JPH03248344A - Optical information recording carrier - Google Patents

Abstract

PURPOSE:To obtain the optical information recording carrier having the good peelability from a stamper and the adhesiveness to a transparent base consisting of glass or plastic by providing a signal transfer layer consisting of a curable phosphazene resin on the above-mentioned base. CONSTITUTION:The signal transfer layer 2 for transferring the rugged signals of the stamper is applied on the glass or plastic base 1. Namely, a photopolymn. initiator is added at need to the liquid curable phosphazene resin and this liquid is dropped onto the base 1 and thereafter, this base is brought into pressurized contact with the stamper to spread the compd. to a prescribed thickness as well as to transfer the rugged signals of the stamper. The curable phosphazene resin is then irradiated with UV rays or radiations, such as electron beams, from the base 1 side and is thereby cured. The optical information recording carrier having the good peelability from the base and the excellent adhesiveness to the base is obtd. in this way.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an optical information recording carrier (hereinafter referred to as an optical disk substrate) for optically recording, reproducing, erasing, and writing video information, etc. It is.

(Problems with the Prior Art) Conventionally, in the production of optical information recording carriers, injection methods and photopolymerization methods (for example, special Kaisho 55-1603
The 2P method described in Japanese Patent No. 38, etc. is known, and the 2P method has high transfer accuracy and is easy to manufacture, so it is widely used.

The 2P method is a method of curing resin with radiation, such as ultraviolet rays or electron beams, in which a stamper with fine irregularities is superimposed on a radiation-curable resin layer provided on a glass or plastic support and pressure-bonded. However, since the method involves transferring the uneven signal of the stamper onto the resin and curing the resin layer by irradiating the resin layer, the substrate is peeled off from the stamper to obtain an optical information recording carrier. Cheap.

However, there are several problems when transferring stamper signals using ultraviolet curable resin.

That is, if the adhesion between the ultraviolet curable resin and the stamper is too good, it will take time to peel off the stamper, reducing productivity and sometimes damaging the substrate during peeling.

Furthermore, when a stamper is used repeatedly, ultraviolet curable resin gradually accumulates on the stamper surface, shortening the life of the stamper, making it difficult to transfer signals accurately, and causing noise.

Furthermore, if the adhesiveness between the ultraviolet curable resin and the support is insufficient, the signal transfer layer may peel off from the support due to environmental changes during disk use. Therefore, the ultraviolet curable resin must be easily peeled off from the stand bar and must have strong adhesion to the support.

For this reason, several proposals have been made so far as ultraviolet curable resins, such as ethyl acrylate, n
-butyl acrylate, 1.1 isopropylene-bis(
P-phenoxyethyl acrylate), 2-ethylhexyl acrylate, dodecyl acrylate, ethoxyethyl acrylate, amino acrylate, 2-hydroxyethyl acrylate, 1.3-propanediol diacrylate, 1.3-butanediol diacrylate, Trimethylolpropane triacrylate, 2,2
Polymers or oligomers of acrylate monomers such as -bis(4-acryloyloxydiethyleneoxyphenylpropane) and methacrylate monomers are known. However, none of them satisfy quality requirements such as adhesion to the support, releasability from the stand bar, environmental stability, and heat resistance.

(Problems to be solved by the present invention) Therefore, an object of the present invention is to have good releasability from the stand bar,
Another object of the present invention is to provide an optical information recording carrier that has excellent adhesiveness to a support.

(Means for Solving the Problems) The present invention has been made to solve the problems of the prior art described above, and as a result of various studies, it has been found that signal transfer made of a curable phosphazene resin onto a transparent support of glass or plastic. By providing a layer, it improves the peelability from the standbar, extends the life of the standbar, improves productivity, and also improves the adhesion of the signal transfer resin to the support, making it resistant to environmental changes during use. On the other hand, the inventors found that the characteristics of the disk did not change at all, leading to the completion of the present invention.

The curable fusphazene resin as used in the present invention is - formula % formula % (1) (wherein A represents a polymerizable curable group, B represents a non-polymerizable curable group, and 12>O, m≧0, A real number that satisfies z+m=2,
A curable phosphazene resin having a degree of polymerization of 3 or more and having a repeating unit represented by (n represents an integer), and a curable phosphazene resin having a degree of polymerization of 3 or more in which the repeating units represented by formula (I) are cyclically bonded. can give.

In the above formula (I), the polymerizable curable group A includes a functional group having a reactive double bond, such as a functional group containing an acryloyl group, a methacryloyl group, an allyl group, and the like. As a specific example, CO! =CR'C0OR"0- CHz = CR'C0NHR"0- CHz=CR'CO? LH- CHz=CR'CR'R'0- (wherein, R' represents a hydrogen atom or a methyl group, R2 represents a straight or branched alkylene group having 1 to 12 carbon atoms, R3 and R4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms).

In addition, as the non-polymerizable curable group B, - formula (where M is an oxygen atom, a sulfur atom or an imino group, and R5 has a carbon number of 1 to 1
8 alkyl group or halogenated alkyl group having 1 to 18 carbon atoms, R6 to RIG are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, or a halogenated alkyl group having 1 to 18 carbon atoms.
- 4 (representing a halogenated alkyl group).

Specific examples of curable phosphazene resins that can be used in the present invention include (NP (OCHzCH=CHz) zsr
Examples include cyclic compounds such as ('b).

