JPH0344839A - Plate-type information recording medium - Google Patents
Plate-type information recording mediumInfo
- Publication number
- JPH0344839A JPH0344839A JP1179558A JP17955889A JPH0344839A JP H0344839 A JPH0344839 A JP H0344839A JP 1179558 A JP1179558 A JP 1179558A JP 17955889 A JP17955889 A JP 17955889A JP H0344839 A JPH0344839 A JP H0344839A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- flat
- information recording
- substrate
- epoxy resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 16
- 239000003822 epoxy resin Substances 0.000 claims abstract description 12
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 35
- 230000003287 optical effect Effects 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims 1
- 125000002091 cationic group Chemical group 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 5
- 230000008602 contraction Effects 0.000 abstract description 3
- 239000004925 Acrylic resin Substances 0.000 abstract description 2
- 238000003848 UV Light-Curing Methods 0.000 abstract 2
- 238000001723 curing Methods 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 238000010538 cationic polymerization reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010526 radical polymerization reaction Methods 0.000 description 2
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 238000012644 addition polymerization Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- -1 amine compound Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002954 polymerization reaction product Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、高密度情報記録または記録消去可能な光ディ
スクに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to high-density information recording or recordable and erasable optical discs.
従来の技術
光ディスクにかいては、ディスク基板に記録層を形成し
た後に、記録膜の保護のためのオーバーコート層を設け
ることが必要である。このオーバーコート層としては、
従来、アクリル酸と他のベース樹脂との付化重合反応物
と光開始剤との混合物を紫外線照射により硬化させたも
のが用いられている。For conventional optical discs, after forming a recording layer on a disc substrate, it is necessary to provide an overcoat layer to protect the recording film. As this overcoat layer,
Conventionally, a mixture of an addition polymerization reaction product of acrylic acid and another base resin, and a photoinitiator, which is cured by ultraviolet irradiation, has been used.
発明が解決しようとする課題
分子構造の末端にアクリル基を有する紫外線照射により
硬化可能な樹脂は、炭素二重結合官能基（Ｃ＝Ｃ）を−
個または複数個有しており、その二重結合が切断され、
三次元架橋することにより液体から固体に変わるが、固
化するときに液体に比べて分子間距離が縮１シ、体積収
縮が起きる。Problems to be Solved by the Invention A resin that can be cured by ultraviolet irradiation and has an acrylic group at the end of its molecular structure has a carbon double bond functional group (C=C).
or more than one, and the double bond is broken,
Three-dimensional crosslinking transforms a liquid into a solid, but when it solidifies, the intermolecular distance is reduced compared to a liquid, causing volumetric contraction.
第２図（ａ）にオーバーコート層形成前のディスク、（
ｂ）に従来の紫外線硬化型アクリレート樹脂をオーバー
コートして体積収縮によりディスク基板に反りが生じた
状態を示す。１は基板、２は無機質層、３は記録層、４
は必要に応じて設けた無機質層、５はオーバーコートｍ
であシ、−殻内にスピンコード法により形成される。FIG. 2(a) shows a disk before overcoat layer formation (
Figure b) shows a state in which the disk substrate is warped due to volumetric shrinkage after being overcoated with a conventional ultraviolet curable acrylate resin. 1 is a substrate, 2 is an inorganic layer, 3 is a recording layer, 4
5 is an inorganic layer provided as necessary, and 5 is an overcoat m.
Formed by spin cord method inside the shell.
基板が反ると、ピックアップが追従できなくなったり、
光束が表板に斜めに入射することにな９収束スポットに
収差を生じる。その結果、記録信号または再生信号の劣
化を生じる。If the board warps, the pickup may not be able to follow
Since the light beam is obliquely incident on the top plate, aberrations occur in the nine convergence spots. As a result, the recorded signal or reproduced signal deteriorates.
紫外線硬化型アクリレート樹脂にはベース樹脂としてポ
リエステルアクリレート、エポキシアクリレート、ウレ
タンアクリレート等があり、これに粘度、接着力、その
他の特性を改良するために低分子量のオリゴマーやモノ
マーを加えて使用される。紫外線に感応する光開始剤等
も加えられる。UV-curable acrylate resins include base resins such as polyester acrylate, epoxy acrylate, and urethane acrylate, to which low molecular weight oligomers and monomers are added to improve viscosity, adhesive strength, and other properties. A photoinitiator sensitive to ultraviolet light or the like may also be added.
