JPS62215201A - Optical disk for information - Google Patents
Optical disk for informationInfo
- Publication number
- JPS62215201A JPS62215201A JP61058637A JP5863786A JPS62215201A JP S62215201 A JPS62215201 A JP S62215201A JP 61058637 A JP61058637 A JP 61058637A JP 5863786 A JP5863786 A JP 5863786A JP S62215201 A JPS62215201 A JP S62215201A
- Authority
- JP
- Japan
- Prior art keywords
- polybutadiene
- transparent substrate
- substrate
- crosslinked polymer
- birefringence
- 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
- 230000003287 optical effect Effects 0.000 title claims description 13
- 239000000758 substrate Substances 0.000 claims abstract description 45
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 claims abstract description 16
- 229920006037 cross link polymer Polymers 0.000 claims abstract description 9
- 230000006386 memory function Effects 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 239000005062 Polybutadiene Substances 0.000 abstract description 5
- 229920002857 polybutadiene Polymers 0.000 abstract description 5
- 239000003999 initiator Substances 0.000 abstract description 4
- 238000004132 cross linking Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000008188 pellet Substances 0.000 abstract description 2
- 150000002978 peroxides Chemical class 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract 1
- 239000004925 Acrylic resin Substances 0.000 description 6
- 229920000178 Acrylic resin Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229920005668 polycarbonate resin Polymers 0.000 description 5
- 239000004431 polycarbonate resin Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- DVQHRBFGRZHMSR-UHFFFAOYSA-N sodium methyl 2,2-dimethyl-4,6-dioxo-5-(N-prop-2-enoxy-C-propylcarbonimidoyl)cyclohexane-1-carboxylate Chemical compound [Na+].C=CCON=C(CCC)[C-]1C(=O)CC(C)(C)C(C(=O)OC)C1=O DVQHRBFGRZHMSR-UHFFFAOYSA-N 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的コ
（産業上の利用分野）
本発明は光学式情報ディスクに関し、特に透明基板の特
性を改善したものである。DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Field of Application) The present invention relates to an optical information disc, and particularly to one in which the characteristics of a transparent substrate are improved.
（従来の技術）
現在市販されているビデオディスクなど再生専用の光デ
ィスクでは、透明基板としてアクリル樹脂やポリカーボ
ネート樹脂が用いられている。(Prior Art) In playback-only optical discs such as video discs currently on the market, acrylic resin or polycarbonate resin is used as a transparent substrate.
これに対して、透明基板上に形成されたメモリ機能膜に
情報を書き込む画像ファイルなど産業用の分野で使用さ
れる光学式情報ディスクでは、透明基板に最適な材料が
確定していない。これは、産業用の光学式情報ディスク
の基板には民生品の場合よりもはるかに厳しい信頼性が
要求され、アクリル樹脂やポリカーボネート樹脂からな
る基板では要求される特性を満たすことができないため
である。On the other hand, for optical information disks used in industrial fields such as image files where information is written on a memory function film formed on a transparent substrate, the optimal material for the transparent substrate has not been determined. This is because substrates for industrial optical information disks are required to have much stricter reliability than for consumer products, and substrates made of acrylic resin or polycarbonate resin cannot meet the required characteristics. .
例えばアクリル樹脂からなる透明基板では以下のような
問題が生じる。すなわち、アクリル樹脂は耐熱性が低い
ため、基板上にメモリ機能膜を蒸着法、スパッタ法など
により形成する際、基板が変形してしまう。また、アク
リル樹脂は吸水率が大きいため、水分の付着や吸湿によ
ってメモリ機能膜を劣化させたり、基板の反りを発生さ
せたりする。後者の吸水性に対しては特別なオーバーコ
ートを施して吸湿を防止したり、サンドイッチ構造とし
て基板の反りを防止する等の対策が実施されている。し
かし、樹脂中の親水基近傍に残留している水分によって
も上記のような問題が発生し、この水分を除去すること
は極めて困難であるため、吸水性対策も完全であるとは
いえない。For example, the following problems occur with transparent substrates made of acrylic resin. That is, since acrylic resin has low heat resistance, the substrate is deformed when a memory function film is formed on the substrate by vapor deposition, sputtering, or the like. Furthermore, since acrylic resin has a high water absorption rate, adhesion or absorption of moisture can cause the memory function film to deteriorate or the substrate to warp. To address the latter problem, measures have been taken such as applying a special overcoat to prevent moisture absorption, and using a sandwich structure to prevent substrate warping. However, water remaining in the vicinity of the hydrophilic groups in the resin also causes the above-mentioned problems, and it is extremely difficult to remove this water, so measures against water absorption cannot be said to be perfect.
一方、ポリカーボネート樹脂からなる透明基板では、吸
湿が小さく基板の反りの発生が少ないものの、以下のよ
うな問題が生じる。すなわち、ポリカーボネート樹脂を
用いた場合、基板成形時に分子鎖の配向や残留応力によ
る密度分布の異方性が生じる。この異方性に起因して複
屈折が発生し、記録精度が悪くなるという問題がある。On the other hand, although transparent substrates made of polycarbonate resin have low moisture absorption and less occurrence of substrate warping, the following problems occur. That is, when polycarbonate resin is used, anisotropy in density distribution occurs due to orientation of molecular chains and residual stress during substrate molding. There is a problem in that birefringence occurs due to this anisotropy and recording accuracy deteriorates.
