JP7358406B2 - Rdaが低減された第一スズ適合性の球状シリカ粒子 - Google Patents
Rdaが低減された第一スズ適合性の球状シリカ粒子 Download PDFInfo
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- JP7358406B2 JP7358406B2 JP2020569071A JP2020569071A JP7358406B2 JP 7358406 B2 JP7358406 B2 JP 7358406B2 JP 2020569071 A JP2020569071 A JP 2020569071A JP 2020569071 A JP2020569071 A JP 2020569071A JP 7358406 B2 JP7358406 B2 JP 7358406B2
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- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 1
- MLIKYFGFHUYZAL-UHFFFAOYSA-K trisodium;hydron;phosphonato phosphate Chemical compound [Na+].[Na+].[Na+].OP([O-])(=O)OP([O-])([O-])=O MLIKYFGFHUYZAL-UHFFFAOYSA-K 0.000 description 1
- WGIWBXUNRXCYRA-UHFFFAOYSA-H trizinc;2-hydroxypropane-1,2,3-tricarboxylate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O WGIWBXUNRXCYRA-UHFFFAOYSA-H 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 239000009637 wintergreen oil Substances 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 239000000811 xylitol Substances 0.000 description 1
- 235000010447 xylitol Nutrition 0.000 description 1
- 229960002675 xylitol Drugs 0.000 description 1
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 229960001939 zinc chloride Drugs 0.000 description 1
- 239000011746 zinc citrate Substances 0.000 description 1
- 235000006076 zinc citrate Nutrition 0.000 description 1
- 229940068475 zinc citrate Drugs 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical class [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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Description
フッ化第一スズを含む第一スズ含有組成物は、練歯磨剤および他の歯磨剤用途に使用され、虫歯防止の改善と、歯垢、歯肉炎および歯の過敏症の低減とをもたらす。しかしながら、歯磨剤組成物中の第一スズの有効性は、シリカ材料などの配合物の他の成分との相互作用を理由に低下することがある。したがって、歯磨剤組成物中の第一スズの全体的な有効性を改善するためには、改善された第一スズ適合性を有するシリカ材料を提供することが有益であろう。
この概要は、詳細な説明において以下でさらに説明される概念を簡略化された形式で紹介すべく設けられる。この概要は、特許請求される主題の必要なまたは必須の特徴を特定することを意図していない。この概要はまた、特許請求される主題の範囲を限定するために使用されることも意図していない。