紫外線の作用によシ液状樹脂が重合硬化するメカニズム
はいずれもラジカル重合であシ、炭素二重結合が切れて
三次元に架橋することにより硬化するものである。ベー
ス樹脂、モノマー等の混合比を変えても相当大きい体積
収縮を生じ、その硬化収縮率はｐふ・むね１０多程度に
なる。The mechanism by which liquid resins are polymerized and hardened by the action of ultraviolet rays is radical polymerization, in which carbon double bonds are broken and three-dimensional crosslinking occurs, resulting in hardening. Even if the mixing ratio of the base resin, monomer, etc. is changed, a considerably large volumetric shrinkage occurs, and the curing shrinkage rate is about 10 or more.
ポリカーボネート、アクリル等の樹脂基板ディスクにオ
ーバーコートを施すと反りを生じる。ディスクが反ると
罰述のように記録再生信号に大きい悪影響を及ぼす。ラ
ジカル重合反応の場合酸素による硬化阻害が起こり、空
気に触れている面が硬化しにくくなるという課題がある
。When an overcoat is applied to a resin substrate disk such as polycarbonate or acrylic, warping occurs. If the disc warps, it will have a large negative effect on the recorded and reproduced signals. In the case of radical polymerization reactions, there is a problem that curing is inhibited by oxygen, making it difficult to cure the surfaces exposed to air.
課題を解決するための手段
従来の炭素二重結合に基づく重合反応では、液体から固
体への変化の際に生じる構造変化により体積収縮は、不
可避であった。本発明では、従来の紫外線硬化型アクリ
レート樹脂とは反応機構の全く異なる開環重合反応に基
づく重合機構によシ反応固化するエポキシ樹脂を用いる
事により体積収縮の少ないオーバーコートを形成するこ
とができる。その結果、反りを押さえた高品質の光ディ
スクを提供することができる。Means for Solving the Problems In conventional polymerization reactions based on carbon double bonds, volumetric contraction was inevitable due to structural changes that occur when changing from liquid to solid. In the present invention, an overcoat with low volume shrinkage can be formed by using an epoxy resin that reacts and solidifies by a polymerization mechanism based on a ring-opening polymerization reaction, which has a completely different reaction mechanism from that of conventional UV-curable acrylate resins. . As a result, it is possible to provide a high quality optical disc with reduced warpage.
作 用
に基づ〈反応を用いる事によシ硬化時の体積収縮を極め
て少なくすることができる。その結果、オーバーコート
を施してもディスクの反シを極めて低く押さえることが
できる。反ジの発生を押さえることによシ信号品質の劣
化を起こさないようにすることができる。By using a reaction based on the action, volumetric shrinkage during curing can be extremely reduced. As a result, even if an overcoat is applied, the warpage of the disc can be kept extremely low. By suppressing the occurrence of curling, it is possible to prevent signal quality from deteriorating.
実施例 第１図に本発明の実施例の光ディスクを示す。Example FIG. 1 shows an optical disc according to an embodiment of the present invention.
この光ディスクに耘いては、樹脂材料よりな９−方の面
に情報構造を有する平板状の基板１の、前記構造を有す
る面に無機質層２、記録層３、無機質層４の複数の層よ
りなる情報記録層を有し、この基板１のこの情報記録層
を有する面寸たは両面に、紫外線源たは熱線の作用によ
り硬化可能なエポキシ樹脂を主成分とするオーバーコー
ト層５゜６を有する。In this optical disc, a plurality of layers including an inorganic layer 2, a recording layer 3, and an inorganic layer 4 are formed on the surface having the structure of a flat substrate 1 made of a resin material and having an information structure on its 9-side surface. An overcoat layer 5.6 mainly composed of an epoxy resin that can be cured by the action of an ultraviolet source or a heat ray is provided on the surface or both sides of the substrate 1 having the information recording layer. have
この実施例では、平板状基板１の情報構造を有する而に
、順次第一の無機質層２、磁性記録層３、第二の無機質
層４必要に応じて第三の無機質膜が形成されて記録層と
されている。記録層は単層であってもよい。In this embodiment, the information structure of the flat substrate 1 is formed, and a first inorganic layer 2, a magnetic recording layer 3, a second inorganic layer 4 are sequentially formed as needed, and a third inorganic film is formed for recording. It is said to be a layer. The recording layer may be a single layer.
記録層としては相変化により光学的特性変化を生じる記
録層が形成されている。As a recording layer, a recording layer that causes optical characteristics to change due to a phase change is formed.
エポキシ樹脂は分子中にエポキシを１個以上有している
。樹脂の種類としてはビスフェノ−１ｖ１５゜型、ノボ
ラック型、グリセリン型、ポリオレフィン型等がある。Epoxy resin has one or more epoxy molecules in its molecule. Types of resin include bispheno-1v15° type, novolac type, glycerin type, polyolefin type, etc.
