JP2508336B2 - optical disk - Google Patents
optical diskInfo
- Publication number
- JP2508336B2 JP2508336B2 JP2012834A JP1283490A JP2508336B2 JP 2508336 B2 JP2508336 B2 JP 2508336B2 JP 2012834 A JP2012834 A JP 2012834A JP 1283490 A JP1283490 A JP 1283490A JP 2508336 B2 JP2508336 B2 JP 2508336B2
- Authority
- JP
- Japan
- Prior art keywords
- adhesive
- optical disk
- epoxy resin
- adhesive layer
- bisphenol
- 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.)
- Expired - Fee Related
Links
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は光ディスク、特に書換え可能な光ディスクに
関するものである。TECHNICAL FIELD The present invention relates to an optical disc, and more particularly to a rewritable optical disc.
［従来の技術］ 第１図は、一般的な光ディスクの断面図で、ポリカー
ボネート等の透明樹脂基板（１）上に記録膜（２）を形
成すると共にその上に保護膜（３）を設けてディスク材
（４）を形成し、同様に形成した他のディスク材（４）
を用意し、その保護膜（３）同士を接着層にて貼り合わ
せていた。即ち、例えば特開昭61−50213号公報にスピ
ンコートにより接着剤を全面塗布し、ディスクの中心軸
を合わせて貼り合わせを行う方法や、特開昭61−292244
号公報に、接着剤を部分的に塗布して貼り合わせ、加圧
して全面接着する方法が示されている。[Prior Art] FIG. 1 is a cross-sectional view of a general optical disc in which a recording film (2) is formed on a transparent resin substrate (1) such as polycarbonate and a protective film (3) is provided thereon. Disc material (4) is formed and another disc material (4) formed in the same manner
Was prepared, and the protective films (3) were attached to each other with an adhesive layer. That is, for example, JP-A-61-50213 discloses a method in which an adhesive is applied over the entire surface by spin coating, and the central axes of the disks are aligned to carry out the bonding, and JP-A-61-292244.
Japanese Unexamined Patent Publication (Kokai) No. 2003-242242 discloses a method in which an adhesive is partially applied, bonded together, and pressed to bond the entire surface.
［発明が解決しようとする課題］ 従来貼り合わせのための接着剤として熱や紫外線によ
る硬化型の接着剤や、熱可塑型接着剤を用いていた。し
かし、記録膜が腐食しやすく信頼性が低下するという課
題があった。記録膜の腐食の原因としては、接着層に含
まれる腐食性成分が考えられるが、光ディスクの腐食発
生率を低下するには、腐食性成分を含まない接着剤を用
いるだけでは充分ではなかった。又、一液性エポキシ樹
脂接着剤等の嫌気性あるいは湿気硬化型の接着剤は、デ
ィスクのような広い面積を薄い接着層で貼合わせる場
合、内部まで空気や水分が浸透し難く硬化が不完全であ
ったり、時間が非常にかかったりして貼合わせること自
体が難しい。又、二液性で非混合タイプのものや、マイ
クロカプセル化した接着剤は未硬化成分が残留しやす
く、簡易な試験段階で腐食発生、接着強度の不十分等の
結果により使用をみあわせている。[Problems to be Solved by the Invention] Conventionally, an adhesive curable by heat or ultraviolet rays or a thermoplastic adhesive has been used as an adhesive for bonding. However, there is a problem that the recording film is easily corroded and the reliability is lowered. Although the corrosive component contained in the adhesive layer is considered as the cause of the corrosion of the recording film, it was not enough to use the adhesive containing no corrosive component to reduce the corrosion occurrence rate of the optical disk. In addition, anaerobic or moisture-curing adhesives such as one-component epoxy resin adhesives do not completely cure when air or moisture penetrates inside when a large area such as a disk is pasted with a thin adhesive layer. However, it is very difficult to stick together because it takes a lot of time. In addition, uncured components are likely to remain in two-component, non-mixed type adhesives and microencapsulated adhesives, so corrosion is generated at the simple test stage, and the adhesive strength is insufficient. There is.
又、硬化型の接着剤の場合、硬化に際する収縮のため
歪みが残り、ディスクの変形など不良発生の原因となっ
ていた。Further, in the case of a curable adhesive, distortion remains due to shrinkage during curing, which causes defects such as disk deformation.
さらに硬化型の接着剤で形成された接着層の硬度が小
さい場合や、熱可塑型接着剤で塗布により接着層にムラ
や模様などの不均一性が生じた場合、プラスチック基板
を透つた水分により膜に部分的な膨れを発生し膜の剥離
や割れ等の原因となる課題があつた。Furthermore, if the hardness of the adhesive layer formed with a curable adhesive is low, or if the adhesive layer causes non-uniformity such as unevenness or a pattern due to application with a thermoplastic adhesive, moisture that penetrates the plastic substrate There is a problem in that the film is partially swollen and causes peeling or cracking of the film.
又、貼り合わせ工程に際しては、接着剤の粘度によつ
てはデイスクの内外周に接着剤のはみだしや、逆に塗布
残し、気泡の残留等の不良の発生が増加するという課題
があつた。In addition, in the laminating step, there is a problem in that, depending on the viscosity of the adhesive, protrusion of the adhesive on the inner and outer peripheries of the disk, or conversely, coating is left behind, and defects such as residual air bubbles increase.
