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公开(公告)号:ZA9811286B
公开(公告)日:1999-06-09
申请号:ZA9811286
申请日:1998-12-09
Applicant: DEGUSSA
Inventor: ESCH HEINZ , KUHLMANN ROBERT , NEUMUELLER MATTHIAS , OTTO KARIN , RAUSCH RALF , THOMAS KLAUS-PETER
Abstract: Precipitated silica that contains an active agent and provides delayed release of the active agent is new. Also claimed is a process for preparing a product as above, in which precipitated silica is produced in known manner and a moderately to sparingly water-soluble active agent is added to the precipitation medium or the precipitate suspension or is dried together with the washed and optionally redispersed silica paste or is ground together with the dried material.
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公开(公告)号:ZA966165B
公开(公告)日:1997-02-10
申请号:ZA966165
申请日:1996-07-19
Applicant: DEGUSSA
Inventor: RAUSCH RALF , KUHLMANN ROBERT , MEIER KARL , ESCH HEINZ , TUERK GUENTER , MEON WALTER
IPC: C01B33/18 , C01B33/193 , C08K3/36 , C08L23/06 , C01B33/143 , H01M2/14 , H01M2/16 , C01B , H01M , C08K , C08L
Abstract: Pptd. silica (I) contg. 4-18 wt.% Na2SO4 is claimed. Also claimed are: (1) prepn. of the silica (I); (II) use of the silica in battery separators; and (III) battery separators per se The battery separator is pref. of polyethylene.
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公开(公告)号:DK0643015T3
公开(公告)日:1996-12-23
申请号:DK94111686
申请日:1994-07-27
Applicant: DEGUSSA
Inventor: ESCH HEINZ , KUHLMANN ROBERT , NEUMUELLER MATTHIAS , OTTO KARIN DR , RAUSCH RALF DR
IPC: A61K8/00 , A61K8/25 , A61Q11/00 , C01B33/193
Abstract: Precipitated silica having a BET surface area of 10-130 m /g, a CTAB surface area of 10-70 m /g, a mean particle diameter of 5-20 mu m, a Cu abrasion in 10% strength glycerol (glycerine) dispersion of 4-50 mg and a thickening behaviour in CMC solution (20% strength dispersion) of 300-3500 mPa.s is prepared by simultaneously adding alkali metal silicate (weight ratio SiO2: alkali metal oxide = 2.5-3.9:1) and a mineral acid to an initial charge of water which has been adjusted to a pH of from 7.0 to 9.9 or from 10.0 to 10.7 by addition of water, keeping the pH constant between 7.0 and 9.9 or 10.0 and 10.7, with the initial precipitation temperature being 50-90 DEG C and a viscosity increase commencing at the latest after 25% of the precipitation time, setting the pH to /= 160 g/l to 240 g/l, separating off the solid by filtration and washing, drying and milling it. The precipitated silica can be used as abrasive and/or thickening component in toothpastes.
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公开(公告)号:TR199600452A2
公开(公告)日:1996-12-21
申请号:TR9600452
申请日:1996-05-31
Applicant: DEGUSSA
Inventor: GORL DR UDO , HUNSCHE ANDREA , KUHLMANN ROBERT , SIRAY MUSTAFA , ESCH HEINZ
IPC: C01B33/193 , C08K3/00 , C08K3/36 , C08K9/00 , C01B33/187 , C08K9/06 , C08L21/00 , C09C1/30
Abstract: - Pptd. SiO2 (I) has a CTAB surface area (to ASTM D 3765-92) of 200-400 m /g, a DBP no. (to ASTM D 2414) between 230 and 380 ml/100 g as powder and 180-250 g/100 g as granulate; a silanol gp. density (V2 consumption of NaOH) of 20-30 ml; and a typical macropore size distribution for each surface area, determined by HG porosimetry (DIN 66133) for certain pore size intervals (incremental plot). For CTAB surface areas of (A) 200-250, (B) 250-3300, (C) 300-400 m /g, the Hg consumption is (A) 0.27-0.49, (B) 0.35-0.50, (C) 0.32-0.42 ml/g for 10-20 nm pores; (A) 0.22-0.32, (B) 0.15-0.30, (C) 0.17-0.22 ml/g for 20-30 nm pores; (A) 0.15-0.21, (B) 0.12-0.17, (C) 0.12-0.15 ml/g for 30-40 nm pores; (A) 0.11-0.16, (B) 0.09-0.12, (C) 0.08-0.11 ml/g for 40-50 nm pores; and (A) 0.08-0.12, (B) 0.06-0.10, (C) 0.06-0.09 ml/g for 50-60 nm pores. Also claimed are vulcanisable rubber blends contg. 5-100, esp. 15-60 phr (I); and rubber blends and/or vulcanisates contg. opt. silane-modified (I).
