JPH04372736A - Optical disk substrate - Google Patents
Optical disk substrateInfo
- Publication number
- JPH04372736A JPH04372736A JP3177467A JP17746791A JPH04372736A JP H04372736 A JPH04372736 A JP H04372736A JP 3177467 A JP3177467 A JP 3177467A JP 17746791 A JP17746791 A JP 17746791A JP H04372736 A JPH04372736 A JP H04372736A
- Authority
- JP
- Japan
- Prior art keywords
- heat resistance
- bending strength
- caprolactone
- optical disk
- modulus
- 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- Withdrawn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
- 239000000758 substrate Substances 0.000 title claims abstract description 29
- 230000003287 optical effect Effects 0.000 title claims abstract description 25
- MPIAGWXWVAHQBB-UHFFFAOYSA-N [3-prop-2-enoyloxy-2-[[3-prop-2-enoyloxy-2,2-bis(prop-2-enoyloxymethyl)propoxy]methyl]-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical class C=CC(=O)OCC(COC(=O)C=C)(COC(=O)C=C)COCC(COC(=O)C=C)(COC(=O)C=C)COC(=O)C=C MPIAGWXWVAHQBB-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011342 resin composition Substances 0.000 claims description 10
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 9
- PRBBFHSSJFGXJS-UHFFFAOYSA-N (2,2-dimethyl-3-prop-2-enoyloxypropyl) prop-2-enoate;3-hydroxy-2,2-dimethylpropanoic acid Chemical class OCC(C)(C)C(O)=O.C=CC(=O)OCC(C)(C)COC(=O)C=C PRBBFHSSJFGXJS-UHFFFAOYSA-N 0.000 claims description 5
- 238000000016 photochemical curing Methods 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 21
- 239000011347 resin Substances 0.000 abstract description 17
- 229920005989 resin Polymers 0.000 abstract description 17
- YDKNBNOOCSNPNS-UHFFFAOYSA-N methyl 1,3-benzoxazole-2-carboxylate Chemical compound C1=CC=C2OC(C(=O)OC)=NC2=C1 YDKNBNOOCSNPNS-UHFFFAOYSA-N 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- FHLPGTXWCFQMIU-UHFFFAOYSA-N [4-[2-(4-prop-2-enoyloxyphenyl)propan-2-yl]phenyl] prop-2-enoate Chemical class C=1C=C(OC(=O)C=C)C=CC=1C(C)(C)C1=CC=C(OC(=O)C=C)C=C1 FHLPGTXWCFQMIU-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- VBZYPJAXRLNOCG-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol;oxepan-2-one Chemical compound O=C1CCCCCO1.OCC(CO)(CO)COCC(CO)(CO)CO VBZYPJAXRLNOCG-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- GKZPEYIPJQHPNC-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)propane-1,3-diol prop-2-enoic acid Chemical compound OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OCC(CO)(CO)CO GKZPEYIPJQHPNC-UHFFFAOYSA-N 0.000 description 1
- PASIEQDVKZQWRI-UHFFFAOYSA-N 2,2-dimethylpropane-1,3-diol 3-hydroxy-2,2-dimethylpropanoic acid prop-2-enoic acid Chemical compound OC(=O)C=C.OC(=O)C=C.OCC(C)(C)CO.OCC(C)(C)C(O)=O PASIEQDVKZQWRI-UHFFFAOYSA-N 0.000 description 1
- FIHBHSQYSYVZQE-UHFFFAOYSA-N 6-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCOC(=O)C=C FIHBHSQYSYVZQE-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は光ディスク基板に関し、
特にデジタルオーディオディスク基板に関する。[Industrial Application Field] The present invention relates to an optical disc substrate.
Particularly related to digital audio disc boards.
【０００２】0002
【従来の技術】近年、光ディスクは高密度、かつ非接触
方式で記録・再生が可能であるという特長を有すること
から、大容量かつ高信頼性のメモリとして期待されてい
る。光ディスクメディアの性能は光ディスク基板の特性
に依存する部分が大きく、現時点では、主としてポリカ
ーボネート、ポリメチルメタクリレートなどの透明性が
極めて高い材料が用いられている。しかし、前者は複屈
折が大きく、後者は吸水率が高く耐熱性が低いなどいず
れも満足すべき材料であるとは言い難い。2. Description of the Related Art In recent years, optical disks are expected to be used as large-capacity and highly reliable memories because they have the characteristics of high density and non-contact recording and reproduction. The performance of optical disc media largely depends on the characteristics of the optical disc substrate, and at present, extremely transparent materials such as polycarbonate and polymethyl methacrylate are mainly used. However, the former has large birefringence, and the latter has high water absorption and low heat resistance, so it is difficult to say that these materials are satisfactory.
