| (19) |
 |
|
(11) |
EP 0 439 989 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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04.03.1992 Bulletin 1992/10 |
| (43) |
Date of publication A2: |
|
07.08.1991 Bulletin 1991/32 |
| (22) |
Date of filing: 07.12.1990 |
|
| (51) |
International Patent Classification (IPC)5: B05D 7/16 |
|
| (84) |
Designated Contracting States: |
|
BE DE ES FR IT NL |
| (30) |
Priority: |
20.12.1989 GB 8928757
|
| (71) |
Applicant: PROCOAT, S.A. |
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E-08191 Rubi (Barcelona) (ES) |
|
| (72) |
Inventors: |
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- Brugarolas, Juan
E-08190 Sant Cugat Del Valles (ES)
- Rodellas, Federico
E-08190 Sant Cugat Del Valles (ES)
|
| (74) |
Representative: Alonso Langle, Emilio |
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C. Explanada, 8
28040 Madrid
28040 Madrid (ES) |
|
| |
|
| (54) |
Chromate-organic pre-treated steel for high corrosion resistance and improved paintability |
(57) A process of applying additional coatings to zinc coated steel or zinc alloy coated
steel to improve at least the corrosion resistance and paintability of zinc or zinc
alloys coated steel, comprises:
Applying to the zinc or zinc alloy coated steel a first composition comprising an
aqueous emulsion of an organic acrylic polymer in a chromic acid solution to form
a first additional coating; and
Subsequently applying to the steel a second composition, being an aqueous composition
comprising a polyurethane polymer, one or more crosslinking agents and one or more
silicates, to form a second additional coating.