（発明が解決しようとする問題点）
本発明は上記問題点を解消するためになされたものであ
り、耐熱性に優れ、吸水率が小さくかつ複屈折が発生し
ない透明基板を有する、信頼性の高い光学式情報ディス
クを提供することを目的とする。(Problems to be Solved by the Invention) The present invention has been made to solve the above-mentioned problems, and is a reliable, transparent substrate with excellent heat resistance, low water absorption, and no birefringence. The purpose is to provide high quality optical information discs.
［発明の構成］
（問題点を解決するための手段）
本発明の光学式情報ディスクは、透明基板と該基板上に
形成されたメモリ機能膜とを有する光学式情報ディスク
において、前記透明基板として１．２−ポリブタジエン
の架橋重合体を用いたことを特徴とするものである。[Structure of the Invention] (Means for Solving the Problems) An optical information disc of the present invention includes a transparent substrate and a memory function film formed on the substrate, wherein the transparent substrate is a memory function film formed on the substrate. It is characterized by using a crosslinked polymer of 1.2-polybutadiene.
る透明基板は、耐熱性に優れているので、メモリ機能膜
を形成する際に変形が起りにくい。また、吸水性が小さ
いため、メモリ機能膜を劣化させたり、基板自体に反り
が発生することがない。また、ベンゼン核やハロゲン等
を含有していないため、分子の配向が少なく、複屈折も
事実上問題にならない。したがって、光学式情報ディス
クの信頼性を著しく向上することができる。The transparent substrate has excellent heat resistance, so it is less likely to be deformed when forming the memory function film. Furthermore, since water absorption is small, the memory function film is not deteriorated and the substrate itself is not warped. Furthermore, since it does not contain benzene nuclei or halogens, there is little molecular orientation and birefringence is virtually no problem. Therefore, the reliability of the optical information disc can be significantly improved.
なお、本発明の光学式情報ディスクは以下のようにして
製造される。まず、透明基板の原料となる１、２−ポリ
ブタジエンとしては、シンジオタフティック１．２−ポ
リブタジエンのベレット状のもの、アタックティック１
．２−ポリブタジエンの液状のものあるいは末端が変成
された１、２−ボリブタジエンの液状のもの等を挙げる
ことができる。また、１．２−ポリブタジエンを硬化さ
せるための架橋開始剤としては、硬化時に着色の少ない
過酸化物等のラジカル発生剤が望ましい。Note that the optical information disc of the present invention is manufactured as follows. First, the 1,2-polybutadiene used as the raw material for the transparent substrate is syndiotaftic 1,2-polybutadiene in the form of a pellet, attacktic 1,
．． Examples include liquid 2-polybutadiene and terminally modified 1,2-volibutadiene. Moreover, as a crosslinking initiator for curing 1,2-polybutadiene, a radical generator such as a peroxide that causes little coloring during curing is desirable.
上記のような１．２−ポリブタジエンと架１開始剤とを
通常のプラスチック成形法により成形して１．２−ポリ
ブタジエン架橋重合体からなる透明基板を作製する。成
形法としては、圧縮成形、射出成形、トランスファ成形
、２Ｐ＠（Ｐｈｏｔ。A transparent substrate made of a crosslinked 1,2-polybutadiene polymer is prepared by molding the above-mentioned 1,2-polybutadiene and a bridge 1 initiator using a conventional plastic molding method. Molding methods include compression molding, injection molding, transfer molding, and 2P@(Photo.
ＰＯＩｙｍｅｒｉＺａｔ＋Ｏｎ ＞等を挙げることがで
きるが、２Ｐ法ではポリマーの厚みの影響で硬化度合が
不均一になるおそれがあるので、成形金型を用いる方法
が望ましい。成形温度は低い方が望ましく、通常は１３
０〜１８０℃のＶ！囲で実施する。POIymeriZat+On > etc. However, in the 2P method, the degree of curing may be uneven due to the influence of the thickness of the polymer, so a method using a mold is preferable. It is desirable that the molding temperature is lower, usually 13
V from 0 to 180℃! Implemented within the surrounding area.
上記のようにして作製された１、２−ポリブタジエン架
橋重合体からなる透明基板の表面には、メモリ機能膜が
コートされ、更にへβ等の反射膜及びＳ ｉ ０２等の
保護膜がスパッタリング等の方法で形成される。なお、
基板には必要に応じて案内溝が設けられる。The surface of the transparent substrate made of the 1,2-polybutadiene crosslinked polymer produced as described above is coated with a memory function film, and a reflective film such as Heβ and a protective film such as S i 02 are further coated by sputtering or the like. It is formed by the following method. In addition,
Guide grooves are provided in the substrate as necessary.
