JPS5998330A - Information recording carrier - Google Patents

Abstract

PURPOSE:To increase the adhesive strength of the plastic substrate of an information recording carrier to a cured lacquer film having signals for information and guide grooves by using a resin contg. a component which bonds chemically to a radiation-curing lacquer layer on the substrate as the material of the substrate. CONSTITUTION:Spacers 4 are placed on a die 1 for transfer, and the die 1 is coated with a radiation-curing lacquer layer 2 contg. ethylene glycol diglycidyl ether, an aromatic diglycidyl compound and a photopolymn. initiator. A cast disklike substrate 3 contg. a copolymer causing cationic polymn. under radiation such as a methyl methacrylateglycidyl methacrylate copolymer or a cationic polymerizable monomer in a uniformly dispersed state is mounted on the layer 2. Radiation 5 such as electron beams is irradiated on the substrate 3 to cure the layer 2 and to chemically bond functional groups in the substrate 3 to functional groups in the layer 2. An information recording carrier faithful to the die 4 and preventing the stripping of the layer 2 from the substrate 3 is obtd.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This article describes information for video discs and digital 1''-dio discs in which a single layer of radiation-curable lacquer is provided on a plastic substrate to form signal pits. Relating to record carriers.

[Technical background of the invention and its problems]

In general, information carriers for video discs and digital audio discs are discs on which a large number of signal bits are formed, and are manufactured by conventional molding methods, compression molding methods, and the like.

However, these methods have drawbacks such as large manufacturing equipment and low transfer accuracy.

In order to improve these points, a transfer method for forming signal pits in a single layer of radiation-curable lacquer was proposed in Japanese Patent Application Laid-Open No. 51-14060.
Publication No. 1, Japanese Patent Application Publication No. 53-11/5105, '! !
flUi4 Sho 54-1:30902, Japanese Patent Publication No. Sho 54
No. 1-14 is disclosed in Japanese Patent Application Laid-open No. 138406, Japanese Patent Application Laid-Open No. 55-4793, and the like.

This method involves applying a thin layer of liquid radiation-curable lacquer on the different surface of a transfer master mold, such as a master disc or a stamper (metal molding mold made by transferring from an IA disc by the electric method). A colorless and transparent Plus Deck board is placed on top of the lacquer layer, the lacquer layer is irradiated with radiation while the lacquer layer is held between the layers, and the lacquer layer is made into 11Φ. The information recording carrier is manufactured by peeling the integrally bonded glass substrate from the transfer matrix.

However, in conventional information storage carriers, monomers and oligomers having unsaturated bonds are generally used as radiation-curable lacquers, particularly low molecular weight mono-, di-, tri- or tetra-acrylic acid esters are suitable monomers, but plastic substrates (Especially poor adhesion to acrylic plates).

Therefore, if the information recording carrier is used for a long time, especially in a high humidity or high temperature environment, there is a problem in that the radiation-cured lacquer layer gradually peels off from the interface with the substrate.

[Purpose of the invention]

An object of the present invention is to provide an information recording carrier that maintains adhesion between the radiation-cured lacquer layer on which signal pits are formed and the substrate even when used for a long period of time in a high-temperature environment, thereby achieving a long service life. With the goal.

[Summary of the invention]

In the present invention, a radiation-curable lacquer for information transfer and a polymer that is chemically bonded by radiation are contained in the resin of the plastic substrate as a conjugate component or in a dispersed state, so that when the radiation-curable lacquer is cured, The present invention provides an information recording carrier in which a plastic substrate and a radiation-cured film are chemically bonded to improve the adhesion between the two.

As the radiation source, alpha rays, gamma rays, xs rays, and ultraviolet rays are used.

From the viewpoint of the transparency of the substrate and the heat resistance 4Q, polymers such as polymethyl methacrylate, polycarbonate, diethylene glycol bisallyl carbonate, etc. are suitable as the main component of the resin for Zodisnack boards. When transferring 1iith13 from the mold using an acupuncture wire as a radiation source, it is necessary to use - as a subcomponent of the resin for the substrate.
C1 Polyvinyl chloride, polyacrylic acid ester, polyacrylonitrile, nylon, polyethylene terephthalate, etc. are suitable, and the method of containing them is C, the form of a block copolymer, F, chemically dissolved, or simply melted. One of two methods is used: mixing and physically containing the components. Suitable radiation-curable lacquers for plastic plates such as this cD include acrylic acid monoesters, diesters, triesters, and the like.

That is, when the above-mentioned radiation-curable lacquer is used on the above-mentioned nigidistic substrate and one layer of the lacquer is cured with a Renko wire in order to transfer information from the mold to the plastic substrate, at the same time, the subcomponents contained in the resin of the plastic substrate and Since the lacquer layer is chemically bonded by a radical reaction, the cured lacquer film with the information transferred adheres closely to the plastic substrate.

Next, a case will be described in which ultraviolet rays are used as a radiation source.

