Producing a three-dimensional object by selectively sintering a polymer powder comprises using a polymer that has a branching group in the main chain, has a modified terminal group and/or has a bulky group in the main chain

摘要

Producing a three-dimensional object by selectively sintering a polymer powder with electromagnetic radiation comprises using a polymer that has a branching group in the main chain, has a modified terminal group and/or has a bulky group in the main chain. When the polymer is a polyaryletherketone, the branching group is an aromatic structural unit and the bulky group is not a phenylene, biphenylene, naphthalene or methylene- or isopropylidene-linked aromatic group. Independent claims are also included for: (1) a three-dimensional object produced as above; (2) apparatus for producing a three-dimensional object by selectively sintering a polymer powder with electromagnetic radiation, comprising a temperature control unit designed to provide predetermined cooling of the object after the end of production.