JP2002346432A - Method for classification of resin particles - Google Patents
Method for classification of resin particlesInfo
- Publication number
- JP2002346432A JP2002346432A JP2001154136A JP2001154136A JP2002346432A JP 2002346432 A JP2002346432 A JP 2002346432A JP 2001154136 A JP2001154136 A JP 2001154136A JP 2001154136 A JP2001154136 A JP 2001154136A JP 2002346432 A JP2002346432 A JP 2002346432A
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- Prior art keywords
- resin particles
- particles
- classification
- resin
- relatively large
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の背景】発明の分野 本発明は樹脂粒子の分級方法に関するものである。さら
に詳しくは、樹脂粒子を分散媒体中に分散させ、樹脂粒
子の表面電荷を利用して、相対的に粒子径の大きな樹脂
粒子のみを沈降させる方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for classifying resin particles. More specifically, the present invention relates to a method of dispersing resin particles in a dispersion medium and using a surface charge of the resin particles to precipitate only resin particles having a relatively large particle diameter.
【０００２】背景技術 分級とは、流体中に分散させた固体粒子群を、粒径の大
きさに応じた沈降速度の差を利用して、粒径または密度
の異なる２群またはそれ以上に分類する操作である。[0002] The background art classification, the solid particles dispersed in a fluid, by utilizing the difference in sedimentation rate corresponding to the magnitude of the particle size, classified into two different groups or more particle sizes or density Operation.
【０００３】一般に粒子の分級方法は、分級に先立って
粒子を分散浮遊させる媒体が気体であるか、液体である
かによって乾式分級方法と湿式分級方法とに大別され
る。乾式分級方法としては、一般的には篩い分け、風力
分級などの方法が挙げられ、湿式分級方法としては遠心
分離、ハイドロサイクロンなどが挙げられる。粒子を分
級しようとする場合、上記のような各種の分級方法か
ら、分級しようとする粒子の性状、大きさなどによって
選択される。[0003] In general, classification methods of particles are roughly classified into a dry classification method and a wet classification method depending on whether a medium for dispersing and suspending particles is a gas or a liquid prior to classification. The dry classification method generally includes methods such as sieving and air classification, and the wet classification method includes centrifugation, hydrocyclone, and the like. When the particles are to be classified, the method is selected from the various classification methods described above according to the properties and size of the particles to be classified.
【０００４】樹脂材料は必要に応じて板状、ペレット、
粉体など、各種の形状で供給される。中でも粉体の樹脂
材料は成型機械などで利用するのに有利な場合があり、
市場においては粒子径の揃った粉体状樹脂のニーズがあ
る。しかし、従来の方法では、大型の装置が必要になっ
たり、分級効率が悪かったり、分級精度が悪い、などの
問題があり、粒子径の揃った樹脂を得ることが困難であ
った。具体的には、風力分級法では、風力で装置壁面な
どに衝突した粒子が変形または凝集することがあり、篩
い分け法では篩の目詰まりが起こることがあり、遠心分
離法では大型の装置が必要であった。[0004] The resin material may be in the form of a plate, a pellet,
It is supplied in various forms, such as powder. Above all, powdered resin materials may be advantageous for use in molding machines, etc.
There is a need in the market for powdery resins having a uniform particle size. However, the conventional method has problems such as the necessity of a large-sized apparatus, poor classification efficiency, and poor classification accuracy, and it has been difficult to obtain a resin having a uniform particle diameter. Specifically, in the air classification method, particles that have collided with the wall of the device due to the wind force may be deformed or aggregated.In the sieving method, clogging of the sieve may occur. Was needed.
【０００５】[0005]
【発明の概要】本発明は、前記のような問題点を解決
し、大型装置を必要とせず、分級効率および分級精度の
すぐれた分級方法を提供するものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a classification method which does not require a large-sized apparatus and has excellent classification efficiency and classification accuracy.