本発明はかかる課題を解決するためになされたもの
で、記録膜の腐食の原因となる水分による酸化を防止
し、デイスクの変形、膨れの発生等を防止することによ
り、高い信頼性が得られ、かつ製品の品質向上を図れる
と共に貼り合わせ工程中の不良の発生の低減が図れ、ま
た本発明の別の発明はさらに高い信頼性が得られる光デ
イスクを得ることを目的とするものである。The present invention has been made in order to solve the above problems, and high reliability can be obtained by preventing oxidation due to water that causes corrosion of the recording film and preventing deformation of the disk and swelling. Another object of the present invention is to obtain an optical disk that can improve the quality of the product and reduce the occurrence of defects during the laminating process, and another aspect of the present invention has a higher reliability.
［課題を解決するための手段］ 本発明の光デイスクは、TbFeCo系記録層を形成した各
透明基板の上記記録層を互いに対向させ、上記記録層間
に接着層を介在させたものにおいて、上記接着層がビス
フェノール型エポキシ樹脂を本剤、変性脂肪族ポリアミ
ンを硬化剤とする二液性エポキシ接着剤の硬化物で形成
され、吸水率が0.2％以下、硬度80〜90ショアスケール
であることを特徴とするものである。[Means for Solving the Problems] The optical disk of the present invention is one in which the recording layers of the respective transparent substrates on which the TbFeCo recording layers are formed are made to face each other and an adhesive layer is interposed between the recording layers. The layer is made of a cured product of a two-part epoxy adhesive containing a bisphenol type epoxy resin as the main agent and a modified aliphatic polyamine as the curing agent, and has a water absorption rate of 0.2% or less and a hardness of 80 to 90 Shore scale. It is what
本発明の別の発明の光デイスクは、TbFeCo系記録層を
形成した各透明基板の上記記録層を互いに対向させ、上
記記録層間に接着層を介在させたものにおいて、上記記
録層がビスフェノール型エポキシ樹脂を本剤、粘度が10
0cps以下の変性脂肪族ポリアミンを硬化剤とする二液性
エポキシ接着剤の硬化物で形成され、吸水率が0.2％以
下、硬度80〜90ショアスケールであることを特徴とする
ものである。An optical disc according to another invention of the present invention is one in which the recording layers of the respective transparent substrates on which TbFeCo recording layers are formed are opposed to each other and an adhesive layer is interposed between the recording layers, and the recording layer is a bisphenol type epoxy. Resin is this agent, viscosity is 10
It is formed of a cured product of a two-part epoxy adhesive having a modified aliphatic polyamine of 0 cps or less as a curing agent, and has a water absorption rate of 0.2% or less and a hardness of 80 to 90 Shore scale.
［作用］ 本発明の光デイスクは、接着剤に上記特性のものを用
いることにより、腐食の原因となるディスクの変形や膨
れの発生および水分による酸化を防止することができ、
厳しい耐食性を要求されるTbFeCo系記録膜の腐食を防止
することができる。[Operation] In the optical disc of the present invention, by using the adhesive having the above characteristics, it is possible to prevent the deformation and swelling of the disk which causes corrosion and the oxidation due to water.
It is possible to prevent corrosion of the TbFeCo-based recording film that requires severe corrosion resistance.
［実施例］ 本発明の実施例の光デイスクを形成する単位となるデ
イスク材は、従来の公知の方法によつて形成された物で
よく、例えばグルーブを形成したポリカーボネート基板
上に、SiNx等の誘電体膜を形成した後、TbFeCo垂直磁気
異方性を有する非結晶記録膜を形成し、その上にSiNx等
の保護膜を形成して得られ、このデイスク材を接着して
本発明の実施例の光デイスクを得るには、接着材によつ
てこれら２枚のデイスク材の保護膜相互を接着すること
が必要である。即ち、第１図において、（１）は例えば
ポリカーボネート基板、（２）はTbFeCo記録膜、（３）
は例えばSiNx保護膜、（４）はデイスク材、（５）は接
着層で、この接着層を形成する接着剤に本発明の特徴が
ある。即ち、本発明においては、上記接着剤がビスフェ
ノール型エポキシ樹脂を本剤、変性脂肪族ポリアミンを
硬化剤とする二液性エポキシ接着剤の硬化物で形成さ
れ、吸水率が0.2％以下、硬度80〜90ショアスケールで
あること、又本発明の別の発明においては、上記接着剤
が、ビスフェノール型エポキシ樹脂を本剤、常温で粘度
100cps以下の変性脂肪族ポリアミンを硬化剤とする二液
性エポキシ接着剤の硬化物で形成され、吸水率が0.2％
以下、硬度80〜90ショアスケールであることが必要であ
る。また、本発明の光デイスクに係わる接着剤の本剤の
ビスフェノール型エポキシ樹脂としては、例えばビスフ
ェノールＡ型エポキシ樹脂｛スリーボンド製 商品名TB
2022｝およびビスフェノールＦ型エポキシ樹脂｛スリー
ボンド製 商品名TB2023｝が用いられる。例えば上記以
外の組合せによる二液性エポキシ系接着剤および一液性
エポキシ系接着剤等は接着剤に含まれる腐食成分により
記録膜が酸化劣化することが実験により解った。なお、
上記実験は、ビスフェノールＡ型エポキシ樹脂を本剤と
する接着剤を用いて行つたが、ビスフェノールＦ型エポ
キシ樹脂を本剤とする接着剤を用いた場合も同様の結果
が得られる。[Example] The disk material, which is a unit forming the optical disk of the example of the present invention, may be one formed by a conventionally known method, for example, a polycarbonate substrate having a groove formed thereon, such as SiNx. After the dielectric film is formed, an amorphous recording film having TbFeCo perpendicular magnetic anisotropy is formed, and a protective film such as SiNx is formed on the amorphous recording film, which is obtained by adhering this disk material. In order to obtain the example optical disk, it is necessary to bond the protective films of these two disk materials to each other with an adhesive material. That is, in FIG. 1, (1) is a polycarbonate substrate, (2) is a TbFeCo recording film, (3)
Is a SiNx protective film, (4) is a disk material, and (5) is an adhesive layer, and the adhesive forming this adhesive layer is a feature of the present invention. That is, in the present invention, the adhesive is formed of a cured product of a two-part epoxy adhesive having a bisphenol type epoxy resin as the main agent and a modified aliphatic polyamine as the curing agent, and the water absorption rate is 0.2% or less and the hardness is 80%. ~ 90 Shore scale, in another invention of the present invention, the adhesive is a bisphenol type epoxy resin, this agent, viscosity at room temperature
Formed from a cured product of a two-part epoxy adhesive with a modified aliphatic polyamine of 100 cps or less as the curing agent, with a water absorption rate of 0.2%.
