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US 6,143,852 AGranted
Copolymers for rapid prototyping
AssigneeBayer Aktiengesellschaft
InventorsDavid Bryan Harrison, Wolfgang Podszun
Life of this patent
Estimating the term…
Abstract
This invention relates to spherical methyl methacrylate copolymers with an average particle size of 6 to 50 .mu.m and a narrow particle size distribution, and to a method of producing them. The invention further relates to the use of these spherical copolymers for the production of 3-D models by laser sintering.
Claims6
Spherical methyl methacrylate copolymers, the structural units of which includes
- a) 90 to 50 percent of methyl methacrylate, and
- b) 10 to 50 percent of at least one C.sub.2-10 -alkyl methacrylate,
- said percent, both occurrences, being relative to the weight of said copolymer, said copolymer being in the form of substantially spherical pellets having a volume average particle size of 6 to 50 microns, and a breadth of the particle size distribution of less than 2.0.
Dependencies are inferred from the claim text.