【０００３】ところで、光ディスク基板を作製するにあ
たっては、従来、光硬化性の樹脂を成形型内で硬化させ
る、所謂、２Ｐ法が検討されている。具体的には、ガラ
ス、ポリカーボネート、アクリル樹脂などの平板上に粘
度の低い光硬化性樹脂を流し込み、そのうえからスタン
パを押し当てて硬化させる２層式が主に採用されている
。この２Ｐ法は粘度の低い樹脂を用いて成形するために
信号の転写性に優れ、また、内部歪を生じないので複屈
折が小さいなどの利点を有している。By the way, in the production of optical disc substrates, the so-called 2P method, in which a photocurable resin is cured within a mold, has been studied. Specifically, a two-layer method is mainly used in which a low-viscosity photocurable resin is poured onto a flat plate of glass, polycarbonate, acrylic resin, etc., and then a stamper is pressed against the resin to harden it. The 2P method has advantages such as excellent signal transferability because it is molded using a resin with low viscosity, and low birefringence because it does not generate internal distortion.
【０００４】0004
【発明が解決しようとする課題】しかしながら、上述し
たような２層式の光ディスク基板の場合、例えば平板と
してガラスを用いると、重い、高価であるなどの問題が
ある。一方、平板としてポリカーボネートやアクリル樹
脂を用いると、これらの樹脂の特性が光ディスク全体に
影響し、光硬化性樹脂の利点、例えば、低い複屈折など
を十分に発揮させることができないという問題がある。However, in the case of the above-mentioned two-layer optical disc substrate, if glass is used for the flat plate, for example, there are problems such as heavy weight and high cost. On the other hand, when polycarbonate or acrylic resin is used as the flat plate, there is a problem that the properties of these resins affect the entire optical disc, making it impossible to fully utilize the advantages of photocurable resins, such as low birefringence.
【０００５】このような問題は、従来のような２層式で
はなく、基板全体を光硬化性樹脂で作製すれば解決する
ことである。しかし、その場合は、支持体となる平板を
使用しないため、ヤング率が高く、曲げ強さが大きく、
更に耐熱性に優れるという特性が光硬化性樹脂に新たに
要求されることになる。ところが、光硬化性樹脂は、一
般的に脆くて割れやすく、耐熱性が低いという性質があ
る。例えば、トリメチロールプロパントリアクリレート
、ジペンタエリスリトールヘキサアクリレートなどの３
官能以上の樹脂は、耐熱性には優れるが、脆いという問
題があり、金型からの離型の際に割れてしまう。一方、
ＥＯ変性ビスフェノールＡジアクリレートやヒドロキシ
ピバリン酸ネオペンチルグリコールジアクリレートなど
は、曲げに対して強く離型の際に割れることはないが、
耐熱性が低いという問題がある。このように、従来の光
硬化性樹脂には、光ディスク基板に要求される曲げ強度
と耐熱性とを兼ね備えた材料がなく、光ディスク基板材
料としての実用化には至っていない。[0005] Such problems can be solved by making the entire substrate from a photocurable resin instead of the conventional two-layer type. However, in this case, since a flat plate is not used as a support, the Young's modulus is high and the bending strength is large.
Furthermore, there is a new requirement for photocurable resins to have excellent heat resistance. However, photocurable resins are generally brittle, easily cracked, and have low heat resistance. For example, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, etc.
Although functional resins have excellent heat resistance, they have the problem of being brittle and break when released from the mold. on the other hand,
EO-modified bisphenol A diacrylate and hydroxypivalic acid neopentyl glycol diacrylate are strong against bending and do not crack during mold release, but
There is a problem of low heat resistance. As described above, there is no conventional photocurable resin material that has both the bending strength and heat resistance required for optical disc substrates, and it has not been put to practical use as an optical disc substrate material.
【０００６】したがって、本発明は、ヤング率、曲げ強
さおよび耐熱性の点でバランスのよい特性を備えた光デ
ィスク基板を提供することを目的とする。[0006] Accordingly, an object of the present invention is to provide an optical disk substrate having well-balanced properties in terms of Young's modulus, bending strength, and heat resistance.
