Coatings for coils

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C - Chemistry, Metallurgy

09

D

C09D 175/08 (2006.01) C08G 18/50 (2006.01) C08G 65/00 (2006.01) C09D 171/02 (2006.01)

Patent

CA 2207516

Use of crosslinked polymers for coil coating based on perfluoropolyethereal polymers, comprising as repeating units sequences of one or more oxyfluoroalkylenic units such as -CF2CF2O-, -CR4R5CF2CF2O- wherein R4 and R5 equal to or different from each other are chosen among H, Cl, F or perfluoroalkyl from 1 to 4 carbon atoms, -CF2CF(CF3)O-, -CFYO-, wherein Y is equal to F or CF3, having hydroxylic bifunctional termination, crosslinking being carried out with blocked polyisocyanates having at least 3 NCO groups.

La présente invention porte sur l'utilisation de polymères réticulés, destinés à l'enduction en continu de bandes, à base de polymères de perfluoropolyéther, comprenant comme unités récurrentes un ou plusieurs motifs oxyfluoroakyléniques tels que -CF2CF2O-, -CR4R5CF2CF2O-, dans lequel R4 et R5 sont identiques ou différents et sont choisis parmi H, Cl, F ou un perfluoroalkyle contenant de 1 à 4 atomes de carbone, -CF2CF(CF3)O-, -CFYO-, dans lequel Y est un F ou un CF3, à terminaison bifonctionnelle hydroxylique, la réticulation étant réalisée à l'aide de polyisocyanates bloqués possédant au moins 3 groupes NCO.

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