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公开(公告)号:AT142986T
公开(公告)日:1996-10-15
申请号:AT94111686
申请日:1994-07-27
Applicant: DEGUSSA
Inventor: ESCH HEINZ , KUHLMANN ROBERT , NEUMUELLER MATTHIAS , OTTO KARIN DR , RAUSCH RALF DR
IPC: A61K8/00 , A61K8/25 , A61Q11/00 , C01B33/193
Abstract: Precipitated silica having a BET surface area of 10-130 m /g, a CTAB surface area of 10-70 m /g, a mean particle diameter of 5-20 mu m, a Cu abrasion in 10% strength glycerol (glycerine) dispersion of 4-50 mg and a thickening behaviour in CMC solution (20% strength dispersion) of 300-3500 mPa.s is prepared by simultaneously adding alkali metal silicate (weight ratio SiO2: alkali metal oxide = 2.5-3.9:1) and a mineral acid to an initial charge of water which has been adjusted to a pH of from 7.0 to 9.9 or from 10.0 to 10.7 by addition of water, keeping the pH constant between 7.0 and 9.9 or 10.0 and 10.7, with the initial precipitation temperature being 50-90 DEG C and a viscosity increase commencing at the latest after 25% of the precipitation time, setting the pH to /= 160 g/l to 240 g/l, separating off the solid by filtration and washing, drying and milling it. The precipitated silica can be used as abrasive and/or thickening component in toothpastes.
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公开(公告)号:ZA964505B
公开(公告)日:1996-09-03
申请号:ZA964505
申请日:1996-05-31
Applicant: DEGUSSA
Inventor: GOERL UDO , KUHLMANN ROBERT , ESCH HEINZ , HUNSCHE ANDREA , SIRAY MUSTAFA
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公开(公告)号:AU665913B2
公开(公告)日:1996-01-18
申请号:AU6893294
申请日:1994-08-05
Applicant: DEGUSSA
Inventor: ESCH HEINZ , KUHLMANN ROBERT , NEUMULLER MATTHIAS , OTTO KARIN , RAUSCH RALF
IPC: A61K8/00 , A61K8/25 , A61Q11/00 , C01B33/193 , C01B33/187
Abstract: Precipitated silica having a BET surface area of 10-130 m /g, a CTAB surface area of 10-70 m /g, a mean particle diameter of 5-20 mu m, a Cu abrasion in 10% strength glycerol (glycerine) dispersion of 4-50 mg and a thickening behaviour in CMC solution (20% strength dispersion) of 300-3500 mPa.s is prepared by simultaneously adding alkali metal silicate (weight ratio SiO2: alkali metal oxide = 2.5-3.9:1) and a mineral acid to an initial charge of water which has been adjusted to a pH of from 7.0 to 9.9 or from 10.0 to 10.7 by addition of water, keeping the pH constant between 7.0 and 9.9 or 10.0 and 10.7, with the initial precipitation temperature being 50-90 DEG C and a viscosity increase commencing at the latest after 25% of the precipitation time, setting the pH to /= 160 g/l to 240 g/l, separating off the solid by filtration and washing, drying and milling it. The precipitated silica can be used as abrasive and/or thickening component in toothpastes.
