Claims
- 1. 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.
- 2. The process of claim 1 wherein said thermoplastic polymer is selected from the group consisting of nylon, polyester, polypropylene and copolymers and blends thereof.
- 3. The process of claim 2 wherein said nylon polymer is selected from the group consisting of nylon 66, nylon 6 and copolymers and blends thereof.
- 4. The process of claim 1 wherein said melt processable polymeric matrix consists essentially of at least one melt processable polymer selected from the group consisting of nylon, polyester, polypropylene and copolymers and blends thereof.
- 5. The process of claim 4 wherein said nylon polymer is selected from the group consisting of nylon 66, nylon 6 and copolymers and blends thereof.
- 6. The process of any one of claims 1-5 wherein said extruded article is a molded part.
- 7. The process of any one of claims 1-5 wherein said extruded article is fiber.
- 8. The process of claim 7 wherein the mean color difference along a fiber package, as measured by mean delta E CMC(2:1), is about 0.3 or less.
Parent Case Info
This is a continuation of application Ser. No. 08/629,863, filed Apr. 9, 1996, now abandoned, which claims the benefit of provisional application Ser. No. 60/004,405, filed Sep. 28, 1995.
US Referenced Citations (7)
Foreign Referenced Citations (3)
Number |
Date |
Country |
646 409 |
Apr 1995 |
EPX |
3523661 |
Jan 1987 |
DEX |
1119199 |
Jul 1968 |
GBX |
Non-Patent Literature Citations (2)
Entry |
AATCC Committee, CMC: Calculation of Small Color Differences for Acceptability, AATCC Technical Manual, pp. 321-324, 1991. |
Roderick McDonald, Acceptability and Perceptibility Decisions Using the CMC Color Difference Formula, Quality Control, vol. 20, No. 6, pp. 31-37, Jun. 1988. |
Continuations (1)
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Number |
Date |
Country |
Parent |
629863 |
Apr 1996 |
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