【０００６】本発明による樹脂粒子の分級方法は、樹脂
粒子を極性溶媒中に分散させ、静置して、電荷を有する
樹脂粒子の表面と極性溶媒との相互作用を利用して、相
対的に粒子径の大きな樹脂粒子のみを沈降させることに
より、相対的に粒子径の大きな樹脂粒子のみを含む沈殿
相と、相対的に小さい粒子径を有する上澄み相とに分離
させることにより、樹脂粒子を相対的に大きな樹脂粒子
と相対的に小さな樹脂粒子とに分級することを特徴とす
るものである。In the method for classifying resin particles according to the present invention, the resin particles are dispersed in a polar solvent and allowed to stand, and the particles are relatively allowed to interact with each other by utilizing the interaction between the surface of the charged resin particles and the polar solvent. By sedimenting only the resin particles having a large particle diameter, the resin phase is separated into a precipitate phase containing only the resin particles having a relatively large particle diameter and a supernatant phase having a relatively small particle diameter. It is characterized in that it is classified into relatively large resin particles and relatively small resin particles.
【０００７】[0007]
【発明の具体的説明】１． 樹脂粒子 本発明による分級方法では、樹脂粒子の表面と分散媒体
との界面における電気二重層の寄与による、樹脂粒子表
面と分散媒体との相互作用を利用している。このため、
本発明による分級方法により分級できる樹脂粒子は、液
体媒体に分散させたときに表面電荷を有するものであれ
ば特に限定されない。ポリベンゾイミダゾール、ポリビ
ニルアルコール、ポリビニルピロリドン、ポリイミドが
好ましく、ポリベンゾイミダゾールが特に好ましい。こ
れらの樹脂粒子は、例えば無機酸水溶液中で表面に正電
荷を有するものである。DETAILED DESCRIPTION OF THE INVENTION Resin Particles The classification method according to the present invention utilizes the interaction between the resin particle surface and the dispersion medium due to the contribution of the electric double layer at the interface between the surface of the resin particles and the dispersion medium. For this reason,
The resin particles that can be classified by the classification method according to the present invention are not particularly limited as long as they have a surface charge when dispersed in a liquid medium. Polybenzimidazole, polyvinyl alcohol, polyvinylpyrrolidone and polyimide are preferred, and polybenzimidazole is particularly preferred. These resin particles have a positive charge on the surface in, for example, an aqueous solution of an inorganic acid.
【０００８】分級される樹脂粒子の範囲は特に限定され
ないが、分級効率などの観点から、平均粒径で一般に0.
1〜5000μｍ、好ましくは１〜2000μｍ、の樹脂粒子を
用いることができる。なお、本発明において、粒子径と
はレーザー光散乱法により測定した粒子径である。具体
的にはパーティクルアナライザーLA-700（ホリバ社製）
により測定することができる。また、本発明による方法
において、分布を有する粒子が特定の粒子径を境界とし
て、相対的に大きな粒子と小さな粒子とに分級される
が、その境となる粒子径は、好ましくは１〜５００μ
ｍ、である。[0008] The range of the resin particles to be classified is not particularly limited, but from the viewpoint of classification efficiency and the like, the average particle diameter is generally 0.1.
Resin particles of 1 to 5000 μm, preferably 1 to 2000 μm can be used. In the present invention, the particle diameter is a particle diameter measured by a laser light scattering method. Specifically, Particle Analyzer LA-700 (manufactured by Horiba)
Can be measured. In the method according to the present invention, particles having a distribution are classified into relatively large particles and small particles with a specific particle diameter as a boundary, and the particle diameter at the boundary is preferably 1 to 500 μm.
m.
