A process for {TAIL ~ the manufacture} of highly dispersed silicon dioxide with {HEAD ~ improved thickening action} by treatment of pyrogenically produced silicic acid comprising the following steps: 
A process for { TAIL ~ the manufacture } of highly dispersed silicon dioxide with { HEAD ~ improved thickening action } by treatment of pyrogenically produced silicic acid comprising the following steps :
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH