JP4070402B2 - Low substituted hydroxypropylcellulose and process for producing the same - Google Patents

Low substituted hydroxypropylcellulose and process for producing the same Download PDF

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JP4070402B2
JP4070402B2 JP2000339848A JP2000339848A JP4070402B2 JP 4070402 B2 JP4070402 B2 JP 4070402B2 JP 2000339848 A JP2000339848 A JP 2000339848A JP 2000339848 A JP2000339848 A JP 2000339848A JP 4070402 B2 JP4070402 B2 JP 4070402B2
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JP2001200001A (en
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栄 尾原
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Shin Etsu Chemical Co Ltd
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Shin Etsu Chemical Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、医薬用、農薬用、食品用の添加剤として用いられる低置換度ヒドロキシプロピルセルロースとそれを含有する固形製剤及びそれらの製造方法に関するものである。
【0002】
【従来の技術】
医薬用、農薬用、食品用、その他の工業用に錠剤、顆粒剤などの固形製剤が用いられているが、これらは一般に主薬と賦形剤や崩壊剤、結合剤などの添加剤を混合して打錠したり、それらの混合物に水や結合剤を添加して攪拌又は練合した後、製粒することにより顆粒剤や細粒剤などの剤形で用いられている。
そして、これらの固形製剤には崩壊剤兼結合剤として日本薬局方に収載されている低置換度ヒドロキシプロピルセルロース(以下、「L−HPC」ともいう。)が用いられる(特公昭48−38858号公報、特公昭51−19017号公報、特公昭57−53100号公報、特開平7−324101号公報)。
【0003】
L−HPCは、セルロースエーテルの一種であり、結合剤として汎用されるヒドロキシプロピルセルロース(以下、「HPC」ともいう。)と類似するが、その性質を異にする。すなわち、HPCとL−HPCの本質的な違いは、L−HPCのヒドロキシプロポキシル基含量にあり、その値はHPCで53.4〜77.5%であるのに対し、L−HPCでは5〜16%である。この値は日本薬局方に収載されている方法で測定し、その範囲は日本薬局方「低置換度ヒドロキシプロピルセルロース」のモノグラフで明確に規定されている。
【0004】
しかしながら、従来L−HPCとして市販されているものは、ゆるみ嵩密度が0.3g/ml程度で粉体の流動性に乏しいことから、以下のような問題を生じていた。まず、流動層造粒により顆粒を調製する場合、L−HPCが有する粉体特性より顆粒の嵩密度が低く流動性が低いものとなってしまう。そして、この顆粒をハードカプセルに充填してカプセル剤とすると所望の用量を充填できなくなってしまう。また、顆粒を打錠して錠剤を製造するプロセスにおいて、高速で打錠するとその嵩高さや流動性の悪さから錠剤の重量偏差が大きくなる。
さらに、根本的な問題としてL−HPCの添加量が特に多い場合、流動層造粒そのものが困難になる。これは造粒中の粉体が吸水膨潤して嵩が増えて、流動が停止してしまうか或いは不良になって粒度分布がかなり不均一なものとなってしまうということによるものである。
そして、L−HPCを添加した製剤は、口に含んだ場合に舌触りが不良であるという問題もあった。
【0005】
【発明が解決しようとする課題】
本発明は、顆粒を重質なものとし流動性に富ませ、ハードカプセルに充填する場合に用量を高くでき、高速打錠時に重量偏差が少なくするとともに、得られた製剤の舌触りが改善され、流動層造粒を行う場合の流動停止などの問題を減少させる低置換度ヒドロキシプロピルセルロースと、それを含む固形製剤及びそれらの製造方法を提供することを目的とする。
【0006】
【課題を解決するための手段】
