JPH08208755A - Highly refractive lens - Google Patents
Highly refractive lensInfo
- Publication number
- JPH08208755A JPH08208755A JP28028195A JP28028195A JPH08208755A JP H08208755 A JPH08208755 A JP H08208755A JP 28028195 A JP28028195 A JP 28028195A JP 28028195 A JP28028195 A JP 28028195A JP H08208755 A JPH08208755 A JP H08208755A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- lens
- dyeability
- polymerization
- acrylonitrile
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、眼鏡レンズ、その
他光学レンズ用素材としての利用が可能である耐熱性及
び染色性に優れ、かつ良好な透明性を有する熱可塑性樹
脂を含んでなる高屈折レンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high refraction index containing a thermoplastic resin which can be used as a material for eyeglass lenses and other optical lenses, has excellent heat resistance and dyeability, and has good transparency. Regarding the lens.
【０００２】[0002]
【従来の技術】従来、光学レンズ用材料には透明度の高
いアクリル樹脂、ジエチレングリコールビスアリルカー
ボネート樹脂、ポリスチレン、ポリカーボネート等が使
用されているが、この内で眼鏡レンズとして広く用いら
れているのは、熱硬化性樹脂であるジエチレングリコー
ルビスアリルカーボネートを用いたレンズである。その
理由は、耐熱性、耐衝撃性及び染色性に優れているため
である。また、所望する形状に加工する際の切削加工性
に優れている。2. Description of the Related Art Conventionally, highly transparent acrylic resins, diethylene glycol bisallyl carbonate resins, polystyrene, polycarbonate, etc. have been used as materials for optical lenses, and among them, those widely used as spectacle lenses are: It is a lens using diethylene glycol bisallyl carbonate which is a thermosetting resin. The reason is that it is excellent in heat resistance, impact resistance and dyeability. Further, it is excellent in cutting workability when processing into a desired shape.
【０００３】しかし、ジエチレングリコールビスアリル
カーボネートを用いたレンズは、屈折率が１．５であ
り、ガラスレンズに比べてレンズの厚みが大きくなる
（特にレンズ度数が大きくなると顕著である）という欠
点がある。最近は、眼鏡レンズの薄型化、軽量化がより
望まれており、それを可能とする高屈折率を有する眼鏡
レンズ用材料の必要性が出てきた。ポリスチレン（屈折
率１．６、アツベ数３０）あるいはポリカーボネート
（屈折率１．５８、アツベ数３０）を用いたレンズは、
高屈折率であるが、アツベ数が小さいために色収差が大
きく、また、染色性に劣り、さらに前者においては耐熱
性が劣る。一方、レンズの製造方法について考えてみる
と、アクリル樹脂、ポリスチレン及びポリカーボネート
は熱可塑性であるため、射出成形が可能で大量生産が容
易であるのに対し、ジエチレングリコールビスアリルカ
ーボネートは、熱硬化性であるため注型法によってしか
作ることができず、大量生産には不向きである。However, a lens using diethylene glycol bisallyl carbonate has a drawback that the refractive index is 1.5 and the thickness of the lens is larger than that of a glass lens (particularly remarkable when the lens power is large). . Recently, it has been desired to reduce the thickness and weight of spectacle lenses, and there is a need for a material for spectacle lenses having a high refractive index that enables the reduction. Lenses made of polystyrene (refractive index 1.6, Abbé number 30) or polycarbonate (refractive index 1.58, Abbé number 30)
Although it has a high refractive index, it has large chromatic aberration due to a small Abbe's number, is poor in dyeability, and is poor in heat resistance in the former case. On the other hand, considering the manufacturing method of the lens, acrylic resin, polystyrene, and polycarbonate are thermoplastic, and thus injection molding is possible and mass production is easy, whereas diethylene glycol bisallyl carbonate is thermosetting. Since it can only be produced by the casting method, it is not suitable for mass production.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、以上の点に
鑑み、耐熱性及び染色性に優れ、かつ射出成形可能な眼
鏡レンズに有用な高屈折レンズを提供することを目的と
する。SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a high-refractive-index lens which is excellent in heat resistance and dyeability and which is useful as an injection-moldable spectacle lens.
