(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

(21) Application number: 24153582.2

(22) Date of filing: 25.04.2017
(51) International Patent Classification (IPC): 
C23C 22/12(2006.01)
C23C 22/78(2006.01)
(52) Cooperative Patent Classification (CPC):
C23C 22/12; C23C 22/78
(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 D90 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.





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