Abstract: The invention provides a method for modifying the color hue of already colored synthetic yarns and/or filaments in a conventional melt-spinning process, which allows correcting deviations from tolerances in the color hue by the manufacturers themselves. The method comprises storing color coordinates of a target hue; measuring color coordinates of colored yarns and filaments to be corrected; comparing the data to provide deviations beyond tolerances; preparing a correcting-liquid-masterbatch composition; converting the deviations beyond tolerances into a dose of the correcting liquid-masterbatch composition; and adding such dose to molten mass of the synthetic yarns and filaments. The invention is also directed to a system suitable for performing the method of color hue modification and/or correction.

Abstract: The invention pertains to the field of synthetic-fibre production for the textile industry and relates to the design and use of a concentrated polymeric composition (“masterbatch”) comprising a polymer from the methacrylate family as a support polymer, representing between 30% and 99% by weight of the polymer composition; and at least one additive and/or pigment representing between 1% and 70% by weight of said composition. During the extrusion process, the composition of the invention is incorporated into the molten fibre and filament-forming polyester polymers in order to increase speed in the spinning process (productivity).

Abstract: The invention relates to a pigment preparation for coloring polymers. The inventive preparation comprises one or more pigments and a carrier. According to the invention, the carrier includes an oligomer or a combination of low-molecular-weight polymers from the group containing polymers and copolymers of ethylene-acrylic acid, ethylene-maleic anhydride or polypropylene-maleic anhydride. The carrier also includes a polymer from the group containing polymers of ethylene-ethyl acrylate, ethylene/butyl acrylate, ethylene/methacrylic acid, polypropylene with grafted methyl polymethacrylate, polypropylene with grafted polystyrene or block copolymers of styrene. For organic pigments, the preparation contains 50%-70% pigment and 50%-30% carrier. For inorganic pigments, the preparation contains 60%-90% pigment and 40%-10% carrier. The invention comprises a polyvalent pigment preparation which can be used in the production of color concentrates with specific bases and high precision.

Abstract: The invention relates to a pigment preparation for colouring polymers. The inventive preparation comprises one or more pigments and a carrier. According to the invention, the carrier includes an oligomer or a combination of low-molecular-weight polymers from the group containing polymers and copolymers of ethylene-acrylic acid, ethylene-maleic anhydride or polypropylene-maleic anhydride. The carrier also includes a polymer from the group containing polymers of ethylene-ethyl acrylate, ethylene/butyl acrylate, ethylene/methacrylic acid, polypropylene with grafted methyl polymethacrylate, polypropylene with grafted polystyrene or block copolymers of styrene. For organic pigments, the preparation contains 50%-70% pigment and 50%-30% carrier. For inorganic pigments, the preparation contains 60%-90% pigment and 40%-10% carrier. The invention comprises a polyvalent pigment preparation which can be used in the production of colour concentrates with specific bases and high precision.