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Nonaqueous additive systems which includes dispersant-coated pigments physically dispersed in a liquid nonaqueous polymeric carrier are added directly to a melt flow of a polymeric host material prior to spinning. The additive system is most preferably in the form of a particulate paste which can be

Nonaqueous additive systems which includes dispersant-coated pigments physically dispersed in a liquid nonaqueous polymeric carrier are added directly to a melt flow of a polymeric host material prior to spinning. The additive system is most preferably in the form of a particulate paste which can be added in metered amounts (dosed) to a melt flow of the polymeric host material prior to being spun into filaments. By providing a number of additive systems having a number of different additive attributes, and controllably dosing one or more into the melt flow of polymeric material, melt-spun filaments having different additive attributes may be produced on a continuous basis (i.e., without shutting down the spinning operation).

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[ What is claimed is:] [1.] A method of making pigmented filaments comprising:(i) supplying a melt flow of a melt-spinnable polymeric host material to the spinneret orifices;(ii) providing an additive system which is comprised of (1) a dispersant polymer, (2) solid pigment particles coated by said d

[ What is claimed is:] [1.] A method of making pigmented filaments comprising:(i) supplying a melt flow of a melt-spinnable polymeric host material to the spinneret orifices;(ii) providing an additive system which is comprised of (1) a dispersant polymer, (2) solid pigment particles coated by said dispersant polymer so as to form solid dispersant-coated pigments having an average particle size of greater than about 5 .mu.m, and (3) a liquid nonaqueous polymer carrier in which said solid dispersant coated pigments are dispersed;(iii) incorporating the additive system within at least a portion of the melt flow of polymeric host material upstream of the spinneret orifices to form a mixture of the polymeric host material and the additive system, and allowing said dispersant-coated pigment particles to break apart into average particle sizes of about 1 .mu.m or less in the mixture; and then (iv) extruding a melt of the mixture through the spinneret orifices to form pigmented filaments.