【０００５】[0005]
【課題を解決するための手段】本発明は、スチレン３５
〜７０重量％、アクリロニトリル１０〜２５重量％及び
メタクリル酸トリシクロ［５，２，１，０2,6］デカ−
８−イル１０〜４０重量％［総量で１００重量％］を重
合して得られる熱可塑性樹脂を含んでなる高屈折レンズ
に関する。前記熱可塑性樹脂の屈折率が１．５３以上、
アツベ数が３５以上及びレンズ染色性が良好であること
が好ましい。The present invention relates to styrene 35
70 wt% of acrylonitrile 10-25% by weight and methacrylic acid tricyclo [5,2,1,0 2,6] deca -
The present invention relates to a high-refractive-index lens comprising a thermoplastic resin obtained by polymerizing 10-40 wt% of 8-yl [100 wt% in total]. The refractive index of the thermoplastic resin is 1.53 or more,
It is preferable that the Abbe number is 35 or more and the lens dyeing property is good.
【０００６】[0006]
【発明の実施の形態】前記熱可塑性樹脂について説明す
る。メタクリル酸トリシクロ［５，２，１，０2,6］デ
カ−８−イルの使用量は１０〜４０重量％の範囲とされ
る。１０重量％未満では耐熱性向上の効果が少なく、４
０重量％を越えるとメタクリル酸トリシクロ［５，２，
１，０2,6］デカ−８−イルが未反応モノマーとして残
存する。アクリロニトリルの使用量は１０〜２５重量％
の範囲とされる。好ましくは１５〜２０重量％の範囲と
される。１０重量％未満では透明性及び染色性が低下す
る。２５重量％を越えると樹脂が着色する。スチレンの
使用量は３５〜７０重量％の範囲とされる。４０〜６０
重量％の範囲が好ましい。３５重量％未満では屈折率が
低下し、７０重量％を越えるとアツベ数が低くなり、染
色性が低下する。BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin will be described. The amount of tricyclo [5,2,1,0 2,6 ] deca-8-yl methacrylate used is in the range of 10 to 40% by weight. If it is less than 10% by weight, the effect of improving the heat resistance is small and 4
If it exceeds 0% by weight, tricyclo methacrylate [5,2,2]
1,0 2,6 ] dec-8-yl remains as an unreacted monomer. Acrylonitrile usage is 10-25% by weight
Range. It is preferably in the range of 15 to 20% by weight. If it is less than 10% by weight, the transparency and the dyeability are deteriorated. If it exceeds 25% by weight, the resin will be colored. The amount of styrene used is in the range of 35 to 70% by weight. 40-60
A weight% range is preferred. If it is less than 35% by weight, the refractive index is lowered, and if it exceeds 70% by weight, the Abbé number is lowered and the dyeability is lowered.
【０００７】本発明における熱可塑性樹脂の製造には、
公知の重合法を用いることができるが、懸濁重合法が好
ましい。塊状重合法では特殊な反応器を必要とし、反応
制御が複雑となる。溶液重合法は塊状重合法と同様の欠
点を持つ上、生産性が悪い。乳化重合は多量の乳化剤を
必要とするため透明性が低下する。In the production of the thermoplastic resin of the present invention,
A known polymerization method can be used, but a suspension polymerization method is preferable. The bulk polymerization method requires a special reactor and the reaction control becomes complicated. The solution polymerization method has the same drawbacks as the bulk polymerization method and has poor productivity. Emulsion polymerization requires a large amount of emulsifiers, and thus the transparency decreases.
