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US 6,149,850 AGranted
Addition of additives to polymeric materials
AssigneeBASF SE
InventorOliver Keith Gannon
Life of this patent
Estimating the term…
Abstract
A process for introducing additives into a polymer melt comprising dispersing at least one additive in an at least partially volatile liquid vehicle with a dispersant and a stabilizer for the dispersion; feeding the resulting dispersion to a vented extruder which is extruding a polymer; and removing the fed volatiles through the extruder vent to achieve a substantially homogeneous system containing the polymer and at least one additive is disclosed.
Claims13
A process for introducing additives into a thermoplastic polyamide melt comprising:
- a) dispersing at least one pigment or nonpigment colorant or mixture thereof in an at least partially aqueous volatile liquid vehicle with a water dispersible/soluble polymeric dispersant and a stabilizer for the resulting aqueous dispersion wherein the dispersion contains between about 0.075% and about 7.5% dispersant by total dispersion weight and between about 0.75% and about 7.5% of stabilizer by total dispersion weight;
- b) feeding the resulting aqueous dispersion to a vented extruder which is extruding a polymer;
- c) removing the fed volatiles through the extruder vent to achieve a substantially homogenous system containing the polyamide and at least one pigment or nonpigment colorant or mixture thereof;
- and
- d) extruding the substantially homogenous system through a spin pack to form fiber, wherein the Pressure Index in the spin pack does not exceed about 10.
2 more elements
A process for preparing colored thermoplastics polyamides comprising:
- a) preparing in an at least partially aqueous volatile vehicle a dispersion of a pigment or nonpigment colorant or mixture thereof, a water dispersible/soluble polymeric dispersant and a stabilizer of said dispersion wherein the dispersion contains between about 0.075% and about 7.5% dispersant by total dispersion weight and between about 0.75% and about 7.5% of stabilizer by total dispersion weight;
- b) adding the prepared aqueous dispersion to a twin screw vented extruder which is extruding a molten thermoplastic polyamide;
- c) removing volatiles present in the thermoplastic polyamide from the addition of the dispersion;
- and
- d) extruding the thermoplastic polyamide through a spin pack to form fiber, wherein the Pressure Index in the spin pack does not exceed about 10.
2 more elements
Dependencies are inferred from the claim text.