本発明者らは、上記課題の解決のために鋭意検討した結果、第1粉砕工程後のゆるめ嵩密度が0.40g/ml以上であり、かつ固め嵩密度が0.60g/ml以上である低置換度ヒドロキシプロピルセルロースをさらに粉砕した低置換度ヒドロキシプロピルセルロースを使用することにより、流動性や舌触りが改善され、高速打錠時に重量偏差が少なくするとともに、流動層造粒を行う場合の流動停止などの問題を減少させ、直接打錠の場合にL−HPCの含有量を高めても重量偏差の問題が少なくすることができることを見出し本発明をなすに至ったものである。
即ち、パルプをアルカリ溶液に浸漬してアルカリセルロースを調製する工程と、該アルカリセルロースを酸化プロピレン等のヒドロキシプロピル化剤と反応させ、その生成物を完全溶解状態とする工程と、酸で中和して晶出させる工程と、洗浄工程と、乾燥工程と、乾式レーザー回折法により測定される体積平均粒子径が25ミクロン未満、ゆるめ嵩密度が0.29g/ml以上0.40g/ml未満であり、かつ固め嵩密度が0.55g/ml以上である粉砕物を得るための二段階で行われる粉砕工程とを含む低置換度ヒドロキシプロピルセルロースの製造方法及び低置換度ヒドロキシプロピルセルロースを提供する。また、低置換度ヒドロキシプロピルセルロースを含有する固形製剤を提供する。
【0007】
【発明の実施の形態】
本発明でいう「ゆるめ嵩密度」とは、疎充填の状態の嵩密度をいい、直径5.03cm、高さ5.03cm(容積100ml)の円筒容器へ試料をJISの22メッシュ(710μm)の篩いを通して、容器の23cm上方から均一に供給し、上面をすり切って秤量することによって測定される。
一方、「固め嵩密度」とは、これにタッピングを加えて密充填にした場合の嵩密度である。タッピングとは、試料を充填した容器を一定の高さから繰り返し落下させて底部に軽い衝撃を与え、試料を密充填にする操作である。実際には、ゆるみ嵩密度を測定する際上面をすり切って秤量した後、さらにこの容器の上にホソカワミクロン社製パウダーテスターの備品であるキャップをはめ、この上縁まで粉体を加えてタップ高さ1.8cmのタッピングを180回行う。終了後、キャップを外して容器の上面で粉体をすり切って、秤量し、この状態の嵩密度を固めかさ密度とする。これらの操作は、ホソカワミクロン社製パウダーテスター(PT−D)を使用することにより測定できる。
【0008】
本発明のL−HPCは、以下に示す方法により製造できる。
まず、パルプをアルカリ溶液に浸漬してアルカリセルロースとし、これを酸化プロピレンなどのヒドロキシプロピル化剤と反応させる。この段階までは従来のL−HPCの製法と同じであるが、この後の工程において生成物を水又はアルカリ性に調節した水に投入して溶解させ、ほとんど均一な不透明なスラリー状にしてから塩酸で中和して析出されたL−HPCを回収後、水で洗浄し乾燥して粉砕する。
従来法では、部分的に中和を行い溶解を不完全とさせて半溶解状態とし、この状態をコントロールすることにより繊維分率を変えて嵩密度を調節するが、本発明では生成物を完全溶解状態にすることにより、目的のL−HPCが得られる。
ここでいう完全溶解状態とは、生成物がその形状をほぼ完全に失う状態を意味する。すなわち、完全に透明になることはもとより、不透明のスラリー状態や3リットルのスラリー中に5〜10個の割合で生成物小魂の残留が認められる程度も含む。溶解した後の状態は高粘性のスラリー状であり、ニーダーなどの撹拌力の強い練合機が必要である。この後は、従来法通り塩酸等の酸で中和することによりL−HPCが析出し、この物を回収して洗浄、乾燥、粉砕して製品とする。
なお、生成物を完全溶解させるためにはアルカリセルロースの調製条件が影響し、特に浸漬用アルカリ溶液が濃度45重量%以下の水酸化ナトリウムのときに完全溶解状態となりやすいことを見出した。従来は49重量%の水酸化ナトリウム溶液を用いて行っていたが、その濃度を下げることにより、反応の均一性が増して溶解性が向上したためと考えられる。
【0009】
粉砕工程は、2段階により行われ、第1粉砕により得られる中間物のゆるめ嵩密度が0.40g/ml以上で、かつ固め嵩密度が0.60g/ml以上のL−HPCであることが好ましい。このように再粉砕する際に、特定の嵩密度のL−HPCを用いることにより、最終的に得られるL−HPCの顆粒が重質なものとなって流動性に富み、ハードカプセルに充填する場合に用量を高くでき、高速打錠時に重量偏差が少なくなる一方、得られた製剤の舌触りが改善される。
また、流動層造粒を行う場合に流動停止などの問題が減少し、直接打錠の場合はL−HPCの含有量を高めても重量偏差の問題が少なくなる。
第1粉砕により得られる中間物の体積平均粒径は、特に制限されないが、粉砕能力などの理由より、乾式レーザー回折法による体積平均粒径が30ミクロン以上であることが好ましい。
第1粉砕工程は、ボールミル、ハンマーミル、ナイフミルなどの粉砕機を用いて、第2粉砕工程は、ジェットミルなどの微粉砕機を用いて行うことができる。
【0010】
このような方法で得られたL−HPCは従来のものよりも重質なものとなり、特に乾式レーザー回折法による体積平均粒子径が25ミクロン未満、ゆるめ嵩密度が0.29g/ml以上0.40g/ml未満であり、かつ固め嵩密度が0.55g/ml以上の場合には、特に流動層造粒による造粒物が良質のものとなるので好ましい。
