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    31.
    发明专利
    未知

    公开(公告)号：ES2081223T3

    公开(公告)日：1996-02-16

    申请号：ES94115165

    申请日：1994-09-27

    Applicant: DEGUSSA

    Inventor： ESCH HEINZ ,  GORL 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.

    32.
    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.

    36.
    发明专利
    未知

    公开(公告)号：DK160815C

    公开(公告)日：1991-10-07

    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.

    37.
    发明专利
    未知

    公开(公告)号：BR8202032A

    公开(公告)日：1983-03-22

    申请号：BR8202032

    申请日：1982-04-07

    Applicant: DEGUSSA

    Inventor： NAUROTH PETER ,  KUHLMANN ROBERT ,  TURK GUNTHER ,  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 ,  C01B33/12

    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.

    40.
    发明专利
    未知

    公开(公告)号：DE3005137A1

    公开(公告)日：1981-08-20

    申请号：DE3005137

    申请日：1980-02-12

    Applicant: DEGUSSA

    Inventor： NAUROTH PETER ,  KUHLMANN ROBERT ,  TUERK GUENTER DIPL CHEM DR ,  BODE RUDOLF DIPL PHYS ,  REISERT ARTHUR

    IPC: C08K3/00 ,  C01B33/12 ,  C01B33/187 ,  C01B33/193 ,  C01B33/20 ,  C08K3/22 ,  C08K3/34 ,  C08K3/36 ,  C08L83/00 ,  C08L83/04 ,  C09C1/30 ,  C08L83/06

    Abstract: Cerium containing precipitated silica is disclosed as well as a process for its production as well as compositions hardenable to elastomers which contain the cerium containing precipitated silica. The precipitated silica -BET-surface area according -to DIN 66 131 m2/g 140 +/- 40 -Loss on drying according -to DIN 55 921 Wt.-% 2.0-4.0 -Loss on ignition according -to DIN 55 921 Wt.-% 2.5-12.5 -pH-according to DIN 53 200 3.0-7.0 -Conductivity in 4% aqueous -dispersion at 20 DEG C. mu s 500 -Packed density according -to DIN 53 194 g/l 80 +/- 40 -CeO2-content, based on the -material dried for 2 -hours at 105 DEG C. Wt.-% 0.3-50 -Sieve residue according -to Mocker 45 mu m -(DIN 53 580) Wt.-% 0.2 - They are prepared by adding a cerium (IV) salt solution to the original precipitated suspension of a precipitated silica. The compositions produced with the cerium containing precipitated silica hardenable elastomers based on diorganopolysiloxanes exhibit excellent heat stability. Additionally, the cerium containing precipitated silica acts as a fire retardant agent.

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