C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/192
C01B 33/12 (2006.01) C01B 33/193 (2006.01) C04B 30/00 (2006.01) C08K 3/36 (2006.01)
Patent
CA 1194272
ATTRACT OF THE DISCLOSURE Precipitated silicas which are characterized by the following physicochemical characteristic data: BET surface area accord- ing to DIN 66131 sqm/g 400-600 400-600 400-600 DBP number % 340-380 320-360 310-360 tamped density accord- ing to DIN 53194 g/litre 180-220 75-120 35-70 "ALPINE retained on sieve" >63 µm % by weight 25-60 <0.1 <0.01 Depending on the particle size distribution curve these pre- cipitated silicas can be used as support catalysts for all kinds of active substances, as antiblocking agents for poly- propylene and polyethylene sheeting, as thickening silicas in specific polar systems in which pyrogenic silicas show low thickening performance, as highly effective dulling agents for lacquers and varnishes and as catalyst supports and also as insulating materials. The precipitated silicas are pro- duced by a process in which sodium tetrasilicate solution and sulphuric acid are simultaneously fed into water heated to a temperature of 40 to 42°C while keeping a pH value con- stant in the range of 6 to 7 and while shearing continuously over the entire precipitating time with an Ekato turbine and by interrupting the precipitation for 90 minutes from the 13th to the 103rd minute, whereupon a final silica concentra- tion of 46 g per litre is obtained after a total precipitat- ing time of 146 minutes, the precipitated silica is aged for 12-17 hours, the precipitated silica is separated from the suspension with a filter press and washed and the filter cake is liquefied with water and/or acid to a suspension con- taining 10 to 16% by weight of solids and then washed and ground with a cross current mill or jet mill or not ground at all.
414998
Esch Heinz
Nauroth Peter
Turk Gunter
Aktiengesellschaft Degussa
Marks & Clerk
LandOfFree
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