JPH11296913A - Optical information medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a medium which enables good writing or printing without bleeding of ink by forming an ink accepting layer containing a cationic dye fixing agent in a UV-curing resin on the opposite face to the face where a reproducing light enters. SOLUTION: This medium consists of a transparent substrate 1 of a polycarbonate resin or the like having spiral trucking guide grooves, on which a recording layer 2 comprising dyes or the like, a reflection layer 3 of metals such as gold, silver and aluminum, a protective layer 4 comprising a UV-curing resin or the like, and a printing face color layer 5, and further an ink accepting layer 6 are formed. The ink accepting layer 6 is formed by compounding a cationic dye fixing agent such as benzalconium chloride in a hydrophilic resin such as a copolymer of polyvinylpyrrolidone and acrylic acid and mixing the resin with a UV-curing resin, and then applying the mixture on the printing face color layer 5. Thereby, when an ink is deposited and absorbed by the ink accepting layer 6, ionic reaction is caused to change the layer into an insoluble material, which prevents bleeding of the ink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD, a CD-R,
CD-RW, DVD-R, DVD-RW, DVD-RO
More particularly, the present invention relates to an optical information medium having an ink receiving layer for writing or printing characters or pictures suitable for the content of recorded information.

[0002]

2. Description of the Related Art Optical information media such as CDs and CD-Rs include:
2. Description of the Related Art There is known an ink jet recording apparatus in which an ink receiving layer for writing or printing a character or a picture suitable for the content of recorded information is provided on a surface opposite to a surface on which reproduction light is incident. For example, JP-A-6-60432 discloses an optical information medium having an ink receiving layer formed by applying and drying a hydrophilic resin solution. JP-A-7-44888 discloses an optical information medium having an ink receiving layer formed by curing a polymerizable resin containing a hydrophilic monomer. Further, Japanese Unexamined Patent Publication No.
Japanese Patent No. 161769 discloses an optical information medium having an ink receiving layer containing a polyvinyl acetal resin and a water-dispersible resin and / or a water-soluble resin. However,
When writing or printing characters or patterns on these ink receiving layers, especially when using aqueous ink, for example, when printing with a jet ink printer, etc., after the ink adheres, it absorbs and absorbs in the process of absorbing and adsorbing. If the printed optical information medium is left under a high humidity, the ink may bleed.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such a problem and provide an optical information having an ink receiving layer capable of performing good writing or printing without causing ink bleeding. To provide a medium.
Another object of the present invention is to provide an optical information medium having an ink receiving layer that does not cause ink bleeding even when the printed optical information medium is left under high humidity.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical information medium capable of reproducing optically readable information, wherein an optically curable resin is provided on a surface opposite to a surface on which reproduced light is incident. Is provided with an ink receiving layer containing a cationic dye fixing agent.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION By including a cationic dye fixing agent in an ink receiving layer, an ionic reaction occurs when the ink is deposited on and absorbed by the ink receiving layer, and the ink is converted into an insoluble substance. It is possible to reduce ink bleeding during writing or printing and ink bleeding when left under high humidity. The content of the cationic dye fixing agent in the ink receiving layer is preferably 30% by weight or less of the ink receiving layer, whereby the properties of the ink receiving layer surface can be made flat.

Another object of the present invention is to provide an optical information medium capable of reproducing optically readable information, wherein polyvinylpyrrolidone is contained in an ultraviolet curable resin on a surface opposite to a surface on which reproduced light is incident. This is achieved by an optical information medium provided with an ink receiving layer including at least one of a copolymer of acrylic acid and a copolymer of polyvinylpyrrolidone and vinyl acetate.

When the ink receiving layer contains at least one of a copolymer of polyvinylpyrrolidone and acrylic acid and a copolymer of polyvinylpyrrolidone and vinyl acetate, it is possible to prevent the ink from being absorbed by the ink receiving layer. The absorption speed and the absorption capacity can be dramatically improved, and the bleeding of ink during writing or printing can be reduced.

[0008] The amount of the copolymer of polyvinylpyrrolidone and acrylic acid and the copolymer of polyvinylpyrrolidone and vinyl acetate contained in the ink receiving layer is preferably 70% by weight or less of the ink receiving layer. Thereby, stickiness on the surface of the ink receiving layer can be prevented.

Further, the molecular weight of polyvinylpyrrolidone in the copolymer of polyvinylpyrrolidone and acrylic acid and the copolymer of polyvinylpyrrolidone and vinyl acetate is preferably 500,000 or more, whereby the stickiness on the surface of the ink receiving layer is improved. Can be prevented well.

