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    SEDIMENTED SILICIC ACID CONTAINING ACTIVE MATERIAL, ITS PREPARATION AND ORAL HYGIENIC GOOD CONTAINING THE SAME
    1.
    发明专利
    SEDIMENTED SILICIC ACID CONTAINING ACTIVE MATERIAL, ITS PREPARATION AND ORAL HYGIENIC GOOD CONTAINING THE SAME 失效

    公开(公告)号：JPH11236325A

    公开(公告)日：1999-08-31

    申请号：JP34721498

    申请日：1998-12-07

    Applicant: DEGUSSA

    Inventor： ESCH HEINZ ,  KUHLMANN ROBERT ,  NEUMUELLER MATTIAS ,  OTTO KARIN ,  RAUSCH RALF DR ,  THOMAS KLAUS-PETER

    IPC: A61K8/21 ,  A61K8/25 ,  A61Q11/00 ,  A61K7/18

    Abstract: PROBLEM TO BE SOLVED: To prepare the subject silicic acid capable of satisfying requirements for a medicine concerning compatibility, rheology characteristics, sensory irritation and the like, capable of fixing an active material in an oral cavity and allowing the active material to be controllably released, and useful as an oral hygienic good such as a toothpaste by allowing the active material to be carried. SOLUTION: This precipitated silicic acid containing an active material can carry out the sustained lease of the active material [e.g. a fluoride ion-containing material such as an alkali (alkaline earth) metal fluoride and fluoroapatite], and is prepared, for example, by previously inserting water and the active material in a precipitation vessel, heating the obtained mixture at 50-100 deg.C, adding (Z) a sodium silicate solution to the heated mixture while keeping the temperature to regulate the pH or the alkali metal content of the mixture, further adding the component Z and sulfuric acid while keeping the pH or the content of the alkali metal constant, further adding the sulfuric acid to acidify the obtained mixture so as to have pH 7, optionally carrying out an after-stirring of the resultant mixture, filtering and washing the resultant mixture, redispersing the obtained filtration cake, drying the redispersed filtration cake by a spray drier, and pulverizing the obtained dried silicic acid granule.

    PRECIPITATED SILIC ACIDS, METHOD OF OBTAINING THEM AND VULCANISABLE RUBBER COMPOUNDS
    8.
    发明专利
    PRECIPITATED SILIC ACIDS, METHOD OF OBTAINING THEM AND VULCANISABLE RUBBER COMPOUNDS 未知

    公开(公告)号：PL314565A1

    公开(公告)日：1996-12-09

    申请号：PL31456596

    申请日：1996-05-31

    Applicant: DEGUSSA

    Inventor： GOERL UDO ,  HUNSCHE ANDREA ,  KUHLMANN ROBERT ,  SIRAY MUSTAFA ,  ESCH HEINZ

    IPC: C01B33/193 ,  C01B33/187 ,  C08K3/00 ,  C08K3/36 ,  C08K9/00 ,  C08K9/06 ,  C08L21/00 ,  C09C1/30

    Abstract: - Pptd. SiO2 (I) has a CTAB surface area (to ASTM D 3765-92) of 200-400 m /g, a DBP no. (to ASTM D 2414) between 230 and 380 ml/100 g as powder and 180-250 g/100 g as granulate; a silanol gp. density (V2 consumption of NaOH) of 20-30 ml; and a typical macropore size distribution for each surface area, determined by HG porosimetry (DIN 66133) for certain pore size intervals (incremental plot). For CTAB surface areas of (A) 200-250, (B) 250-3300, (C) 300-400 m /g, the Hg consumption is (A) 0.27-0.49, (B) 0.35-0.50, (C) 0.32-0.42 ml/g for 10-20 nm pores; (A) 0.22-0.32, (B) 0.15-0.30, (C) 0.17-0.22 ml/g for 20-30 nm pores; (A) 0.15-0.21, (B) 0.12-0.17, (C) 0.12-0.15 ml/g for 30-40 nm pores; (A) 0.11-0.16, (B) 0.09-0.12, (C) 0.08-0.11 ml/g for 40-50 nm pores; and (A) 0.08-0.12, (B) 0.06-0.10, (C) 0.06-0.09 ml/g for 50-60 nm pores. Also claimed are vulcanisable rubber blends contg. 5-100, esp. 15-60 phr (I); and rubber blends and/or vulcanisates contg. opt. silane-modified (I).

    9.
    发明专利
    未知

    公开(公告)号：DE59400068D1

    公开(公告)日：1996-02-01

    申请号：DE59400068

    申请日：1994-09-27

    Applicant: DEGUSSA

    Inventor： ESCH HEINZ ,  GOERL 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.

    Process for the production of a precipitated silica
    10.
    发明专利
    Process for the production of a precipitated silica 未知

    公开(公告)号：AU6893294A

    公开(公告)日：1995-05-11

    申请号：AU6893294

    申请日：1994-08-05

    Applicant: DEGUSSA

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

    IPC: A61K8/00 ,  A61K8/25 ,  A61Q11/00 ,  C01B33/193 ,  C01B33/187

    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.

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