中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

40 records (took 0.032 seconds)

    Process for the preparation of precipitated silica.
    32.
    发明专利
    Process for the preparation of precipitated silica. 未知

    公开(公告)号：GR3021417T3

    公开(公告)日：1997-01-31

    申请号：GR960402788

    申请日：1996-10-23

    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.

    33.
    发明专利
    未知

    公开(公告)号：DE4423493A1

    公开(公告)日：1995-02-09

    申请号：DE4423493

    申请日：1994-07-05

    Applicant: DEGUSSA

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

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

    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.

    38.
    发明专利
    未知

    公开(公告)号：NO159059B

    公开(公告)日：1988-08-22

    申请号：NO820879

    申请日：1982-03-17

    Applicant: DEGUSSA

    Inventor： MUELLER KARL-HANS ,  NEUMUELLER MATTHIAS ,  TUERK GUENTHER

    IPC: A61K8/00 ,  A61K8/25 ,  A61K8/86 ,  A61Q11/00 ,  A61K7/16

    Abstract: A dental-care composition having improved shelf life in respect of rheology and abrasiveness, which as a novel feature, contains, as a cleansing agent, a bifunctional (thickening and abrasive) precipitated silica characterized by the following physico-chemical properties: -Pendulum - roller - mill Jet mill -BET surface area m2/g 15-110 15-110 -Tamped density g/l 150-750 90-650 -Secondary particle size FIG. 1 FIG. 2 -distribution according to -Coulter Counter -"ALPINE" screen % by 63 mu m weight -Cu abrasion in 10% mg 5-30 5-30 -strength glycerol disper- -sion -Lightness value A % 86-96 90-96 -Viscosity in a 30% 30,000-60,000 30,000-60,000 -strength dispersion in a -1:1 glycerol/water -mixture, Brookfield RTV, -Sp5 - The dental-care composition may additionally contain 0.5-5% by weight of polyethylene glycol or 2-14% by weight of a precipitated silica which in 15% strength dispersion in a glycerol/water mixture has a viscosity of not less than 30,000 mPa.s. Pyrogenic silica can also be employed successfully to regulate the viscosity of the product.

    39.
    发明专利
    未知

    公开(公告)号：NO820879L

    公开(公告)日：1982-10-11

    申请号：NO820879

    申请日：1982-03-17

    Applicant: DEGUSSA

    Inventor： MUELLER KARL-HANS ,  NEUMUELLER MATTHIAS ,  TUERK GUENTHER

    IPC: A61K8/00 ,  A61K8/25 ,  A61K8/86 ,  A61Q11/00 ,  A61K

    Abstract: A dental-care composition having improved shelf life in respect of rheology and abrasiveness, which as a novel feature, contains, as a cleansing agent, a bifunctional (thickening and abrasive) precipitated silica characterized by the following physico-chemical properties: -Pendulum - roller - mill Jet mill -BET surface area m2/g 15-110 15-110 -Tamped density g/l 150-750 90-650 -Secondary particle size FIG. 1 FIG. 2 -distribution according to -Coulter Counter -"ALPINE" screen % by 63 mu m weight -Cu abrasion in 10% mg 5-30 5-30 -strength glycerol disper- -sion -Lightness value A % 86-96 90-96 -Viscosity in a 30% 30,000-60,000 30,000-60,000 -strength dispersion in a -1:1 glycerol/water -mixture, Brookfield RTV, -Sp5 - The dental-care composition may additionally contain 0.5-5% by weight of polyethylene glycol or 2-14% by weight of a precipitated silica which in 15% strength dispersion in a glycerol/water mixture has a viscosity of not less than 30,000 mPa.s. Pyrogenic silica can also be employed successfully to regulate the viscosity of the product.

Patent Agency Ranking