| (19) |
 |
|
(11) |
EP 0 295 672 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
21.03.1990 Bulletin 1990/12 |
| (43) |
Date of publication A2: |
|
21.12.1988 Bulletin 1988/51 |
| (22) |
Date of filing: 16.06.1988 |
|
|
| (84) |
Designated Contracting States: |
|
DE ES FR GB NL |
| (30) |
Priority: |
18.06.1987 US 63455
|
| (71) |
Applicant: E.I. DU PONT DE NEMOURS AND COMPANY |
|
Wilmington
Delaware 19898 (US) |
|
| (72) |
Inventor: |
|
- Lee, Kiu-Seung
Richmond
Virginia 23234 (US)
|
| (74) |
Representative: Abitz, Walter, Dr.-Ing. et al |
|
Patentanwälte Abitz & Partner
Postfach 86 01 09
81628 München
81628 München (DE) |
|
| |
|
| (54) |
Colored aramid fibers |
(57) Colored, high strength, high modulus p-aramid fibers are prepared by including an
organic pigment which is soluble in but not degraded by concentrated sulfuric acid
in a p-aramid spinning dope wherein the solvent is concentrated sulfuric acid and
spinning the pigment containing dope through an air gap into a coagulation bath and
washing and drying the resulting fibers. No colorant particles or agglomerates are
visible under an electron microscope at a magnification of 9000 X.