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公开(公告)号:BR9404019A
公开(公告)日:1995-06-27
申请号:BR9404019
申请日:1994-10-07
Applicant: DEGUSSA
Inventor: ESCH HEINZ , GOERL UDO DR , KUHLMANN ROBERT , RAUSCH RALF DR
IPC: C01B33/12 , C01B33/187 , C01B33/193 , C08J3/24 , C08K3/00 , C08K3/36 , C08L21/00 , C08L83/04
Abstract: A precipitate of silica having the following physicochemical parameters: BET surface area: from 35 to 350 m /g Ratio of BET/CTAB surface area: from 0.8 to 1.1 Pore volume PV: from 1.6 to 3.4 ml/g Silanol group density (V2 = consumption of NaOH): from 6 to 20 ml Mean aggregate size: from 250 to 1500 nm CTAB surface area: from 30 to 350 m /g DBP number: from 150 to 300 ml/100 g V2/V1 according to Hg porosimetry: from 0.19 to 0.46 DBP/CTAB: from 1.2 to 2.4 is prepared by reacting alkali metal silicate with mineral acids at temperatures of from 60 to 95 DEG C while maintaining a pH of from 7.5 to 10.5 with continuous stirring, continuing the reaction to a solids concentration in the precipitate suspension of from 80 to 120 g/l, adjusting the pH to a value equal to or less than 5, filtering off, washing, drying and, if desired, milling or granulating the precipitated silica. The precipitated silica is used as filler in vulcanisable rubber mixtures and vulcanisates.
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公开(公告)号:NO942882L
公开(公告)日:1995-02-08
申请号:NO942882
申请日:1994-08-03
Applicant: DEGUSSA
Inventor: ESCH HEINZ , KUHLMANN ROBERT , NEUMULLER MATTHIAS , OTTO KARIN , RAUSCH RALF
IPC: A61K8/00 , A61K8/25 , A61Q11/00 , C01B33/193 , C01B33/18
Abstract: Precipitated silica having a BET surface area of 10-130 m /g, a CTAB surface area of 10-70 m /g, a mean particle diameter of 5-20 mu m, a Cu abrasion in 10% strength glycerol (glycerine) dispersion of 4-50 mg and a thickening behaviour in CMC solution (20% strength dispersion) of 300-3500 mPa.s is prepared by simultaneously adding alkali metal silicate (weight ratio SiO2: alkali metal oxide = 2.5-3.9:1) and a mineral acid to an initial charge of water which has been adjusted to a pH of from 7.0 to 9.9 or from 10.0 to 10.7 by addition of water, keeping the pH constant between 7.0 and 9.9 or 10.0 and 10.7, with the initial precipitation temperature being 50-90 DEG C and a viscosity increase commencing at the latest after 25% of the precipitation time, setting the pH to /= 160 g/l to 240 g/l, separating off the solid by filtration and washing, drying and milling it. The precipitated silica can be used as abrasive and/or thickening component in toothpastes.
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公开(公告)号:DK160815B
公开(公告)日:1991-04-22
申请号:DK152382
申请日:1982-04-02
Applicant: DEGUSSA
Inventor: NAUROTH PETER , KUHLMANN ROBERT , TUERK GUENTER , BECKER ADAM
IPC: C01B33/20 , A61K8/00 , A61K8/25 , A61Q11/00 , C01B33/187 , C01B33/193 , C01B37/02 , C08K3/00 , C08K3/34 , C08K3/36 , C08K7/18 , C08L7/00 , C08L21/00 , C09C1/30
Abstract: Precipitated silicas which have the following physicochemical characteristics, depending on the manner in which they are milled: -Pendulum -roller mill Jet mill -BET m2/g 15-110 15-110 -surface -area -Tamped g/l 150-750 90-650 -den- -sity -Cu abrasion in 10% mg 5-30 5-30 -strength glycerol -dispersion -Lightness % 86-96 90-96 -value -A -Particle size dis- as in FIG. 1 as in FIG. 2 -tribution curve -determined by a -Coulter Counter -"ALPINE screen retain- % by 63 mu m weight -Viscosity of a 30% mPa.s 30,000 to 60,000 -strength dispersion in -a 1:1 glycerol/water -mixture (Brookfield -RTV, Sp5) - are prepared by diluting a precipitated silica original suspension obtained according to German Published Application DAS 1,467,019 and simultaneously adding alkali metal silicate solution, sulfuric acid and water while keeping the pH constant between 7 and 9. The precipitated silica is then filtered off, washed, dried and milled using a pendulum roller mill or a jet mill. Because of their abrasiveness, the precipitated silicas can be employed as cleansing and abrasive agents and, in the case of the jet-milled product, also as a polishing agent, abrasive and thickener in toothpastes.
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