Carboxylate-containing polymers for metal surface treatment
AssigneeBASF Aktiengesellschaft co-pendency.
InventorsFrank Dietsche, Helmut Witteler, Matthias Kluglein, Frank Klippel
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Abstract
The present invention relates to a composition for treating surfaces, comprising a copolymer as component A, synthesized from (meth)acrylic acid or salts thereof, a carboxylate-containing monomer and/or monomers containing groups containing phosphoric and/or phosphonic acid or salts thereof, and further comonomers if desired, to a passivating layer on a metal surface, which comprises component A, to a process for forming said passivating layer, and to the use of the composition of the invention to passivate a metal surface.
Claims28
1-13. (canceled)
A Cr (VI) free composition for treating metal surfaces having a pH value of 1 to 6, comprising
- a) at least one copolymer as component A, synthesized from
- aa) 50 to 99.9% by weight of (meth)acrylic acid or salts thereof as component Aa;
- and
- ab) 01 to 50% by weight of monomers containing groups containing phosphoric and/or phosphoric acid or salts thereof, as component Ab2, and polymerizable with the monomers specified under aa) and ac);
- ac) 0 to 30% by weight of further comonomers polymerizable with the monomers specified under aa) and ab), as component Ac;
- b) water or a mixture of water and another, water miscible solvent, the fraction of water in such a mixture is at least 75% by weight, which is capable of dissolving, dispersing, suspending or emulsifying the polymer (component A), as component B;
- c) at least one acid or one alkali metal or alkaline earth metal salt of said acid selected from the group consisting of phosphoric acid, sulfuric acid, sulfonic acids, formic acid, acetic acid, nitric acid, hydrofluoric acid, and hydrochloric acid, as component F.
Dependencies are inferred from the claim text.