, that is, modifying the recording or printing contents erroneously performed, and changing or storing the recording or printing contents accompanying the change of the storage information. It is used for erasing records and print contents accompanying renewal of information.

The label surface modifying material according to the present invention is characterized in that it comprises a laminate having at least a foam film layer and a print receiving layer. In a preferred embodiment, an adhesive layer or a pressure-sensitive adhesive layer is provided on the surface of the correction material, on which the print receiving layer is not provided, and is peeled off on the surface of the correction material, on which the print receiving layer is not provided. The paper is laminated. An example of a particularly preferred layer configuration includes a release paper / adhesive layer or pressure-sensitive adhesive layer / foam film layer / print receiving layer.

Examples of the foamed film used for the foamed film layer include a foamed polyester film, a foamed polyethylene film, a foamed polypropylene film, a foamed styrene film, and the like. The thickness of the foam film layer is usually 3 to 200 μm. The means for foaming the film is not particularly limited, and may be any of a method using a foaming agent, a method using film stretching, and the like.

The constituent material of the above-mentioned print receiving layer is appropriately prepared depending on the printing method to be employed.
Usually, it is composed of a resin having a dyeing property and fine particles to be added to the resin as required. Examples of the resin having dyeing properties include, for example, a saturated polyester resin, an acrylic resin, a methacrylic resin, a styrene resin, a polycarbonate resin, cellulose acetate, a polyvinyl acetal resin, a polyvinyl phenyl acetal resin, a vinyl chloride resin, and a vinyl chloride / vinyl acetate copolymer. Resin, polyarylate resin, AS resin and the like. Examples of the fine particles include inorganic particles such as silica, calcium carbonate, alumina white, and barium sulfate, and organic particles such as a silicone resin, a urea resin, a benzoguanamine resin, a polystyrene resin, a polymethyl methacrylate resin, and microcapsules. The particle diameter of the fine particles is usually 0.01 to 10 μm, preferably 0.02 to 5 μm. The amount of the fine particles is usually 1 to 50 parts by weight based on 100 parts by weight of the resin. The coating amount of the composition for a print receiving layer is usually 1 to 10 g / m ² .

Examples of the adhesive resin used for the adhesive layer include a thermoplastic cellulose resin, an acrylic resin, a polyester resin, a vinyl chloride-vinyl acetate copolymer resin, and a urethane resin. Among these, thermoplastic cellulose resins and acrylic resins are preferred. Specific examples of the thermoplastic cellulose resin include ethyl cellulose, ethyl hydroxyl ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cellulose acetate propionate, and cellulose acetate butyrate. On the other hand, as the acrylic resin, a polyacrylic ester resin containing a carboxylic acid component as a monomer component is preferable, and specific examples of the carboxylic acid component include:
Acrylic acid, methacrylic acid, maleic acid, itaconic acid,
2-methacryloyloxyethyl succinic acid and the like. The ratio of the unit containing the carboxylic acid component is usually 1 to 30 parts by weight based on 100 parts by weight of the resin. The molecular weight is usually 5,000 to 100,000. The coating amount of the adhesive is usually 1 to 10 g / m ² .

Examples of the pressure-sensitive adhesive (pressure-sensitive adhesive) used in the pressure-sensitive adhesive layer include an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a block copolymer-based pressure-sensitive adhesive, a polyisobutylene-based pressure-sensitive adhesive, and a silicone-based pressure-sensitive adhesive. It is composed of agents.
Usually, such a pressure-sensitive adhesive is constituted as a composition such as an elastomer, a tackifier, a softener (plasticizer), a deterioration inhibitor, a filler, and a crosslinking agent.

As the elastomer, for example, natural rubber, synthetic isoprene rubber, reclaimed rubber, SBR, block copolymer, polyisobutylene, butyl rubber, polyacrylate copolymer, silicone rubber, etc. may be used according to the type of the above-mentioned adhesive. No. As the tackifier, for example, rosin, hydrogenated rosin ester, terpene resin, aromatic modified terpene resin, hydrogenated terpene resin, terpene phenol resin, aliphatic petroleum resin, aromatic petroleum resin, aliphatic oil-based water Additional petroleum resins, cumarone / indene resins, styrene resins, alkylphenol resins, xylene resins, and the like.

Examples of the softener include paraffinic process oil, naphthenic process oil, aromatic process oil, liquid polybutene, liquid polyisobutylene, liquid polyisoprene, dioctyl phthalate, dibutyl phthalate, castor oil, and tall oil. Can be
Examples of the deterioration inhibitor include an aromatic amine derivative, a phenol derivative, and an organic thioacid salt. Examples of the filler include zinc white, titanium white, calcium carbonate, clay, pigment, and carbon black.

As a crosslinking agent, for example, sulfur and a vulcanization aid and a vulcanization accelerator (typically, zinc dibutylthiocarbamate and the like) are used for crosslinking a natural rubber-based pressure-sensitive adhesive. Polyisocyanates are used as a crosslinking agent capable of crosslinking at room temperature to an adhesive made from natural rubber and carboxylic acid copolymerized polyisoprene. Polyalkylphenol resins are used as a crosslinking agent such as butyl rubber and natural rubber which has characteristics of heat resistance and non-staining. Crosslinking agents for pressure-sensitive adhesives made from butadiene rubber, styrene-butadiene rubber and natural rubber include organic peroxides such as benzoyl peroxide and dicumyl peroxide, and non-staining adhesives are obtained. The coating amount of the adhesive is usually 1 to 10 g / m ^2.
It is.

