JPH07169092A - Information recording medium and polycarbonate resin for information recording medium - Google Patents
Information recording medium and polycarbonate resin for information recording mediumInfo
- Publication number
- JPH07169092A JPH07169092A JP5313201A JP31320193A JPH07169092A JP H07169092 A JPH07169092 A JP H07169092A JP 5313201 A JP5313201 A JP 5313201A JP 31320193 A JP31320193 A JP 31320193A JP H07169092 A JPH07169092 A JP H07169092A
- Authority
- JP
- Japan
- Prior art keywords
- information recording
- recording medium
- polycarbonate resin
- substrate
- release agent
- 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
- 229920005668 polycarbonate resin Polymers 0.000 title claims abstract description 24
- 239000004431 polycarbonate resin Substances 0.000 title claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 12
- 229930195729 fatty acid Natural products 0.000 claims abstract description 12
- 239000000194 fatty acid Substances 0.000 claims abstract description 12
- -1 fatty acid ester Chemical class 0.000 claims abstract description 10
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 6
- 230000007062 hydrolysis Effects 0.000 abstract description 5
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 5
- VBICKXHEKHSIBG-UHFFFAOYSA-N beta-monoglyceryl stearate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 5
- DMBUODUULYCPAK-UHFFFAOYSA-N 1,3-bis(docosanoyloxy)propan-2-yl docosanoate Chemical compound CCCCCCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCCCCCC DMBUODUULYCPAK-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- QHZLMUACJMDIAE-UHFFFAOYSA-N Palmitic acid monoglyceride Natural products CCCCCCCCCCCCCCCC(=O)OCC(O)CO QHZLMUACJMDIAE-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002356 laser light scattering Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Polyesters Or Polycarbonates (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
(57)【要約】
【目的】 良好な離型性を確保すると共にポリカーボネ
ート樹脂の加水分解を抑制し、これによって高い耐候性
を有する基板を備えた情報記録媒体を提供すること。か
かる特性をもつ情報記録媒体の基板が得られるポリカー
ボネート樹脂を提供すること。
【構成】 炭素数が１０〜３０の脂肪酸エステル（例え
ば、ステアリン酸モノグリセリド）を含有し、ｐＨが７
以下を示す離型剤を０．５％以下含有するポリカーボネ
ート樹脂。該ポリカーボネート樹脂を用いて成形した基
板を有する情報記録媒体。離型剤が示すｐＨとしては、
４．０〜６．５の範囲にあることが好ましい。(57) [Summary] [Object] To provide an information recording medium provided with a substrate having good weatherability and suppressing hydrolysis of a polycarbonate resin, thereby having high weather resistance. To provide a polycarbonate resin capable of obtaining a substrate of an information recording medium having such characteristics. [Structure] Contains a fatty acid ester having 10 to 30 carbon atoms (eg, stearic acid monoglyceride) and has a pH of 7
A polycarbonate resin containing 0.5% or less of a release agent shown below. An information recording medium having a substrate molded using the polycarbonate resin. The pH of the release agent is
It is preferably in the range of 4.0 to 6.5.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光または光と磁気とを
用いて情報の記録、再生または消去が行われる、レーザ
ーディスク、コンパクトディスク、Ｗｒｉｔｅ−Ｏｎｃ
ｅ型ディスク、光磁気ディスク、ミニディスク、光カー
ド等の情報記録媒体およびその基板に用いられるポリカ
ーボネート樹脂に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser disc, a compact disc, and a write-onc in which information is recorded, reproduced or erased using light or light and magnetism.
The present invention relates to a polycarbonate resin used for an information recording medium such as an e-type disc, a magneto-optical disc, a mini disc, an optical card, and the substrate thereof.
