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    Process for the Production of a Precipitated Silica
    81.
    发明专利
    Process for the Production of a Precipitated Silica 未知

    公开(公告)号：CA2129607A1

    公开(公告)日：1995-02-08

    申请号：CA2129607

    申请日：1994-08-05

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

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

    IPC: A61K8/00 ,  A61K8/25 ,  A61Q11/00 ,  C01B33/193 ,  C01B33/12 ,  A61K7/16

    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.

    82.
    发明专利
    未知

    公开(公告)号：FI944679A0

    公开(公告)日：1994-10-06

    申请号：FI944679

    申请日：1994-10-06

    Applicant: DEGUSSA

    Inventor： ESCH HEINZ ,  GOERL UDO ,  KUHLMANN ROBERT ,  RAUSCH RALF

    IPC: C01B33/12 ,  C01B33/187 ,  C01B33/193 ,  C08J3/24 ,  C08K3/00 ,  C08K3/36 ,  C08L21/00 ,  C08L83/04 ,  C01B ,  C08L ,  C08K

    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.

    83.
    发明专利
    未知

    公开(公告)号：FI943648A0

    公开(公告)日：1994-08-05

    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 ,  C09C ,  A61K

    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.

    PRECIPITATED SILICIC ACIDS OF HIGH STRUCTURE,AND A METHOD OF THEIR PRODUCTION
    89.
    发明专利
    PRECIPITATED SILICIC ACIDS OF HIGH STRUCTURE,AND A METHOD OF THEIR PRODUCTION 未知

    公开(公告)号：ZA828158B

    公开(公告)日：1983-09-28

    申请号：ZA828158

    申请日：1982-11-05

    Applicant: DEGUSSA

    Inventor： NAUROTH PETER ,  ESCH HEINZ ,  TUERK GUENTER

    IPC: C01B33/18 ,  C01B33/12 ,  C01B33/158 ,  C01B33/187 ,  C01B33/193 ,  C01B33/20 ,  C01B37/02 ,  C04B30/00 ,  C08K3/00 ,  C08K3/34 ,  C08K3/36 ,  C08K5/00 ,  C08K5/36 ,  C08L7/00 ,  C08L23/00 ,  C08L101/00 ,  C01B ,  C09C ,  B01J ,  C08K ,  C08L ,  C09D

    Abstract: There are disclosed precipitated silicas which are characterized by the following physical-chemical data: -A B C -BET-surface area m2/g 400-600 400-600 400-600 -according to DIN 66131 -DBP-Number % 340-380 320-360 310-360 -Bulk density according g/l 180-220 75-120 35-70 -to DIN 53194 -"ALPINE-Sieve Wt. % 25-60 63 m mu - Depending on the particle distribution curve, these precipitated silicas can be employed as silica carriers for active materials of all types, as antiblocking agents for polypropylene and polyethylene films, as thickening silica in specific polar systems in which pyrogenic silicas show little thickening capacity, as highly active matting agents for varnishes and as catalyst carriers as well as insulating materials. The precipitated silicas are produced by establishing a silica final concentration of 46 grams/l in a receiver having water present heated to a temperature of 40 DEG -42 DEG C. while holding the pH constant in the range of 6-7 by simultaneously running in a water glass solution and sulfuric acid while maintaining shearing with an Ekato Turbine over the entire precipitation time, interrupting the precipitation for 90 minutes from the 13th to 103rd minute according to a total precipitation of 146 minutes, aging the suspension of precipitated silica for 12-17 hours, separating the precipitated silica from the suspension with the help of a filter press, washing, liquifying the filter cake with water and/or acid to a suspension having 10-16 weight % solids, finally spray drying and either not grinding or grinding with a cross flow mill or jet mill.

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