JP2000011448A - Degradable optical recording media - Google Patents
Degradable optical recording mediaInfo
- Publication number
- JP2000011448A JP2000011448A JP10181710A JP18171098A JP2000011448A JP 2000011448 A JP2000011448 A JP 2000011448A JP 10181710 A JP10181710 A JP 10181710A JP 18171098 A JP18171098 A JP 18171098A JP 2000011448 A JP2000011448 A JP 2000011448A
- Authority
- JP
- Japan
- Prior art keywords
- optical recording
- degradable
- recording medium
- resin
- plastic material
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2539—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins biodegradable polymers, e.g. cellulose
Landscapes
- Biological Depolymerization Polymers (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
(57)【要約】
【課題】 従来、光ディスク等の光記録媒体において
は、その基材にポリカーボネートを使用しているものが
多く、使用後の廃棄に際して、焼却及び埋め立ての何れ
の処理においても様々な公害の発生の危険性があった。
本発明は、光記録媒体の廃棄処理に際して、できるだけ
公害の発生を及ぼさない生分解性光記録媒体を提供する
ものである
【解決手段】 基材に光記録層を有する光記録媒体にお
いて、光記録媒体を構成する基材が自然界において分解
可能な分解性プラスチック材料からなることを特徴とす
るもので、特に前記分解性プラスチック材料が微生物に
より分解されることができる生分解性樹脂からなるもの
である。
(57) [Problem] Conventionally, in many optical recording media such as optical discs, polycarbonate is used as a base material thereof. There was a danger of the occurrence of serious pollution.
An object of the present invention is to provide a biodegradable optical recording medium which does not cause pollution as much as possible when discarding the optical recording medium. The base material constituting the medium is characterized by being composed of a degradable plastic material that can be degraded in nature, and in particular, the degradable plastic material is composed of a biodegradable resin that can be degraded by microorganisms. .
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば光ディス
ク、コンパクトディスク等の光記録層を有する光記録媒
体に関し、特にこれらの光記録媒体の基材に自然界にお
いて分解可能な基材を用いることで、廃棄した際の自然
環境の破壊防止と無公害化の促進を図るようにしたもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium having an optical recording layer, such as an optical disk and a compact disk, and more particularly, to the use of a base material which can be decomposed in nature as a base material of these optical recording media. It is designed to prevent the destruction of the natural environment and promote pollution-free disposal.
【０００２】[0002]
【従来の技術】近年、光ディスク、コンパクトディスク
等の光記録層を有する光記録媒体が様々な分野や業界で
採用されている。これらの光記録媒体は、例えばコンパ
クトディスク（ＣＤ）のようにその基材の材質にポリカ
ーボネートを用いているものが多く、使用後の処理に関
しては、従来、焼却ないし埋め立て等に頼らざるを得え
ないため、プラスチック廃棄物処理について現在大きな
社会問題としてクローズアップされている。すなわち、
焼却処理では、プラスチック廃棄物の大きな燃焼エネル
ギーに耐えうる耐高熱炉が必要になるので、処理コスト
が高いものとなるのみならず、プラスチックを大量に焼
却すると、排気ガスに、一酸化炭素やイオウ化合物等の
大気汚染物質が発生して大気汚染等の環境破壊につなが
るおそれがある。2. Description of the Related Art In recent years, optical recording media having an optical recording layer, such as optical disks and compact disks, have been adopted in various fields and industries. Many of these optical recording media use polycarbonate as a material of the base material, for example, a compact disk (CD). For the treatment after use, conventionally, it has to rely on incineration or landfill. Because of this, plastic waste treatment is currently being highlighted as a major social issue. That is,
The incineration process requires a high-heat furnace that can withstand the large combustion energy of plastic waste, which not only increases the disposal cost, but also incinerates a large amount of plastics into carbon monoxide and sulfur. Air pollutants such as compounds may be generated and lead to environmental destruction such as air pollution.
