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 10000. The copolymers have a reduced melting point and are suitable for producing three-dimensional objects in powder bed fusion processes.

Abstract: A process for the production of a pipe comprising: an interior surface having a shape; and a thermoplastic inliner is provided. The process comprises: introducing the thermoplastic inliner into the interior of the pipe; heating the pipe from the outside to a temperature higher than a crystallite melting point (Tm) of a molding composition of an exterior surface of the inliner; expanding the inliner radially in the pipe so that an exterior surface of the inliner assumes the shape of the interior surface of the pipe; and cooling the inliner; wherein a cross section of the inliner is optionally reduced through exposure to an exterior force prior to being introduced into the pipe. Relative movements between carrier pipe and inliner are thus prevented; the risk of collapse of the inliner is moreover low. The pipe is used for the production of a laid pipeline.

Abstract: A process for the production of a pipe comprising: an interior surface having a shape; and a thermoplastic inliner is provided. The process comprises: introducing the thermoplastic inliner into the interior of the pipe; heating the pipe from the outside to a temperature higher than a crystallite melting point (Tm) of a moulding composition of an exterior surface of the inliner; expanding the inliner radially in the pipe so that an exterior surface of the inliner assumes the shape of the interior surface of the pipe; and cooling the inliner; wherein a cross section of the inliner is optionally reduced through exposure to an exterior force prior to being introduced into the pipe. Relative movements between carrier pipe and inliner are thus prevented; the risk of collapse of the inliner is moreover low. The pipe is used for the production of a laid pipeline.

Abstract: The present invention provides electrospun polymer fibers comprising bacteria-containing hydrogel particles. Bacteria-containing hydrogel particles are produced by crosslinking water-soluble polymers to form hydrogels and mixing them with a bacteria suspension. The crosslinking is suitable to be carried out either chemically before the addition of the bacteria suspension or physically before or after this addition. Subsequently, these hydrogel particles are electrospun together with an electrospinnable polymer solution to form fibers or fibre non-wovens. The bacteria which are located in these hydrogel particles or in the electrospun polymer fibers comprising these particles, respectively, are capable of surviving for a long period (several months) without the supply of water or cell-culture media and are simultaneously protected against the effect of solvents, for example alcohols, acetone, chlorinated hydrocarbons, ethers and toluene, which would otherwise kill said bacteria.