【０００８】重合に用いる開始剤としては、例えば、過
酸化ベンゾイル、過酸化ラウロイル、ジ−ｔ−ブチルパ
ーオキシヘキサヒドロテレフタレート、ｔ−ブチルパー
オキシ−２−エチルヘキサノエート、１，１−ジ−ｔ−
ブチルパーオキシ−３，３，５−トリメチルシクロヘキ
サンなどの有機過酸化物、アゾビスイソブチロニトリ
ル、アゾビス−４−メトキシ−２，４−ジメチルバレロ
ニトリル、アゾビスシクロヘキサノン−１−カルボニト
リル、アゾジベンゾイルなどのアゾ化合物、過硫酸カリ
ウム、過硫酸アンモニウム等の水溶性触媒及び過酸化物
あるいは過硫酸塩と還元剤との組合せによるレドックス
触媒など通常のラジカル重合に使用できるものはいずれ
も可能である。重合触媒は単量体混合物の０．０１〜
１．０重量％の範囲で使用することが好ましい。また、
２成分以上使用することも可能である。連鎖移動剤とし
ては、メルカプタン系化合物、チオグリコール、四塩化
炭素、α−メチルスチレンダイマーなどが使用可能であ
るが、重合体の総合的な物性からメルカプタン系化合物
を使用することが好ましい。Examples of the initiator used for the polymerization include benzoyl peroxide, lauroyl peroxide, di-t-butylperoxyhexahydroterephthalate, t-butylperoxy-2-ethylhexanoate, 1,1-di -T-
Organic peroxides such as butylperoxy-3,3,5-trimethylcyclohexane, azobisisobutyronitrile, azobis-4-methoxy-2,4-dimethylvaleronitrile, azobiscyclohexanone-1-carbonitrile, azo Any azo compound such as dibenzoyl, a water-soluble catalyst such as potassium persulfate or ammonium persulfate, and a redox catalyst formed by combining a peroxide or a persulfate with a reducing agent can be used for any ordinary radical polymerization. . The polymerization catalyst is 0.01 to 0.01
It is preferably used in the range of 1.0% by weight. Also,
It is also possible to use two or more components. As the chain transfer agent, mercaptan compounds, thioglycol, carbon tetrachloride, α-methylstyrene dimer and the like can be used, but it is preferable to use mercaptan compounds from the viewpoint of the overall physical properties of the polymer.
【０００９】懸濁重合において、重合温度は、３成分系
であり反応速度がかなり異なるため注意する必要があ
る。この重合温度は、６５℃〜８０℃の温度から段階的
に昇温する（通常は１００℃まで昇温する）ことが好ま
しい。６５℃から段階的に昇温することがより好まし
い。６５℃未満の温度から段階的昇温を始めると、重合
時間が長くなり、生産性が低下しやすい。８０℃を越え
た温度から段階的昇温を始めると、該温度がアクリロニ
トリルの沸点以上であるためアクリロニトリルが気相と
なって反応系の外にでてしまい共重合にあずかれないこ
とがある。懸濁重合は、水性媒体中で行われ、懸濁剤が
添加される。懸濁剤としては、例えば、ポリビニルアル
コール、メチルセルロース、ポリアクリルアミド、ポリ
（メタ）アクリル酸塩等の水溶性高分子、燐酸カルシウ
ム、ピロ燐酸マグネシウム等の難溶性無機物質などが使
用できる。透明性の点から、懸濁剤としてポリ（メタ）
アクリル酸塩を使用することが好ましい。また、懸濁剤
は単量体混合物の０．０３〜１．０重量％の範囲で使用
することが好ましい。In suspension polymerization, it should be noted that the polymerization temperature is a three-component system and the reaction rates are considerably different. The polymerization temperature is preferably raised stepwise from a temperature of 65 ° C to 80 ° C (usually raised to 100 ° C). More preferably, the temperature is raised stepwise from 65 ° C. When the stepwise temperature increase is started from a temperature lower than 65 ° C., the polymerization time becomes long and the productivity tends to decrease. When stepwise temperature increase is started from a temperature exceeding 80 ° C., since the temperature is equal to or higher than the boiling point of acrylonitrile, acrylonitrile becomes a gas phase and goes out of the reaction system, sometimes failing to participate in copolymerization. The suspension polymerization is carried out in an aqueous medium and a suspending agent is added. Examples of the suspending agent that can be used include water-soluble polymers such as polyvinyl alcohol, methyl cellulose, polyacrylamide, and poly (meth) acrylate, and poorly soluble inorganic substances such as calcium phosphate and magnesium pyrophosphate. From the perspective of transparency, poly (meth) as a suspending agent
Preference is given to using acrylates. The suspending agent is preferably used in the range of 0.03 to 1.0% by weight of the monomer mixture.