なお、本発明でいう乾式レーザー回折法とは、例えばドイツSympatec社のHELOS装置を用いた方法のように、圧縮空気で粉体サンプルを噴出させたものにレーザー光を照射し、その回折強度により体積平均径を測定する方法をいう。体積平均粒径は、例えば「改訂増補粉体物性図説」粉体工学会・日本粉体工業技術協会編、日経技術図書、1985年、第88頁に記載されているように、式{Σ(nD3)/Σn}1/3を用いて計算される。式中、Dは粒子の直径、nはその直径の粒子数、Σnは全粒子数を表す。
なお、本発明は、最終的に目的とする低置換度ヒドロキシプロピルセルロースを得ることができるならば、上記の2段階の粉砕工程からなる好適な態様に限定されことはなく、他の2段階の粉砕工程、または1段階の粉砕工程であってもよい。但し、2段階で粉砕する場合には、1段階目の粉砕物の品質を管理することができるので、最終製品の品質が安定し、粉砕機に負担がかかりにくいなどのメリットがある。
【0011】
本発明における固形製剤は、錠剤、顆粒剤、細粒剤、カプセル剤などをいう。これらの固形製剤の製造方法については、直接打錠、湿式打錠、乾式造粒、流動層造粒などいずれの方法も適用される。
直接打錠は、主薬と添加剤を混合してそのまま打錠するものであり、湿式打錠は、主薬と添加剤の混合物を結合剤溶液や水等の適当な溶媒と練合して造粒し、これを乾燥した後で打錠するものである。後者は主薬や添加物の粉体の流動性が悪い場合にその流動性を高める目的で行われる。
乾式造粒は、主薬が水の存在下で不安定な場合、主薬と添加剤を混合してロール混合機などで圧縮し、それを粉砕、整粒して製する。また、顆粒剤や細粒剤は湿式あるいは乾式造粒したものをそのまま用いるか、あるいは主薬と添加剤の混合物を水または結合剤溶液で練合したものをスクリーンで押し出し成形したのち粉砕、整粒して製する。また、カプセル剤は、顆粒や細粒をゼラチンやセルロース誘導体を材質としたハードカプセルに充填して製する。
錠剤または顆粒剤や細粒剤の湿式造粒法における主な造粒プロセスには、高速撹拌機を使用する撹拌造粒と流動層を使用する流動層造粒がある。
ここで、流動層造粒は、撹拌造粒に比較して造粒物の粒度分布が狭く、また、工程管理が行いやすい点で近年好んで行われているが、流動層造粒に従来のL−HPCを使用すると、非常に嵩高い造粒物となってしまい、流動性に劣るため打錠機のホッパーから流出せずに打錠が不可能であったり、あるいは錠剤の重量偏差が著しく大きくなってしまう。しかし、本発明のL−HPCは、流動層造粒にも対応できることを特徴とする。
【0012】
これらの固形製剤に含有されるL−HPCの量は、主成分の添加量と性質により適宜決められる。
また、固形製剤に加える主成分も、医薬品であれば解熱鎮痛剤、抗生物質、抗炎症剤、食品であればビタミンや栄養物、その他農薬や洗剤など特に限定はされず、また他の添加剤である崩壊剤、結合剤、賦形剤、滑沢剤なども必要に応じて添加される。
【0013】
【実施例】
以下に本発明の実施例及び比較例を示すが、本発明はこれら実施例の内容のみに限定されるものではない。
実施例1
木材パルプを40重量%水酸化ナトリウム水溶液に浸漬後、圧搾してアルカリセルロースを得た。このアルカリセルロース800gを反応機へ仕込み、窒素置換を行った。置換後、酸化プロピレンを反応機へ仕込み攪拌しながら40℃で1時間および70℃で1時間反応して生成物を得た。
5リットル双腕ニーダーに65℃の熱水2リットルを入れ、生成物を投入して生成物の形状がほぼ完全に消失(約3リットルのスラリー中、5〜10個生成物小塊の残留が認められる程度)まで10分練合した後、酢酸で中和し晶出させた。
晶出物を90℃の熱水で洗浄後、圧搾して脱水して乾燥した後に、ナイフミルで粉砕して、体積平均粒子径が80ミクロン、ゆるめ嵩密度が0.52g/ml、かため嵩密度が0.70g/mlのL−HPCを得た。
さらに、これをジェットミルで微粉砕して、体積平均粒子径が23ミクロン、ゆるめ嵩密度が0.39g/ml、かため嵩密度が0.69g/mlのL−HPCを得た。L−HPCのヒドロキシプロポキシル基含量は日本薬局方により、体積平均粒子径はSympatec社のHELOSにより、その他はホソカワミクロン社のパウダーテスターにより測定した。
【0014】
実施例2〜3
酸化プロピレンの添加量を適宜調節した以外は、実施例1と同様な方法によりL−HPCを得た。ヒドロキシプロポキシル含量はそれぞれ9%(実施例2)、10.8%(実施例3)であった。結果を表1に示す。
【0015】
比較例1〜2
比較例1は、信越化学工業社製L−HPC(LH−21)を用いた。比較例2は同社製L−HPC(LH−31)を用いた。LH−31は、比較例1で用いたLH−21をさらにジェットミルで微粉砕したものである。
【0016】
流動層造粒と打錠による試験
