Abstract: Monofilament string suited for use in tennis rackets and the like, consisting of a core material and a covering material that serves as a matrix, in which the core material is embedded in the covering material in accordance with the ‘island in the sea structure’ and that therefore contains island components and a sea component, whereby the island components largely but not exclusively consist of a thermoplastic polymer; are arranged in a geometrical and preferably symmetrical pattern relative to each other and/or the longitudinal axis of the string; and at least three of the island components have a cross-section that has a multi-angular shape, with one side leaning close against the surface of the string. The one side has a curvature that closely lines the curve of the string surface, and the sea component largely but not exclusively consists of a thermoplastic elastomer.

Abstract: Method for spinning polyether block amides (PEBAs) into fibers, whereby use is mainly made of at least one extruder, a cooling system, a sequential line for stretching, a relaxation unit, a heating unit and a winding system, characterized in that polyether block amides are taken as a base material whose initial hardness is situated between shore D15 and 80, better still between shore D20 and 75, even better between shore D27 and 69, and in that the stretched fibers are subjected to a temperature treatment in a heating unit before being wound, whereby their shrinkage is reduced to 0-10%, better still to 0-5% and even better to 0-3%.

Abstract: Monofilamentous string suited for use in tennis rackets and the like, consisting of a core material and a covering material that serves as a matrix, in which the core material is embedded in the covering material in accordance with the ‘island in the sea structure’ and that therefore contains island components and a sea component, therefore characterised in that the island components largely but not exclusively consist of a thermoplastic plastic, that they are arranged in a geometrical and preferably symmetrical pattern relative to each other and/or the longitudinal axis of the string, that at least three of these island components have a cross-section that has a multi-angular shape and with one side leaning close against the surface of the string, and that this side displays a curvature that closely lines the curve of this surface, and that the sea component largely but not exclusively consists of a thermoplastic elastomer.

Abstract: Polymer string mainly but not exclusively consisting of one or several plastics, characterised in that at least one plastic consists of a thermoplastic material in which at least one alkylbenzyl ester of a 1,2 dicarboxylic acid or one of its derivates is distributed homogeneously, that the alkyl chain of the alkyl-benzyl ester or one of its derivates consists of at least five carbon atoms, and that it is used in a concentration between 0.1 to 5 percent by weight, better between 0.3 to 4 percent by weight, and even better between 0.3 to 1.2 percent by weight.