【０００７】[0007]
【課題を解決するための手段および作用】上記目的を達
成するため、本発明によれば、トリメチロールプロパン
トリアクリレート４０乃至５０重量％、カプロラクトン
変性ジペンタエリスリトールヘキサアクリレート３０乃
至４０重量％およびカプロラクトン変性ヒドロキシピバ
リン酸ネオペンチルグリコールジアクリレート２０乃至
３０重量％からなる樹脂組成物を光硬化させて得られた
光ディスク基板が提供される。[Means and effects for solving the problems] In order to achieve the above objects, according to the present invention, 40 to 50% by weight of trimethylolpropane triacrylate, 30 to 40% by weight of caprolactone-modified dipentaerythritol hexaacrylate, and caprolactone-modified An optical disk substrate obtained by photocuring a resin composition comprising 20 to 30% by weight of neopentyl hydroxypivalate glycol diacrylate is provided.
【０００８】以下に本発明を完成するに至った経緯につ
いて簡単に説明する。[0008] The circumstances that led to the completion of the present invention will be briefly explained below.
【０００９】光重合可能なオリゴマーとしては、エポキ
シ（メタ）アクリレート、ウレタン（メタ）アクリレー
ト、ポリエステル（メタ）アクリレート、不飽和ポリエ
ステルなどがあげられ、また、モノマーとしては、トリ
メチロールプロパントリアクリレート、ジペンタエリス
リトールヘキサアクリレート、１，６−ヘキサンジオー
ルジアクリレート、ネオペンチルグリコールジアクリレ
ートなどがあげられる。しかし、いずれも、硬化物の物
性としては一長一短であり、単独で光ディスク基板材料
としての要求を満足するには至らない。Examples of photopolymerizable oligomers include epoxy (meth)acrylate, urethane (meth)acrylate, polyester (meth)acrylate, and unsaturated polyester, and examples of monomers include trimethylolpropane triacrylate and dipropane triacrylate. Examples include pentaerythritol hexaacrylate, 1,6-hexanediol diacrylate, and neopentyl glycol diacrylate. However, each of these has advantages and disadvantages in terms of physical properties of the cured product, and cannot satisfy the requirements as an optical disk substrate material alone.
【００１０】前述したように、光ディスク基板材料には
、ある程度以上の曲げ強さとヤング率が要求される。
この曲げ強さが小さいと離型の際の力に耐えられず割れ
てしまう場合が多い。また、室温におけるヤング率は１
００ｋｇ／ｍｍ２以上であることが必要である。これよ
り小さい値では、成形における離型の際に受ける力によ
り反りや寸法変化が大きくなる可能性がある。更に、耐
熱性の点では、ＣＤの使用温度範囲、すなわち、５〜５
５℃以上の耐熱温度が必要とされる。これまでは、２層
式のディスクについては、樹脂の特性として粘度や基板
との密着性などが重要視されてきたが、本発明では基板
全体が光硬化性樹脂よりなる光ディスク基板を目的とす
るため、樹脂の粘度や密着性などは考慮する必要がない
。したがって、本発明者は新たにヤング率、曲げ強さお
よび耐熱性に着目し、これらの条件を一部満足する複数
の樹脂を混合し、夫々の樹脂の持つ弱点を補い合い、長
所を十分に発揮させることが可能となる配合割合を見い
だして本発明を完成するに至った。As mentioned above, the optical disk substrate material is required to have a certain level of bending strength and Young's modulus. If this bending strength is low, the product cannot withstand the force during demolding and often breaks. Also, Young's modulus at room temperature is 1
00 kg/mm2 or more. If the value is smaller than this, there is a possibility that warpage or dimensional change will increase due to the force received during mold release during molding. Furthermore, in terms of heat resistance, the operating temperature range of CD, that is, 5 to 5
A heat resistance temperature of 5°C or higher is required. Until now, for two-layer discs, emphasis has been placed on resin properties such as viscosity and adhesion to the substrate, but the present invention aims to provide an optical disc substrate whose entire substrate is made of photocurable resin. Therefore, there is no need to consider the viscosity or adhesiveness of the resin. Therefore, the inventor of the present invention newly focused on Young's modulus, bending strength, and heat resistance, mixed multiple resins that partially satisfy these conditions, compensated for the weaknesses of each resin, and fully exhibited the strengths. The present invention was completed by finding a blending ratio that makes it possible to achieve this.