【０００９】２． 極性溶媒 本発明による分級方法において、前記樹脂粒子を分散さ
せる分散媒体は極性溶媒から選択される。そのような極
性溶媒として具体的には、（１）水、（２）酸水溶液、
例えば塩酸、硝酸、硫酸、リン酸、カルボン酸、および
スルホン酸、（３）無機塩基水溶液、例えばアンモニ
ア、水酸化ナトリウム、（４）アルコール、例えばメタ
ノール、エタノール、ブタノール、およびイソプロピル
アルコール、（５）ケトン、例えばアセトン、メチルエ
チルケトン、ジメチルケトン、およびメチルイソブチル
ケトン、（６）エーテル、例えばジオキサン、などが挙
げられる。これらの２種類以上を組み合わせて用いるこ
ともできる。[0009] 2. Polar Solvent In the classification method according to the present invention, the dispersion medium in which the resin particles are dispersed is selected from polar solvents. Specific examples of such a polar solvent include (1) water, (2) an aqueous acid solution,
For example, hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, carboxylic acid, and sulfonic acid, (3) aqueous inorganic base solution such as ammonia, sodium hydroxide, (4) alcohol such as methanol, ethanol, butanol, and isopropyl alcohol; Ketones such as acetone, methyl ethyl ketone, dimethyl ketone, and methyl isobutyl ketone, (6) ethers such as dioxane, and the like. Two or more of these can be used in combination.
【００１０】前記したような極性溶媒は分散媒体として
任意に使用することができるが、樹脂粒子の性質に応じ
て選択されるべきである。樹脂粒子を溶解したり、樹脂
と反応する極性溶媒は選択すべきではない。また、樹脂
粒子の性質に応じて分散媒体を選択することによって、
さらに分級効率を改善することができる。従って、好ま
しい極性溶媒は樹脂粒子によって異なる。例えば、ポリ
ベンゾイミダゾールの樹脂粒子を分級しようとする場
合、樹脂が溶媒によって変性されず、また分級効率が優
れているという点から、極性溶媒として、水または水溶
液を用いることが好ましく、無機酸水溶液を用いること
がより好ましく、塩酸を用いることが特に好ましい。水
または水溶液は、分級後の粒子を容易に洗浄できる点で
も有利である。The above-mentioned polar solvent can be used arbitrarily as a dispersion medium, but should be selected according to the properties of the resin particles. Polar solvents that dissolve the resin particles or react with the resin should not be selected. Also, by selecting a dispersion medium according to the properties of the resin particles,
Further, the classification efficiency can be improved. Therefore, the preferred polar solvent varies depending on the resin particles. For example, when classifying resin particles of polybenzimidazole, it is preferable to use water or an aqueous solution as a polar solvent from the viewpoint that the resin is not modified by a solvent and the classification efficiency is excellent, and an inorganic acid aqueous solution is used. Is more preferable, and it is particularly preferable to use hydrochloric acid. Water or an aqueous solution is also advantageous in that particles after classification can be easily washed.
【００１１】３． 分級方法 本発明による分級方法は、前記樹脂粒子を前記分散媒体
中に分散させ、静置することによって、相対的に大きな
粒子と、相対的に小さな粒子とに分離させ、樹脂粒子を
分級するものである。粒子を沈降させるには重力を利用
している。また、樹脂粒子の表面電荷と極性溶媒との相
互作用を損なわない範囲で、遠心分離器などによって粒
子を沈降させるための力や速度を制御することも可能で
ある。3. Classification method The classification method according to the present invention classifies resin particles by dispersing the resin particles in the dispersion medium and allowing the resin particles to stand still to separate them into relatively large particles and relatively small particles. It is. Gravity is used to settle the particles. Further, it is also possible to control the force and speed for sedimenting the particles by a centrifugal separator or the like as long as the interaction between the surface charge of the resin particles and the polar solvent is not impaired.
【００１２】まず、樹脂粒子を分散媒体に分散させる。
樹脂粒子と分散媒体との比率は必ずしも限定されない
が、分級効率と分級精度の観点から、樹脂／分散媒体の
重量比で一般に１／２〜１／１００、好ましくは１／５
〜１／２０、である。First, resin particles are dispersed in a dispersion medium.
Although the ratio between the resin particles and the dispersion medium is not necessarily limited, from the viewpoint of classification efficiency and classification accuracy, the weight ratio of the resin / dispersion medium is generally 1/2 to 1/100, preferably 1/5.
