Patent ID: 7193355

Claim:
An aluminum oxide particle mixture, having a first mixture component comprising aluminum oxide particles with a grain size d 50 (1), measured using a CPS disk centrifuge, of 0.3 μm≦d 50 (1)≦0.5 μm, and a second mixture component comprising aluminum oxide particles having a very fine TEM-measured primary grain size d 50 (2) of d 50 (2)≦0.05 μm and a grain size measured using a CPS disk centrifuge of d 50,agg (2)≦0.15 μm, the first mixture component forming a relative proportion m(1) of m(1)≦86% by weight, and the second mixture component forming a relative proportion m(2) of 0% by weight≦m(2)<4% by weight.