JPH01119936A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To prevent cracking of protective layers and recording layer by incorporating a mixture composed of 1 or >=2 kinds selected from titanium, silane or aluminum coupling agents at a specific ratio into an adhesive agent for curing an adhesive layer. CONSTITUTION:The adhesive layer 5 is formed at least by curing the adhesive agent having a radical polymerizable photosetting property. The mixture composed of 1 or >=2 kinds selected from the titanium, silane or aluminum coupling agents to be incorporated into the adhesive agent used for sticking may be incorporated into the adhesive agent to be used for sticking at 0.5-15% by weight and may be incorporated therein preferably at 1-10%, more preferably 3-7%. The generation of the cracking in the protective layers 2, 4 and the recording layer 3 is thereby extremely decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical information recording medium that records, reproduces, or erases information using light.

[Conventional technology]

A conventional optical information recording medium is disclosed in Japanese Patent Application Laid-Open No. 2001-01000.

1737, Japanese Patent Application Publication No. 1986-. 113344, Utsukai Showa 60-
85728, Japanese Patent Application Laid-Open No. 1983-80535, etc., it has an air suntoe edge structure,
033, JP 60-182053, JP 81-54
50 and Japanese Patent Application Laid-Open No. 60-5452, etc., a close bonding structure was used. Further, as an adhesive layer, an epoxy adhesive was used as disclosed in Japanese Patent Application Laid-open No. 60-185.235. In addition, as a bonding method, after applying the adhesive by roll coating, spin cord, etc.
Attempts have been made to cure by applying heat and pressure or pressure.

[Problem that the invention seeks to solve]

However, in the conventional technology, an air sandwich structure or a close bonding structure is used, but the air sandwich structure has a weak mechanical strength because it sandwiches an air layer, and the eccentricity and the amount of eccentricity change due to substrate deformation due to changes in temperature and humidity. The amount of runout is large (and the servo is difficult to apply. Also, the recording layer requires a material with strong oxidation resistance or a protective layer to prevent oxidation. A ceramic layer may be considered, but the air sunglass structure has low mechanical strength, making the ceramic layer prone to cracks.

Pressure-sensitive ti! with close bonding structure. 'When adhesives are used, they are not heat resistant, so the recording layer of optical recording media and the
The protective layer and tuf that are prone to cracks in IIIJ
If cracks occur in f, the pit error rate of the optical recording medium will increase, making it unusable. In addition, some epoxy and urethane adhesives use solvents to lower their viscosity and improve workability, but since these types of adhesives contain solvents, they are not suitable for close bonding and are useless. Even if it is a solvent type, the catalyst used as a curing agent tends to oxidize the recording layer.

The present invention is intended to solve these problems, and its purpose is to minimize the occurrence of cracks in the Na retention layer and the recording layer, to prevent the recording layer from oxidizing, and to improve storage and use of optical recording media. The object of the present invention is to provide an optical information recording medium that does not require any special environmental restrictions and has an extremely wide range of applications.

[Means for solving problems]

In the optical information recording medium of the present invention, ts*m develops at least radical polymerizable photocuring properties in the close bonding of optical information recording media in which information is recorded, reproduced, or erased using light. 111 agent is cured, and the illumination agent is characterized by containing 0.5 to 15% by weight of 11I or a mixture of 21 or more selected from titanium, silane, or aluminum coupling agents. .

