| (19) |
 |
|
(11) |
EP 0 404 145 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
25.09.1991 Bulletin 1991/39 |
| (43) |
Date of publication A2: |
|
27.12.1990 Bulletin 1990/52 |
| (22) |
Date of filing: 21.06.1990 |
|
| (51) |
International Patent Classification (IPC)5: D01F 6/60 |
|
| (84) |
Designated Contracting States: |
|
NL |
| (30) |
Priority: |
21.06.1989 US 369107
|
| (71) |
Applicant: E.I. DU PONT DE NEMOURS AND COMPANY |
|
Wilmington
Delaware 19898 (US) |
|
| (72) |
Inventor: |
|
- Uy, William Cheng
Newark,
Delaware 19713 (US)
|
| (74) |
Representative: Abitz, Walter, Dr.-Ing. et al |
|
Patentanwälte Abitz & Partner
Postfach 86 01 09
81628 München
81628 München (DE) |
|
| |
|
| (54) |
Mixed solvent for aramid spinning dopes |
(57) A room temperature anisotropic spinning solution and associated spinning process
are disclosed for poly(p-phenylene terephthalamide) using a solvent mixture of chlorosulfuric
acid and sulfuric acid of at least 100% concentration.