Self-precipitating aqueous particulate composition...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/08 (2006.01) C09C 3/10 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2745942

The present invention relates to an acidic, aqueous, particulate composition having a high stability with respect to agglomeration for autophoretic deposition of organic-inorganic hybrid layers on metal surfaces, containing, in addition to iron(III) ions, fluoride ions and at least one dispersed organic binder (B), pigment- binder particles comprising a pigment portion and a binder portion (B), such that the binder (B) contains a polymer of at least one monomer having acid groups and at least one polymerizable double bond. Likewise, the invention relates to the use of an aqueous dispersion containing pigment-binder particles comprising a pigment portion and a binder portion (B) for the production of a self-depositing composition as well as a method for autophoretic deposition on metal surfaces.

La présente invention concerne une composition particulaire aqueuse acide qui présente une grande stabilité par rapport à une agglomération pour le dépôt par autophorèse de couches hybrides organiques-inorganiques sur des surfaces métalliques, laquelle composition comprend, outre des ions fer (III), des ions fluorure et au moins un liant organique dispersé (B), des particules de pigment-liant composées d'une partie pigment et d'une partie liant (B). Le liant (B) contient un polymère d'au moins un monomère qui porte des groupes acide et qui présente une double liaison polymérisable. L'invention concerne également l'utilisation d'une dispersion aqueuse contenant des particules de pigment-liant composées d'une partie pigment et d'une partie liant (B) pour produire une composition auto-déposante, ainsi qu'un procédé de dépôt par autophorèse sur des surfaces métalliques.

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