公开(公告)号：DE19840153A1

公开(公告)日：2000-04-20

申请号：DE19840153

申请日：1998-09-03

Applicant: DEGUSSA

Inventor： BLUME ANKE ,  FREUND BURKHARD ,  SCHWAIGER BERNHARD ,  SIRAY MUSTAFA ,  UHRLAND STEFAN

IPC: C01B33/021 ,  C01B33/193 ,  C08K3/36 ,  C08L21/00 ,  C09C1/30

Abstract: Precipitated silica with an aluminum oxide (Al2O3) content of 0.2-5.0 wt. % and a wk coefficient of less than 3.4. Independent claims are also included for: (a) a process for the production of this silica by reacting alkali silicate solution with mineral acid and aluminum salt solution in aqueous medium at 60-95 degrees C and pH 7.0-10.0 until the mixture has a solid content of 40-110 g/l, then adjusting to pH 3-5 and working up by known methods; and (b) vulcanizable rubber mixtures and vulcanized rubber containing this silica as filler.