US 12,203,172 B2 · Aqueous dispersion for activating a metal surface and method for the phosphating thereof

Abstract

The present invention relates to an aqueous dispersion as a concentrate for the activation stage of phosphating of metal surfaces, containing a dispersed particulate constituent and a thickener, the particulate constituent containing, in addition to dispersed inorganic compounds of polyvalent metal cations, polymeric organic compounds as dispersing agents which are composed at least partially of styrene and/or an α-olefin having no more than 5 carbon atoms and maleic acid, its anhydride and/or its imide, and which additionally comprise polyoxyalkylene units. The aqueous dispersion is further characterized by a D50 value above 10 μm. The present invention also relates to a method for anti-corrosion pretreatment of the surfaces of a metal material, in particular for zinc phosphating.

Claims16

Dependent claims

An aqueous dispersion having a D50 value of more than 10 μm, containing:

(a) at least 5 wt. % of a dispersed particulate constituent comprising
(a1) at least one particulate inorganic compound of a polyvalent metal cation;
and
(a2) at least one polymeric organic compound composed at least partially of styrene, an α-olefin having no more than 5 carbon atoms or a combination thereof;
said at least one polymeric organic compound also comprising maleic acid, its anhydride, its imide or combinations thereof;
and which—additionally comprises polyoxyalkylene units;
and
(b) at least one thickener.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/106,337Filed 30 Nov 2020 · continuation

Priority

EP 1817699111 Jun 2018

Published

US 2021/0087693 A125 Mar 2021

Granted

21 Jan 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C23C 22/12
Orthophosphates: containing zinc cations
C23C 22/362
Containing also phosphates: containing also zinc cations
C23C 22/78
Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material…:…
C23F 11/10
In other liquids: using organic inhibitors

Aqueous dispersion for activating a metal surface and method for the phosphating thereof

Life of this patent

Aqueous dispersion for activating a metal surface and method for the phosphating thereof

Life of this patent

Abstract

Claims16