As the main component of the resin for plastic substrates, vinyl polymers such as polymethyl methacrylate, diethylene glycol, and bisacrylic carbonate polymers are preferred from the viewpoint of substrate transparency and heat resistance.

As the subcomponent, it is preferable to chemically contain a vinyl polymer in the form of a block copolymer having a functional group that undergoes cationic polymerization under ultraviolet rays.

Furthermore, a vinyl polymer having a functional group that causes cationic polymerization may be physically contained in a uniformly dispersed state. Examples of such vinyl polymers include glycidyl methacrylate, glycidyl acrylate, and tetrahydrone rufuryl acrylate.

Cationically polymerizable monomers and prepolymers can be used as components of radiation-curable 1L lacquers for such plastic substrates.

As this 7L thing 7-noshi 11, for example, jMj
monomers and prepolymers with epoxy rings, such as 2-ethylhexyl glycidyl ether CBH17
Examples thereof include 0CH2.CH-CH2, ethylene glycol dichloro\1CH3, and the like.

In order to cationically polymerize the lacquer layer with UV radiation, it is necessary to add a small amount of a photoinitiator as an additive. As the photoinitiator, for example, a diazonium salt, aromatic M iodonium salt, aromatic sulfonium salt, etc. of a Lewis acid can be used.

In order to transfer information from the mold, the above plastic substrate and
When one layer of the lacquer is cured by UV irradiation using the above lacquer, at the same time the lacquer layer is cured, the interface between the plastic substrate and the lacquer layer is chemically bonded by cationic polymerization, which improves the adhesion between the two. improves.

[Embodiments of the invention]

Example 1 Methyl methacrylate 8 as a plastic substrate
0% by weight and glycidyl methacrylate 20 AidH
A disk-shaped casting plate was made with a composition ratio of %.

As a radiation-curable lacquer, ethylene glycol is used to apply this lacquer liquid onto a stanbar, which is a mold for information transfer.
The above-mentioned modified acrylic casting plate was placed on top of it, and a high-pressure mercury lamp was used as a radiation source, and the entire surface was uniformly irradiated with ultraviolet rays.

After the lacquer liquid had hardened, the stambar was peeled off to form a mold with a cured lacquer film adhered to the modified acrylic casting board. In this case, the adhesion between the cured lacquer film and the modified L/L acrylic casting substrate is good, and the transfer accuracy of the uneven IH information (bit (, -f) is also excellent/ζ.

Example 2 As a plastic substrate, a tissue-shaped casting plate having a composition ratio of 80% by weight of methyl methacrylate and 10 overlapping parts of glycidyl acrylate was manufactured.

Several 1F9 curable lacquers were prepared by mixing acrylic acid monoester, diester, and triester at an appropriate composition ratio.

Using a box wire, the above casting plate on a plastic substrate, and the above lacquer as a radiation-curable lacquer,
An information recording carrier was produced in the same manner as in Example 1. This 1^
The information record carrier is made of plastic substrate and lacquer. The φ-formed film is chemically bonded with radical bonds at the interface between the two, and the adhesion between the two is excellent. The plastic-snack substrate and the cured film of radiation-curable lacquer are chemically bonded at the interface between the two, which improves the conventional problem of poor adhesion between the two, and the cured film of the lacquer lasts for a long time. It is possible to provide a long-life information recording carrier that does not peel off.

Therefore, when a metal reflective film is provided on the laser-cured layer of the information recording carrier of the present invention, the information recording carrier becomes capable of optically F+Q scanning due to changes in reflectance. Furthermore, the present invention can be used not only to transfer signal bits but also to transfer spicil-shaped guide grooves generally provided in optically writable information HC recording carriers.

[Brief explanation of the drawing]

=';, i 7 is a diagram for explaining one embodiment of the present invention. (1)...Transfer mold, (2)...One layer of radiation-curable lacquer, (3)...Substrate, (4)...Spacer,
(5)...Radiation.

Claims (1)

[Claims] (11) A single layer of lacquer that is cured by radiation is provided on the transfer mold, and then a glass substrate is placed on top of the lacquer.
In the information record@carrier formed by irradiating radiation M, t with one layer of the lacquer sandwiched therein to cure the lacquer L-, and peeling off the cured one layer of the lacquer from the transfer mold, the resin for the substrate is formed. contains a component that chemically bonds with the lacquer by radiation. (2) The substrate resin physically binds the polymer that chemically bonds to the lacquer by radiation. The information recording carrier according to claim 1, wherein the substrate resin chemically contains a monomer as a copolymer component that chemically bonds with the lacquer by radiation. The information recording carrier according to claim 1, characterized in that: (4) ultraviolet rays are used as a radiation source, and the polymer as a subcomponent to be contained has a functional group that can be cationically polymerized by ultraviolet rays; The information recording carrier according to claim 2 or 3, wherein the lacquer is also of a cationic polymerization type.