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