Hereinafter, it is necessary that the hardness is 80 to 90 Shore scale. Examples of the bisphenol type epoxy resin of the present agent of the adhesive relating to the optical disc of the present invention include bisphenol A type epoxy resin {trade name TB manufactured by ThreeBond.
2022} and bisphenol F-type epoxy resin (trade name TB2023 manufactured by ThreeBond) are used. For example, it has been found through experiments that the recording films of two-component epoxy adhesives and one-component epoxy adhesives in combinations other than those described above are oxidized and deteriorated by the corrosive components contained in the adhesives. In addition,
The above experiment was carried out using an adhesive containing a bisphenol A type epoxy resin as the main agent, but similar results are obtained when an adhesive containing a bisphenol F type epoxy resin as the main agent is used.
第２図は本発明の実施例の光デイスクと従来例の光デ
イスクの腐食発生率を比較する特性図で、各光デイスク
を60℃、90％RH雰囲気中に1000時間投入し発生した腐食
の面積を全体の割合で求めて比較したものであり、図に
おいて縦軸は腐食発生面積率（％）、横軸は光デイスク
の種類であり、A1（ｉ＝１〜５）は、ビスフェノールＡ
型エポキシ樹脂（スリーボンド性 TB2022）と変性脂肪
族ポリアミン（スリーボンド性2131D）の組合せで、硬
化剤の粘度が異なる（例えばA4の粘度は110cps,A5の粘
度は2800cps）接着剤、Bj（ｊ＝１〜３）は、ビスフェ
ノールＡ型エポキシ樹脂と変性ポリアミドアミンの組合
せ、Ck（ｋ＝１〜３）は、ビスフェノールＡ型エポキシ
樹脂とポリチオールの組合せ、D1（１＝１〜３）は、光
デイスク用熱可塑性接着剤を用いたものである。図か
ら、接着剤にビスフェノールＡ型エポキシ樹脂と変性脂
肪族ポリアミンを用いた光ディスクの腐食発生率に比
べ、接着剤にポリチオール等を硬化剤とするものを用い
たものは腐食成分としてイオウを含有するため、また接
着剤に熱可塑性樹脂を用いたものは膨れのため、腐食発
生率が高いと考えられる。第３図は、ビスフェノールＡ
型エポキシ樹脂（スリーボンド製 TB2022）と粘度が異
なる変性脂肪族ポリアミン（スリーボンド製 2131D）を
接着剤に用いた光デイスクの腐食発生率を示す特性図
で、縦軸は腐食発生面積率（％）、横軸は変性脂肪族ポ
リアミンの粘度（cps at25℃）である。なお、光デイス
クは上記各接着剤を用いる他は同条件にして得た物を用
いた。図に示すように、ビスフェノールＡ型エポキシ樹
脂と変性脂肪族ポリアミンの組合せのものが腐食発生が
小さく、しかも硬化剤の粘度が100cps（25℃）以下のも
のが他と比べて腐食発生が特に小さいという結果が得ら
れた。なお図中、D1のものが腐食発生面積率がかなり低
いが、後に示すフクレ発生数が高いので好ましくない。FIG. 2 is a characteristic diagram comparing the corrosion occurrence rates of the optical disk of the embodiment of the present invention and the optical disk of the conventional example. Corrosion that occurs for 1000 hours when each optical disk is put in an atmosphere of 60 ° C. and 90% RH is shown. The area is calculated by the ratio of the whole, and the vertical axis in the figure is the corrosion occurrence area ratio (%), the horizontal axis is the type of optical disk, and A 1 (i = 1 to 5) is bisphenol A.
Type epoxy resin (three bond property TB2022) and modified aliphatic polyamine (three bond property 2131D) in combination, the viscosity of the curing agent is different (for example, viscosity of A 4 is 110 cps, viscosity of A 5 is 2800 cps) adhesive, B j ( j = 1 to 3) is a combination of bisphenol A type epoxy resin and modified polyamidoamine, C k (k = 1 to 3) is a combination of bisphenol A type epoxy resin and polythiol, D 1 (1 = 1 to 3) Is one using a thermoplastic adhesive for optical discs. From the figure, compared with the corrosion occurrence rate of the optical disc using the bisphenol A type epoxy resin and the modified aliphatic polyamine as the adhesive, the one using polythiol as the curing agent as the adhesive contains sulfur as the corrosion component. Therefore, it is considered that the rate of corrosion is high because the adhesive using the thermoplastic resin is swollen. Figure 3 shows bisphenol A
Type epoxy resin (TB2022 made by ThreeBond) and a modified aliphatic polyamine (2131D made by ThreeBond) having different viscosities as adhesives are characteristic charts showing the corrosion occurrence rate of the optical disk, the vertical axis shows the corrosion occurrence area ratio (%), The horizontal axis is the viscosity (cps at 25 ° C) of the modified aliphatic polyamine. The optical disk used was obtained under the same conditions except that the above adhesives were used. As shown in the figure, the combination of the bisphenol A type epoxy resin and the modified aliphatic polyamine causes less corrosion, and the curing agent with a viscosity of 100 cps (25 ° C) or less causes less corrosion than others. The result was obtained. In the figure, D 1 has a considerably low area ratio of corrosion generation, but it is not preferable because the number of blisters generated later is high.