本明細書に使用される用語をより明確に定義するために、以下の定義が設けられる。別段の指示がない限り、以下の定義が本開示に適用される。本開示で用語が使用されるが本明細書で具体的に定義されていない場合、この定義が、本明細書で適用される他の開示もしくは定義のいずれかに矛盾しない限り、または定義が適用されるいずれの請求項も不明瞭もしくは非許容にしない限り、IUPAC Compendium of Chemical Terminology, 2nd Ed (1997)からの定義が適用され得る。参照により本明細書に組み込まれる任意の文献に記載の任意の定義または使用が、本明細書に設けられる定義または使用と矛盾する限りにおいて、本明細書に設けられる定義または使用が優先される。
本明細書に開示されるのは、概して、(i)約8~約20μm、具体的な態様では約8~約18μm、より具体的な態様では約9μm~約16μmの範囲のd50中央粒径、(ii)約0.9以上、具体的な態様では約0.92以上、より具体的な態様では約0.94以上の球形度係数(S80)、(iii)約0.1~約8m2/g、具体的な態様では約0.1~約6m2/g、より具体的な態様では約0.5~約5m2/gの範囲のBET表面積、(iv)約0.35~約0.8cc/g、具体的な態様では約0.35~約0.7cc/g、より具体的な態様では約0.4~約0.65cc/gの範囲の総水銀侵入細孔容積、および(v)約3~約7重量%、具体的な態様では約3~約6重量%、より具体的な態様では約3.2~約5.5重量%の範囲の強熱減量(LOI)を特徴とし得る球状シリカ粒子である。これらの球状シリカ粒子を製造する方法および球状粒子を含有する歯磨剤組成物もまた、本明細書に開示および説明されている。
本発明に合致するシリカ粒子の例示的かつ非限定的な例は、以下の特性を有し得る:(i)約8~約20μmの範囲のd50中央粒径、(ii)約0.9以上の球形度係数(S80)、(iii)約0.1~約8m2/gの範囲のBET表面積、(iv)約0.35~約0.8cc/gの範囲の総水銀侵入細孔容積、および(v)約3~約7重量%の範囲の強熱減量(LOI)。本発明に合致するシリカ粒子の例示的かつ非限定的な別の例は、以下の特性を有し得る:(i)約8~約18μmの範囲のd50中央粒径、(ii)約0.92以上の球形度係数(S80)、(iii)約0.1~約6m2/gの範囲のBET表面積、(iv)約0.35~約0.7cc/gの範囲の総水銀侵入細孔容積、および(v)約3~約6重量%の範囲の強熱減量(LOI)。本発明に合致するシリカ粒子の例示的かつ非限定的なさらなる別の例は、以下の特性を有し得る:(i)約9~約16μmの範囲のd50中央粒径、(ii)約0.94以上の球形度係数(S80)、(iii)約0.5~約5m2/gの範囲のBET表面積、(iv)約0.4~約0.65cc/gの範囲の総水銀侵入細孔容積、および(v)約3.2~約5.5重量%の範囲の強熱減量(LOI)。さらなる態様では、本発明に合致するそのようなシリカ粒子はまた、以下に記載のおよび任意の組み合わせの特徴または特性のうちのいずれかを有し得る。
本明細書に開示される球状シリカ粒子は、特定の合成手順に限定されることはない。しかしながら、所望の球形度を達成するために、連続ループ反応器法を利用して、球状の沈降シリカ粒子が形成され得る。一般的な方法および関連する反応器系(1つ以上のループ反応器管の連続ループを含み得る)は、その全体が参照により本明細書に組み込まれる米国特許第8,945,517号明細書および同第8,609,068号明細書に記載されている。本明細書に記載されているように、粒子の球形度を改善するために、一般的な方法および反応器系に適切な修正が加えられる。
球状シリカ粒子は、任意の適切な組成物中で、任意の適切な最終用途のために使用され得る。多くの場合、シリカ粒子は、歯磨剤組成物などの口腔ケア用途で使用され得る。歯磨剤組成物は、任意の適切な量のシリカ粒子、例えば、約0.5~約50重量%、具体的な態様では約1~約50重量%、具体的な態様では約5~約35重量%、具体的な態様では約10~約40重量%、より具体的な態様では約10~約30重量%の球状シリカ粒子を含有し得る。これらの重量パーセントは、歯磨剤組成物の総重量を基準とする。
本発明を以下の実施例によりさらに説明するが、これらは、決して本発明の範囲を限定するものと解釈されるべきではない。本明細書の説明の読後に、さまざまな他の態様、変形形態、およびそれらの等価物が、本発明の趣旨または添付の特許請求の範囲から逸脱することなく、当業者に自明であろう。
比較用シリカ粒子および球状シリカ粒子
例1Aは、不規則な非球状の粒子形態を有する、Evonik Corporationから市販されている従来のシリカ材料であった。
例5C
練歯磨剤配合物、ならびにPCRおよびRDA試験
シリカ試料1A~5Aを、練歯磨剤配合物1B~5B中にて各シリカの添加量20重量%で、練歯磨剤配合物5C中にて各シリカの添加量10重量%で使用した。
不規則なシリカ粒子