【００１１】本発明の光ディスク基板に使用される樹脂
組成物の第１の構成成分であるトリメチロールプロパン
トリアクリレートは、耐熱性に優れ、ヤング率も高いが
、脆く、曲げに対しては弱いという性質を有する。そし
て、第２の構成成分であるカプロラクトン変性ジペンタ
エリスリトールヘキサアクリレートは６官能モノマーで
あるにもかかわらず、分子量が大きいため曲げ強さに優
れている。第３の構成成分であるカプロラクトン変性ヒ
ドロキシピバリン酸ネオペンチルグリコールジアクリレ
ートは、曲げ強さには極めて優れているが、ガラス転移
点が氷点下で耐熱性が低い。本発明における樹脂組成物
はこれら第１、第２および第３の各構成成分を、それぞ
れ、４０〜５０重量％、３０〜４０重量％および２０〜
３０重量％配合して得られるものである。これらの各成
分の配合量をこの範囲に限定したことにより、カプロラ
クトン変性ヒドロキシピバリン酸ネオペンチルグリコー
ルジアクリレートの曲げ強さ、およびトリメチロールプ
ロパントリアクリレートの高いヤング率と耐熱性を十分
に発揮させることが可能となる。Trimethylolpropane triacrylate, which is the first component of the resin composition used in the optical disc substrate of the present invention, has excellent heat resistance and a high Young's modulus, but is said to be brittle and weak against bending. have a property. Although caprolactone-modified dipentaerythritol hexaacrylate, which is the second component, is a hexafunctional monomer, it has a large molecular weight and therefore has excellent bending strength. The third component, caprolactone-modified hydroxypivalic acid neopentyl glycol diacrylate, has extremely good bending strength, but has a glass transition point below freezing and low heat resistance. The resin composition of the present invention contains 40 to 50% by weight, 30 to 40% by weight, and 20 to 20% by weight of these first, second, and third components, respectively.
It is obtained by blending 30% by weight. By limiting the amount of each of these components within this range, the bending strength of caprolactone-modified hydroxypivalic acid neopentyl glycol diacrylate and the high Young's modulus and heat resistance of trimethylolpropane triacrylate can be fully exhibited. becomes possible.
【００１２】なお、上記の樹脂組成物には、第１〜３の
構成成分の他に、光硬化速度を増大させるための一般的
な光重合開始剤、光増感剤などを添加してもよい。[0012] In addition to the first to third constituent components, general photopolymerization initiators, photosensitizers, etc. may be added to the above resin composition to increase the photocuring speed. good.
【００１３】本発明の光ディスク基板は、上記の樹脂組
成物を例えば所定形状の成形型内に注入し、紫外線硬化
させることにより製造される。The optical disc substrate of the present invention is manufactured by injecting the above resin composition into a mold having a predetermined shape, for example, and curing it with ultraviolet light.
【００１４】[0014]
【実施例】以下に、本発明の具体的実施例について説明
する。[Examples] Specific examples of the present invention will be described below.
【００１５】実施例１〜３
トリメチロールプロパントリアクリレート、カプロラク
トン変性ジペンタエリスリトールヘキサアクリレートお
よびカプロラクトン変性ヒドロキシピパリン酸ネオペン
チルグリコールジアクリレートを表に示した混合比で混
合し、これに、光重合開始剤として２−ヒドロキシ−２
−メチル−１−フェニルプロパン−１−オンを添加して
樹脂組成物を調製した。得られた各樹脂組成物をＰＥＴ
フィルムで挟み、照度分布６８２ｍＷ±３２％の高圧水
銀灯を用いて、９０秒間紫外線照射を行うことにより、
厚さ５０μｍの試料を得た。この試料を用いて以下に示
す特性評価試験を行い、結果を表中に示した。Examples 1 to 3 Trimethylolpropane triacrylate, caprolactone-modified dipentaerythritol hexaacrylate, and caprolactone-modified hydroxypipalic acid neopentyl glycol diacrylate were mixed at the mixing ratio shown in the table, and then photopolymerization was initiated. 2-hydroxy-2 as an agent
-Methyl-1-phenylpropan-1-one was added to prepare a resin composition. Each of the obtained resin compositions was made into PET
By sandwiching it between films and irradiating it with ultraviolet rays for 90 seconds using a high-pressure mercury lamp with an illuminance distribution of 682 mW ± 32%,
A sample with a thickness of 50 μm was obtained. Using this sample, the following characteristic evaluation test was conducted and the results are shown in the table.