In the label surface modifying material according to the present invention, a release paper is laminated on the surface of the adhesive layer or the pressure-sensitive adhesive layer, and further on the surface of the print receiving layer, if necessary. Such a release paper is obtained by applying a release agent to a substrate. Substrates include glassine paper, condenser paper, tissue paper such as paraffin paper, polyester, polypropylene, cellophane, polycarbonate, cellulose acetate, polyethylene, polyvinyl chloride,
Plastics such as polystyrene, nylon, polyimide, polyvinylidene chloride, and ionomers, and composite base materials of these plastics and paper, and as a release agent,
Examples include a silicone resin-based release agent, a ketone resin-based release agent, and a polyvinyl acetal resin-based release agent.

Each of the above layers is formed by applying a coating liquid. The coating liquid is prepared by dissolving or dispersing components necessary for forming each layer in an appropriate organic solvent. At this time, for example, a homogenizer, a paint conditioner, a sand grind mill and the like can be used.
As a coating apparatus, for example, a reverse roll coater, a gravure coater, a rod coater, an air doctor coater, a die coater, a gravure printing machine, or the like is used, and coating by a gravure printing method is particularly preferable.

The label-surface modifying material for an optical recording medium of the present invention may have an arbitrary layer, if necessary, in addition to the above-described layers. Further, the shape may be any of an elongated tape shape, a wide sheet shape, the same shape as the label surface of an optical recording medium, and may be any of a wound shape or a single-sheet shape. Except in the case of a label surface modifying material having an adhesive layer, it can be used by applying an appropriate pressure without requiring any special means. In the case of a label surface modifying material having an adhesive layer, appropriate heating and pressing means is required.

Next, a method for correcting a label surface of an optical recording medium according to the present invention will be described. The label surface correcting method according to the present invention is characterized in that the label surface correcting material is superimposed on and adhered to the label surface of an optical recording medium. Specifically, the adhesive or pressure-sensitive adhesive layer of the label-surface modifying material cut to a predetermined size and the label surface of the optical recording medium are pressed or heated and pressed.

The method for correcting the label surface of an optical recording medium according to the present invention is applied to a protective layer surface for an optical recording medium having a structure in which a recording layer, a reflective layer and a protective layer are sequentially laminated on a transparent substrate. For an optical recording medium having a structure in which a recording layer, a reflective layer, a protective layer, and a print receiving layer are sequentially laminated on a transparent substrate, the present invention is applied to the print receiving layer surface. Then, color printing can be performed on the newly formed print receiving layer. And
At this time, the damage to the optical recording medium during printing can be reduced by the cushioning function of the foam film of the label surface modifying material according to the present invention.

[0031]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples unless it exceeds the gist.

Example 1 (a) Preparation of coating liquid for print receiving layer: 100 parts by weight of vinyl chloride / vinyl acetate copolymer resin, 25 parts by weight of silicone resin fine particles (average particle size: 2 μm), 200 parts by weight of toluene, methyl ethyl ketone A coating liquid is prepared by mixing 200 parts and 5 parts by weight of an amino-modified silicone as a release agent.

(B) Preparation of label surface modifying material for optical recording medium: First, a coating liquid for a print receiving layer such that a dry coating amount is 3 g / m ^{2 on} one surface of a foamed polyethylene terephthalate film having a thickness of 50 μm. 5 g of acrylic adhesive on the other side of the foamed polyethylene terephthalate film
/ M ² .

(C) Modification of label surface and formation of print receiving layer: Print receiving layer surface (label) of an optical recording medium having a structure in which a recording layer, a reflective layer, a protective layer, and a print receiving layer are sequentially laminated on a transparent substrate. The original print is completely concealed by laminating the label surface modifying material described above on the front side. When full color printing is performed on the newly formed print receiving layer by the sublimation thermal transfer method, printing can be performed without any problem.

[0035]

According to the present invention described above, a label surface modifying material for an optical recording medium and a label for the optical recording medium, which are used for correcting, changing, erasing, and the like the recording and printing of the surface of the optical recording medium. A surface correction method is provided, and the practical value of the present invention is significant.

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Claims (4)

[Claims] 1. A label surface modifying material for an optical recording medium, comprising a laminate having at least a foam film layer and a print receiving layer. 2. The label surface modifying material for an optical recording medium according to claim 1, wherein an adhesive layer or a pressure-sensitive adhesive layer is provided on a surface of the modifying material on which the print receiving layer is not provided. 3. The label surface modifying material for an optical recording medium according to claim 1, wherein a release paper is laminated on a surface of the modifying material on which the print receiving layer is not provided. 4. A method for correcting the label surface of an optical recording medium, wherein the label surface correcting material for an optical recording medium according to claim 1 is superimposed on the label surface of the optical recording medium.