In the present invention, a mixture of 1 [or 211 or more] selected from silane, titanium, or aluminum coupling agent contained in the adhesive used for bonding may be added to the adhesive used for bonding at a weight ratio of 0.5 to 211 or more. It does not matter if the content is 15%, but preferably 1 to 10%, more preferably 3 to 7%. If the content is less than 0.5%, the effect of adding the coupling agent will be weak and the adhesion will be poor. Since there is no IIJ, it is easy to separate the IIJ, and pitting corrosion (oxidation of the recording layer) occurs more often. On the other hand, if the coupling agent exceeds 15%, the reaction of the coupling agent itself is incomplete, and it oozes out from the hardened tiI adhesive, penetrates through the pinholes in the recording layer, and lifts the recording layer, causing burst errors. Examples of silane, titanium/or aluminum coupling agents that are likely to cause this and that can be used in the present invention include γ-(2-7minoethyl)aminopropyltrimethoxysilane, γ-(aminoethyl)aminopropylmethyldimethoxysilane, γ-methacryloquineprovir F rimethoxysila 7, N-β-(N-
(vinylbenzylaminoethyl)-7-7minopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-mercap F propyltrimethoxysilane 7, methyltrimethoxysila/, methyltriethoxysilane, vinyltriacetoxy Silane, γ-anilinopropyltrimethoxysilane, vinyltrimethoxysilane 7,
γ-ri0 cuprobylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane/, methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, vinyltrichlorosilane, vinyltris(β
methoxyethoxy)silane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, γ-glycidoxypropylmethyljethoxysilane, N-β(aminoethyl)γ-aminopropyltrimethoxysila/
, N-f, nyl-γ-aminopropyltrimethoxysilane, methyldichlorosilane, phenyltrichlorosilane, Schiff, nyldichlorosilane, tetramethoxysilane,
Dimethyldimethoxysilane, phenyltrimethoxylan, diphenyldimethoxysilane, decyltrimethoxysilane, tetraethoxysilane, methyltriethoxysilane, dimethyljethoxysilane, phenyltrimethoxylan, diphenyldimethoxysilane, bistrimethylacetamidetrimethylsilylacetamide,
Bistrimethylsilylurea, jet-butyldimethylchlorosilane, Improvil triisostearoyl titanate, Impropyl tridodecylbenzenesulfonyl titanate, Isopropyl tris(dioctyl pyrophosphate) titanate, Tetraisopropyl bis(dioctyl phosphite) titanate, Tetraoctyl bis(dioctyl pyrophosphate) titanate decylphosphite) titanate, tetra(2,2-diallyloxymethyl-1-butyl)bis(ditridecyl)phosphite titanate, bis(dioctylpyro7-osphate)ethylene titanate, inpropyltrioctanoyltitanate, isopropyldimethacrylisostearoyl Titanate, inpropyl instearoyl diacrylic titanate, isopropyl tri(dioctyl phosphate) titanate, isopropyl tricumylphenyl titanate, inpropyl tri(N-amidoethyl kami/ethyl) titanate, dicumylphenyloxyacetate titanate, diisostearoyl ethylene Examples include titanate, acetalkoxyaluminum diisoprobieate, and the like.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

1 and 2 are basic configuration diagrams of the optical information recording medium of the present invention.

1 in FIG. 1 is a polycarbonate substrate on which spiral tracking grooves are formed at a pitch of 1.6 μm by injection compression molding. On this substrate, 800λ of 5iAlNa (2) was first formed by DC reaction magnetron sputtering using a 5iA1 sintered target, and then N
A recording layer of 800 NdDyFeCo (No. 3) was deposited by DC magnetron/sputtering using a dDyFaCO alloy target, and 800 recording layers of NdDyFeCo (No. 4) were deposited on top of the recording layer No. 4 (5) by DC reaction magnetron sputtering using a 5iA1 alloy target.
800 people deposited iAINFJ. This was then bonded to the polycarbonate substrate No. 6, and the adhesive layer No. 5 was cured. The polycarbonate substrate of No. 6 was also formed by injection compression molding in the same manner as No. 1. 7 is the center hole of the disc. The adhesive layer of No. 5 was made of 45% hexanediol diacrylate, 45% dipentaerythritol hexaacrylate, 5% Irgacure 907 manufactured by Ciba Geigy, and 5% γ-glyndoxypropyl trimethoxy 7ran by weight. The mixture was applied onto the substrate on which the recording layer and the N-retaining layer had been formed, and the mixture was bonded together in a vacuum system, followed by curing by irradiating ultraviolet rays with a high-pressure mercury lamp.

