초록 ▼

Crosslinking cationic paint binders, preferably cathodically depositable paint binders comprising (poly)-2-hydroxyalkylurea compounds as a crosslinking agent are described. The 2-hydroxyalkylureas are obtained by reacting organic polyisocyanates with secondary beta-hydroxyalkylamines. The crosslinki

Crosslinking cationic paint binders, preferably cathodically depositable paint binders comprising (poly)-2-hydroxyalkylurea compounds as a crosslinking agent are described. The 2-hydroxyalkylureas are obtained by reacting organic polyisocyanates with secondary beta-hydroxyalkylamines. The crosslinking agents of the invention permit film formation in the stoving range of about 140°C., which is particularly favorable for water-based paints. Additionally, selective semi-blocking which is made possible through the difference in reactively between the NCO-groups of individual polyisocyanates is enhanced through use of the secondary amino groups, in comparison to through use of hydroxyl groups which are conventionally used.

대표청구항 ▼

Cationic paint binders comprising in combination a (poly)-2-hydroxyalkylurea crosslinking agent which is the reaction product of an organic polyisocyanate blocked with a secondary beta-hydroxyalkylamine and having reactive -NCO functional groups at temperatures of as low as 140°C., and a paint binde

Cationic paint binders comprising in combination a (poly)-2-hydroxyalkylurea crosslinking agent which is the reaction product of an organic polyisocyanate blocked with a secondary beta-hydroxyalkylamine and having reactive -NCO functional groups at temperatures of as low as 140°C., and a paint binder carrying nitrogen-basic groups and having functional groups reactive at said temperatures with said -NCO functional groups.