【０００３】また、埋め立て処理では、プラスチック材
料は分解されることなくほぼ永久的に残り、廃棄物とし
て処分場に堆積することになりゴミ問題として社会問題
化している。しかもプラスチック材料はそのままの形態
で地中に存在するため、埋め立て地の地盤が安定しない
という問題や、プラスチック材料を埋め立てた土地や地
域における自然界の各種の生物に対しても、悪影響を及
ぼす危険性がある。[0003] In the landfill treatment, the plastic material remains almost permanently without being decomposed, and is deposited as waste at the disposal site, which is a social problem as a garbage problem. Moreover, since plastic materials exist in the ground in their original form, there is a risk that the land of the landfill will not be stable, and that it will have an adverse effect on various natural creatures in the land and areas where the plastic material is landfilled. There is.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記のよう
な従来の光ディスク、コンパクトディスク等の光記録層
を有する光記録媒体の廃棄に際して、様々な公害の発生
を防止あるいは低減するためになされたもので、使用済
の光記録媒体を自然界に廃棄しても従来の光記録媒体よ
りも公害の発生を抑制して、廃棄処理を行うことのでき
る光記録媒体を提供するものである。SUMMARY OF THE INVENTION The present invention has been made to prevent or reduce the occurrence of various types of pollution when discarding an optical recording medium having an optical recording layer, such as the above-mentioned conventional optical disk or compact disk. An object of the present invention is to provide an optical recording medium capable of performing disposal processing while suppressing the occurrence of pollution as compared with a conventional optical recording medium even if a used optical recording medium is discarded in the natural world.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明による分解性光記録媒体は、基材に光記録
層を有する光記録媒体において、光記録媒体を構成する
基材が自然界において分解可能な分解性プラスチック材
料からなることを特徴とするものである。Means for Solving the Problems To achieve the above object, a degradable optical recording medium according to the present invention is an optical recording medium having an optical recording layer on a substrate, wherein the substrate constituting the optical recording medium is It is characterized by being made of a degradable plastic material that can be decomposed in nature.
【０００６】また、前記分解性プラスチック材料が微生
物により分解可能な生分解性樹脂からなることを特徴と
する分解性光記録媒体である。Further, there is provided a degradable optical recording medium, wherein the degradable plastic material comprises a biodegradable resin which can be degraded by microorganisms.
【０００７】そして、前記光記録媒体が光ディスク、コ
ンパクトディスクであることを特徴とする分解性光記録
媒体である。[0007] The optical recording medium is an optical disk or a compact disk.
【０００８】[0008]
【発明の実施の形態】本発明の分解性光記録媒体は、基
材部分とその基材表面に形成された光記録層とから構成
されている光記録媒体であり、しかも基材部分をプラス
チック材料から構成することが可能な光記録媒体であれ
ば、その基材部分のプラスチック材料の材質を分解性プ
ラスチック材料、特に微生物により分解可能な生分解性
樹脂により形成することにより、様々な仕様の光記録媒
体に適応することができるものである。基材表面に形成
された光記録層には、従来のように光反射率が高く安価
なアルミ薄等を用いるが、基材を構成するシートには、
自然界において分解可能な分解性プラスチック材料から
なる基材をシートとして用いているものである。 ま
た、保護層にも、分解性プラスチック材料、特に微生物
により分解可能な生分解性樹脂を用いることがより効果
的である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The degradable optical recording medium of the present invention is an optical recording medium comprising a base portion and an optical recording layer formed on the surface of the base material. In the case of an optical recording medium that can be composed of a material, the material of the plastic material of the base portion is made of a degradable plastic material, particularly a biodegradable resin that can be degraded by microorganisms, so that various specifications can be obtained. It can be applied to an optical recording medium. For the optical recording layer formed on the surface of the base material, use is made of a thin aluminum sheet or the like, which has a high light reflectance and is inexpensive as in the past,
A sheet made of a substrate made of a decomposable plastic material that can be decomposed in nature is used. It is more effective to use a degradable plastic material, particularly a biodegradable resin that can be degraded by microorganisms, for the protective layer.
【０００９】上記の分解可能な分解性プラスチック材料
としては、分解性ポリエチレン樹脂や分解性ポリプロピ
レン等のポリオレフィン樹脂、ポリビニルアルコールま
たは分解性ポリエステル等で形成され、光や微生物によ
り分解され得る樹脂である。The degradable decomposable plastic material is a resin formed of polyolefin resin such as degradable polyethylene resin or degradable polypropylene, polyvinyl alcohol or degradable polyester and decomposed by light or microorganism.