~ 1/20.
【００１３】樹脂粒子を分散媒体に分散させる方法は任
意である。通常は樹脂粒子を分散媒体中に投入し、撹
拌、超音波印加などにより分散させる。The method for dispersing the resin particles in the dispersion medium is arbitrary. Usually, resin particles are put into a dispersion medium and dispersed by stirring, application of ultrasonic waves, or the like.
【００１４】樹脂粒子を分散させた後、分散物を静置す
ることにより、相対的に大きな樹脂粒子は沈降し、相対
的に小さな樹脂粒子は媒体中に分散したままとなって、
樹脂粒子が分級される。このメカニズムは以下のような
ものであると推測されている。After dispersing the resin particles, the dispersion is allowed to stand, whereby relatively large resin particles settle, and relatively small resin particles remain dispersed in the medium.
The resin particles are classified. This mechanism is presumed to be as follows.
【００１５】分散媒体中に分散された樹脂粒子には、重
力の他、ファンデルワールス力、電気二重層の重なりに
よる反発力などが作用している。樹脂粒子の密度が分散
媒体の密度より大きければ、重力の作用により樹脂粒子
は沈降しようとする。これは樹脂粒子の大きさには依存
しない。一方、樹脂粒子と分散媒体の界面において、樹
脂粒子の表面電荷と逆の極性であるイオンが、分散媒体
相の界面近傍に集まり、電気二重層が形成される。この
電気二重層による反発力が沈降を妨げる力として作用す
る。この反発力は表面積に依存するため、単位質量あた
りに作用する反発力は、相対的に粒子径の小さい粒子で
大きくなる。このため、相対的に粒子径の小さい樹脂粒
子が沈降しにくくなる。すなわち、本発明による分級方
法は、重力だけを利用して、単に大きい、すなわち重い
粒子が早く沈降することを利用したものではなく、さら
に表面電荷を有する粒子と、極性溶媒との間の相互作用
をも組み合わせたものである。The resin particles dispersed in the dispersion medium are subjected to a gravity, a van der Waals force, a repulsive force due to the overlap of the electric double layers, and the like. If the density of the resin particles is higher than the density of the dispersion medium, the resin particles tend to settle by the action of gravity. This does not depend on the size of the resin particles. On the other hand, at the interface between the resin particles and the dispersion medium, ions having a polarity opposite to the surface charge of the resin particles gather near the interface of the dispersion medium phase, and an electric double layer is formed. The repulsive force of the electric double layer acts as a force that prevents sedimentation. Since this repulsive force depends on the surface area, the repulsive force acting per unit mass increases for particles having a relatively small particle diameter. For this reason, resin particles having a relatively small particle diameter are less likely to settle. In other words, the classification method according to the present invention does not use only gravity, that is, not only that large particles, that is, heavy particles settle quickly, but also the interaction between particles having a surface charge and a polar solvent. Is also combined.
【００１６】相対的に大きな粒子が十分に沈降するのに
必要な時間は樹脂粒子の種類、分散媒体の種類などに加
え、温度などの各種の条件によって変動する。しかしな
がら、分級の精度を損なわない範囲で、沈降に要する時
間は短い方が好ましい。従って、分級する樹脂粒子が決
まっている場合、沈降に要する時間が適当になるよう、
分散媒体の種類、温度などを調整するのが一般的であ
る。The time required for sufficiently large particles to settle varies depending on various conditions such as temperature, in addition to the type of resin particles and the type of dispersion medium. However, as long as the accuracy of classification is not impaired, the time required for sedimentation is preferably short. Therefore, if the resin particles to be classified are determined, so that the time required for sedimentation becomes appropriate,
Generally, the type, temperature, etc. of the dispersion medium are adjusted.
