C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 167/02 (2006.01) C09D 5/44 (2006.01) C25D 13/06 (2006.01)
Patent
CA 2403021
The present invention is directed to an electrodepositable composition of a resinous phase dispersed in an aqueous medium. The resinous phase includes an ionic polyester polymer prepared from a) an aromatic and/or cycloaliphatic carboxylic acid compound having at least two aromatic and/or secondary aliphatic carboxyl groups, b) a branched aliphatic, cycloaliphatic or araliphatic compound containing at least two aliphatic hydroxyl groups, the aliphatic hydroxyl groups being either secondary or tertiary hydroxyl groups or primary hydroxyl groups attached to a carbon adjacent to a tertiary or quaternary carbon, c) a compound including an ionic salt group or a group which is converted to an ionic salt group, and d) optionally, at least one hydroxyl substituted carboxylic compound comprising at least one tertiary aliphatic carboxyl group and at least two aliphatic hydroxyl groups. The present invention also includes a method for electrocoating a conductive substrate with the described electrodepositable composition. Lastly, the present invention is directed to a conductive substrate coated according to the described method.
La présente invention concerne une composition d'électrodéposition constituée d'une phase résineuse dispersée dans un milieu aqueux. Ladite phase résineuse renferme un polymère polyester ionique préparé à partir a) d'un composé acide carboxylique aromatique et/ou cycloaliphatique comportant au moins deux groupes carboxyle aromatiques et/ou aliphatiques secondaires, b) d'un composé ramifié aliphatique, cycloaliphatique ou araliphatique comportant au moins deux groupes hydroxyle aliphatiques, lesdites groupes hydroxyle aliphatiques étant soit des groupes secondaires ou tertiaires soit des groupes hydroxyle primaires attachés à un carbone adjacent à un carbone tertiaire ou quaternaire, c) d'un composé comprenant un groupe de sels ioniques ou un groupe transformé en un groupe de sels ioniques, et d) éventuellement, au moins un composé carboxylique hydroxyl-substitué comprenant au moins un groupe carboxyle aliphatique tertiaire et au moins deux groupes hydroxyle aliphatiques. La présente invention concerne également un procédé d'électrodéposition pour substrat conducteur faisant intervenir ladite composition d'électrodéposition. Enfin, la présente invention porte sur un substrat conducteur revêtu conformément au procédé de l'invention.
Anderson Linda K.
Eswarakrishnan Venkatachalam
Kollah Raphael O.
Mccollum Gregory J.
Peffer Robin M.
Borden Ladner Gervais Llp
Ppg Industries Ohio Inc.
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