【００１０】上記した自然界において分解可能な分解性
プラスチック材料の内、微生物分解性（又は生分解性）
のものとして市販されているものは、例えば、ＩＣＩ社
の熱可塑性ポリエステル，商品名「Ｂｉｏｐｏｌ」、Ｎ
ｏｖａｍｏａｔ社のデンプン／変形ＰＶＡ系，商品名
「Ｍａｔｅｒ−Ｂｉ」、ワーナーランバート社のデンプ
ン／変形ＰＶＡ系，商品名「Ｎｏｖｏｎ」、島津製作所
社の乳酸系，商品名「ラクティー」、三井東圧工業社の
乳酸系，商品名「レイシア」、ＵＣＣ社のポリカプロラ
クタン、日本ポリオレフィン社のジカルボン酸／ジオー
ル系，商品名「ビオノーレ」等がある。[0010] Among the degradable plastic materials that can be degraded in nature, microbial decomposability (or biodegradability)
Commercially available products include, for example, thermoplastic polyester manufactured by ICI, trade name "Biopol", N
Ovamoat's starch / modified PVA system, trade name "Mater-Bi", Warner Lambert's starch / modified PVA system, trade name "Novon", Shimadzu Corporation lactic acid base, trade name "Lacty", Mitsui Toatsu Kogyo Lactic acid, trade name "Lacia", UCC polycaprolactan, Japan Polyolefin dicarboxylic acid / diol, trade name "Bionole".
【００１１】分解性樹脂のうち、光分解性のものとして
は、エチレンと一酸化炭素との共重合体等が挙げられ
る。このエチレン−一酸化炭素共重合体は、カルボニル
基に結合する２番目と３番目の炭素間が光で開裂するこ
とにより分解すると言われている。そして、分解速度は
共重合体中の一酸化炭素の含有量により調節することが
できる。通常、エチレン−一酸化炭素共重合体の密度
は、０．８９〜０．９５ｇ／ｃｍ3 程度であり、一酸化
炭素の含有量は、０．１〜１０モル％程度である。上述
のようなエチレン−一酸化炭素共重合体は、例えばエチ
レンと一酸化炭素とを温度２３０℃、圧力２０００気圧
程度の条件下で共存させることにより製造することがで
きる。Among the decomposable resins, the photodecomposable resins include copolymers of ethylene and carbon monoxide. It is said that this ethylene-carbon monoxide copolymer is decomposed by cleavage between light at the second and third carbon atoms bonded to the carbonyl group. And the decomposition rate can be adjusted by the content of carbon monoxide in the copolymer. Usually, the density of the ethylene-carbon monoxide copolymer is about 0.89 to 0.95 g / cm 3 , and the content of carbon monoxide is about 0.1 to 10 mol%. The ethylene-carbon monoxide copolymer as described above can be produced, for example, by allowing ethylene and carbon monoxide to coexist at a temperature of 230 ° C. and a pressure of about 2000 atm.
【００１２】また、光分解性の分解性ポリオレフィン樹
脂として、ポリエチレン（密度０．８７０〜０．９５０
ｇ／ｃｍ3 、溶融指数（ＭＦＩ）０．４〜４０）やポリ
プロピレン（密度０．８８〜０．９１ｇ／ｃｍ3 、溶融
指数（ＭＦＩ）０．２〜５０）と有機酸金属塩との混合
物を用いることもできる。有機酸金属塩としては、ステ
アリン酸鉄、ステアリン酸セリウム、ステアリン酸コバ
ルト等があり、酸化鉄等の金属酸化物等が挙げられ、有
機酸金属塩の混合量は１〜５０００ｐｐｍ程度が好まし
い。また、ビニルケトンとの共重合体を添加することも
ある。これらの分解性樹脂は、単体で用いても、２種以
上を混合してもよく、強度、分解性等の必要な特性に応
じて適宜選択することができる。As the photodegradable decomposable polyolefin resin, polyethylene (density: 0.870 to 0.950) is used.
g / cm 3, melt index (MFI) 0.4 to 40) and polypropylene (density 0.88~0.91g / cm 3, melt index (MFI) mixture of 0.2 to 50) and an organic acid metal salt Can also be used. Examples of the organic acid metal salt include iron stearate, cerium stearate, cobalt stearate, and the like, and metal oxides such as iron oxide and the like. The mixing amount of the organic acid metal salt is preferably about 1 to 5000 ppm. Further, a copolymer with vinyl ketone may be added. These degradable resins may be used alone or as a mixture of two or more, and may be appropriately selected according to the required properties such as strength and degradability.
【００１３】また、生分解性ポリオレフィン樹脂に用い
られるポリカプロラクタンは、ε−カプロラクタンの開
環重合により得られ、その重合平均分子量（Ｍｗ）は、
通常、４０，０００〜１００，０００程度である。生分
解性ポリオレフィン樹脂に用いられる微生物により重合
されるポリエステルとしては、３−ヒドロキシブチレー
トと３−ヒドロキシバリレートとのランダム共重合ポリ
エステルや、水素細菌に吉草酸を供給して得られる３−
ヒドロキシブチレート主体のポリエステル等が挙げられ
る。The polycaprolactane used for the biodegradable polyolefin resin is obtained by ring-opening polymerization of ε-caprolactan, and the polymerization average molecular weight (Mw) is
Usually, it is about 40,000 to 100,000. Examples of the polyester polymerized by the microorganism used for the biodegradable polyolefin resin include a random copolymerized polyester of 3-hydroxybutyrate and 3-hydroxyvalerate, and a polyester obtained by supplying valeric acid to hydrogen bacteria.
