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    Process for the production of a precipitated silica
    83.
    发明专利
    Process for the production of a precipitated silica 未知

    公开(公告)号：ZA945890B

    公开(公告)日：1995-03-16

    申请号：ZA945890

    申请日：1994-08-05

    Applicant: DEGUSSA

    Inventor： NEUMUELLER HEINZ ESCH MATTHIAS ,  RAUSCH RALF ,  KUHLMANN ROBERT ,  OTTO KARIN

    IPC: A61K8/00 ,  A61K8/25 ,  A61Q11/00 ,  C01B33/193 ,  C01B

    Abstract: A process for the production of a precipitated silica which has a BET surface area of 10-130 m2/g, a CTAB surface area of 10-70 m2/g, an average particle diameter of 5-20 μm, a Cu abrasion value in a 10% glycerol dispersion of 4-50 mg and thickening behavior in a CMC solution (20% dispersion) of 300-3500 mPa.s, which is characterize in simultaneously adding alkali silicate (weight modulus SiO2:alkali oxide = 2.5-3.9:1) and a mineral acid to an initial amount of water which has been adjusted to a pH value of 7.0 to 9.9 or 10.0 to 10.7 by the addition of water glass, holding the pH value constant between 7.0 and 9.9 or 10.0 to 10.7 during addition, in which the initial precipitation temperature is 50-90℃ and an increase in viscosity occurs after at most 25% of the duration of precipitation, adjusting the pH value to ≦̸6, once a pH of 7.0 to 9.9 at the start of precipitation and a silica content of greater than 120 g/l or a pH of 10.0 to 10.7 at the start of precipitation and a silica content of greater than 150 g/l has been reached, separating the solid by filtration, washing, drying and grinding it to form a filtration cake or fluidized filtration cake.

    84.
    发明专利
    未知

    公开(公告)号：FI943648A

    公开(公告)日：1995-02-08

    申请号：FI943648

    申请日：1994-08-05

    Applicant: DEGUSSA

    Inventor： ESCH HEINZ ,  KUHLMANN ROBERT ,  NEUMUELLER MATTHIAS ,  OTTO KARIN ,  RAUSCH RALF

    IPC: A61K8/00 ,  A61K8/25 ,  A61Q11/00 ,  C01B33/193 ,  C01B33/143

    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.

    METHOD FOR THE PRODUCTION OF PRECIPITATED SILICAS
    85.
    发明专利
    METHOD FOR THE PRODUCTION OF PRECIPITATED SILICAS 未知

    公开(公告)号：DE3263713D1

    公开(公告)日：1985-06-27

    申请号：DE3263713

    申请日：1982-02-26

    Applicant: DEGUSSA

    Inventor： NAUROTH PETER ,  KUHLMANN ROBERT ,  TURK GUNTER DR ,  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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