アセトアミノフェン40重量部、乳糖14重量部、コーンスターチ6重量部、L−HPC40重量部を混合し、流動層造粒装置(フロイント社フローコーターFLO−1型)に投入した。これにヒドロキシプロピルセルロース(日本曹達社製HPC−L)の5重量%水溶液を結合剤として、以下に示す造粒条件により造粒を行った。
<流動層造粒条件>
仕込み量 1kg
吸気温度 60℃
排気温度 30〜 35℃
流動空気量 1.6 m3/h
スプレー速度 50kg/min
スプレー圧 3kg/cm2
後乾燥 吸気70℃で 30分
流動層造粒の途中で内容物を観察し、問題なく流動が続いたものを「良」、途中で流動がストップしたか、或いは流動が低下して風量を上げるなどの操作の必要性があったものを「不良」とした。得られた造粒物の嵩密度をパウダーテスターにより測定した。
また、圧縮度は、ゆるみ嵩密度と固め嵩密度から以下の式に基づき計算した。
圧縮度(%)={(固め嵩密度−ゆるめ嵩密度)/固め嵩密度}×100
【0017】
造粒物に0.5重量%の割合でステアリン酸マグネシウムを混合し、以下に示す条件で打錠した。
<打錠条件>
装置 菊水製作所 VERGO
予圧 0.3 t
本圧 1 t
錠剤サイズ 直径8mm、曲率半径 7.5m
錠剤重量 約170mg
打錠速度 40rpm (480錠/分)
錠剤50錠の重量を精密にはかり、重量偏差(CV%)を計算した。
【0018】
直接打錠試験
直打用乳糖70重量部、L−HPC30重量部、ステアリン酸マグネシウム 0.5重量%を混合して打錠末を調製した。これを上記打錠条件と同様に打錠して実験1と同様に重量偏差を測定した。
【0019】
舌触り試験
実験2で調製した錠剤を舌の上にのせ、その触感を官能的に評価した。ざらつきが感じられたものを「不良」、それほど感じられなかったものを「良」とした。
【0020】
以上の結果を表1に示す。実施例1〜3は、比較例1〜2のものに比べて、流動層造粒において流動停止などの問題が見られず、得られた造粒物が重質で流動性が高く、打錠においても重量偏差のより少ないものであった。また、舌触りのざらつき感も少なく、良好であった。
【0021】
【発明の効果】
本発明によれば従来のL−HPCを使用する場合と比較して、顆粒が重質なものとなって流動性に富み、ハードカプセルに充填する場合に用量を高くでき、高速打錠時に重量偏差が少なくなる一方、 得られた製剤の舌触りが改善される。また、流動層造粒を行う場合に流動停止などの問題が減少し、 直接打錠の場合はL−HPCの含有量を高めても重量偏差の問題が少なくなる。
【0022】
【表1】

Figure 0004070402
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-substituted hydroxypropyl cellulose used as an additive for pharmaceuticals, agricultural chemicals, and foods, a solid preparation containing the same, and a method for producing them.
[0002]
[Prior art]
Solid preparations such as tablets and granules are used for pharmaceuticals, agricultural chemicals, foods, and other industrial purposes. These are generally prepared by mixing the active ingredient with additives such as excipients, disintegrants, and binders. Or tableting, adding water or a binder to the mixture and stirring or kneading, followed by granulation to form a granule or fine granule.
In these solid preparations, low-substituted hydroxypropylcellulose (hereinafter also referred to as “L-HPC”) listed in the Japanese Pharmacopoeia as a disintegrant and binder is used (Japanese Patent Publication No. 48-38858). Gazette, Japanese Patent Publication No. 51-19017, Japanese Patent Publication No. 57-53100, Japanese Patent Laid-Open No. 7-324101).
