A method for internally siliconising of synthetic fibers, characterized in that polymeric siloxaanprodukten be added to the high polymer raw materials of these synthetic fibers, by making them evenly to inject the extruder, and good mixing, and then this mixture with vigorous stirring, heats strongly and evenly, then under continuously stirring, is allowed to cool again. Then, this raw material is - preferably in granular form - employed in the spinning process-extruder, in which one by a mechanical action on the cable standard spin gives rise to crystal defects, in the formation of the internally siliconized fiber. Internally siliconized synthetic fibers, having a smooth, permanently active by siliconising continuously to migration of the phymere siloxaanprodukten to the surface, as well as the raw material for its manufacture.
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