Precipitated silicas having a narrow particle size distribution

摘要

The present invention provides silica particles, which include the following physical properties: BET surface area: 100-700 m2/g; DBP absorption: 100-500 g/100 g; tamped density: 100-250 g/l; ALPINE sieve residue>63mu: <5%; and particle sizes (cumulative volume distribution): d95<40 mum; d50<20 mum; and d5<10 mum. The present invention also provides a process for producing silica having a narrow particle size distribution, which includes drying a silica suspension in a pulse combustion dryer to produce silica particles having the following particle size distribution (cumulative volume distribution): d5<10 mum; d50<20 mum; and d95<40 mum.