【００１７】例えば、数ミクロン〜数十ミクロンのポリ
ベンゾイミダゾール樹脂粒子を分級しようとする場合、
常温において、分散媒体として１〜２０％の塩酸を用い
ることが好ましい。このような条件で分級を行うと、沈
殿相が明確に分離されるのに、すなわち精度よく分級さ
れるのに要する時間が通常５分〜３時間となる。また、
塩酸の濃度を調整することによって、分級サイズを調整
することができ、塩酸濃度を高くすることで、より大き
な粒子を分散させることができる。For example, when classifying polybenzimidazole resin particles of several microns to several tens of microns,
At room temperature, it is preferable to use 1 to 20% hydrochloric acid as a dispersion medium. When the classification is performed under such conditions, the time required for clearly separating the precipitated phase, that is, the time required for accurate classification is usually 5 minutes to 3 hours. Also,
By adjusting the concentration of hydrochloric acid, the classification size can be adjusted, and by increasing the concentration of hydrochloric acid, larger particles can be dispersed.
【００１８】このように分離させたあと、沈殿物および
上澄みからそれぞれ相対的に粒子径の大きな樹脂粒子と
小さな樹脂粒子とが得られる。沈殿相と上澄み相とを分
別する方法は任意であり、いずれの方法を用いてもよ
い。例えば、上澄み相をデカンテーション法で分け取る
方法、上澄み相のみを吸引して分け取る方法、容器底部
に弁を設けておき、沈殿相のみを抜き取る方法などが挙
げられる。After the separation, resin particles having a relatively large particle diameter and resin particles having a relatively small particle diameter are obtained from the precipitate and the supernatant, respectively. The method of separating the precipitation phase and the supernatant phase is arbitrary, and any method may be used. Examples of the method include a method of separating the supernatant phase by a decantation method, a method of suctioning and separating only the supernatant phase, and a method of providing a valve at the bottom of the container and extracting only the precipitate phase.
【００１９】分別された沈殿を、必要に応じて洗浄し、
乾燥することによって、相対的に粒子径の大きな粒子が
得られる。また、上澄み相を濾過あるいは濃縮すること
により、相対的に粒子径の小さい樹脂粒子が得られる。The separated precipitate is optionally washed,
By drying, particles having a relatively large particle diameter can be obtained. By filtering or concentrating the supernatant phase, resin particles having a relatively small particle size can be obtained.
【００２０】[0020]
【実施例】実施例１ 粒子径が１〜３００μｍに分布しているポリベンゾイミ
ダゾールの粉末１０ｇを、８％塩酸水溶液に投入し、撹
拌機によって撹拌して、ポリベンゾイミダゾール粒子を
分散させた後、撹拌を停止して１時間静置した。静置に
より、相対的に大きい粒子は沈降して沈殿となり、相対
的に小さい粒子は媒体である塩酸水溶液中に分散したま
まになる。 Example 1 10 g of polybenzimidazole powder having a particle diameter of 1 to 300 μm was poured into an 8% hydrochloric acid aqueous solution and stirred with a stirrer to disperse the polybenzimidazole particles. Then, stirring was stopped and the mixture was allowed to stand for 1 hour. Upon standing, the relatively large particles settle out and settle out, while the relatively small particles remain dispersed in the aqueous hydrochloric acid solution.
【００２１】このように２相に分離した後、デカンテー
ション法により沈殿相と上澄み相とに分割した。沈殿相
を集めて乾燥したところ、粒子径が２０μｍ以上の粒子
が得られた。また、上澄み相を濾布によって濾過し、乾
燥することにより粒子径が２０μｍ未満の粒子が得られ
た。After separation into two phases in this way, the mixture was separated into a precipitate phase and a supernatant phase by a decantation method. When the precipitated phase was collected and dried, particles having a particle diameter of 20 μm or more were obtained. The supernatant phase was filtered with a filter cloth and dried to obtain particles having a particle diameter of less than 20 μm.
【００２２】実施例２ ８％塩酸水溶液を４％塩酸水溶液に変更した他は、実施
例１と同様の分級を行った。 Example 2 The same classification as in Example 1 was performed except that the 8% aqueous hydrochloric acid solution was changed to a 4% aqueous hydrochloric acid solution.