ビスフェノ−／ｌ／Ａ型が一般的に多く用いられている
。その中のエポキシ環が開裂し三次元架橋が進行する。Bispheno-/l/A type is commonly used. The epoxy ring therein cleaves and three-dimensional crosslinking progresses.
熱エネルギーで開裂硬化させるためはアミン系化合物が
用いられる。しかし熱線のエネルギーはフォトンのエネ
ルギーに比べると極めて小さく硬化に時間がかかる。通
常数十分から２０時間程度必要である。光ディスクのプ
ロセスに用いるには時間がかかりすぎ生産性が極めて悪
い。An amine compound is used for cleavage curing with thermal energy. However, the energy of heat rays is extremely small compared to the energy of photons, and curing takes time. It usually takes from several tens of minutes to about 20 hours. It takes too much time to be used in the process of optical discs, and productivity is extremely low.
そこで、紫外線を用いて短時間に硬化させるためにカチ
オン重合可能な光開始剤を用いる。ここで用いる光開始
剤は、触媒として作用するものであシそれ自身は最終硬
化物の中に残らない。カチオン重合を開始させる触媒と
してはジアリルヨードニウムＪｉ、）、リアリルスｌレ
フオニウム塩、アリルジアゾニウム塩等がある。樹脂組
成としてはエポキシベース樹脂に種々の添加物を加えて
用いる。Therefore, a photoinitiator capable of cationic polymerization is used to cure the material in a short time using ultraviolet rays. The photoinitiator used here acts as a catalyst and does not itself remain in the final cured product. Catalysts for initiating cationic polymerization include diallyliodonium Ji, ), realylthlephonium salts, allyldiazonium salts, and the like. The resin composition is an epoxy base resin with various additives added thereto.
表１に実施例を示す。Examples are shown in Table 1.
表 １
スチレンコポリマーは、硬化物の可とう性を改善し収縮
率を低減するために加える。上記の組成の樹脂をディス
クにコーティング下結果を次に示す。Table 1 Styrene copolymer is added to improve the flexibility of the cured product and reduce shrinkage. The results of coating a disk with the resin of the above composition are shown below.
コーティングはスピンナーを用いた。A spinner was used for coating.
表
記録膜ｆｌｌｌにコーティングした場合もポリカーボネ
ート表面にコーティングした場合も基盤目試験ではがれ
を生゛じず、非常によい密着性を示した。Whether it was coated on the front recording film or on the surface of polycarbonate, it did not peel off in the substrate test and showed very good adhesion.
硬化に伴う体積収縮は３多以下の低収縮であった。The volumetric shrinkage due to curing was as low as 3 or less.
φ１３０Ｈディスクの片面にコーティングした場合も両
面にコーティングした場合も反りの発生は極めて小さく
、チルト角は１ｍｒａｄ、以下であった。When coating one side of the φ130H disk and coating both sides, the occurrence of warpage was extremely small, and the tilt angle was 1 mrad or less.
開環重合反応であるため従来のアクリレート系紫外線硬
化型樹脂に比べ反り量を極めて小さく抑えることができ
たｕ極めて窒素置換をすることなく表面にタックは残ら
ず非常に良い硬化性を示した。Because it is a ring-opening polymerization reaction, the amount of warpage can be kept to an extremely low level compared to conventional acrylate-based ultraviolet curable resins.It exhibits very good curing properties without leaving any tack on the surface without the need for nitrogen substitution.
発明の効果
このように、本発明の光ディスクによれば、紫外線硬化
型のエポキシ樹脂をディスク基板のコティング剤として
用いたことにより、密着性の良い、低収縮率の皮膜を形
成することができた。その結果、ディスク基板の反りを
きわめて小さく抑えることができ、機械特性の良いディ
スクを得ることができた。コーティングは記録面のみに
施してもよく、基板の両側に施してもよい。Effects of the Invention As described above, according to the optical disc of the present invention, by using an ultraviolet curable epoxy resin as a coating agent for the disc substrate, it was possible to form a film with good adhesion and a low shrinkage rate. . As a result, the warpage of the disk substrate could be kept to an extremely low level, and a disk with good mechanical properties could be obtained. The coating may be applied only to the recording surface or to both sides of the substrate.
第１図ａ、ｂは本発明の一実施例の光ディスクの断面図
、第２図ａ、Ｊは従来例の光ディスクの断面図である。
１・・・・・・基板、２，４・・・・・・無機質層、３
・・・・・・記録層、５，６・・・オーバーコート層。1A and 1B are cross-sectional views of an optical disk according to an embodiment of the present invention, and FIGS. 2A and 2J are cross-sectional views of a conventional optical disk. 1... Substrate, 2, 4... Inorganic layer, 3
...Recording layer, 5, 6... Overcoat layer.
