Abstract: A pipe, the inner surface of which is lined with a thermoplastic layer, is produced by a process comprising the following steps: a) a metal pipe is provided, b) a tubular inliner composed of a thermoplastic material is provided, c) a tape is cohesively helically bonded to the inliner, wherein the region of the contact surface of the tape consists of a moulding composition or an adhesive which adhere firmly to the surface of the inliner, and wherein the region of the opposing surface of the tape consists of a moulding composition or an adhesive which adhere firmly to the metal of the pipe, wherein the tape contains unidirectional reinforcing fibers; d) the cross section of the inliner is optionally reduced by exposure to an external force, e) the inliner is inserted into the metal pipe, f) by means of contact pressure and optionally heat, the inliner and metal pipe are firmly bonded to each other.

Abstract: The present invention relates to a moulding compound which contains at least 50 wt. % of a semicrystalline poly amide component and the moulding compound contains a filler which imparts conductivity to the moulding compound, wherein the moulding compound does not have a crystallite melting point (Tm) below 50° C. and the polyamide component contains components A and B, A) PA homopolymer of the type PA X.Y or PAZ, where X is a diamine radical (DA), Y is a dicarboxyl radical (DC), and Z is an alpha-omega amino acid radical; B) PA copolymer of the type PA X?.Y?, where X is a diamine radical (DA?) and Y? is a dicarboxyl radical (DC?); wherein a portion of the diamine radical (DA?) is replaced by a polyether having at least two amino termini or at least two hydroxy termini; wherein the proportion of polyether in the sum of components A and Bis between 0.5 and 15 wt. % and wherein the proportion of filler is 2.5 to 6 wt. % based on the total mass of the poly amide component and the filler.

Abstract: A process for producing a thermoplastic composite pipe, where the process includes: a) providing a tubular liner having a wall containing a thermoplastic polymer A in the region of the outer surface; b) providing a tape containing reinforcing fibres in a matrix containing a thermoplastic polymer B, where polymer A and polymer B are different; c) applying a film or a composite which is produced in d) and is composed of a film and a tape provided in step b) to the tubular liner, with melting of the outer surface of the liner and of the contact surface of the film either beforehand, simultaneously or thereafter, d) applying the tape provided in b) to the outer surface of the film, with melting of the outer surface of the film applied and of the contact surface of the tape either beforehand, simultaneously or thereafter, where the surface of the film which is brought into contact with the liner contains a moulding compound containing polymer A to an extent of at least 30% by weight, and the opposite surface of

Abstract: A laser markable polymer composite contains (a) a polyamide component as the matrix and (b) carbon black as a laser-sensitive additive. The polyamide component has, based on the total weight thereof, at least 50 wt % a poly amide selected from a linear aliphatic polyamide (a1) or (a2), a cycloaliphatic polyamide (a3), a semi-aromatic polyamide (a4) or (a5), and the compound or copolymer thereof. The carbon black is present in an amount of 50-300 ppm, based on the total weight of the polymer composite. The composite results in better chemical resistance than conventional polycarbonate as the matrix, in addition to a desired quality of laser marking, specifically sharpness and resolution. This composite can also be used for a moulded article made of the laser markable polymer composite, a layered structure with at least one layer made of the laser markable polymer composite, and a security and/or valuable document with the layered structure.

Abstract: A pipe, the inner surface of which is lined with a thermoplastic layer, is produced by a process comprising the following steps: a) a metal pipe is provided, b) a tubular inliner composed of a thermoplastic material is provided, c) a tape is cohesively helically bonded to the inliner, wherein the region of the contact surface of the tape consists of a moulding composition or an adhesive which adhere firmly to the surface of the inliner, and wherein the region of the opposing surface of the tape consists of a moulding composition or an adhesive which adhere firmly to the metal of the pipe, wherein the tape contains unidirectional reinforcing fibers; d) the cross section of the inliner is optionally reduced by exposure to an external force, e) the inliner is inserted into the metal pipe, f) by means of contact pressure and optionally heat, the inliner and metal pipe are firmly bonded to each other.

Abstract: A process for producing a thermoplastic composite pipe, where the process includes: a) providing a tubular liner having a wall containing a thermoplastic polymer A in the region of the outer surface; b) providing a tape containing reinforcing fibres in a matrix containing a thermoplastic polymer B, where polymer A and polymer B are different; c) applying a film or a composite which is produced in d) and is composed of a film and a tape provided in step b) to the tubular liner, with melting of the outer surface of the liner and of the contact surface of the film either beforehand, simultaneously or thereafter, d) applying the tape provided in b) to the outer surface of the film, with melting of the outer surface of the film applied and of the contact surface of the tape either beforehand, simultaneously or thereafter, where the surface of the film which is brought into contact with the liner contains a moulding compound containing polymer A to an extent of at least 30% by weight, and the opposite surface of

Abstract: The invention relates to plastics composite moldings obtainable via welding in an alternating electromagnetic field, in which the weld is obtained with the aid of a plastics material which comprises nano-scale, magnetic oxidic particles, which are composed of aggregated primary particles, and where the primary particles are composed of magnetic metal oxide domains whose diameter is from 2 to 100 nm in a non-magnetic metal oxide matrix or non-magnetic metalloid oxide matrix.

Abstract: Multilayer composites are obtained from a molding composition which contains the following components: a) 100 parts by weight of polyamide and b) from 0.005 to 10 parts by weight of a compound having at least two carbonate units by coextruding with a molding composition based on a high-melting-point polymer whose crystallite melting point Tm is at least 255° C. and/or whose glass transition temperature Tg is at least 180° C.

Abstract: The invention relates to a downhole heat exchanger for extracting geothermal energy from a borehole, wherein the inner surface of the exchanger tube comprises the following roughness values: a) an arithmetic mean roughness Ra according to DIN EN ISO 4287 in the range of 1 to 15 ?m, b) an averaged roughness Rz according to DIN EN ISO 4287 in the range of 8 to 80 ?m, and c) a maximum roughness depth Rz1 max according to DIN EN ISO 4287 in the range of 10 to 500 ?m, comprising an improved precipitation film during operation, such that the entire surface of the exchanger tube is uniformly wetted.

Abstract: A pipe or hose composed of a polyamide moulding composition whose molecular weight has been increased by condensation, via addition of a compound having at least two carbonate units in a quantitative proportion of from 0.005 to 10% by weight, based on polyamide, where a) a starting polyamide moulding composition was provided, b) a mixture of the starting polyamide moulding composition and of the compound having at least two carbonate units was produced, c) the premix was, if desired, stored and/or transported, and d) the premix was then processed to give the moulding, this step being the first in which the increase of molecular weight by condensation occurred, the moulding being a pipe or hose whose external diameter is at least 25 mm is used as inliner for a pipeline.

Abstract: A process for the bonding of a plastics pipe to another plastics part by ultrasound welding using sound waves which act longitudinally with respect to the pipe axis, while the arrangement of the areas to be welded is substantially parallel to the pipe axis. The welding procedure is combined with the forced insertion of the other plastics part into the plastics pipe in such a way that there is at least some overlap between the exposure to sound and the forced insertion.