【００２３】デカンテーション法により分割した後、沈
殿相から、粒子径が１０μｍ以上の粒子が得られた。ま
た、上澄み相からは粒子径が１０μｍ未満の粒子が得ら
れた。After separation by the decantation method, particles having a particle size of 10 μm or more were obtained from the precipitate phase. Further, particles having a particle diameter of less than 10 μm were obtained from the supernatant phase.
【００２４】実施例３ ８％塩酸水溶液を８％アンモニア水溶液に変更した他
は、実施例１と同様の分級を行った。 Example 3 The same classification as in Example 1 was performed except that the 8% aqueous hydrochloric acid solution was changed to an 8% aqueous ammonia solution.
【００２５】デカンテーション法により分割した後、沈
殿相から、粒子径が１０μｍ以上の粒子が得られた。ま
た、上澄み相からは粒子径が１０μｍ未満の粒子が得ら
れた。After separation by the decantation method, particles having a particle diameter of 10 μm or more were obtained from the precipitate phase. Further, particles having a particle diameter of less than 10 μm were obtained from the supernatant phase.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 相 澤 雅 美 東京都文京区本駒込二丁目28番８号 文京 グリーンコート センターオフィス９階 クラリアントジャパン株式会社内 Ｆターム(参考） 4D071 AA43 AA62 AB15 AB19 BB12 DA20 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masami Aizawa 2-28-8 Honkomagome, Bunkyo-ku, Tokyo Bunkyo Green Court Center Office 9th floor Clariant Japan Co., Ltd. F term (reference) 4D071 AA43 AA62 AB15 AB19 BB12 DA20
Claims (8)
子の表面と極性溶媒との相互作用を利用して、相対的に
粒子径の大きな樹脂粒子のみを沈降させることにより、
相対的に粒子径の大きな樹脂粒子のみを含む沈殿相と、
相対的に小さい粒子径を有する上澄み相とに分離させる
ことにより、樹脂粒子を相対的に大きな樹脂粒子と相対
的に小さな樹脂粒子とに分級することを特徴とする、分
級方法。1. A method for classifying resin particles, comprising dispersing the resin particles in a polar solvent and utilizing the interaction between the surface of the charged resin particles and the polar solvent to obtain a relatively large particle diameter. By sedimenting only the resin particles,
A precipitation phase containing only relatively large resin particles,
A classification method characterized by classifying resin particles into relatively large resin particles and relatively small resin particles by separating into a supernatant phase having a relatively small particle diameter.
リビニルアルコール、ポリビニルピロリドン、およびポ
リイミドからなる群から選択される、請求項１に記載の
分級方法。2. The classification method according to claim 1, wherein the resin particles are selected from the group consisting of polybenzimidazole, polyvinyl alcohol, polyvinylpyrrolidone, and polyimide.
る、請求項２に記載の分級方法。3. The classification method according to claim 2, wherein the resin particles are polybenzimidazole.
〜5000μｍである、請求項１〜３のいずれか１項に記載
の分級方法。4. The resin particle to be classified has a particle size in a range of 0.1 to 0.1.
The classification method according to any one of claims 1 to 3, wherein the particle size is 50005000 μm.
項１〜４のいずれか１項に記載の分級方法。5. The classification method according to claim 1, wherein the polar solvent is water or an aqueous solution.
載の分級方法。6. The classification method according to claim 5, wherein the polar solvent is an aqueous acid solution.
分級方法。7. The classification method according to claim 5, wherein the polar solvent is hydrochloric acid.