【０００２】[0002]
【従来の技術】コンパクトディスク、光磁気ディスク等
に代表される光ディスクや光カードは、アクリル樹脂、
ポリカーボネート樹脂等からなる基板の信号側表面（信
号が書き込まれた面）に、スパッタリング法、真空蒸着
法などの薄膜形成法を用いて金属薄膜が設けられてなる
ものであり、最近では、ポリカーボネート樹脂の射出成
形体からなる基板を用いるのが一般的である。2. Description of the Related Art Optical discs and optical cards typified by compact discs and magneto-optical discs are made of acrylic resin,
A metal thin film is provided on a signal side surface (a surface on which a signal is written) of a substrate made of a polycarbonate resin or the like by using a thin film forming method such as a sputtering method or a vacuum vapor deposition method. It is common to use a substrate made of an injection-molded article.
【０００３】しかしながら、ポリカーボネート樹脂から
なる基板を射出成形する場合、金型との離型不良によっ
て、成形された基板に反り、転写不良等による不良品が
発生することがある。そこで、ポリカーボネート樹脂に
シリコーンオイル、脂肪酸、脂肪酸エステル等の離型剤
を添加することが多い。However, when a substrate made of a polycarbonate resin is injection-molded, the molded substrate may be warped due to defective release from the mold, and a defective product may occur due to defective transfer. Therefore, a releasing agent such as silicone oil, fatty acid or fatty acid ester is often added to the polycarbonate resin.
【０００４】[0004]
【発明が解決しようとする課題】情報記録媒体用ポリカ
ーボネートに添加する離型剤としてシリコーンオイルを
用いた場合、高い効果を得るためには多量のシリコーン
オイルを添加する必要があり、しみだしたオイルによっ
て、基板と金属薄膜との密着性に悪影響を与える。ま
た、脂肪酸、脂肪酸エステルを用いた場合、高温高湿下
においてポリカーボネート樹脂の加水分解を引き起こ
し、加水分解による分解物（白色の点として析出す
る。）によってレーザ光の散乱等が発生し、信号特性が
低下することがある。When silicone oil is used as a release agent to be added to polycarbonate for information recording media, it is necessary to add a large amount of silicone oil in order to obtain a high effect. This adversely affects the adhesion between the substrate and the metal thin film. When a fatty acid or a fatty acid ester is used, the polycarbonate resin is hydrolyzed under high temperature and high humidity, and a laser light scattering or the like occurs due to a hydrolyzed decomposition product (precipitated as a white dot), which results in signal characteristics. May decrease.
【０００５】本発明は、上記課題に鑑みてなされたもの
で、良好な離型性を確保しつつ、ポリカーボネート樹脂
の加水分解を抑制し、これによって高い耐候性を有する
基板を備えた情報記録媒体を提供すること、および、か
かる特性をもつ情報記録媒体の基板が得られるポリカー
ボネート樹脂を提供することを目的とする。The present invention has been made in view of the above problems, and suppresses hydrolysis of the polycarbonate resin while ensuring good mold release properties, thereby providing an information recording medium having a substrate having high weather resistance. And a polycarbonate resin from which a substrate of an information recording medium having such characteristics can be obtained.
【０００６】[0006]
【課題を解決するための手段】本願の請求項１の情報記
録媒体の発明は、炭素数が１０〜３０の脂肪酸エステル
を含有し、ｐＨが７以下を示す離型剤を０．５％以下含
有するポリカーボネート樹脂を用いて成形してなる基板
を有することを特徴とする。The invention of the information recording medium according to claim 1 of the present application is 0.5% or less of a release agent containing a fatty acid ester having 10 to 30 carbon atoms and having a pH of 7 or less. It has a substrate formed by using the contained polycarbonate resin.
【０００７】また、本願の請求項２の情報記録媒体用ポ
リカーボネート樹脂の発明は、炭素数が１０〜３０の脂
肪酸エステルを含有し、ｐＨが７以下を示す離型剤を
０．５％以下含有することを特徴とする。The invention of the polycarbonate resin for an information recording medium according to claim 2 of the present application contains 0.5% or less of a release agent containing a fatty acid ester having 10 to 30 carbon atoms and having a pH of 7 or less. It is characterized by doing.