Hydroxybutyrate-based polyesters and the like can be mentioned.
【００１４】また、必要に応じて分解性樹脂とポリエチ
レン等の非分解性樹脂を混合してもよいが、分解性樹脂
と非分解性樹脂の合計を１００重量％として、分解性樹
脂混合量は５重量％が好ましい。分解性樹脂の混合量が
５重量％未満では、分解性が不十分となる。また、分解
性樹脂の原料として前述の微生物分解性樹脂と光分解性
樹脂を用いることにより、光分解性と微生物分解性を兼
ね備えた分解性樹脂を得ることができる。If necessary, a degradable resin and a non-degradable resin such as polyethylene may be mixed. However, the total amount of the degradable resin and the non-degradable resin is 100% by weight, and the amount of the degradable resin mixed is as follows. 5% by weight is preferred. If the amount of the decomposable resin is less than 5% by weight, the decomposability will be insufficient. Further, by using the above-mentioned microbial degradable resin and photodegradable resin as raw materials of the degradable resin, a degradable resin having both photodegradability and microbial degradability can be obtained.
【００１５】また、分解性プラスチック材料からなるシ
ートの形成方法としては、上記の樹脂を原料にして、例
えば圧縮成形法，射出成形法，押し出し成形法，積層成
形法，インフレーション成形法等の公知の方法によりシ
ートの形成を行う。As a method for forming a sheet made of a decomposable plastic material, a known method such as a compression molding method, an injection molding method, an extrusion molding method, a lamination molding method, an inflation molding method, etc. is used by using the above resin as a raw material. A sheet is formed by the method.
【００１６】本発明の分解性光記録媒体は、各種の光記
録媒体に適応できる。例えば、光ディスク、コンパクト
ディスク（ＣＤ）、ＣＤ−ＲＯＭ、ＤＶＤ等に適応でき
るものである。The degradable optical recording medium of the present invention can be applied to various optical recording media. For example, the present invention can be applied to an optical disk, a compact disk (CD), a CD-ROM, a DVD, and the like.
【００１７】[0017]
【実施例】以下、本発明の分解性光記録媒体の一実施例
を図面を用いて詳細に説明する。図１は本発明の分解性
光記録媒体の一実施例を示す平面図，図２は図１の断面
図，図３は図２の一部切り欠き拡大断面図である。本発
明の分解性光記録媒体の一実施例として、分解性光記録
媒体を光ディスクを例として説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the decomposable optical recording medium of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the degradable optical recording medium of the present invention, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of FIG. As an embodiment of the degradable optical recording medium of the present invention, a degradable optical recording medium will be described using an optical disk as an example.
【００１８】光ディスク１は、円板状の基材２の表面に
光記録層３が形成されている。基材２は、ＩＣＩ社製の
生分解性樹脂（商品名，Ｂｉｏｐｏｌ）を樹脂加工温度
１７０℃、押し出し速度３０ｍ／分の条件で押し出し成
形機によりシート加工を行い、その後に円板状に型抜き
を行った、厚み１．２ｍｍからなる円板状で透明な分解
性プラスチックシートである。The optical disc 1 has an optical recording layer 3 formed on the surface of a disk-shaped substrate 2. The base material 2 is obtained by subjecting a biodegradable resin (trade name, Biopol) manufactured by ICI Co., to a sheet processing by an extrusion molding machine at a resin processing temperature of 170 ° C. and an extrusion speed of 30 m / min. It is a disc-shaped transparent decomposable plastic sheet having a thickness of 1.2 mm, which has been punched.