中に分散させ、相対的に粒子径の大きな粒子のみを沈降
させることによって、相対的に粒子径の大きな樹脂粒子
のみを含む沈殿相と、相対的に小さい粒子径を有する上
澄み相とに分離させることにより、樹脂粒子を相対的に
大きな樹脂粒子と相対的に小さな樹脂粒子とに分級する
方法であって、塩酸の濃度を調整することによって、沈
降するポリベンゾイミダゾール樹脂の大きさを制御する
ことを特徴とする、ポリベンゾイミダゾール樹脂の分級
方法。8. A polybenzimidazole resin particle is dispersed in hydrochloric acid, and only particles having a relatively large particle diameter are precipitated, whereby a precipitation phase containing only resin particles having a relatively large particle diameter is formed. A method of classifying resin particles into relatively large resin particles and relatively small resin particles by separating into a supernatant phase having a relatively small particle diameter, by adjusting the concentration of hydrochloric acid, A method for classifying a polybenzimidazole resin, comprising controlling the size of the polybenzimidazole resin that precipitates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001154136A JP2002346432A (en) | 2001-05-23 | 2001-05-23 | Method for classification of resin particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001154136A JP2002346432A (en) | 2001-05-23 | 2001-05-23 | Method for classification of resin particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002346432A true JP2002346432A (en) | 2002-12-03 |
| JP2002346432A5 JP2002346432A5 (en) | 2008-01-31 |
Family
ID=18998532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001154136A Pending JP2002346432A (en) | 2001-05-23 | 2001-05-23 | Method for classification of resin particles |
Country Status (1)
| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262160A (en) * | 2006-03-27 | 2007-10-11 | Osaka Prefecture | Microparticle of polyimidazole or its precursor and method for producing the microparticle |
| JP2008163261A (en) * | 2006-12-28 | 2008-07-17 | Az Electronic Materials Kk | Poly benzimidazole coating composition |
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| JPH01254268A (en) * | 1988-03-31 | 1989-10-11 | Kanebo Ltd | Purification of whisker |
| JPH03178352A (en) * | 1989-12-05 | 1991-08-02 | Kurita Water Ind Ltd | Wet gravitational classification method |
| JPH08290427A (en) * | 1995-02-24 | 1996-11-05 | Honda Motor Co Ltd | Separation of resin and coating film and apparatus for separating and recovering resin and coating film |
| JPH11156229A (en) * | 1997-11-20 | 1999-06-15 | Nippon Micro Coating Kk | Wet type powder classifier |
| JP2000262922A (en) * | 1999-03-18 | 2000-09-26 | Sekisui Chem Co Ltd | Wet type classifying device |
| JP2001087673A (en) * | 1999-09-21 | 2001-04-03 | Sekisui Chem Co Ltd | Wet classification device and wet classification method |
| JP2002028527A (en) * | 2000-07-19 | 2002-01-29 | Dainippon Ink & Chem Inc | Method for removing fine powder contained in powder |
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2001
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01254268A (en) * | 1988-03-31 | 1989-10-11 | Kanebo Ltd | Purification of whisker |
| JPH03178352A (en) * | 1989-12-05 | 1991-08-02 | Kurita Water Ind Ltd | Wet gravitational classification method |
| JPH08290427A (en) * | 1995-02-24 | 1996-11-05 | Honda Motor Co Ltd | Separation of resin and coating film and apparatus for separating and recovering resin and coating film |
| JPH11156229A (en) * | 1997-11-20 | 1999-06-15 | Nippon Micro Coating Kk | Wet type powder classifier |
| JP2000262922A (en) * | 1999-03-18 | 2000-09-26 | Sekisui Chem Co Ltd | Wet type classifying device |
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| JP2002028527A (en) * | 2000-07-19 | 2002-01-29 | Dainippon Ink & Chem Inc | Method for removing fine powder contained in powder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262160A (en) * | 2006-03-27 | 2007-10-11 | Osaka Prefecture | Microparticle of polyimidazole or its precursor and method for producing the microparticle |
| JP2008163261A (en) * | 2006-12-28 | 2008-07-17 | Az Electronic Materials Kk | Poly benzimidazole coating composition |
| JP4516061B2 (en) * | 2006-12-28 | 2010-08-04 | 株式会社Ｐｂｉアドバンストマテリアルズ | Polybenzimidazole coating composition |
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