第４図はビスフェノールＡ型エポキシ樹脂（スリーボ
ンド製 TB2022）と変性脂肪族ポリアミン（スリーボン
ド製 2131D）等を用い、その硬化物の吸水率（煮沸１時
間）の異なるものを接着層として用いた光デイスクを60
℃、90％RH雰囲気中に1000時間投入し発生した腐食発生
数の吸水率（％）による変化を示す特性図であり、縦軸
は腐食発生数、横軸は吸水率（％）である。図に示すよ
うに、比較的腐食発生率の小さいビスフェノールＡ型エ
ポキシ樹脂と変性脂肪族ポリアミンの中でも、吸水率に
より腐食発生率が異なるのがわかる。特に、硬化後の接
着層の吸水率が0.2％以下のものは腐食の発生が見られ
ず、従つて、硬化後の吸水率は0.2％以下であることが
必要である。Fig. 4 shows an optical disk using a bisphenol A type epoxy resin (TB2022 made by ThreeBond) and a modified aliphatic polyamine (2131D made by ThreeBond) with different water absorption (boiled for 1 hour) as the adhesive layer. 60
FIG. 4 is a characteristic diagram showing a change in the number of corrosion occurrences caused by 1000 hours in a 90 ° C., 90% RH atmosphere, with the water absorption rate (%) on the vertical axis, and the water absorption rate (%) on the horizontal axis. As shown in the figure, it can be seen that even in the bisphenol A type epoxy resin and the modified aliphatic polyamine, which have a relatively low corrosion occurrence rate, the corrosion occurrence rate differs depending on the water absorption rate. In particular, corrosion does not occur in the adhesive layer having a water absorption rate of 0.2% or less after curing, and accordingly, the water absorption rate after curing needs to be 0.2% or less.
第５図は各種硬化型の接着剤を接着層に用いた光デイ
スクの最大反り角（mrad）と、貼合わせによつて増加し
た複屈折（nm）の最大量を示す特性図であり、図におい
て、縦軸は光デイスクの最大反り角（mrad）及び複屈折
（nm）の最大量、横軸は各種硬化型の接着剤を用いた光
デイスクであり、A,X,YおよびＺは各々接着剤が例えば
ビスフェノールＡ型エポキシ樹脂（スリーボンド製 TB2
022）と変性脂肪族ポリアミン（スリーボンド製 2131
D）等の室温硬化型エポキシ樹脂、一般的な30℃加熱硬
化型、80℃加熱硬化型および紫外線硬化型接着剤を用い
たものである。FIG. 5 is a characteristic diagram showing the maximum warp angle (mrad) of an optical disk using various curable adhesives in the adhesive layer and the maximum amount of birefringence (nm) increased by bonding. , The vertical axis is the maximum warp angle (mrad) and maximum birefringence (nm) of the optical disk, the horizontal axis is the optical disk using various curable adhesives, and A, X, Y, and Z are respectively The adhesive is, for example, bisphenol A type epoxy resin (3Bond TB2
022) and modified aliphatic polyamine (2131 manufactured by ThreeBond)
Room temperature curable epoxy resins such as D), general 30 ° C. heat curable type, 80 ° C. heat curable type and UV curable type adhesive are used.
第６図は上記室温硬化型接着剤を用いた光デイスク
の、接着剤の硬化収縮率による最大反り角（mrad）と、
貼合わせによつて増加した複屈折（nm）の最大量変化を
示す特性図であり、図において、縦軸は光デイスクの最
大反り角（mrad）及び複屈折（nm）の最大量、横軸は接
着剤の硬化収縮率である。これらの結果により、30℃以
上の加熱を伴う熱硬化型接着剤や紫外線硬化型接着剤、
室温硬化型の接着剤でも硬化収縮率が1.0％を越える場
合は硬化後の歪みが大きくデイスクの変形、反りや複屈
折の増加を伴い貼合わせ接着剤は室温硬化可能で、硬化
収縮率が1.0％以下であることが必要である。FIG. 6 shows the maximum warp angle (mrad) of the optical disk using the above room temperature curable adhesive, which is caused by the curing shrinkage of the adhesive.
It is a characteristic diagram showing the maximum amount change of birefringence (nm) increased by laminating, in the figure, the vertical axis is the maximum warp angle (mrad) and maximum amount of birefringence (nm) of the optical disk, and the horizontal axis. Is the cure shrinkage of the adhesive. Based on these results, a thermosetting adhesive or an ultraviolet curable adhesive accompanied by heating at 30 ° C or higher,
Even with room temperature curing type adhesives, if the curing shrinkage exceeds 1.0%, the strain after curing is large and the bonding adhesive can be cured at room temperature with deformation of the disk, warpage and increase in birefringence, and the curing shrinkage is 1.0. % Or less is required.