These curable phosphazene resins can be cured by electron beam (EB) curing, UV curing by adding an ultraviolet (UV) curing initiator, and can also be cured by thermosetting methods, and have excellent transparency, heat resistance and Forms a film with extremely high hardness.

As shown in FIG. 1, the optical disc substrate of the present invention has a structure in which a signal transfer layer 2 for transferring Starbuck's uneven signals is coated on a glass or plastic support 1.

The curable phosphazene resin used in the present invention easily undergoes a crosslinking reaction by ultraviolet irradiation, electron beam irradiation, or heating to form a three-dimensional network structure.

In producing the optical disk substrate of the present invention, a photopolymerization initiator is added to the liquid curable phosphazene resin as necessary, and this liquid is dropped onto a transparent support made of glass or plastic (or onto a stamper). Thereafter, this is pressed against a stamper (or a transparent support) to spread the compound to a predetermined thickness and to transfer the unevenness signal of the stamper. Next, the transparent support is irradiated with radiation such as ultraviolet rays or electron beams to harden the curable phosphazene resin, and then peeled off from the stamper to obtain an optical disk substrate.

The curable phosphazene resin can be used alone or optionally mixed with other radiation curable compounds such as acrylic or methacrylic monomers or oligomers.

Another coating method is to dissolve the compound in a ketone organic solvent such as acetone, methyl ethyl ketone, or methyl isobutyl ketone, or an aromatic organic solvent such as benzene, toluene, or xylene (if necessary, add a photopolymerization initiator). The added solution was applied to the support 1 using a spin coater, and then,
A resin layer for uneven signal transfer is formed on the support by evaporating the solvent in a clean oven, and then the signal transfer layer is cured by overlaying it with a stamper and irradiating it with ultraviolet rays or electron beams. It may be peeled off.

As the photopolymerization initiator used in the present invention, known compounds such as phenone, quinone, xanthenone, anthracenone or naphtone compounds such as acetophenone, 2
, 2-jethoxyacetophenone, p-dimethylaminoacetophenone, benzophenone, benzoin isopropyl ether, benzoin-n-butyl ether or benzoin isobutyl ether.

The present invention will be explained below with reference to Examples.

Note that parts in the examples mean parts by weight.

(Example) Example 1 A coating liquid having the following composition was prepared.

This liquid was dropped in a donut shape onto a glass support for optical disks, and this was placed on a nickel stamper with a concavo-convex signal engraved on it, and by pressing the two together, the resin was coated to a thickness of 50 μm.
A signal transfer layer was formed. Next, from the glass support side, ultraviolet rays were irradiated for 5 seconds from a distance of 20 al using a 2 kW high-pressure mercury lamp to harden the resin and transfer the unevenness signal of the stamper to the resin layer. A substrate for an optical disk was obtained.

The obtained optical disk substrate of the present invention was heated at 85°C and 85% R.
When an environmental durability test was carried out after leaving the film for 2,000 hours in H.H., no abnormalities such as peeling, floating, or clouding occurred in the uneven signal transfer layer. Further, a heat cycle of 2 hours at 75°C and 2 hours at -15°C was performed for 20 hours, but there was no change at all.

Furthermore, the adhesion was tested by the substrate test JIS K-540.
When evaluated as 0, the evaluation score was 10, which was extremely excellent.

Example 2 A coating liquid having the following composition was prepared.

This liquid was applied to a glass support for an optical disk in the same manner as in Example 1, layered with a nickel stamper, and cured by irradiation with ultraviolet rays to form a signal transfer layer with a thickness of 50 μm. I got the board.

The obtained optical disk substrate was heated to 85°C in the same manner as in Example 1.
When an environmental durability test was carried out by leaving it at 85% RH for 2000 hours, no abnormalities such as peeling, floating, or clouding occurred in the uneven signal transfer layer. In addition, -1 at 75℃ for 2 hours
A heat cycle of 2 hours at 5° C. was performed for 30 hours, but there was no change at all.

Furthermore, the adhesion was tested according to JIS K 5400.
When evaluated, it was extremely excellent with an evaluation score of 10.

(Comparative example 1) An ultraviolet curable resin solution having the following composition was prepared.

This ultraviolet curable resin solution was applied to a glass support for an optical disk in the same manner as in Example 1, layered with a nickel stump bar, and cured by irradiation with ultraviolet rays to form a signal transfer layer with a thickness of 50 μm. A substrate for an optical disk was obtained. When the obtained substrate was subjected to a base peel test in the same manner as in Example 1, the evaluation score was 2, indicating that the adhesion between the glass support and the ultraviolet curable resin was extremely weak.

(Comparative Example 2) An ultraviolet curable resin solution having the following composition was prepared, and a signal transfer layer was formed in the same manner as in Example 1 to obtain a comparative optical disk substrate.

The obtained optical disk substrate was heated to 85°C in the same manner as in Example 1.
When an environmental durability test was conducted at 85% RH, the signal transfer layer was lifted from the glass support and peeled off after being left for 100 hours.

(Effects of the Invention) The optical information recording carrier provided with the signal transfer layer made of the curable phosphagen resin of the present invention has good peelability from the stamper, so the stamper life and productivity are improved, and the signal transfer layer supports FIG. 1 is a sectional view showing the structure of the optical information recording medium of the present invention.

1...Glass or plastic support 2...Signal transfer layer

Claims (1)

[Claims] An optical information recording carrier characterized in that a signal transfer layer made of a curable phosphazene resin is provided on a transparent support made of glass or plastic.