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US 5,756,020 AGranted
Method for producing solution dyed articles from thermoplastic polymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsJohn S. Locke, Paul Sheldon Pearlman, Caroline Tjhen Shibata, Kenneth J. Tadler
Life of this patent
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Abstract
A process for producing solution dyed extruded articles from thermoplastic polymer wherein each colorant is contained in a separate color concentrate and each concentrate is fed to an extruder through a separate gravimetric feeder where the concentrates are melt blended with the thermoplastic polymer prior to extruding.
Claims8
A method for making colored extruded articles of thermoplastic polymers comprising the steps of:
- a) feeding a thermoplastic polymer to an extruder;
- b) feeding at least two differently colored color concentrates to said extruder, each of said color concentrates fed from a separate gravimetric feeder, wherein each color concentrate consists essentially of from about 0.1 to about 70 weight percent of a single colored pigment or dye dispersed in from about 30 weight percent to about 99.9 weight percent of a melt processable polymeric matrix;
- c) melting said thermoplastic polymer and said color concentrates;
- d) mixing said melted thermoplastic polymer with said melted color concentrates to form an extrudable mixture;
- and
- e) extruding said mixture into an extruded article.
3 more elements
Dependencies are inferred from the claim text.