【０００８】本発明における離型剤は炭素数が１０〜３
０の脂肪酸エステルが９０％以上の割合で含まれている
ものが好ましい。上記の脂肪酸エステルとしては、ステ
アリン酸モノグリセリド、ベヘン酸モノグリセリド、パ
ルミチン酸モノグリセリド等が挙げられる。離型剤が示
すｐＨとしては、４．０〜６．５の範囲にあることが好
ましい。ここで、本発明におけるｐＨ値は、離型剤５ｇ
を塩化メチレンに溶解した後、１００ｍｌの超純水を添
加、混合し、１昼夜静かに放置した後、水層のみを単離
し、ｐＨメーターで測定した値である。離型剤の含有量
としては、０．０３〜０．１％の範囲にあることが好ま
しい。なお、本発明で用いられるポリカーボネート樹脂
としては、透明性が高く、高い射出成形性を有するもの
であって、一般に情報記録媒体用として用いられるもの
であれば特に限定されない。The release agent used in the present invention has 10 to 3 carbon atoms.
Those containing 0 fatty acid ester in a proportion of 90% or more are preferable. Examples of the above-mentioned fatty acid ester include stearic acid monoglyceride, behenic acid monoglyceride, palmitic acid monoglyceride and the like. The pH exhibited by the release agent is preferably in the range of 4.0 to 6.5. Here, the pH value in the present invention is 5 g of the release agent.
Was dissolved in methylene chloride, 100 ml of ultrapure water was added and mixed, and the mixture was allowed to stand for a whole day and night, then only the aqueous layer was isolated and measured with a pH meter. The content of the release agent is preferably in the range of 0.03 to 0.1%. The polycarbonate resin used in the present invention is not particularly limited as long as it has high transparency and high injection moldability and is generally used for information recording media.
【０００９】[0009]
【実施例】以下、実施例により本発明を具体的に説明す
る。 （実施例１〜６）脂肪酸エステルとして、ステアリン酸
モノグリセリド（実施例１〜４）、ベヘン酸モノグリセ
リド（実施例５）およびパルミチン酸モノグリセリド
（実施例６）をそれぞれ用い、表１に示す量の離型剤を
それぞれ含有させたポリカーボネート樹脂を用いて、射
出成形法により直径２．５インチ、厚さ１．２ｍｍの情
報記録媒体用基板を成形した（成形時の温度：３４０
℃）。各実施例における離型剤のｐＨをあわせて表１に
示す。EXAMPLES The present invention will be specifically described below with reference to examples. (Examples 1 to 6) As fatty acid esters, stearic acid monoglyceride (Examples 1 to 4), behenic acid monoglyceride (Example 5) and palmitic acid monoglyceride (Example 6) were used, and the amounts of separation shown in Table 1 were used. A substrate for information recording medium having a diameter of 2.5 inches and a thickness of 1.2 mm was molded by injection molding using a polycarbonate resin containing each mold agent (temperature at the time of molding: 340
C). The pH of the release agent in each example is also shown in Table 1.
【００１０】各実施例で得られた基板を温度１３０℃、
湿度２．５ｋｇｆ／ｃｍ2の環境下に２．５時間放置
し、ポリカーボネート樹脂の加水分解による分解物の数
（白色の点として析出したものの数を目視でカウントし
た。）を調べた。その結果を表１に示す。The substrate obtained in each example was heated at a temperature of 130 ° C.
The sample was allowed to stand for 2.5 hours in an environment of a humidity of 2.5 kgf / cm 2, and the number of decomposed products due to hydrolysis of the polycarbonate resin (the number of those precipitated as white dots was visually counted) was examined. The results are shown in Table 1.
