Polyetheretherketones

Abstract

Polyether ether ketone copolymers can have the following formula (I), Therein, Ar1 contains 75 to 98 mol %, preferably 78 to 97 mol %, of 1,4-phenylene groups and 2 to 25 mol %, preferably 3 to 22 mol %, of X,Y-naphthylene groups. In the X,Y-naphthylene groups, X≠Y, X and Y independently of one another are an integer value of 1 to 10, and 2,7-naphthylene groups are excluded. The mol % values relate to the amount of substance of Ar1, wherein all Ar1 groups sum to 100 mol %. The constituent Ar2 contains 2,2′-bisphenylmethanone groups, 2,4′-bisphenylmethanone groups, 3,3′-bisphenylmethanone group, 4,4′-bisphenylmethanone groups, or mixtures thereof, preferably 4,4′-bisphenylmethanone groups. The index n is 10 to 10,000. The copolymers have a reduced melting point and are suitable for producing three-dimensional objects in powder bed fusion processes.

Dependencies are inferred from the claim text.