| (19) |
 |
|
(11) |
EP 1 106 710 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
09.07.2003 Bulletin 2003/28 |
| (43) |
Date of publication A2: |
|
13.06.2001 Bulletin 2001/24 |
| (22) |
Date of filing: 06.12.2000 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
09.12.1999 JP 35055499
|
| (71) |
Applicant: Nippon Paint Co., Ltd. |
|
Osaka-shi, Osaka 531-0077 (JP) |
|
| (72) |
Inventors: |
|
- Yamasoe, Katsuyoshi
Sakura-shi, Chiba 285-0807 (JP)
- Saito, Kentaro
Kawasaki-shi, Kanagawa 213-0032 (JP)
|
| (74) |
Representative: Hubert, Philippe et al |
|
Cabinet Beau de Loménie 158, rue de l'Université
75340 Paris Cédex 07
75340 Paris Cédex 07 (FR) |
|
| |
|
| (54) |
Aluminium wheel surface conditioner, method of coating therewith, and unpigmented
aluminium wheel |
(57) This invention provides a surface conditioner for aluminum wheel comprising 0.01
to 10 mass % of a molybdic acid compound and 0.1 to 30 mass % of sulfuric acid and
having a pH of less than 1 and a mass ratio of said molybdic acid compound to sulfuric
acid within the range of 0.01 to 1 (former/latter), and further provides a coating
method of an aluminum wheel which comprises treating a degreased aluminum wheel with
the surface conditioner as mentioned above, washing the treated wheel with water,
chromating the same at a chromium coverage of 1 to 10 mg/m
2, washing the chromated wheel with water, drying the same and applying a clear coating.