（実施例）
以下のような１．２−ポリブタジエン及び架橋開始剤を
用い、１５０℃、４０分の硬化条件で圧縮成形を行ない
、１．２−ポリブタジエン架橋重合体からなる透明基板
を作製した。(Example) Using 1,2-polybutadiene and a crosslinking initiator as shown below, compression molding was performed under curing conditions of 150° C. for 40 minutes to produce a transparent substrate made of a 1,2-polybutadiene crosslinked polymer.
実施例１
１．２−ポリブタジエン（ＪＳＲＲＤ８０５、日本合成
ゴム製） １００重量部
ジクミルパーオキサイド ３重酋部
実施例２
１．２−ポリブタジエン（Ｂ−２０００、日本曹達製）
１００重量部
ジクミルパーオキサイド ３重量部
比較例１としてアクリル樹脂、比較例２としてポリカー
ボネート樹脂をそれぞれ射出成形して透明基板を作製し
た。Example 1 1.2-Polybutadiene (JSRRD805, manufactured by Nippon Soda Rubber Co., Ltd.) 100 parts by weight dicumyl peroxide Triple layer Example 2 1.2-Polybutadiene (B-2000, manufactured by Nippon Soda Co., Ltd.)
100 parts by weight dicumyl peroxide 3 parts by weight Transparent substrates were prepared by injection molding an acrylic resin as Comparative Example 1 and a polycarbonate resin as Comparative Example 2.
得られた実施例１．２及び比較例１．２の各透明基板に
ついて、それぞれ表面硬度、光透過率、吸水率及び耐熱
性を調べた。その結果を下記表に示す。The surface hardness, light transmittance, water absorption, and heat resistance of each of the obtained transparent substrates of Example 1.2 and Comparative Example 1.2 were examined. The results are shown in the table below.
なお、表面硬度はロックウェルＭにより測定した。光透
過率は紫外可視分光器を用い、可視光を透過させて測定
した。吸水率は各透明基板を常温で水中に２４時間浸漬
し、付着した水を拭きとった後に測定した。また、耐熱
性は熱変形温度を示す。Note that the surface hardness was measured by Rockwell M. The light transmittance was measured using an ultraviolet-visible spectrometer by transmitting visible light. The water absorption rate was measured after immersing each transparent substrate in water at room temperature for 24 hours and wiping off the adhering water. Moreover, heat resistance indicates the heat distortion temperature.
上記表から明らかなように、実施例１．２の透明基板は
、表面硬度及び光透過率については従来のものと同等あ
るいは若干優れている程度であるが、吸水率が従来のも
のよりも格段に小さくなり、耐熱性も従来のものよりも
かなり向上している。As is clear from the table above, the transparent substrate of Example 1.2 has surface hardness and light transmittance that are equivalent to or slightly superior to conventional substrates, but its water absorption rate is significantly higher than that of conventional substrates. It is smaller in size, and its heat resistance is significantly improved compared to conventional ones.
したがって、１．２−ポリブタジエン架橋重合体からな
る透明基板を用いた光学式情報ディスクは、メモリ機能
膜を形成する際の変形が起りにくく、水分の吸収による
メモリ機能膜の劣化や基板自体の反りを防止することが
でき、しかも複屈折も事実上問題にならないので、信頼
性が著しく向上する。Therefore, optical information disks using transparent substrates made of 1,2-polybutadiene crosslinked polymers are less susceptible to deformation during the formation of the memory function film, resulting in deterioration of the memory function film due to moisture absorption and warping of the substrate itself. Since birefringence can be prevented and birefringence is virtually no problem, reliability is significantly improved.
［発明の効果］
以上詳述した如く本発明によれば、透明基板自体の変形
やメモリ機能膜の劣化等を防止でき、透明基板の複屈折
も問題にならないので、産業用として高い信頼性を有す
る光学式情報ディスクを提供できるものである。[Effects of the Invention] As detailed above, according to the present invention, deformation of the transparent substrate itself and deterioration of the memory function film can be prevented, and birefringence of the transparent substrate does not become a problem, so that high reliability can be achieved for industrial use. It is possible to provide an optical information disc having the following features.
Claims (2)
を有する光学式情報ディスクにおいて、前記基板として
１、２−ポリブタジエンの架橋重合体を用いたことを特
徴とする光学式情報ディスク。(1) An optical information disc comprising a transparent substrate and a memory function film formed on the substrate, characterized in that a crosslinked polymer of 1,2-polybutadiene is used as the substrate.
板に案内溝を設けたことを特徴とする特許請求の範囲第
１項記載の光学式情報ディスク。(2) The optical information disc according to claim 1, characterized in that a guide groove is provided on a substrate made of a crosslinked polymer of 1,2-polybutadiene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61058637A JPS62215201A (en) | 1986-03-17 | 1986-03-17 | Optical disk for information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61058637A JPS62215201A (en) | 1986-03-17 | 1986-03-17 | Optical disk for information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62215201A true JPS62215201A (en) | 1987-09-21 |
Family
ID=13090096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61058637A Pending JPS62215201A (en) | 1986-03-17 | 1986-03-17 | Optical disk for information |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62215201A (en) |
-
1986
- 1986-03-17 JP JP61058637A patent/JPS62215201A/en active Pending
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