POWDER COATING COMPOSITION COMPRISING A POLYESTER AND A CROSSLINKER WITH OXIRANE GROUPS PROVIDING IMPROVED CORROSION RESISTANCE TO A SUBSTRATE COATED THEREWITH

The invention relates to a carboxylic acid functional branched polyester for thermosetting powder coating composition, wherein said polyester is prepared from at least the following monomers: a difunctional aromatic acid, the difunctional aromatic acid being a combination of terephthalic acid (TPA),...

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Bibliographische Detailangaben
Hauptverfasser:	BUIJSSEN, PAULUS FRANCISCUS ANNA, HETTINGA, JOHANNES ALBERTUS, CUIJPERS, JUUL, SCHUTTE, MARCELLINUS HERMANUS JOHANNES
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INKS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	The invention relates to a carboxylic acid functional branched polyester for thermosetting powder coating composition, wherein said polyester is prepared from at least the following monomers: a difunctional aromatic acid, the difunctional aromatic acid being a combination of terephthalic acid (TPA), isophthalic acid (IPA), an at least trifunctional monomer and a difunctional alcohol, the difunctional alcohol being a combination of at least ethylene glycol (EG) and/or diethylene glycol (DEG) and neopentyl glycol (NPG), the molar ratio of TPA to IPA in the carboxylic acid functional branched polyester is at most 12.4, and the functionality of the carboxylic acid functional branched polyester is from 2.15 to 4.0, and the carboxylic acid functional branched polyester has an acid value of from 14 to 80 mg KOH/g resin, and the carboxylic acid functional branched polyester has a glass transition temperature of at least 40C. The powder coating compositions of the present invention derived upon curing of the thermosetting powder coating compositions which comprise the polyester according to the invention together with a crosslinker with oxirane groups and an epoxy cure catalyst present good corrosion resistance to steel substrates. Furthermore, said low cost and corrosion resistant powder coatings may present good reverse impact resistance (RIR) and /or good smoothnes. L'invention porte sur un polyester ramifié à fonctionnalité acide carboxylique pour une composition de revêtement en poudre thermodurcissable, ledit polyester étant préparé à partir d'au moins les monomères suivants : un acide aromatique bifonctionnel, l'acide aromatique bifonctionnel étant une association d'acide téréphtalique (TPA) et d'acide isophtalique (IPA), un monomère au moins trifonctionnel et un alcool bifonctionnel, l'alcool bifonctionnel étant une association d'au moins un alcool parmi l'éthylèneglycol (EG) et/ou le diéthylèneglycol (DEG) et de néopentylglycol (NPG), le rapport molaire du TPA à l'IPA dans le polyester ramifié à fonctionnalité acide carboxylique étant au maximum de 12,4 et la fonctionnalité du polyester ramifié à fonctionnalité acide carboxylique étant de 2,15 à 4,0 et le polyester ramifié à fonctionnalité acide carboxylique ayant un indice d'acidité de 14 à 80 mg de KOH/g de résine et le polyester ramifié à fonctionnalité acide carboxylique ayant une température de transition vitreuse d'au moins 40°C. Les compositions de revêtement en poudre de la présente invention issue