表IVには、不規則な非球状の粒子形態を有する比較用シリカ材料7A~11Aの特定の特性が要約されている。例7Aは、Evonik Corporationから市販されている従来のシリカ材料であり、例8A~11Aは、例7Aの未粉砕の試料を、3.5μm(例8A)、6.2μm(例9A)、9.4μm(例10A、広い粒径分布)、および9.3μm(例11A、狭い粒径分布)のd50粒径まで空気粉砕することにより製造した。
練歯磨剤配合物、ならびにPCRおよびRDA試験
例1B~5Bについて表IIに示されているのと同じ配合物を使用して、シリカ7A~11Aの試料を、練歯磨剤配合物7B~11B中にて各シリカの添加量20重量%で使用した。
表IIIのデータと表Vのデータとを比較すると、球状シリカ材料の挙動は、基本的に(かつ驚くべきことに)、非球状の不規則な形状の従来の歯科用シリカの挙動とは異なる。高度に球状の材料では、RDAおよびPCRを制御するために粒径および粒径分布が使用され得るが、従来の不規則な形状のシリカの場合、粒径および粒径分布は著しい影響を与えない。
練歯磨剤配合物、ならびにPCRおよびRDA試験
シリカ3A~6Aおよび12A~13Aの試料を、表VIに要約されているように、歯石予防練歯磨剤配合物3D~6Dおよび12D~13D中にて各シリカの添加量22重量%で使用した。シリカ12A~13Aは、Evonik Corporationから入手可能な従来の(不規則な形状の)シリカであり、公称d50粒径は8~10μmの範囲にあり、BET表面積は20m2超/gであり、第一スズ適合性は一般的な低さであった(50%未満)。
態様1.
(i) 約8~約20μmの範囲のd50中央粒径、
(ii) 約0.9以上の球形度係数(S80)、
(iii) 約0.1~約8m2/gの範囲のBET表面積、
(iv) 約0.35~約0.8cc/gの範囲の総水銀侵入細孔容積、および
(v) 約3~約7重量%の範囲の強熱減量(LOI)
を特徴とする、シリカ粒子。
(a) 第1の鉱酸および第1のアルカリ金属ケイ酸塩を、液体媒体流を含むループ反応域に連続的に供給し、そこで第1の鉱酸および第1のアルカリ金属ケイ酸塩の少なくとも一部を反応させ、ループ反応域の液体媒体中でベースシリカ生成物を形成するステップと、
(b) ループ反応域を通じて液体媒体を連続的に再循環させるステップと、
(c) ベースシリカ生成物を含む液体媒体の一部をループ反応域から連続的に排出するステップと、
(d) 第2の鉱酸および第2のアルカリ金属ケイ酸塩を、表面積減少条件下で水とベースシリカ生成物との混合物に添加するステップと、
(e) 第2のアルカリ金属ケイ酸塩の添加を停止し、かつ混合物への第2の鉱酸の添加を継続し、混合物のpHを約5~約8.5の範囲内に調整し、シリカ粒子を生成するステップと
を含む、シリカ粒子を製造する方法。
Claims (18)
- (i) 8~20μmの範囲のd50中央粒径、
(ii) 0.9以上の球形度係数(S80)、
(iii) 0.1~6m2/gの範囲のBET表面積、
(iv) 0.35~0.7cc/gの範囲の総水銀侵入細孔容積、および
(v) 3~7重量%の範囲の強熱減量(LOI)
を特徴とする、シリカ粒子。 - 前記d50中央粒径が、8~18μmの範囲にある、請求項1記載のシリカ粒子。
- 前記球形度係数(S80)が、0.92以上である、請求項1または2記載のシリカ粒子。
- 前記BET表面積が、0.5~5m2/gの範囲にある、請求項1から3までのいずれか1項記載のシリカ粒子。
- 前記総水銀侵入細孔容積が、0.4~0.65cc/gの範囲にある、請求項1から4までのいずれか1項記載のシリカ粒子。
- 前記強熱減量(LOI)が、3~6重量%の範囲にある、請求項1から5までのいずれか1項記載のシリカ粒子。
- 前記シリカ粒子が、
53~75lb/ft3の範囲の充填密度、
40~65lb/ft3の範囲のかさ密度、
7~25mg損失/100,000回転の範囲のアインレーナー摩耗値、または
それらの組み合わせ
をさらに特徴とする、請求項1から6までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が、
61~72lb/ft3の範囲の充填密度、
42~60lb/ft3の範囲のかさ密度、
10~22mg損失/100,000回転の範囲のアインレーナー摩耗値、または
それらの組み合わせ
をさらに特徴とする、請求項1から7までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が、
70~99%の範囲の第一スズ適合性、
70~99%の範囲のCPC適合性、
1.1~2.2の範囲の(d90-d10)/d50比、
