(19) |
 |
|
(11) |
EP 4 353 867 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
|
10.07.2024 Bulletin 2024/28 |
(43) |
Date of publication A2: |
|
17.04.2024 Bulletin 2024/16 |
(22) |
Date of filing: 25.04.2017 |
|
(51) |
International Patent Classification (IPC):
|
|
(84) |
Designated Contracting States: |
|
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
(30) |
Priority: |
25.04.2016 US 201615137014
|
(62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
|
17722292.4 / 3449035 |
(71) |
Applicant: PPG Industries Ohio, Inc. |
|
Cleveland, OH 44111 (US) |
|
(72) |
Inventors: |
|
- McMillen, Mark W.
Cabot, Pennsylvania, 16023 (US)
- Lemon, Steven J.
Lower Burell, Pensylvania, 15068 (US)
- Votruba-Drzal, Peter
Pittsburgh, Pennsylvania, 15208 (US)
- Karabin, Richard F.
Ruffs Dale, Pennsylvania, 15679 (US)
|
(74) |
Representative: f & e patent |
|
Braunsberger Feld 29 51429 Bergisch Gladbach 51429 Bergisch Gladbach (DE) |
|
|
|
(54) |
SYSTEM FOR NICKEL-FREE ZINC PHOSPHATE PRETREATMENT |
(57) Disclosed is a substrate pretreatment system, comprising (a) an activating rinse
for treating at least a portion of a substrate comprising a dispersion of metal phosphate
particles having a D
90 particle size of no greater than 10 µm, wherein the metal phosphate comprises divalent
or trivalent metals or combinations thereof; and (b) a pretreatment composition for
treating at least a portion of the substrate treated with the activating rinse, comprising
zinc ions and phosphate ions, wherein the pretreatment composition is substantially
free of nickel. Methods of treating a substrate with the substrate pretreatment system
also are disclosed. Substrates treated with the substrate pretreatment system also
are disclosed.