FIG. 1 is an enlarged sectional view schematically showing an example of the optical information medium of the present invention. The transparent substrate 1 is made of polycarbonate resin or the like and has a spiral tracking guide groove.
A recording layer 2 made of a dye or the like, a reflective layer 3 made of a metal film of gold, silver, aluminum or the like, a protective layer 4 made of an ultraviolet curable resin or the like, and a printed surface coloring layer 5 are formed thereon. The receiving layer 6 is formed.

As the ultraviolet curable resin used for the ink receiving layer in the optical information medium of the present invention, known resins such as acrylates such as ethyl acrylate and ethylene glycol diacrylate and acrylamides such as methylenebisacrylamide and dimethylacrylamide can be used. Can be mentioned.

Examples of the cationic dye fixing agent include, for example, benzalkonium chloride, distearyldimethylammonium chloride, polyamide polyurea resin, polyamine-based water-soluble cationic resin, didecyldimethylammonium chloride and the like.

In order to form the ink receiving layer, for example, a hydrophilic resin such as a copolymer of polyvinylpyrrolidone and acrylic acid, a copolymer of polyvinylpyrrolidone and vinyl acetate, and the like are added to the ultraviolet curable resin. Accordingly, a mixture of silica and a cationic dye fixing agent,
The surface opposite to the surface on which the reproduction light of the optical information medium is incident by a spin coater or screen printing, for example, FIG.
And then dried on the printed surface coloring layer 5.

[0014]

According to the optical information medium of the first aspect, by including a cationic dye fixing agent in the ink receiving layer, an ionic reaction occurs when the ink arrives at the ink receiving layer and is absorbed. Since the ink is changed to an insoluble substance, the bleeding of the ink at the time of writing or printing and the bleeding of the ink when left under high humidity can be reduced. According to the optical information medium of claim 2, the properties of the ink receiving layer surface can be made flat by setting the content of the cationic dye fixing agent in the ink receiving layer to 30% by weight or less. According to the optical information medium of claim 3, since the ink receiving layer contains at least one of a copolymer of polyvinylpyrrolidone and acrylic acid and a copolymer of polyvinylpyrrolidone and vinyl acetate, the ink is used in the ink receiving layer. The absorption speed and absorption capacity at the time of ink absorption can be dramatically improved, and the bleeding of ink at the time of writing or printing can be reduced. According to the optical information medium of claim 4, the content of the copolymer of polyvinylpyrrolidone and acrylic acid and the copolymer of polyvinylpyrrolidone and vinyl acetate in the ink receiving layer is 70% by weight or less. Stickiness on the ink receiving layer surface can be prevented. According to the optical information medium of claim 5, the molecular weight of polyvinylpyrrolidone in the copolymer of polyvinylpyrrolidone and acrylic acid and the copolymer of polyvinylpyrrolidone and vinyl acetate contained in the ink receiving layer is 500,000 or more. Thereby, stickiness on the ink receiving layer surface can be better prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing one example of an optical information medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Recording layer 3 Reflective layer 4 Protective layer 5 Printing surface coloring layer 6 Ink receiving layer

Claims (5)

[Claims] In an optical information medium capable of reproducing optically readable information, an ink receiving layer containing a cationic dye fixing agent in an ultraviolet curable resin is provided on a surface opposite to a surface on which reproduction light is incident. An optical information medium, comprising: 2. The optical information medium according to claim 1, wherein the amount of the cationic dye fixing agent contained in the ink receiving layer is 30% by weight or less of the ink receiving layer. 3. In an optical information medium capable of reproducing optically readable information, a copolymer of polyvinylpyrrolidone and acrylic acid in an ultraviolet curable resin is provided on a surface opposite to a surface on which reproduction light is incident. And an ink receiving layer containing at least one of a copolymer of polyvinylpyrrolidone and vinyl acetate. 4. The method according to claim 1, wherein the amount of the copolymer of polyvinylpyrrolidone and acrylic acid and the amount of the copolymer of polyvinylpyrrolidone and vinyl acetate contained in the ink receiving layer are 70% by weight or less of the ink receiving layer. The optical information medium according to claim 3. 5. The copolymer of polyvinylpyrrolidone and acrylic acid and the copolymer of polyvinylpyrrolidone and vinyl acetate, wherein the molecular weight of polyvinylpyrrolidone is 500,000 or more.
The optical information medium according to the above.