Laser-sintering powder containing titanium dioxide particles, process for its preparation, and moldings produced therefrom
AssigneeDegussa AG
InventorsFranz-Erich Baumann, Sylvia Monsheimer, Maik Grebe, Wolfgang Christoph, Thomas Schiffer, Heinz Scholten
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Abstract
A sintering powder containing polyamide polymer and titanium dioxide particles, a process for laser sintering, and moldings produced from the sintering powder. The moldings formed using the powder of the invention have improved surface quality due to the powders having increased yellowing resistance when exposed to thermal stress during laser sintering. Moldings produced from the sintering powder have improved mechanical properties, in particular modulus of elasticity.
Claims17
A laser sintering powder comprising (a) at least one polyamide;
- (b) titanium dioxide particles, and (c) at least one flow aid which is a precipitated and/or fumed silica, wherein the at least one polyamide is nylon-6,12, nylon-11, nylon-12, or mixtures thereof.
A process for producing moldings comprising:
- selectively laser-sintering a sintering powder comprising (a) at least one polyamide;
- and (b) titanium dioxide particles, wherein the at least one polyamide is nylon-6,12, nylon-11, nylon-12, or mixtures thereof.
A molding produced by laser sintering a powder which comprises titanium dioxide and at least one polyamide having a median particle size of from 40 to 250 μm, wherein the at least one polyamide is nylon-6,12, nylon-11, nylon-12, or mixtures thereof.
Dependencies are inferred from the claim text.