第７図は各種硬化型の接着剤を用いた光デイスクの温
湿度サイクルテスト（JIS−C5024方法 I）30サイクル後
のフクレ発生数を示す特性図である。図において、縦軸
はフクレ発生数、横軸は各種硬化型の接着剤を接着層に
用いた光デイスクであり、A1〜A4は接着剤が例えばビス
フェノールＡ型エポキシ樹脂（スリーボンド製 TB202
2）と変性脂肪族ポリアミン（スリーボンド製2131D）等
の硬度85ショアＤスケールの室温硬化型エポキシ樹脂、
D1〜D4は接着剤が熱可塑性樹脂のものをローラー塗布し
たものである。図によると、熱可塑性接着剤を例えばロ
ーラーで塗布した場合に生じる接着層のムラ、模様等の
微小な不均一性は部分的に水分がプラスチック基板を浸
透して膜と基板の界面にたまるために生じる膜のフクレ
を発生しやすくなり、膜の剥離や割れなどの劣化の原因
となる。従つて接着層は均一であると共に、硬度が一定
以上であることが必要であることがわかる。そこで、硬
度の異なる接着剤を試みた。即ち、第８図は例えばビス
フェノールＡ型エポキシ樹脂（スリーボンド製 TB202
2）と変性脂肪族ポリアミン（スリーボンド製 2131D）
等の室温硬化型エポキシ樹脂を主成分とした硬化型の接
着剤の硬化物の各硬度のものを用いた光デイスクの温湿
度サイクルテスト（JIS−C5024方法 I）30サイクル後の
硬度によるフクレ発生数およびデイスク落下破断耐強度
変化を示す特性図である。図において、縦軸はフクレ発
生数およびデイスク落下破断耐強度（硬度85の結果を10
0とする）、横軸は硬化型の接着剤の硬度である。図に
よると、フクレは80ショアＤスケール以上で激減しほぼ
０になる。ただしデイスクの落下による破断テストを行
つたところ、90ショアＤスケールまではほぼ同程度の耐
強度を有するが、90を越えると急激に破断しやすくな
る。これより、接着層の硬度は80以上90以下ショアＤス
ケールにあることが必要である。FIG. 7 is a characteristic diagram showing the number of blisters after 30 cycles of temperature / humidity cycle test (JIS-C5024 method I) of an optical disk using various curable adhesives. In the figure, the vertical axis is the number of blisters, the horizontal axis is an optical disk using various curable adhesives in the adhesive layer, and A 1 to A 4 are, for example, bisphenol A epoxy resin (TB202 manufactured by ThreeBond).
2) and modified aliphatic polyamine (2131D made by ThreeBond) etc., a room temperature curable epoxy resin with a hardness of 85 Shore D scale,
D 1 to D 4 are roller-coated adhesives having a thermoplastic resin. According to the figure, the minute non-uniformity of the adhesive layer, such as when the thermoplastic adhesive is applied with a roller, the minute non-uniformity is due to the fact that water partially penetrates the plastic substrate and accumulates at the interface between the film and the substrate. The blistering of the film is likely to occur, which causes deterioration such as peeling or cracking of the film. Therefore, it is understood that the adhesive layer needs to be uniform and have a hardness not less than a certain level. Therefore, we tried adhesives with different hardness. That is, FIG. 8 shows, for example, bisphenol A type epoxy resin (TB202 manufactured by ThreeBond).
2) and modified aliphatic polyamine (2131D made by ThreeBond)
Temperature-humidity cycle test of optical disc using each hardness of hardened adhesive of room temperature-curable epoxy resin (JIS-C5024 method I) Blistering due to hardness after 30 cycles It is a characteristic view showing the number and the disc drop rupture strength change. In the figure, the vertical axis indicates the number of blisters and the disc drop fracture strength (hardness 85 is 10
0), and the horizontal axis is the hardness of the curable adhesive. According to the figure, blisters drop sharply above 80 Shore D scale and become almost zero. However, when a rupture test was performed by dropping the disk, it had almost the same strength up to the 90 Shore D scale, but when it exceeded 90, it was likely to break rapidly. Therefore, the hardness of the adhesive layer must be 80 or more and 90 or less on the Shore D scale.
第９図は例えばビスフェノールＡ型エポキシ樹脂（ス
リーボンド製 TB2022）と変性脂肪族ポリアミン（スリ
ーボンド製 2131D）等の室温硬化型エポキシ樹脂を主成
分とした硬化型接着剤を、加圧なしで塗布した時の接着
剤の粘度による塗り残し面積率（％）およびはみ出し周
囲長（％）変化を示す特性図である。図において縦軸は
塗り残し面積率（％）およびはみ出し周囲長（％）、横
軸は接着剤の塗布時の粘度（cps at25℃）である。図に
よると、均一な接着層を得るためには貼合わせ工程上、
塗布時の粘度が1000cpsを越えると塗り残し面積が急に
増加し、100cpsより小さい場合、あるいは塗り残しを無
くするために加圧したりした場合にはデイスクの内外周
に接着剤のはみだしが発生し、貼合わせ後除去する工程
を付加したり、機械特性上問題になるので、粘度は100c
ps以上1000cps以下であることが必要である。又気泡の
残留しない均一な接着層を得るためには接着剤の混合、
脱泡、塗布、貼合わせという工程が必要で、この工程に
最低１時間以上を要するため、接着剤の可使時間は１時
間以上であることが必要である。FIG. 9 shows a case where a curable adhesive mainly composed of a room temperature curable epoxy resin such as bisphenol A type epoxy resin (TB2022 manufactured by ThreeBond) and modified aliphatic polyamine (2131D manufactured by ThreeBond) is applied without pressure. FIG. 6 is a characteristic diagram showing changes in the uncoated area ratio (%) and the protruding peripheral length (%) depending on the viscosity of the adhesive. In the figure, the vertical axis represents the uncoated area ratio (%) and the protruding peripheral length (%), and the horizontal axis represents the viscosity of the adhesive when applied (cps at 25 ° C). According to the figure, in order to obtain a uniform adhesive layer,
If the viscosity during coating exceeds 1000 cps, the uncoated area will increase abruptly, and if it is less than 100 cps or if pressure is applied to eliminate uncoated area, adhesive squeeze will occur on the inner and outer circumferences of the disk. , The viscosity is 100c because it adds a step to remove after laminating or it causes a problem in mechanical properties.