1.2重量%以下の325メッシュ残留物、または
それらの組み合わせ
をさらに特徴とする、請求項1から8までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が、
80~95%の範囲の第一スズ適合性、
78~95%の範囲のCPC適合性、
1.2~2の範囲の(d90-d10)/d50比、
0.6重量%以下の325メッシュ残留物、または
それらの組み合わせ
をさらに特徴とする、請求項1から9までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が、
40~75cc/100gの範囲の吸水量、
20~75cc/100gの範囲の油吸収量、
0~10m2/gの範囲のCTAB表面積、
1~15重量%の範囲の乾燥減量(LOD)、または
それらの組み合わせ
をさらに特徴とする、請求項1から10までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が、
42~75cc/100gの範囲の吸水量、
25~55cc/100gの範囲の油吸収量、
0~4m2/gの範囲のCTAB表面積、
3~12重量%の範囲の乾燥減量(LOD)、または
それらの組み合わせ
をさらに特徴とする、請求項1から11までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が、
120~200の範囲の添加量20重量%でのRDA、および/または
0.4:1~0.8:1の範囲の添加量20重量%でのPCR/RDA比
をさらに特徴とする、請求項1から12までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が、
130~180の範囲の添加量20重量%でのRDA、および/または
0.5:1~0.7:1の範囲の添加量20重量%でのPCR/RDA比
をさらに特徴とする、請求項1から13までのいずれか1項記載のシリカ粒子。 - 前記シリカ粒子が沈降シリカ粒子である、請求項1から14までのいずれか1項記載のシリカ粒子。
- 前記シリカ粒子がアモルファスである、請求項1から15までのいずれか1項記載のシリカ粒子。
- (a) 第1の鉱酸および第1のアルカリ金属ケイ酸塩を、液体媒体流を含むループ反応域に連続的に供給し、そこで前記第1の鉱酸および前記第1のアルカリ金属ケイ酸塩の少なくとも一部を反応させ、前記ループ反応域の前記液体媒体中でベースシリカ生成物を形成するステップと、
(b) 前記ループ反応域を通じて前記液体媒体を連続的に再循環させるステップと、
(c) 前記ベースシリカ生成物を含む前記液体媒体の一部を前記ループ反応域から連続的に排出するステップと、
(d) 第2の鉱酸および第2のアルカリ金属ケイ酸塩を、表面積減少条件下で水とベースシリカ生成物との混合物に添加するステップと、
(e) 前記第2のアルカリ金属ケイ酸塩の添加を停止し、かつ前記混合物への前記第2の鉱酸の添加を継続し、前記混合物のpHを5~8.5の範囲内に調整し、シリカ粒子を生成するステップと
を含む、シリカ粒子を製造する方法。 - ステップ(b)で、
前記ループ反応域が、ステータスクリーンを含まないか、もしくは前記ループ反応域が、断面積3mm2超の開口部を有するステータスクリーンを含むか、または
前記ループ反応域における剪断頻度が、1,000,000未満の相互作用数/分であるか、または
その双方である、
請求項17記載の方法。
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PCT/EP2019/065389 WO2019238777A1 (en) | 2018-06-12 | 2019-06-12 | Spherical stannous compatible silica particles for reduced rda |
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WO2023117446A1 (en) | 2021-12-20 | 2023-06-29 | Evonik Operations Gmbh | Precipitated silica and methods thereof |
WO2024009168A1 (en) * | 2022-07-02 | 2024-01-11 | Madhu Silica Pvt. Ltd. | Preparation of silica particles exhibiting globulous morphology |
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