【００１０】水溶性高分子であるポリ（メタ）アクリル
酸塩は、例えば次のようにして製造できる。すなわち、
ヒドロキシアルキル（メタ）アクリレート、（メタ）ア
クリル酸の塩（リチウム塩、ナトリウム塩、カリウム
塩、マグネシウム塩、カルシウム塩、アンモニウム塩
等）、（メタ）アクリル酸及び必要に応じてこれら以外
のこれらと共重合可能な他の不飽和単量体を重合して水
溶性高分子である（メタ）アクリル酸塩を製造できる。The water-soluble polymer poly (meth) acrylate can be produced, for example, as follows. That is,
Hydroxyalkyl (meth) acrylate, salt of (meth) acrylic acid (lithium salt, sodium salt, potassium salt, magnesium salt, calcium salt, ammonium salt, etc.), (meth) acrylic acid and, if necessary, other than these A water-soluble polymer (meth) acrylate can be produced by polymerizing another copolymerizable unsaturated monomer.
【００１１】本発明によって得られる熱可塑性樹脂は、
その分子量について特に制限はないが、耐熱性、機械物
性の観点から、重量平均分子量（ポリスチレン換算）が
１０，０００〜１，０００，０００の範囲のものが好ま
しく、この範囲のものは特に、成形材料として使用する
場合に好ましい。本発明によって得られる熱可塑性樹脂
は、その使用にあたって、劣化防止、熱的安定性、成形
性、加工性などの観点から、フェノール系、ホスファイ
ト系、チオエーテル系等の抗酸化剤、脂肪族アルコー
ル、脂肪酸エステル、フタル酸エステル、トリグリセラ
イド類、フッ素系界面活性剤、高級脂肪酸金属塩等の離
型剤、その他滑剤、可塑剤、帯電防止剤、紫外線吸収
剤、難燃剤、重金属不活性化剤などを添加して使用して
もよい。The thermoplastic resin obtained by the present invention is
The molecular weight thereof is not particularly limited, but from the viewpoint of heat resistance and mechanical properties, the weight average molecular weight (polystyrene conversion) is preferably in the range of 10,000 to 1,000,000, and the range is particularly preferable. Preferred when used as a material. The thermoplastic resin obtained by the present invention is a phenol-based, phosphite-based, thioether-based antioxidant, aliphatic alcohol, etc. from the viewpoint of deterioration prevention, thermal stability, moldability, processability, etc. , Fatty acid esters, phthalic acid esters, triglycerides, fluorine-based surfactants, release agents such as higher fatty acid metal salts, other lubricants, plasticizers, antistatic agents, ultraviolet absorbers, flame retardants, heavy metal deactivators, etc. You may add and use it.
【００１２】[0012]
【実施例】以下、実施例により本発明を説明する。 〈懸濁剤：水溶性重合体（Ａ）（ポリメタクリル酸塩）
の合成〉メタクリル酸メチル５ｇ、メタクリル酸２−ヒ
ドロキシエチル１２ｇ、メタクリル酸カリウム２３ｇ及
び脱イオン水３６０ｇを内容積５００mlのセパラブルフ
ラスコに入れ、３０分間Ｎ2ガスを吹き込んで系内の空
気を除去した後、ウォーターバスで加熱して撹拌しつ
つ、系内温度を６５℃に昇温し、過硫酸カリウム０．０
６ｇを添加した。同温度で５時間重合を行い、続けて９
０℃に昇温して２時間撹拌を続けてゼリー状の水溶性重
合体（Ａ）を得た。The present invention will be described below with reference to examples. <Suspending agent: water-soluble polymer (A) (polymethacrylate)
Synthesis> Methyl methacrylate 5 g, 2-hydroxyethyl methacrylate 12 g, potassium methacrylate 23 g and deionized water 360 g were put in a separable flask with an internal volume of 500 ml, and N 2 gas was blown for 30 minutes to remove the air in the system. After that, while heating and stirring in a water bath, the temperature in the system was raised to 65 ° C., and potassium persulfate 0.0
6 g was added. Polymerization is carried out at the same temperature for 5 hours, then 9
The temperature was raised to 0 ° C. and stirring was continued for 2 hours to obtain a jelly-like water-soluble polymer (A).
