Coating of un-primed metals with polyamide powder coating...

B - Operations – Transporting – 05 – D

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B05D 7/14 (2006.01) C08G 69/04 (2006.01) C08G 69/26 (2006.01) C09D 5/03 (2006.01) C09D 177/00 (2006.01) C09D 177/06 (2006.01)

Patent

CA 2239900

A powder coating method for un-primed aluminium and steel surfaces. The method utilizes a polyamide having at least some adjacent amide linkages along the polymer backbone having at least one pendant alkyl branch of 1-3 carbon atoms and at least some adjacent amide linkages along the polymer backbone having sequences of at least seven consecutive carbon atoms, said polyamide having a relative viscosity in formic acid measured at 25 ~C using 8.4 % polymer of at least 20 and a melting point in the range of 140-200 ~C. The method permits a lower temperature than other polyamides.

L'invention concerne un procédé d'application d'un revêtement sur des surfaces d'aluminium ou d'acier n'ayant pas subi de traitement préalable. Le procédé fait appel à un polyamide ayant au moins quelques liaisons amide adjacentes le long de l'ossature du polymère ayant au moins un groupe alkyle pendant de 1-3 atomes de carbone et au moins quelques liaisons amide adjacentes le long de l'ossature du polymère ayant des séquences d'au moins sept atomes de carbone consécutifs, ce polyamide ayant une viscosité d'au moins 20 dans l'acide formique mésurée à 25 ·C, en utilisant une solution à 8,4 % de polymère, et un point de fusion dans la plage de 140 - 200 ·C. Le procédé permet d'utiliser une température plus basse que les autres polyamides.

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