It must be between ps and 1000 cps. Also, in order to obtain a uniform adhesive layer in which no air bubbles remain, mixing of adhesives,
The steps of defoaming, coating and laminating are required, and at least 1 hour is required for this step. Therefore, the pot life of the adhesive is required to be 1 hour or more.
以下この発明を実施例によりさらに具体的に説明す
る。Hereinafter, the present invention will be described more specifically by way of examples.
実施例１ 二液性エポキシ系接着剤は、粘度（25℃）13000cpsの
ビスフェノールＡ型エポキシ樹脂の本剤（スリーボンド
製 TB2022）と粘度10CPSの変性脂肪族ポリアミン（スリ
ーボンド製 2131D）の硬化剤との3:1の割合で室温にて
混合し、脱泡を行つたもので、粘度（25℃）400CPSで可
使時間５時間、硬化後の吸水率（0.1％（煮沸１時
間）、硬化収縮率0.05％、硬度85ショアTbFeCo系記録層
スケールである。支持台の上にセンター軸を通して水平
に置かれた直径130mmの厳しい耐食性を要求されるTbFeC
o系デイスク材（４）の上に上記接着剤を半径40mmの円
周上に0.5g塗布する。これは硬化後の膜厚が20〜70μｍ
となる量である。その上から対向となるデイスク材
（４）をセンター軸を通して、一端のみをデイスク材
（４）の上にのせ、他端をゆつくりと下ろして行くこと
で気泡を混入し無いように２枚のデイスクを重ね合わせ
る。２枚のデイスクの間に介在している接着剤（５）
は、デイスク材（４）の自重でデイスク全体に広がり、
内外の周端にはみ出さずかつ塗り残しなく停止する。Example 1 A two-component epoxy adhesive is composed of a bisphenol A type epoxy resin of this type (TB2022 manufactured by ThreeBond) having a viscosity (25 ° C.) of 13000 cps and a modified aliphatic polyamine (2131D manufactured by ThreeBond) having a viscosity of 10 CPS. The mixture was degassed by mixing at a ratio of 3: 1 at room temperature, viscosity (25 ° C) 400 CPS, pot life 5 hours, water absorption after curing (0.1% (boiling 1 hour), cure shrinkage TbFeCo recording layer scale with hardness of 0.05% and hardness of 85. TbFeC with a diameter of 130 mm placed horizontally on the support base through the center axis, which requires severe corrosion resistance.
0.5 g of the above adhesive is applied on the o-type disk material (4) on the circumference of a radius of 40 mm. This has a film thickness of 20 to 70 μm after curing.
Is the amount. The opposite disc material (4) is passed through the center shaft, only one end is placed on the disc material (4), and the other end is gently lowered so that air bubbles are not mixed. Stack the disks. Adhesive (5) interposed between the two disks
Is spread over the entire disk due to the weight of the disk material (4),
Stops without protruding to the inner and outer peripheral edges and leaving no unpainted portion.
室温にて24時間放置し、硬化させた後の本発明の一実
施例の光デイスクは最大反り角0.9mrad、複屈折の最大
増加量2.1nmで、60℃90％RHに1000時間投入後、全く腐
食は発生せずC/N及びB.E.R（ビットエラーレート）も変
化せず、さらに膜の剥離テストとしては厳しい温湿度の
サイクルテスト（JIS−C5024方法Ｉ）を30サイクル終了
後も膨れは発生せず、膜の剥離等もなくC/N,B.E.R.にも
変化は無かった。The optical disc of one embodiment of the present invention after being left to stand at room temperature for 24 hours and cured has a maximum warp angle of 0.9 mrad and a maximum increase amount of birefringence of 2.1 nm, and after being put in 60 ° C. 90% RH for 1000 hours, Corrosion does not occur at all, C / N and BER (bit error rate) do not change, and swelling occurs even after 30 cycles of temperature / humidity cycle test (JIS-C5024 method I) as a film peeling test. No change and no peeling of the film and no change in C / N and BER.
実施例２ 実施例１において、ビスフェノールＡ型エポキシ樹脂
の本剤（スリーボンド製 TB2022）の代わりに、ビスフ
ェノールＦ型エポキシ樹脂の本剤（スリーボンド製 TB2
023）を用いる他は、実施例１と同様にして本発明の他
の実施例の光デイスクを得た。その光デイスクの特性を
実施例１と同様に測定したところ、実施例１と同様の特
性が得られた。Example 2 In Example 1, instead of the main agent of bisphenol A type epoxy resin (TB2022 manufactured by ThreeBond), the main agent of bisphenol F type epoxy resin (TB2 manufactured by ThreeBond) is used.
023) was used, and an optical disk of another example of the present invention was obtained in the same manner as in Example 1. When the characteristics of the optical disk were measured in the same manner as in Example 1, the same characteristics as in Example 1 were obtained.