【００１３】実施例１ メタクリル酸トリシクロ［５，２，１，０2,6］デカ−
８−イル（ＴＣＤＭＡ）２８０ｇ、スチレン（ＳＴ）９
８０ｇ、アクリロニトリル（ＡＮ）１４０ｇ、ラウロイ
ルパーオキサイド９．８ｇ、ｔ−ブチルパーオキシ２−
エチルヘキサノエート２．８ｇ及びｎ−オクチルメルカ
プタン１．４ｇを混合溶解してモノマー液とした。撹拌
機及びコンデンサを備えた５リットルセパラブルフラス
コに懸濁剤として前記したゼリー状の水溶性重合体０．
７ｇ、脱イオン水を１９６０ｇを加え撹拌し懸濁媒体と
した。ここに撹拌しながら下記組成物を加え、撹拌回転
数２８０rpm、窒素雰囲気下で６５℃４時間、８０℃２
時間、次いで１００℃で２時間重合させた（重合率９９
％（重量法））。合成した重合体粒子を水洗、脱水、乾
燥した。次に該重合粒子を射出成形し、得られた成形品
の光線透過率、屈折率、アツベ数、ガラス転移温度（耐
熱性の尺度）、染色性等を調べた。特性評価は下記の方
法に準拠した。Example 1 Tricyclo [5,2,1,0 2,6 ] decamethacrylate
280 g of 8-yl (TCDMA), styrene (ST) 9
80 g, acrylonitrile (AN) 140 g, lauroyl peroxide 9.8 g, t-butylperoxy 2-
2.8 g of ethyl hexanoate and 1.4 g of n-octyl mercaptan were mixed and dissolved to obtain a monomer liquid. In a 5 liter separable flask equipped with a stirrer and a condenser, the above-mentioned jelly-like water-soluble polymer as a suspending agent was added.
7 g and 1960 g of deionized water were added and stirred to obtain a suspension medium. While stirring, the following composition was added, and the stirring speed was 280 rpm, 65 ° C. for 4 hours under nitrogen atmosphere, and 80 ° C. for 2 hours.
Polymerization was carried out for 2 hours at 100 ° C (polymerization rate 99
% (By weight)). The synthesized polymer particles were washed with water, dehydrated and dried. Next, the polymerized particles were injection-molded, and the resulting molded article was examined for light transmittance, refractive index, Abbé number, glass transition temperature (heat resistance scale), dyeability and the like. The characteristic evaluation was based on the following methods.
【００１４】・光線透過率：ＡＳＴＭ Ｄ１００３に準
じ、測定した。 ・屈折率、アツベ数：アツベ屈折計（アタゴ社製）によ
り測定した。 ・ガラス転移温度：重合体を塩化メチレンに溶解した
後、メタノール中に撹拌下投入し、重合体を沈殿析出さ
せてろ別、乾燥し、白色粉末状の重合体を得た。これを
用いた示差走査熱量計（ＤＳＣ：パーキンエルマー社製
ＤＳＣ−７型）によりガラス転移温度（Ｔｇ）を測定し
た。 ・染色性：スミカロンブルーＥＢＬ（住友化学工業(株)
製）２ｇを１０００リットルの純水に溶解し染料浴を作
成した。成形品を８０℃とした前記染料浴に３０分間浸
漬し水洗後、染色性を観察した。Light transmittance: measured according to ASTM D1003. Refractive index and Atsube number: Measured with an Abebe refractometer (manufactured by Atago Co.). -Glass transition temperature: After dissolving the polymer in methylene chloride, the polymer was poured into methanol with stirring to precipitate and precipitate the polymer, which was filtered and dried to obtain a white powdery polymer. The glass transition temperature (Tg) was measured with a differential scanning calorimeter (DSC: DSC-7 type manufactured by Perkin Elmer Co., Ltd.) using this.・ Dyeability: Sumikaron Blue EBL (Sumitomo Chemical Co., Ltd.)
