Patent ID: 8512595
Filing Date: 2013-08-20
Classification: B82Y,C01P,C08K,C09C,C09D,Y10T

Abstract:
1. A surface-modified, pyrogenically prepared silica which is easily incorporated into liquid resin systems, the surface modification consisting of a pyrogenic silica surface having trimethylsilyl groups; the surface modified silica being obtained by a process comprising: treating a pyrogenically prepared silica with a silane surface modifier consisting of hexamethyldisilazane; wherein the pyrogenically prepared silica comprises aggregates of primary particles having a BET surface area of 300±25 m an average area of the aggregates is from 4800 to 6000 nm an average equivalent circle diameter (ECD) of the aggregates is from 60 to 80 nm and an average circumference of the aggregates is from 580 to 750 nm.