［発明の効果］ 以上説明した通り本発明は、TbFeCo系記録層を形成し
た各透明基板の上記記録層を互いに対向させ、上記記録
層間に接着層を介在させたものにおいて、上記接着層が
ビスフェノール型エポキシ樹脂を本剤、変性脂肪族ポリ
アミンを硬化剤とする二液性エポキシ接着剤の硬化物で
形成され、吸水率が0.2％以下、硬度80〜90ショアスケ
ールであるものを用いることにより、記録膜の腐食の原
因となる水分による酸化を防止し、デイスクの変形、膨
れの発生等を防止することにより、高い信頼性が得ら
れ、かつ製品の品質向上を図れると共に貼り合わせ工程
中の不良の発生の低減が図れる光デイスクを得ることが
できる。EFFECTS OF THE INVENTION As described above, according to the present invention, in which the recording layers of the transparent substrates having the TbFeCo recording layer formed thereon are opposed to each other and the adhesive layer is interposed between the recording layers, the adhesive layer is bisphenol. Formed by a cured product of a two-part epoxy adhesive having a type epoxy resin as the main agent and a modified aliphatic polyamine as the curing agent, by using one having a water absorption rate of 0.2% or less and a hardness of 80 to 90 Shore scale, By preventing oxidation due to water, which causes corrosion of the recording film, and preventing deformation and swelling of the disk, high reliability can be obtained, product quality can be improved, and defects during the bonding process can be achieved. It is possible to obtain an optical disk that can reduce the occurrence of noise.
また、本発明の別の発明は、TbFeCo系記録層を形成し
た各透明基板の上記記録層を互いに対向させ、上記記録
層間に接着層を介在させたものにおいて、上記接着層が
ビスフェノール型エポキシ樹脂を本剤、粘度が100cps以
下の変性脂肪族ポリアミンを硬化剤とする二液性エポキ
シ接着剤の硬化物で形成され、吸水率が0.2％以下、硬
度80〜90ショアスケールであることを特徴とするものを
用いることにより、上記効果に加えてさらに高い信頼性
の得られる光デイスクを得ることができる。Further, another invention of the present invention is one in which the recording layers of each transparent substrate on which a TbFeCo recording layer is formed are opposed to each other, and an adhesive layer is interposed between the recording layers, wherein the adhesive layer is a bisphenol type epoxy resin. This product is formed from a cured product of a two-part epoxy adhesive with a modified aliphatic polyamine having a viscosity of 100 cps or less as a curing agent, and has a water absorption rate of 0.2% or less and a hardness of 80 to 90 Shore scale. In addition to the above effects, an optical disk having higher reliability can be obtained by using the optical disk.
第１図は、一般的な光デイスクの断面図、第２図は本発
明の実施例の光デイスクと従来例の光デイスクの腐食発
生率を比較する特性図、第３図は、本発明の実施例に係
わる接着剤の硬化剤粘度による光デイスクの腐食発生率
変化を示す特性図、第４図は本発明の実施例と従来の光
デイスクを比較する接着剤の硬化物の吸水率（煮沸１時
間）による光デイスクの腐食数変化を示す特性図、第５
図は本発明の実施例の光デイスクと従来例の光デイスク
を比較する、各種硬化型の接着剤を接着層に用いた光デ
イスクの最大反り角（mrad）と、貼合わせによつて増加
した複屈折（nm）の最大量を示す特性図、第６図は本発
明の実施例と従来の光デイスクを比較する、接着剤の硬
化収縮率による最大反り角（mrad）と、貼合わせによつ
て増加した複屈折（nm）の最大量変化を示す特性図、第
７図は本発明の実施例と従来の光デイスクを比較する、
各種硬化型の接着剤を用いた光デイスクの温湿度サイク
ルテスト（JIS−C5024方法Ｉ）30サイクル後のフクレ発
生数を示す特性図、第８図は本発明の実施例と従来の光
デイスクを比較する接着剤の硬化物の各硬度のものを用
いた光デイスクの温湿度サイクルテスト（JIS−C5024方
法Ｉ）30サイクル後の硬度によるフクレ発生数およびデ
イスク落下破断耐強度変化を示す特性図、第９図は本発
明の実施例と従来の光デイスクを比較する接着剤を、加
圧なしで塗布した時の接着剤の粘度による塗り残し面積
率（％）およびはみ出し周囲長（％）変化を示す特性図
である。 図において、（１）は透明基板、（２）は記録膜、
（３）は保護膜、（４）デイ スク材、（５）は接着層
である。 なお、各図中同一符号は同一または相当部分を示す。FIG. 1 is a sectional view of a general optical disk, FIG. 2 is a characteristic diagram comparing the corrosion occurrence rates of an optical disk of an embodiment of the present invention and an optical disk of a conventional example, and FIG. FIG. 4 is a characteristic diagram showing a change in corrosion occurrence rate of an optical disk according to the curing agent viscosity of an adhesive according to an example, and FIG. Characteristic diagram showing the change in the number of corrosion of optical disks due to 1 hour), No. 5
The figure compares the optical disk of the example of the present invention with the optical disk of the conventional example. The maximum warp angle (mrad) of the optical disk using various curable adhesives in the adhesive layer and the increase due to lamination are shown. FIG. 6 is a characteristic diagram showing the maximum amount of birefringence (nm), and FIG. 6 compares the embodiment of the present invention with a conventional optical disk, and shows the maximum warp angle (mrad) due to the curing shrinkage of the adhesive and the bonding. FIG. 7 is a characteristic diagram showing the maximum amount change of birefringence (nm) increased, and FIG. 7 compares the embodiment of the present invention with a conventional optical disk.
