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US 8,556,198 B2Granted
Glass powder having grain size distribution and process for the production thereof
AssigneeSchott AG
InventorsBastian Schoen, Ewald Mittermeier, Yvonne Pfluegler
Life of this patent
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Abstract
A glass powder is provided that includes, as the main component, powder particulates of glass having a mean particulate size of less than or equal to 1.5 μm, and which is free of particles having a particle size of greater than 10 μm. A process for the production of such a glass power is also provided. The glass powder is particularly suitable as a filler of plastic dental compositions, in particular dental composites.
Claims12
A process for producing a glass powder, comprising:
- wet grinding a starting material of glass in a mill with grinding bodies to produce a grinding slurry, the grinding bodies comprising a material that is the same as or has the same refractive index as the starting material to form a mixture of glass particulates and particles, and the grinding slurry having ground glass particles with a first particle distribution with a first mean particulate size of less than or equal to 1.5 μm and disruptive glass particles with a second mean particulate size of greater than 10 μm;
- and
- passing the grinding slurry through a net and/or sieve having a mesh size that corresponds substantially to a minimum diameter of the particles to be separated to remove the particles having a particle size of greater than 10 μm by separation, wherein the first particle distribution is preserved.
A process for producing a glass powder, comprising:
- selecting grinding bodies comprising a material that is the same as or has the same refractive index as a starting material of glass;
- wet grinding the starting material in a mill with the grinding bodies to produce a grinding slurry having ground glass particles with a first particle distribution having a first mean particulate size of less than or equal to 1.5 μm and disruptive glass particles with a second mean distribution particulate distribution having a particulate size of greater than 10 μm;
- and
- passing the grinding slurry through a net and/or sieve having a mesh size sufficient to remove particles having a particle size of greater than 10 μm by separation.
1 more element
Dependencies are inferred from the claim text.