[0003]
L-HPC is a kind of cellulose ether and is similar to hydroxypropyl cellulose (hereinafter also referred to as “HPC”), which is widely used as a binder, but has different properties. That is, the essential difference between HPC and L-HPC lies in the hydroxypropoxyl group content of L-HPC, which is 53.4-77.5% for HPC, while 5 for L-HPC. ~ 16%. This value is measured by the method listed in the Japanese Pharmacopoeia, and the range is clearly defined in the monograph of the Japanese Pharmacopoeia “low-substituted hydroxypropylcellulose”.
[0004]
However, the conventional L-HPC commercially available has the following problems because the loose bulk density is about 0.3 g / ml and the flowability of the powder is poor. First, when a granule is prepared by fluidized bed granulation, the bulk density of the granule is lower and the fluidity is lower than the powder characteristics of L-HPC. And when this granule is filled in a hard capsule to make a capsule, it becomes impossible to fill a desired dose. Further, in the process of producing tablets by tableting the granules, tableting at a high speed increases the tablet weight deviation due to its bulkiness and poor fluidity.
Furthermore, when the amount of L-HPC added is particularly large as a fundamental problem, fluidized bed granulation itself becomes difficult. This is because the powder being granulated absorbs water and swells to increase the bulk, and the flow stops or becomes defective and the particle size distribution becomes considerably non-uniform.
And the formulation which added L-HPC also had the problem that a touch was bad when it was included in the mouth.
[0005]
[Problems to be solved by the invention]
The present invention makes the granule heavy and rich in fluidity, can be increased in dosage when filled into a hard capsule, reduces the weight deviation during high-speed tableting, improves the feel of the resulting formulation, An object of the present invention is to provide a low-substituted hydroxypropylcellulose that reduces problems such as flow stoppage when performing layer granulation, a solid preparation containing the same, and a method for producing the same.
[0006]
[Means for Solving the Problems]
As a result of intensive studies for solving the above problems, the present inventors have found that the loose bulk density after the first pulverization step is 0.40 g / ml or more and the hardened bulk density is 0.60 g / ml or more. By using low-substituted hydroxypropylcellulose obtained by further pulverizing low-substituted hydroxypropylcellulose, fluidity and texture are improved, weight deviation is reduced during high-speed tableting, and fluidity when fluidized bed granulation is performed. The present inventors have found that the problem of weight deviation can be reduced even if the content of L-HPC is increased in the case of direct tableting, by reducing problems such as stopping, and the present invention has been made.
That is, a step of preparing alkali cellulose by immersing the pulp in an alkaline solution, a step of reacting the alkali cellulose with a hydroxypropylating agent such as propylene oxide to make the product completely dissolved, and neutralizing with acid Crystallization step, washing step, drying step, volume average particle size measured by dry laser diffraction method is less than 25 microns, loose bulk density is 0.29 g / ml or more and less than 0.40 g / ml. And a method for producing low-substituted hydroxypropylcellulose, and a low-substituted hydroxypropylcellulose, comprising a pulverization step performed in two steps to obtain a pulverized product having a hardened bulk density of 0.55 g / ml or more . Moreover, the solid formulation containing a low substituted hydroxypropyl cellulose is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The “relaxed bulk density” in the present invention means a bulk density in a loosely packed state, and a sample is placed in a cylindrical container having a diameter of 5.03 cm and a height of 5.03 cm (volume: 100 ml) of JIS 22 mesh (710 μm). It is measured by feeding uniformly from above 23 cm of the container through a sieve, grinding the upper surface and weighing.
On the other hand, the “hardened bulk density” is a bulk density when tapping is added to form a close packing. Tapping is an operation in which a sample-filled container is repeatedly dropped from a certain height so that a light impact is applied to the bottom portion to close-pack the sample. Actually, when measuring the loose bulk density, weigh the upper surface and weigh it, then put a cap, which is a Hosokawa Micron powder tester, on top of this container, add the powder to the upper edge and add the tap height. A 1.8 cm tapping is performed 180 times. After completion, the cap is removed, the powder is ground on the upper surface of the container and weighed, and the bulk density in this state is set as the bulk density. These operations can be measured by using a powder tester (PT-D) manufactured by Hosokawa Micron.
[0008]
The L-HPC of the present invention can be produced by the following method.
First, pulp is immersed in an alkali solution to obtain alkali cellulose, which is reacted with a hydroxypropylating agent such as propylene oxide. Up to this stage, it is the same as the conventional L-HPC production method, but in the subsequent process, the product is poured into water or water adjusted to alkaline to dissolve it, and after making it into an almost uniform opaque slurry, hydrochloric acid After recovering the L-HPC that has been neutralized and precipitated by washing with water, it is washed with water, dried and pulverized.
