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    1.
    发明专利
    未知

    公开(公告)号：DE3001573A1

    公开(公告)日：1981-07-23

    申请号：DE3001573

    申请日：1980-01-17

    Applicant: DEGUSSA

    Inventor： MUELLER KARL-HANS DIPL CHEM DR ,  TAILFER ROLAND ING GRAD ,  TUERK GUENTER DIPL CHEM DR

    IPC: B01D19/04 ,  C09C1/30

    Abstract: Precipitated, jet ground silica with specific physical-chemical properties is mixed with silicone oil, homogenized and heated to produce an antifoam agent. This type of antifoam agent can be used in pharmacy, in producing foam stopping latex emulsion, in the food field, in washing formulations, in the textile industry as well as in the pigment and varnish industries.

    2.
    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.

    3.
    发明专利
    未知

    公开(公告)号：DE3144299A1

    公开(公告)日：1983-05-19

    申请号：DE3144299

    申请日：1981-11-07

    Applicant: DEGUSSA

    Inventor： NAUROTH PETER ,  ESCH HEINZ ,  TUERK GUENTER DIPL CHEM DR

    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 ,  C09C1/30 ,  B01J21/08 ,  C09D7/02

    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.

    4.
    发明专利
    未知

    公开(公告)号：DE3114492A1

    公开(公告)日：1982-10-28

    申请号：DE3114492

    申请日：1981-04-10

    Applicant: DEGUSSA

    Inventor： MUELLER KARL-HANS DIPL CHEM DR ,  NEUMUELLER MATTHIAS ,  TUERK GUENTER DIPL CHEM DR

    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.

    5.
    发明专利
    未知

    公开(公告)号：DE3114493A1

    公开(公告)日：1982-10-28

    申请号：DE3114493

    申请日：1981-04-10

    Applicant: DEGUSSA

    Inventor： NAUROTH PETER ,  KUHLMANN ROBERT ,  TUERK GUENTER DIPL CHEM 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 ,  C01B33/18

    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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