| 摘要 |
PCT No. PCT/EP93/03093 Sec. 371 Date Jun. 15, 1995 Sec. 102(e) Date Jun. 15, 1995 PCT Filed Nov. 3, 1993 PCT Pub. No. WO94/11302 PCT Pub. Date May 26, 1994An amorphous silica has a pore size distribution wherein 90% of the pores have a diameter above 15 nanometers, and less than 20% of the pore volume is in pores having a pore diameter between 10 and 20 nanometers, the amorphous silica having a CTAB surface area of less than 100 m2/g, the amorphous silica having a matting efficiency of below 20 gloss units at an incidence angle of 60 DEG and a loading of 5% by weight. It can be prepared by a precipitation route. It is used in thixotropic paints and lacquers.
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