In the conventional method, partial neutralization is performed to make the dissolution incomplete, and a semi-dissolved state is obtained. By controlling this state, the fiber density is changed and the bulk density is adjusted. The target L-HPC is obtained by making it into a dissolved state.
The completely dissolved state here means a state in which the product loses its shape almost completely. That is, not only it becomes completely transparent, but also includes an opaque slurry state and a level where 5 to 10 residual product souls are observed in a 3 liter slurry. The state after dissolution is a highly viscous slurry, and a kneader with strong stirring power such as a kneader is required. Thereafter, L-HPC is precipitated by neutralization with an acid such as hydrochloric acid as in the conventional method, and this product is recovered, washed, dried and pulverized to obtain a product.
In addition, in order to completely dissolve the product, it was found that the preparation conditions of the alkali cellulose are affected, and particularly when the alkaline solution for dipping is sodium hydroxide having a concentration of 45% by weight or less, it is likely to be in a completely dissolved state. Conventionally, it was carried out using a 49% by weight sodium hydroxide solution, but it is thought that by reducing the concentration, the uniformity of the reaction increased and the solubility improved.
[0009]
The pulverization process is performed in two stages, and the intermediate obtained by the first pulverization is L-HPC having a loose bulk density of 0.40 g / ml or more and a solid bulk density of 0.60 g / ml or more. preferable. When such re-grinding, the use of L-HPC in particular bulk density, finally obtained granule of L-HPC is a thing heavy rich in flowability and filled into hard capsules In some cases, the dosage can be increased, and the weight deviation is reduced during high-speed tableting, while the touch of the resulting preparation is improved.
Further, problems such as flow stoppage are reduced when fluidized bed granulation is performed, and in the case of direct tableting, the problem of weight deviation is reduced even if the content of L-HPC is increased.
The volume average particle diameter of the intermediate obtained by the first pulverization is not particularly limited, but for reasons such as pulverization ability, the volume average particle diameter by dry laser diffraction is preferably 30 microns or more.
The first pulverization step can be performed using a pulverizer such as a ball mill, a hammer mill, or a knife mill, and the second pulverization step can be performed using a fine pulverizer such as a jet mill.
[0010]
L-HPC obtained by such a method becomes heavier than the conventional one, and in particular, the volume average particle diameter by dry laser diffraction method is less than 25 microns, and the loose bulk density is 0.29 g / ml or more and 0.2. When it is less than 40 g / ml and the hardened bulk density is 0.55 g / ml or more, the granulated product by fluidized bed granulation is of good quality, which is preferable.
Incidentally, the dry laser diffraction method referred to in the present invention is, for example, a method in which a powder sample is ejected with compressed air, such as a method using a HELOS apparatus of Sympatec, Germany, and the diffraction intensity is applied. A method for measuring the volume average diameter. The volume average particle diameter can be determined by the formula {Σ (Summary), as described in, for example, “Revised Supplementary Powder Physical Properties”, Powder Engineering Society / Japan Powder Industrial Technology Association, Nikkei Technical Book, 1985, p. 88. nD 3 ) / Σn} 1/3 . In the formula, D is the diameter of the particle, n is the number of particles of that diameter, and Σn is the total number of particles.
The present invention is not limited to the preferred embodiment comprising the above two-stage pulverization process as long as the final low-substituted hydroxypropylcellulose can be obtained. It may be a grinding process or a one-stage grinding process. However, when pulverizing in two stages, since the quality of the pulverized product in the first stage can be controlled, there is an advantage that the quality of the final product is stable and the burden on the pulverizer is difficult.
[0011]
The solid preparation in the present invention refers to tablets, granules, fine granules, capsules and the like. Any method such as direct tableting, wet tableting, dry granulation, and fluidized bed granulation can be applied to the method for producing these solid preparations.
In direct tableting, the active ingredient and additives are mixed and compressed as it is, and in wet tableting, the mixture of active ingredient and additive is kneaded with an appropriate solvent such as a binder solution or water and granulated. The tablet is dried and then tableted. The latter is performed for the purpose of enhancing the fluidity of the powder of the main agent or additive when the fluidity is poor.
In dry granulation, when the active ingredient is unstable in the presence of water, the active ingredient and additives are mixed, compressed with a roll mixer, etc., and then pulverized and sized. Granules and fine granules can be either wet or dry granulated as they are, or a mixture of the active ingredient and additive is kneaded with water or a binder solution and then extruded and then pulverized and sized. And make it. Capsules are produced by filling granules and fine granules into hard capsules made of gelatin or cellulose derivatives.
The main granulation processes in the wet granulation method of tablets or granules and fine granules include stirring granulation using a high-speed stirrer and fluidized bed granulation using a fluidized bed.
