Powdered thermosetting composition for coatings

Details Powdered thermosetting composition for coatings Powdered thermosetting composition for coatings

C - Chemistry, Metallurgy

09

D

C09D 167/02 (2006.01)

Patent

CA 2400576

The present invention relates to powdered thermosetting compositions including a binder which comprises a carboxyl group containing amorphous isophthalic acid containing polyester, a carboxyl group containing aliphatic semi- crystalline polyester, an optional and different carboxyl group containing semi-crystalline polyester, at least 5 parts by weight, based on the total weight of the binder, of a specific glycidyl group containing acrylic copolymer and a curing agent having functional groups reactive with the polyesters' carboxyl groups. The powdered thermosetting compositions are useful for the preparation of powdered paints and varnishes which give semi- matt coatings having an outstanding flow, a remarkable weatherability and excellent mechanical properties.

La présente invention concerne des compositions thermodurcissables en poudre comprenant un liant qui contient : un groupe carboxyle contenant un acide isophtalique amorphe contenant un polyester ; un groupe carboxyle contenant un polyester semi-cristallin aliphatique ; éventuellement un groupe carboxyle différent contenant un polyester semi-cristallin ; et au moins 5 parties en poids, selon le poids total du liant, d'un groupe glycidylique spécifique contenant un copolymère acrylique et un durcisseur présentant des groupes fonctionnels qui réagissent avec les groupes carboxyles des polyesters. Ces compositions thermodurcissables en poudre sont utiles pour la préparation de peintures et de vernis en poudre, qui permettent d'obtenir des revêtements semi-mats présentant une fluidité exceptionnelle, une remarquable tenue aux intempéries et d'excellentes propriétés mécaniques.

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