【００１６】（１）ヤング率、耐熱温度ＴＭＡ法により
ヤング率の温度変化を求め、室温でのヤング率とともに
、そのヤング率が７０ｋｇ／ｍｍ２以下になる温度を求
めて耐熱温度とした。ＣＤの場合、ヤング率が７０ｋｇ
／ｍｍ２以下になると平面性などに支障を来し、再生で
きなくなる場合があるため、ＣＤとしての機能を満足す
る限界の温度を耐熱温度とした。(1) Young's Modulus and Heat Resistance Temperature Changes in Young's modulus with temperature were determined by the TMA method, and the temperature at which the Young's modulus was 70 kg/mm 2 or less was determined as well as the Young's modulus at room temperature, which was defined as the heat resistance temperature. In the case of CD, Young's modulus is 70 kg
If it is less than /mm2, the flatness may be affected and playback may not be possible. Therefore, the limit temperature that satisfies the function as a CD was defined as the heat-resistant temperature.
【００１７】（２）曲げ強さ
図１に示すように、幅５ｍｍ、厚さ５０μｍのフィルム
状試料１の両端を支持体２、３により固定し、図２に示
すように、支持体２、３間の距離を一定の速度で縮めて
いき、最終的には図３に示すように、試料１を輪状にす
る。このとき、試料１が折れないで輪状になる限界の試
料長を曲げ強さの評価値とした。(2) Bending strength As shown in FIG. 1, both ends of a film sample 1 with a width of 5 mm and a thickness of 50 μm are fixed with supports 2 and 3, and as shown in FIG. The distance between the samples 1 and 3 is reduced at a constant speed, and finally the sample 1 is formed into a ring shape as shown in FIG. At this time, the limit sample length in which sample 1 becomes ring-shaped without breaking was taken as the evaluation value of bending strength.
【００１８】比較例１〜４
トリメチロールプロパントリアクリレート、ジペンタエ
リスリトールヘキサアクリレート、ＥＯ変性ビスフェノ
ールＡジアクリレート、ヒドロキシピバリン酸ネオペン
チルグリコールジアクリレートの夫々を上記実施例と同
様の条件で硬化させて、フィルム状試料を得た。これら
の各試料についても、上記と同様の評価試験を行い、結
果を表１中に示した。Comparative Examples 1 to 4 Trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, EO-modified bisphenol A diacrylate, and neopentyl glycol hydroxypivalate diacrylate were each cured under the same conditions as in the above examples. A film sample was obtained. Evaluation tests similar to those described above were also conducted for each of these samples, and the results are shown in Table 1.
【表１】[Table 1]
【００１９】表に示した結果からも明らかなように、実
施例１〜３の本発明の光ディスク基板はヤング率、耐熱
性、および曲げ強さにおいて、ＣＤ基板として要求され
る条件を満足しており、バランスのとれた基板特性を有
することが確認された。一方、比較例１、２のトリメチ
ロールプロパントリアクリレートとジペンタエリスリト
ールヘキサアクリレートをそれぞれ単独で使用したもの
は、ともに高いヤング率を有し、耐熱性にも優れるが、
曲げ強さが十分ではなく、比較例３、４のＥＯ変性ビス
フェノールＡジアクリレートとヒドロキシピバリン酸ネ
オペンチルグリコールジアクリレートをそれぞれ単独で
使用したものは、ともに曲げ強さには優れているものの
、耐熱性が低く、いずれもＣＤ基板としての要求特性を
満足するものではなかった。As is clear from the results shown in the table, the optical disk substrates of Examples 1 to 3 of the present invention satisfied the conditions required for CD substrates in terms of Young's modulus, heat resistance, and bending strength. It was confirmed that the substrate had well-balanced characteristics. On the other hand, Comparative Examples 1 and 2, in which trimethylolpropane triacrylate and dipentaerythritol hexaacrylate were used alone, both had high Young's modulus and excellent heat resistance, but
The bending strength was not sufficient, and the products in which EO-modified bisphenol A diacrylate and hydroxypivalic acid neopentyl glycol diacrylate of Comparative Examples 3 and 4 were used alone had excellent bending strength, but had poor heat resistance. Both of them had low properties and did not satisfy the required characteristics as a CD substrate.