Figure 2 shows that after forming tracking bits by injection molding using ABSIM resin on both sides of 13 substrates, Si
12 and 14 amorphous silicon layers were deposited on both surfaces of 13 and 500 layers by RF magnetron sputtering using a target of A total of 800 layers were deposited, and 800 protective layers of 5iAIN 10 and 16 were further deposited thereon by DC magnetron sputtering using a 5iA1 alloy target. Then, bond the epoxy substrates of 8 and 18 to 1.9
and 17 adhesive layers were cured. The epoxy substrates of Nos. 8 and 18 were formed by cast molding. 19 is the center hole of the disc. Adhesive layers 9 and 17 contain 40% neopentyl glycol diacrylate by weight.
Percent! , a mixture of 80% trimethylolpropane triacrylate, 20% dipentaerythritol hexaacrylate, 5% Irgacure 907 manufactured by Ciba Geigy, and 5% isopropylisostearoyldiacryl titanate. After coating the film on the substrate, the epoxy substrates No. 8 and No. 18 were bonded together in a vacuum system and cured by irradiation with ultraviolet rays.

Table 1 shows the results of the optical information recording medium having the configuration shown in Figure 1 at 70°C and 90°C when γ-glycidoxyprobyltrimethoxysilane was replaced with another coupling agent and the main components of 11If and adhesive were variously changed. The bit error rate when the device is left for 3000 hours under %RH is shown together with a comparative example.

Table 1 BER*:! 70°C, 90% RH, 3000 hours, pit eff-late properties immediately after lamination after bonding. Properties after 70°C, 90% RH, 3000 hours. 1 (Continued) HDDA: Hexanediol diacrylate DPHA
Nidipentaerythritol hexaacrylate NPGDA: Neobentyl glycol diacrylate TMPTA:) Limethylolpropane triacrylate PETA: Pentaerythritol tetraacrylate Irgacure 907: Photopolymerization initiator (manufactured by Ciba Geigy) Irgacure 651: Photopolymerization initiator (Ciba Geigy) Zorocure 1116: Photopolymerization initiator (manufactured by Merck & Co., Ltd.) As can be seen from the results in Table 1, one or a mixture of two or more selected from silane, titanium, or aluminum coupling agents has a weight ratio of If it is less than 0.5%, the outer circumferential side of the disk will peel off, resulting in poor long-term reliability (
, 15% or more, the pit error rate increases sharply, and it is found that the addition amount is preferably between 0.5 and 15%. In addition, urethane-based and Epokin-based adhesives and cationic polymerization-based fil! It can be seen that the adhesive is unreliable due to severe oxidation of the recording layer.

Although the present invention has been described above in terms of preferred embodiments and illustrated by specific examples, the present invention should not be considered limited thereto, and various modifications can be made without departing from the gist of the present invention. It is. For example, although a polycarbonate or epoxy substrate is used as an example in this embodiment, glass or acrylic resin may also be used, and the recording layer may be made of GdD in addition to NdDyFecoXi or TbFeCoX52.
TbFe layer, PrDyTbFeCoF! Even if it's l<,T
It can also be applied to ancestral variation types such as c-TeOx layer, In-Age, Ag-Znji, etc., and 1! There is no problem with the system using r-machine dye.

(Effects of the Invention) The optical information recording medium of the present invention has extremely low occurrence of cracks in the protective layer and recording layer, and the recording layer is susceptible to oxidation (therefore, there are no special restrictions on the storage and use environment of the optical recording medium. This has the effect of providing an optical recording medium that has an extremely wide range of applications.

[Brief explanation of the drawing]

1 and 2 are basic configuration diagrams of the optical information recording medium of the present invention. 1... Polycarbonate substrate 2... 5iAIN protective layer 3--NdDYFeCo recording layer 4...
・5iAIN protective layer 5...Adhesive layer according to the present invention 6...Polycarbonate substrate 7...Disk center hole 8.18...Epoxy substrate 9.17...Adhesion according to the present invention Layers 10.16...5 iAIN protective layer 11, 15-=TbFe Co recording layer 12.14
... Amorphous St layer 13 ... Center substrate or above 5 ... Pa〉''7;, Titano L/ is Shu 2 figure

Claims (1)

[Claims] In the close bonding of optical information recording media in which information is recorded, reproduced, or erased using light, the adhesive layer is a cured adhesive having at least radical polymerizable photocuring properties; 1. An optical information recording medium containing from 0.5 to 15 percent by weight of one or a mixture of two or more coupling agents selected from titanium, silane, and aluminum coupling agents.