Claims (8)
板状基板の、前記構造を有する面に単層または複数の層
よりなる情報記録層を有し、前記基板の情報記録層を有
する面または両面に紫外線または熱線の作用により硬化
可能なエポキシ樹脂を主成分とするオーバーコート層を
有することを特徴とする平板状情報記録担体。(1) A flat substrate made of a resin material and having an information structure on one surface, having an information recording layer consisting of a single layer or a plurality of layers on the surface having the structure, and the surface of the substrate having the information recording layer. Alternatively, a flat information recording carrier characterized in that it has on both sides an overcoat layer mainly composed of an epoxy resin that can be cured by the action of ultraviolet rays or heat rays.
無機質膜、磁性層、第二の無機質膜、必要に応じて第三
の無機質膜が形成されて記録層とされていることを特徴
とする請求項１記載の平板状情報記録担体。(2) A first inorganic film, a magnetic layer, a second inorganic film, and, if necessary, a third inorganic film are sequentially formed on the surface of the flat substrate having the information structure to form a recording layer. The flat information recording carrier according to claim 1, characterized in that:
て相変化により光学的特性変化を生じる記録層が形成さ
れていることを特徴とする請求項１記載の平板状情報記
録担体。(3) The flat information recording carrier according to claim 1, characterized in that a recording layer that causes a change in optical characteristics due to a phase change is formed as a recording layer on the surface having the information structure of the flat substrate.
面に、同一組成のエポキシ樹脂を主成分とするオーバー
コート層が形成されていることを特徴とする請求項１記
載の平板状情報記録担体。(4) Flat information according to claim 1, characterized in that an overcoat layer mainly composed of an epoxy resin having the same composition is formed on the surface of the flat substrate having the recording layer and the surface of the other substrate. record carrier.
が、エポキシ樹脂を６０〜９５重量％、スチレンコポリ
マーを３〜３５重量％含むものであることを特徴とする
請求項１記載の平板状情記録担体。(5) The flat substrate according to claim 1, wherein the resin layer formed on one or both sides of the flat substrate contains 60 to 95% by weight of epoxy resin and 3 to 35% by weight of styrene copolymer. record carrier.
いることを特徴とする請求項１記載の平板状情報記録担
体。(6) The flat information recording carrier according to claim 1, wherein the epoxy resin layer has a thickness of 5 to 100 μm.
ウム塩を０．２〜２％含有していることを特徴とする請
求項１記載の平板状情報記録担体。(7) The flat information recording carrier according to claim 1, which contains 0.2 to 2% of a sulfonium salt as a cationic polymerizable photoinitiation catalyst.
粘度が、常温にて２０００センチポイズ以下であること
を特徴とする請求項１記載の平板状情報記録担体。(8) The flat information recording carrier according to claim 1, wherein the overcoat agent containing an epoxy resin as a main component has a viscosity of 2000 centipoise or less at room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1179558A JPH0344839A (en) | 1989-07-11 | 1989-07-11 | Plate-type information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1179558A JPH0344839A (en) | 1989-07-11 | 1989-07-11 | Plate-type information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0344839A true JPH0344839A (en) | 1991-02-26 |
Family
ID=16067837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1179558A Pending JPH0344839A (en) | 1989-07-11 | 1989-07-11 | Plate-type information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0344839A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5770694A (en) * | 1980-10-20 | 1982-05-01 | Toshiba Corp | Information-recording member |
| JPS59227045A (en) * | 1983-06-06 | 1984-12-20 | Toyo Ink Mfg Co Ltd | Information recording medium |
| JPH0268746A (en) * | 1988-09-05 | 1990-03-08 | Canon Inc | Optical recording medium |
| JPH02107630A (en) * | 1988-10-18 | 1990-04-19 | Nippon Kayaku Co Ltd | Resin composition and overcoat composition for optical disk |
-
1989
- 1989-07-11 JP JP1179558A patent/JPH0344839A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5770694A (en) * | 1980-10-20 | 1982-05-01 | Toshiba Corp | Information-recording member |
| JPS59227045A (en) * | 1983-06-06 | 1984-12-20 | Toyo Ink Mfg Co Ltd | Information recording medium |
| JPH0268746A (en) * | 1988-09-05 | 1990-03-08 | Canon Inc | Optical recording medium |
| JPH02107630A (en) * | 1988-10-18 | 1990-04-19 | Nippon Kayaku Co Ltd | Resin composition and overcoat composition for optical disk |
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