Temperature-humidity cycle test (JIS-C5024 method I) of optical discs using various curable adhesives. A characteristic diagram showing the number of blisters generated after 30 cycles. Fig. 8 shows an example of the present invention and a conventional optical disc. A temperature / humidity cycle test (JIS-C5024 method I) of an optical disc using each hardness of cured products of adhesives to be compared (JIS-C5024 method I). FIG. 9 shows changes in the uncoated area ratio (%) and the protruding peripheral length (%) depending on the viscosity of the adhesive when the adhesive for comparing the embodiment of the present invention with the conventional optical disk was applied without applying pressure. It is a characteristic view to show. In the figure, (1) is a transparent substrate, (2) is a recording film,
(3) is a protective film, (4) a disk material, and (5) is an adhesive layer. In the drawings, the same reference numerals indicate the same or corresponding parts.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 倉本 一雄 兵庫県尼崎市塚口本町８丁目１番１号 三菱電機株式会社材料研究所内 (72)発明者 土橋 勝 兵庫県尼崎市塚口本町８丁目１番１号 三菱電機株式会社産業システム研究所内 (56)参考文献 特開 昭63−176527（ＪＰ，Ａ) 特開 昭64−60834（ＪＰ，Ａ) 特開 平１−264640（ＪＰ，Ａ) 特開 平１−267856（ＪＰ，Ａ) 特開 平１−307935（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Kuramoto 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Prefecture Mitsubishi Electric Corporation Material Research Laboratory (72) Inventor Katsu Dobashi 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Prefecture No. 1 in Industrial Systems Research Center, Mitsubishi Electric Corporation (56) Reference JP 63-176527 (JP, A) JP 64-60834 (JP, A) JP 1-264640 (JP, A) JP 1-267856 (JP, A) JP-A-1-307935 (JP, A)
Claims (2)
記記録層を互いに対向させ、上記記録層間に接着層を介
在させたものにおいて、上記接着層がビスフェノール型
エポキシ樹脂を本剤、変性脂肪族ポリアミンを硬化剤と
する二液性エポキシ接着剤の硬化物で形成され、吸水率
が0.2％以下、硬度80〜90ショアスケールであることを
特徴とする光ディスク。1. A transparent substrate on which a TbFeCo-based recording layer is formed, the recording layers facing each other, and an adhesive layer interposed between the recording layers, wherein the adhesive layer is a bisphenol epoxy resin as a main component and modified. An optical disc formed of a cured product of a two-component epoxy adhesive containing an aliphatic polyamine as a curing agent, having a water absorption rate of 0.2% or less and a hardness of 80 to 90 Shore scale.
記記録層を互いに対向させ、上記記録層間に接着層を介
在させたものにおいて、上記接着層がビスフェノール型
エポキシ樹脂を本剤、粘度が100cps以下の変性脂肪族ポ
リアミンを硬化剤とする二液性エポキシ接着剤の硬化物
で形成され、吸水率が0.2％以下、硬度80〜90ショアス
ケールであることを特徴とする光ディスク。2. A transparent substrate on which a TbFeCo-based recording layer is formed, the recording layers facing each other, and an adhesive layer interposed between the recording layers, wherein the adhesive layer comprises a bisphenol type epoxy resin as a main component and a viscosity. An optical disc having a water absorption of 0.2% or less and a hardness of 80 to 90 Shore scale, which is formed of a cured product of a two-part epoxy adhesive having a modified aliphatic polyamine of 100 cps or less as a curing agent.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP90303033A EP0390413B1 (en) | 1989-03-27 | 1990-03-21 | Optical disc and method for making same |
| DE69020027T DE69020027T2 (en) | 1989-03-27 | 1990-03-21 | Optical disc and process for its manufacture. |
| EP94202146A EP0624870B1 (en) | 1989-03-27 | 1990-03-21 | Apparatus for making optical discs |
| DE69029278T DE69029278T2 (en) | 1989-03-27 | 1990-03-21 | Device for the production of optical disks |
| KR1019900004037A KR930009624B1 (en) | 1989-03-27 | 1990-03-26 | Optical disk |
| US07/906,691 US5318653A (en) | 1989-03-27 | 1992-06-30 | Optical disc and method and apparatus for making same |
| KR1019930010749A KR930009641B1 (en) | 1989-03-27 | 1993-06-14 | Producing method for optical disk |
| KR1019930010750A KR940002346B1 (en) | 1989-01-22 | 1993-06-14 | Manufacturing system of optical disk |
| US08/320,571 US5540967A (en) | 1989-03-27 | 1994-10-11 | Optical disc |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1-75731 | 1989-03-27 | ||
| JP7573189 | 1989-03-27 | ||
| JP1-277511 | 1989-10-24 | ||
| JP27751189 | 1989-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03254438A JPH03254438A (en) | 1991-11-13 |
| JP2508336B2 true JP2508336B2 (en) | 1996-06-19 |
Family
ID=26416884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012834A Expired - Fee Related JP2508336B2 (en) | 1989-01-22 | 1990-01-22 | optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2508336B2 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6460834A (en) * | 1987-09-01 | 1989-03-07 | Matsushita Electric Ind Co Ltd | Optical disk |
| JPH01264640A (en) * | 1988-04-15 | 1989-10-20 | Seiko Epson Corp | Optical recording medium |
| JPH01267856A (en) * | 1988-04-18 | 1989-10-25 | Seiko Epson Corp | Optical information recording medium |
| JPH01307935A (en) * | 1988-06-07 | 1989-12-12 | Seiko Epson Corp | Optical disk |
| JPH0227538A (en) * | 1988-07-15 | 1990-01-30 | Victor Co Of Japan Ltd | Both-face optical disk |
-
1990
- 1990-01-22 JP JP2012834A patent/JP2508336B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03254438A (en) | 1991-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |