Patent ID: 8552087

Claim:
Low viscosity composites having a depth of penetration of greater than 5 mm measured under ASTM D 1321, which, after curing, have a flexural modulus of at least 18 GPa and a flexural strength of at least 90 MPa comprising from 10 to 40% by weight of the polymerizable monomer mixture, from 40 to 70% by weight of a first filler comprising aluminum oxides, a first aluminum oxide having a mean particle size of 12-40 μm, and a second aluminum oxide having a mean particle size of 1 to 10 μm, from 10 to 45% by weight of at least one additional filler with a mean particle size of 0.5 to 5 μm chosen from the group consisting of glass, glass ceramic, quartz, composite, pyrogenic silicas, titanium dioxide, and zirconium dioxide, and from 0.001 to 3% by weight of initiators and additional additives, the percentages adding up to 100% by weight.