【００１１】[0011]
【表１】 [Table 1]
【００１２】（比較例１〜３）表１に示すｐＨのステア
リン酸モノグリセリドを含有する離型剤を表１に示す量
だけ含有させたポリカーボネート樹脂を用いて、実施例
１〜６におけると同じ条件で情報記録媒体用基板を成形
した。得られた基板について各実施例と同じ方法でポリ
カーボネート樹脂の加水分解による分解物の数を調べ
た。その結果を表１にあわせて示す。(Comparative Examples 1 to 3) Polycarbonate resins containing a stearic acid monoglyceride having a pH shown in Table 1 in an amount shown in Table 1 were used under the same conditions as in Examples 1 to 6. The information recording medium substrate was molded with. The number of decomposition products of the obtained substrate due to hydrolysis of the polycarbonate resin was examined by the same method as in each example. The results are also shown in Table 1.
【００１３】表１により、ｐＨが７以下を示す離型剤を
０．５％以下含有するポリカーボネート樹脂を用いて成
形した基板では、当該加水分解物の数が少ないことが明
らかである。なお、上記各実施例において離型性は良好
で、離型不良による転写ずれ等は発生しなかった。From Table 1, it is clear that the number of the hydrolyzed products is small in the substrate formed by using the polycarbonate resin containing 0.5% or less of the release agent having the pH of 7 or less. In each of the above-described examples, the releasability was good, and the transfer deviation or the like due to the poor releasability did not occur.
【００１４】本発明により得られた基板は、反射膜、記
録膜、磁性膜等が積層され、コンパクトディスク、光磁
気ディスクなどの光ディスク、光カード等に利用され
る。The substrate obtained by the present invention is laminated with a reflection film, a recording film, a magnetic film and the like, and is used for an optical disk such as a compact disk and a magneto-optical disk, an optical card and the like.
【００１５】[0015]
【発明の効果】本発明によれば、ポリカーボネート樹脂
の加水分解が抑制されることから、基板が高い耐候性を
有しており、信頼性の高い情報記録媒体が得られる。ま
た、かかる特性をもつ情報記録媒体の基板を成形可能な
ポリカーボネート樹脂が得られる。According to the present invention, since the hydrolysis of the polycarbonate resin is suppressed, the substrate has high weather resistance and a highly reliable information recording medium can be obtained. Further, a polycarbonate resin capable of molding a substrate of an information recording medium having such characteristics can be obtained.
Claims (2)
含有し、ｐＨが７以下を示す離型剤を０．５％以下含有
するポリカーボネート樹脂を用いて成形してなる基板を
有することを特徴とする情報記録媒体。1. A substrate formed by using a polycarbonate resin containing a fatty acid ester having 10 to 30 carbon atoms and 0.5% or less of a release agent having a pH of 7 or less. And an information recording medium.
含有し、ｐＨが７以下を示す離型剤を０．５％以下含有
することを特徴とする情報記録媒体用ポリカーボネート
樹脂。2. A polycarbonate resin for an information recording medium, which contains a fatty acid ester having 10 to 30 carbon atoms and 0.5% or less of a release agent having a pH of 7 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5313201A JPH07169092A (en) | 1993-12-14 | 1993-12-14 | Information recording medium and polycarbonate resin for information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5313201A JPH07169092A (en) | 1993-12-14 | 1993-12-14 | Information recording medium and polycarbonate resin for information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07169092A true JPH07169092A (en) | 1995-07-04 |
Family
ID=18038327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5313201A Pending JPH07169092A (en) | 1993-12-14 | 1993-12-14 | Information recording medium and polycarbonate resin for information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07169092A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7307114B2 (en) | 2003-05-07 | 2007-12-11 | Asahi Kasei Chemicals Corporation | Polycarbonate resin composition for use in the production of a substrate for an optical information medium |
-
1993
- 1993-12-14 JP JP5313201A patent/JPH07169092A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7307114B2 (en) | 2003-05-07 | 2007-12-11 | Asahi Kasei Chemicals Corporation | Polycarbonate resin composition for use in the production of a substrate for an optical information medium |
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