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    • 6. 发明专利
    • BRPI0603907A
    • 2007-04-27
    • BRPI0603907
    • 2006-09-06
    • DEGUSSA
    • STENZEL OLEGLUGINSLAND HANS-DETLEFUHRLANDT STEFANWEHMEIER ANDRE
    • C01B33/12C08C19/25C09C1/30C09C3/12
    • Preparation of precipitated silicic acid comprises (a) subjecting an aqueous solution of an alkali- and/or earth alkaline silicate and/or an organic or inorganic base; (b) simultaneously adding an alkali- and/or alkaline-earth silicate and an acidifying agent to increase the viscosity; (c) terminating the reaction after 35-85 minutes; (d) simultaneously adding an alkali- and/or alkaline-earth silicate and an acidifying agent to attain a solid content; (e) stirring the obtained suspension; (f) adjusting the pH by adding the acidifying agent; and (g) filtering and (h) drying. Preparation of precipitated silicic acid comprises: (a) subjecting an aqueous solution of an alkali- and/or earth alkaline silicate and/or an organic or inorganic base, where the subjected mixture exhibits the alkali number of 20-40; (b) simultaneously adding an alkali- and/or earth alkaline silicate under stirring at 55-85[deg]C and an acidification agent to increase the viscosity of the mixture; ( (c) terminating the reaction after the addition of mixture that takes place for 35-85 minutes, preferably after reacting the temperature of step (b); (d) simultaneously adding an alkali- and/or alkaline-earth silicate and an acidifying agent under agitation at 55-85[deg]C, to attain a solid content of 90-140 g/l; (e) stirring the obtained suspension for 1-120 minutes at 80-98[deg]C; (f) adjusting the pH of the solution to 2.5-5 by adding the acidifying agent; (g) filtering; and (h) drying. Independent claims are included for: (1) a precipitated silicic acid exhibiting physical-chemical parameters such as relative width (gamma ) of the pore size distribution of 4-10 (g nm)/ml, Brunauer, Emmett and Teller (BET)-surface 90-320 m 2>/g, cetylammonium bromide (CTAB) surface area of 100-200 m 2>/g, sears number (V2) of 25-40 ml/(5 g) and sears number (V2/CTAB) ratio of 0.18-0.28 ml/(5 m 2>); (2) a precipitated silicic acid, obtained by the above process; (3) a vulcanizable rubber mixtures and vulcanizate comprising the precipitated silicic acid as filler material; and (4) a tire, comprising at least a precipitated silicic acid.
    • 7. 发明专利
    • DE102005043201A1
    • 2007-03-15
    • DE102005043201
    • 2005-09-09
    • DEGUSSA
    • STENZEL OLEGBLUME ANKELUGINSLAND HANS-DETLEFSCHMOLL RALFTHOMA HERBERTUHRLANDT STEFANWEHMEIER ANDRE
    • C01B33/18B60C1/00C01B33/193C08K3/36C08L21/00C09C3/12
    • Precipitated silicic exhibiting physical-chemical properties such as relative width (gamma ) of the pore size distribution of 4-10 (g nm)/ml, sears number (V2) of 28-40 ml/(5 g), sears number (V2/CTAB) ratio of 0.18-0.28 ml/(5 m 2>) and cetylammonium bromide (CTAB) surface area of 100-200 m 2>/g. Independent claims are included for: (1) the preparation of precipitated silicic acid, comprising (a) subjecting an aqueous solution of alkali or alkaline-earth silicate and/or an organic or an inorganic base, where the submittal exhibited an alkali number of 20-40, (b) adding alkaline and/or alkaline-earth silicate and acidifying agent into the submittal under intensive stirring at 55-85[deg]C to increase viscosity of the solution, (c) terminating the reaction after the addition that takes place for 35-85 minutes, preferably after reaching the temperature of step (b), (d) again adding alkali and/or alkaline-earth silicate and an acidifying agent under agitation at 55-85[deg]C to attain a solid content of 90-140 g/l, (e) adjusting pH of the solution to 2.5-5 by adding the acidifying agent and (f) filtering and drying; (2) vulcanizable rubber mixture and vulcanizate comprising the precipitated silicic acid as filler; and (3) a tire comprising at least a precipitated silicic acid.