| (19) |
 |
|
(11) |
EP 0 936 288 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.06.2000 Bulletin 2000/23 |
| (43) |
Date of publication A2: |
|
18.08.1999 Bulletin 1999/33 |
| (22) |
Date of filing: 31.12.1998 |
|
| (51) |
International Patent Classification (IPC)7: C25D 11/22 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
07.01.1998 US 4035
|
| (71) |
Applicant: Clariant Finance (BVI) Limited |
|
Road Town, Tortola (VG) |
|
| (72) |
Inventor: |
|
- Jozefowicz, Mark
Matthews, North Carolina 28105 (US)
|
| (74) |
Representative: D'haemer, Jan Constant et al |
|
Clariant International Ltd., Rothausstrasse 61
4132 Muttenz 1
4132 Muttenz 1 (CH) |
|
| |
|
| (54) |
A process for producing colour variations on electrolytically pigmented anodized aluminium |
(57) A process for producing a coloured article of anodized aluminium or aluminium alloy,
wherein an anodized aluminium or aluminium alloy article (A), which is electrolytically
pigmented with a metallic pigment (B) within the anodically produced oxide layer,
is treated with a solution (C) comprising metal cations of a species other than that
of said metallic pigment (B), until a perceivable colour conversion has taken place,
and sealed.