Thermal curable polyester powder coating composition

Details Thermal curable polyester powder coating composition Thermal curable polyester powder coating composition

C - Chemistry, Metallurgy

09

D

C09D 167/00 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2707634

The invention provides a powder coating composition comprising (A) at least one hydroxyl functional polyester resin binder, and (B) at least one polyurethane resin as cross-linking agent containing blocked isocyanate groups, wherein the at least one hydroxyl functional polyester resin binder (A) and the at least one polyurethane resin (B) both having a melting temperature of 60 to 180'C, in particular, 60 to 160'C. The powder coating composition according to the invention provides the desired technological properties, in particular, thin films and high flexibility in combination with excellent mechanical properties of the coatings.

L'invention concerne une composition de revêtement en poudre comprenant (A) au moins un liant en résine de polyester à fonction hydroxyle et (B) au moins une résine de polyuréthane comme agent de réticulation contenant des groupes isocyanates bloqués, aussi bien ledit ou lesdits liants en résine de polyester à fonction hydroxyle (A) que ladite ou lesdites résines de polyuréthane (B) ayant une température de fusion de 60 à 180 °C, en particulier de 60 à 160 °C. La composition de revêtement en poudre selon l'invention offre les propriétés technologiques souhaitées, en particulier de formation de films minces et de flexibilité élevée, en association avec d'excellentes propriétés mécaniques des revêtements.

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