【００１９】図３の一部切り欠き拡大断面図に示すよう
に、凹凸のピットが刻まれた基材２のピット部４にアル
ミ等の反射膜５をスパッタ等により製膜して光記録層３
を形成し、その上に透明な保護層６を形成してなるもの
である。保護層６も、分解可能な分解性プラスチック材
料を用いて形成している。また、基材２には、再生専用
型では、幅０．３μｍ、深さ０．１μｍ程度の凹凸のピ
ットの列が、また記録再生型では、幅０．５μｍ、深さ
０．０７μｍの溝が螺旋を描いて刻まれている。この凹
凸のピット列や溝は、１．５μｍ程度のピッチで規則正
しく並んでいる。また、記録再生型の光記録層３は、単
純な１層膜から複雑な多層膜まで種々様々なものがあ
り、その組成も様々である。As shown in a partially cutaway enlarged sectional view of FIG. 3, a reflective film 5 of aluminum or the like is formed on a pit portion 4 of a substrate 2 on which pits having irregularities are cut by sputtering or the like. 3
Is formed, and a transparent protective layer 6 is formed thereon. The protective layer 6 is also formed using a decomposable decomposable plastic material. In the base material 2, a row of uneven pits having a width of about 0.3 μm and a depth of about 0.1 μm is used for the read-only type, and a groove having a width of 0.5 μm and a depth of about 0.07 μm is used for the recording / reproducing type. Is engraved in a spiral. The uneven pit rows and grooves are regularly arranged at a pitch of about 1.5 μm. Further, the recording / reproducing optical recording layer 3 has various types from a simple single-layer film to a complicated multilayer film, and the composition thereof is also various.
【００２０】[0020]
【発明の効果】以上、詳細に説明したように、本発明の
分解性光記録媒体は、基材を自然界に廃棄しても、基材
の材質に自然界において分解するプラスチック樹脂を使
用しているので、たとえ分解性光記録媒体が放置処理さ
れた場合でも公害の発生を最小限にすることができると
共に、自然環境に対する悪影響も従来の光記録媒体より
も少ないものであり、各種利用分野や用途に幅広く活用
することの可能な分解性光記録媒体である。また、本発
明の分解性光記録媒体は、従来のような廃棄処理のため
の大がかりな処理設備も少なくてすみ、また分解性光記
録媒体を地下に埋め立てた場合でも地盤に対する悪影響
も従来の光記録媒体より少ないものである。従って、本
発明の分解性光記録媒体は、例えば光ディスク、コンパ
クトディスク等の各種光記録媒体に幅広く用いることが
できるものである。As described in detail above, the degradable optical recording medium of the present invention uses a plastic resin which decomposes in nature as a material of the substrate even if the substrate is discarded in nature. Therefore, even if the degradable optical recording medium is left untreated, the generation of pollution can be minimized, and the adverse effect on the natural environment is less than that of the conventional optical recording medium. It is a degradable optical recording medium that can be widely used in various fields. In addition, the degradable optical recording medium of the present invention requires less large-scale processing equipment for disposal as in the past, and even if the degradable optical recording medium is buried underground, the adverse effect on the ground is not affected by the conventional optical recording medium. Less than a recording medium. Therefore, the degradable optical recording medium of the present invention can be widely used for various optical recording media such as optical disks and compact disks.
【００２１】[0021]
【図１】本発明の分解性光記録媒体の一実施例を示す平
面図である。FIG. 1 is a plan view showing one embodiment of a degradable optical recording medium of the present invention.
【図２】図１の断面図である。FIG. 2 is a sectional view of FIG.
【図３】図２の一部切り欠き拡大断面図である。FIG. 3 is an enlarged cross-sectional view, partially cut away, of FIG. 2;
１ 光ディスク ２ 基材 ３ 光記録層 ４ ピット部 ５ 反射層 ６ 保護層 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Base material 3 Optical recording layer 4 Pit part 5 Reflection layer 6 Protective layer
Claims (3)
記録媒体において、光記録媒体を構成する基材（２）が
自然界において分解可能な分解性プラスチック材料から
なることを特徴とする分解性光記録媒体。1. An optical recording medium having an optical recording layer (3) on a substrate (2), wherein the substrate (2) constituting the optical recording medium is made of a degradable plastic material that can be decomposed in nature. Degradable optical recording medium.
より分解可能な生分解性樹脂からなることを特徴とする
請求項１記載の分解性光記録媒体。2. The degradable optical recording medium according to claim 1, wherein said degradable plastic material is made of a biodegradable resin decomposable by microorganisms.
トディスクであることを特徴とする請求項１又は請求項
２記載の分解性光記録媒体。3. The degradable optical recording medium according to claim 1, wherein the optical recording medium is an optical disk or a compact disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10181710A JP2000011448A (en) | 1998-06-29 | 1998-06-29 | Degradable optical recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10181710A JP2000011448A (en) | 1998-06-29 | 1998-06-29 | Degradable optical recording media |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000011448A true JP2000011448A (en) | 2000-01-14 |
Family
ID=16105513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10181710A Withdrawn JP2000011448A (en) | 1998-06-29 | 1998-06-29 | Degradable optical recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000011448A (en) |
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