2g) was dissolved in 1000 liters of pure water to prepare a dye bath. The molded product was immersed in the dye bath at 80 ° C. for 30 minutes and washed with water, and the dyeability was observed.
【００１５】実施例２〜５ スチレン、アクリロニトリル及びメタクリル酸エステル
の組成（重量％）を種々変動させた以外は実施例１と同
様にして成形品を作成し、その物性を評価した。Examples 2 to 5 Molded articles were prepared in the same manner as in Example 1 except that the composition (% by weight) of styrene, acrylonitrile and methacrylic acid ester was varied, and the physical properties thereof were evaluated.
【００１６】比較例１〜４ メタクリル酸エステルを含まない単量体混合物、アクリ
ロニトリルを含まない単量体混合物、３成分系の組成
（重量％）を用いた以外は実施例１と同様にして成形品
を作成し、その物性を評価した。Comparative Examples 1 to 4 Molding in the same manner as in Example 1 except that a monomer mixture containing no methacrylic acid ester, a monomer mixture containing no acrylonitrile, and a three-component composition (% by weight) were used. A product was created and its physical properties were evaluated.
【００１７】実施例６、７ スチレン、アクリロニトリル、メタクリル酸エステルの
組成は実施例４と同様にして成形品を作成し、その物性
を評価した。Examples 6 and 7 The composition of styrene, acrylonitrile, and methacrylic acid ester was the same as in Example 4 to prepare molded articles, and the physical properties thereof were evaluated.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【表３】 [Table 3]
【００２１】[0021]
【発明の効果】本発明により得られる高屈折レンズは、
耐熱性、透明性及び染色性に優れ、眼鏡レンズ、その他
の光学レンズ等に特に有用である。The high refraction lens obtained by the present invention is
It has excellent heat resistance, transparency, and dyeability, and is particularly useful for spectacle lenses, other optical lenses, and the like.
Claims (2)
トリル１０〜２５重量％及びメタクリル酸トリシクロ
［５，２，１，０2,6］デカ−８−イル１０〜４０重量
％［総量で１００重量％］を重合して得られる熱可塑性
樹脂を含んでなる高屈折レンズ。1. 35 to 70% by weight of styrene, 10 to 25% by weight of acrylonitrile and 10 to 40% by weight of tricyclo [5,2,1,0 2,6 ] deca-8-yl methacrylate [total amount of 100% by weight. ] A high refractive lens comprising a thermoplastic resin obtained by polymerizing
以上及びレンズ染色性が良好である請求項１記載の高屈
折レンズ。2. A refractive index of 1.53 or more and an Abbé number of 35.
The high-refractive-index lens according to claim 1, which has the above-mentioned and good dyeability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28028195A JPH08208755A (en) | 1995-10-27 | 1995-10-27 | Highly refractive lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28028195A JPH08208755A (en) | 1995-10-27 | 1995-10-27 | Highly refractive lens |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2339165A Division JP2513081B2 (en) | 1990-11-30 | 1990-11-30 | Method for producing thermoplastic resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08208755A true JPH08208755A (en) | 1996-08-13 |
Family
ID=17622808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28028195A Pending JPH08208755A (en) | 1995-10-27 | 1995-10-27 | Highly refractive lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08208755A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0141610A2 (en) * | 1983-10-24 | 1985-05-15 | Hitachi Chemical Co., Ltd. | Optical elements comprising polymers of (meth)acrylate esters |
-
1995
- 1995-10-27 JP JP28028195A patent/JPH08208755A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0141610A2 (en) * | 1983-10-24 | 1985-05-15 | Hitachi Chemical Co., Ltd. | Optical elements comprising polymers of (meth)acrylate esters |
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