【００２０】[0020]
【発明の効果】以上詳細に説明したところから明らかな
ように、本発明の光ディスク基板は、曲げ強さ、ヤング
率および耐熱性の全ての点で基板としての要求特性を満
足する樹脂組成物を成形して得られたものであるため、
従来の２層式の光ディスク基板のように平板の重さ、特
性など光ディスク全体に与える影響を考慮する必要がな
いという利点を有する。したがって、広範な分野での応
用が可能であり、特に、デジタルオーディオディスク基
板などとして極めて有用である。Effects of the Invention As is clear from the above detailed explanation, the optical disk substrate of the present invention is made of a resin composition that satisfies the required characteristics as a substrate in all respects of bending strength, Young's modulus, and heat resistance. Because it is obtained by molding,
It has the advantage that unlike conventional two-layer optical disc substrates, there is no need to consider the effects on the entire optical disc, such as the weight and characteristics of the flat plate. Therefore, it can be applied in a wide range of fields, and is particularly useful as a digital audio disc substrate.
【図１】本発明におけるフィルム状試料の曲げ強さの測
定方法を示した説明図である。FIG. 1 is an explanatory diagram showing a method for measuring the bending strength of a film-like sample in the present invention.
【図２】本発明におけるフィルム状試料の曲げ強さの測
定方法を示した説明図である。FIG. 2 is an explanatory diagram showing a method for measuring the bending strength of a film sample in the present invention.
【図３】本発明におけるフィルム状試料の曲げ強さの測
定方法を示した説明図である。FIG. 3 is an explanatory diagram showing a method for measuring the bending strength of a film-like sample in the present invention.
１ 試料 ２ 支持体 ３ 支持体 1 Sample 2 Support 3 Support
Claims (2)
ート４０乃至５０重量％、カプロラクトン変性ジペンタ
エリスリトールヘキサアクリレート３０乃至４０重量％
およびカプロラクトン変性ヒドロキシピバリン酸ネオペ
ンチルグリコールジアクリレート２０乃至３０重量％か
らなる樹脂組成物を光硬化させて得られた光ディスク基
板。Claim 1: 40-50% by weight of trimethylolpropane triacrylate, 30-40% by weight of caprolactone-modified dipentaerythritol hexaacrylate.
and caprolactone-modified hydroxypivalic acid neopentyl glycol diacrylate in an amount of 20 to 30% by weight. An optical disc substrate obtained by photocuring a resin composition.
形状の成形型内に注入し、紫外線照射により光硬化させ
て得られた光ディスク基板。2. An optical disc substrate obtained by injecting the resin composition according to claim 1 into a mold having a predetermined shape and photocuring it by irradiating ultraviolet rays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3177467A JPH04372736A (en) | 1991-06-21 | 1991-06-21 | Optical disk substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3177467A JPH04372736A (en) | 1991-06-21 | 1991-06-21 | Optical disk substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04372736A true JPH04372736A (en) | 1992-12-25 |
Family
ID=16031439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3177467A Withdrawn JPH04372736A (en) | 1991-06-21 | 1991-06-21 | Optical disk substrate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04372736A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011140554A (en) * | 2010-01-07 | 2011-07-21 | Mitsubishi Rayon Co Ltd | Undercoat layer-forming coating material composition for metal deposition and resin molded product |
| WO2011093089A1 (en) * | 2010-01-29 | 2011-08-04 | 日本化薬株式会社 | Optical disc having organic pigment recording layer, and uv-curable resin composition therefor |
-
1991
- 1991-06-21 JP JP3177467A patent/JPH04372736A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011140554A (en) * | 2010-01-07 | 2011-07-21 | Mitsubishi Rayon Co Ltd | Undercoat layer-forming coating material composition for metal deposition and resin molded product |
| WO2011093089A1 (en) * | 2010-01-29 | 2011-08-04 | 日本化薬株式会社 | Optical disc having organic pigment recording layer, and uv-curable resin composition therefor |
| JP4994518B2 (en) * | 2010-01-29 | 2012-08-08 | 日本化薬株式会社 | Optical disc having organic dye recording layer and ultraviolet curable resin composition therefor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980903 |