Here, fluidized bed granulation is preferred in recent years because the particle size distribution of the granulated product is narrower than that of stirring granulation and it is easy to perform process control. When L-HPC is used, it becomes a very bulky granulated product, and it is inferior in fluidity so that it cannot be tableted without flowing out of the hopper of the tableting machine, or the weight deviation of the tablet is remarkable. It gets bigger. However, the L-HPC of the present invention is characterized by being able to cope with fluidized bed granulation.
[0012]
The amount of L-HPC contained in these solid preparations is appropriately determined depending on the addition amount and properties of the main component.
In addition, the main component added to the solid preparation is not particularly limited, such as antipyretic analgesics, antibiotics and anti-inflammatory agents for pharmaceuticals, vitamins and nutrients for foods, other agricultural chemicals and detergents, and other additives. Disintegrants, binders, excipients, lubricants, and the like are also added as necessary.
[0013]
【Example】
Examples and Comparative Examples of the present invention are shown below, but the present invention is not limited to the contents of these Examples.
Example 1
Wood pulp was immersed in a 40 wt% aqueous sodium hydroxide solution and then pressed to obtain alkali cellulose. 800 g of this alkali cellulose was charged into a reactor, and nitrogen substitution was performed. After substitution, propylene oxide was charged into the reactor and reacted with stirring at 40 ° C. for 1 hour and at 70 ° C. for 1 hour to obtain a product.
Put 2 liters of hot water at 65 ° C. into a 5 liter double arm kneader and throw the product into it, and the shape of the product disappeared almost completely (about 5 to 10 product lumps remained in about 3 liters of slurry). The mixture was kneaded for 10 minutes until it was recognized, and then neutralized with acetic acid to cause crystallization.
The crystallized product was washed with hot water at 90 ° C., pressed, dehydrated and dried, and then pulverized with a knife mill. The volume average particle size was 80 microns, the loose bulk density was 0.52 g / ml, and the bulk was increased. L-HPC having a density of 0.70 g / ml was obtained.
Further, this was finely pulverized with a jet mill to obtain L-HPC having a volume average particle diameter of 23 microns, a loose bulk density of 0.39 g / ml, and a bulk density of 0.69 g / ml. The hydroxypropoxyl group content of L-HPC was measured by the Japanese Pharmacopoeia, the volume average particle size was measured by Sympatec's HELOS, and the others were measured by Hosokawa Micron's powder tester.
[0014]
Examples 2-3
L-HPC was obtained by the same method as in Example 1 except that the amount of propylene oxide added was adjusted appropriately. The hydroxypropoxyl content was 9% (Example 2) and 10.8% (Example 3), respectively. The results are shown in Table 1.
[0015]
Comparative Examples 1-2
In Comparative Example 1, L-HPC (LH-21) manufactured by Shin-Etsu Chemical Co., Ltd. was used. In Comparative Example 2, L-HPC (LH-31) manufactured by the same company was used. LH-31 is obtained by further pulverizing LH-21 used in Comparative Example 1 with a jet mill.
[0016]
Fluidized bed granulation and tableting test 40 parts by weight of acetaminophen, 14 parts by weight of lactose, 6 parts by weight of corn starch and 40 parts by weight of L-HPC were mixed to prepare a fluidized bed granulator (Freund Corporation Flow Coater FLO-1 type). It was thrown into. This was granulated under the following granulation conditions using a 5% by weight aqueous solution of hydroxypropylcellulose (HPC-L manufactured by Nippon Soda Co., Ltd.) as a binder.
<Fluidized bed granulation conditions>
Charge amount 1kg
Intake air temperature 60 ℃
Exhaust temperature 30 ~ 35 ℃
Flowing air volume 1.6 m 3 / h
Spray speed 50kg / min
Spray pressure 3kg / cm 2
Post-drying At 70 ° C for 30 minutes, observe the contents in the middle of fluidized bed granulation, "good" if the flow continued without any problems, or the flow stopped halfway or the flow decreased and the air volume increased Those that needed to be manipulated were defined as “bad”. The bulk density of the obtained granulated material was measured with a powder tester.
The degree of compression was calculated based on the following formula from the loose bulk density and the hard bulk density.
Compressibility (%) = {(solid bulk density−loose bulk density) / solid bulk density} × 100
[0017]
The granulated product was mixed with magnesium stearate at a ratio of 0.5% by weight, and tableted under the following conditions.
<Tabletting conditions>
Equipment Kikusui Seisakusho VERGO
Preload 0.3 t
Main pressure 1 t
Tablet size Diameter 8mm, radius of curvature 7.5m
Tablet weight about 170mg
Tableting speed 40rpm (480 tablets / min)
The weight of 50 tablets was precisely weighed and the weight deviation (CV%) was calculated.
[0018]
Direct tableting test A tableting powder was prepared by mixing 70 parts by weight of lactose for direct compression, 30 parts by weight of L-HPC, and 0.5% by weight of magnesium stearate. This was tableted in the same manner as the above tableting conditions, and the weight deviation was measured in the same manner as in Experiment 1.
[0019]
Tongue touch test The tablet prepared in Experiment 2 was placed on the tongue, and its tactile sensation was sensoryly evaluated. Those that felt rough were rated "bad", and those that did not feel so much were rated "good".
[0020]
The results are shown in Table 1. In Examples 1 to 3, compared with those of Comparative Examples 1 and 2, problems such as flow stoppage were not observed in fluidized bed granulation, and the obtained granulated material was heavy and high in fluidity. Also, the weight deviation was smaller. Moreover, there was little rough feeling of a tongue touch and it was favorable.
[0021]
【The invention's effect】
According to the present invention, compared to the case of using conventional L-HPC, the granules are heavier and rich in fluidity. When filled into hard capsules, the dosage can be increased, and the weight deviation during high-speed tableting. While the touch of the resulting formulation is improved. Moreover, problems such as flow stoppage are reduced when fluidized bed granulation is performed, and in the case of direct tableting, the problem of weight deviation is reduced even if the content of L-HPC is increased.
[0022]
[Table 1]
Figure 0004070402

Claims (6)

パルプをアルカリ溶液に浸漬してアルカリセルロースを調製する工程と、該アルカリセルロースをヒドロキシプロピル化剤と反応させ、その生成物を完全溶解状態とする工程と、酸で中和して晶出させる工程と、洗浄工程と、乾燥工程と、乾式レーザー回折法により測定される体積平均粒子径が25ミクロン未満、ゆるめ嵩密度が0.29g/ml以上0.40g/ml未満であり、かつ固め嵩密度が0.55g/ml以上である粉砕物を得るための二段階で行われる粉砕工程とを含む低置換度ヒドロキシプロピルセルロースの製造方法。A step of preparing alkali cellulose by immersing pulp in an alkali solution, a step of reacting the alkali cellulose with a hydroxypropylating agent to completely dissolve the product, and a step of crystallization by neutralizing with an acid And a volume average particle size measured by a dry laser diffraction method of less than 25 microns, a loose bulk density of 0.29 g / ml or more and less than 0.40 g / ml, and a hardened bulk density. And a pulverization step performed in two stages to obtain a pulverized product having a slag of 0.55 g / ml or more. 上記粉砕工程が、乾式レーザー回折法により測定される体積平均粒子径が30ミクロン以上、ゆるめ嵩密度が0.40g/ml以上であり、かつ固め嵩密度が0.60g/ml以上である第1粉砕段階後の低置換度ヒドロキシプロピルセルロースを、第2粉砕段階でさらに粉砕することを特徴とする請求項1に記載の低置換度ヒドロキシプロピルセルロースの製造方法。The grinding process is a volume average particle diameter measured by a dry type laser diffraction method 30 microns or more, loose bulk density of 0.40 g / ml or more, and is compacted bulk density of 0.60 g / ml or more first The method for producing low-substituted hydroxypropyl cellulose according to claim 1, wherein the low-substituted hydroxypropylcellulose after the first pulverization step is further pulverized in the second pulverization step. 請求項1又は請求項2に記載の方法により製造された低置換度ヒドロキシプロピルセルロース。  A low-substituted hydroxypropyl cellulose produced by the method according to claim 1 or 2. 乾式レーザー回折法により測定される体積平均粒子径が25ミクロン未満、ゆるめ嵩密度が0.29g/ml以上0.40g/ml未満であり、かつ固め嵩密度が0.55g/ml以上である低置換度ヒドロキシプロピルセルロース。  Low volume average particle size measured by dry laser diffraction method is less than 25 microns, loose bulk density is not less than 0.29 g / ml and less than 0.40 g / ml, and compact bulk density is not less than 0.55 g / ml Degree of substitution hydroxypropylcellulose. 請求項3又は請求項4に記載の低置換度ヒドロキシプロピルセルロースを含有することを特徴とする固形製剤。  A solid preparation comprising the low-substituted hydroxypropyl cellulose according to claim 3 or 4. 錠剤、顆粒剤、細粒剤、カプセル剤から選ばれる剤形を有する請求項5に記載の固形製剤。  The solid preparation according to claim 5, which has a dosage form selected from tablets, granules, fine granules and capsules.
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