There is described an acrylic polyester resin, obtainable by grafting an acrylic polymer with a polyester material. The polyester material is obtainable by polymerizing (i) a polyacid component, with (ii) a polyol component, including2,2,4,4-tetraalkylcyclobutane-1,3-diol. One of the polyacid component or the polyol component comprises a functional monomer operable to impart functionality on to the polyester resin, such that an acrylic polymer may be grafted with the polyester material via the use of said functionality. Also provided is an aqueous coating composition comprising the acrylic polyester resin and a metal packaging containing coated with the composition.

The aim of the invention is to provide polyester/primer/metallic coating composite films having good adherence of the metallic coating in dry and humid conditions. Said films also form a good gas barrier: oxygen permeability less than or equal to 0.8 cc/m2/d; water vapour permeability less than or equal to 0.3 g/m2/d. To this end, the invention concerns a composite film comprising a polyester substrate, at least one coating adhering on at least one of the faces of the substrate and at least one layer of primer for cross-linked adhesion between the substrate and the coating. Said primer comprises at least one acrylic and/or methacrylic polymer P1, at least one acrylic and/or methacrylic polymer P2 different from P1, at least one cross-linking agent, and, preferably, at least one polyester that is soluble or dispersible in water: P1 having a gel content TG1>70% by dry weight with respect to P1; P2 having a gel content TG2TG1 and 20% by dry weight, with respect to P2; P1 having a surface-grafted free weak acid content >0.8 in meq/g of polymer; [P2]60% by weight on dry by weight in respect to P1+P2. The method for producing said film, the adhering primer, and the articles obtained using said film, also form part of the present invention.

The present invention relates to a process for applying a topcoat to at least one side of a substrate, comprising a step (a) of at least partly coating at least one substrate metal surface, at least partly coated with at least one primer coat, with an aqueous coating composition which comprises at least one polymer dissolved or dispersed therein, the coating composition further comprising at least one mixed hydroxide of the general formula (I), and the process being a coil coating process; to a topcoat applied to at least one side of the substrate and obtainable by this process; to a substrate at least partly coated on at least one side with a topcoat by this process; and also to a use of this coating composition for at least partly coating at least one substrate metal surface, at least partly coated with at least one primer coat, with a topcoat in a coil coating process.

The present invention relates to a process for applying a topcoat to at least one side of a substrate, comprising a step (a) of at least partly coating at least one substrate metal surface, at least partly coated with at least one primer coat, with an aqueous coating composition which comprises at least one polymer dissolved or dispersed therein, the coating composition further comprising at least one mixed hydroxide of the general formula (I), and the process being a coil coating process; to a topcoat applied to at least one side of the substrate and obtainable by this process; to a substrate at least partly coated on at least one side with a topcoat by this process; and also to a use of this coating composition for at least partly coating at least one substrate metal surface, at least partly coated with at least one primer coat, with a topcoat in a coil coating process.

This invention relates to products H made by reaction of a cyclic alkyleneurea U, at least one multifunctional aldehyde A2, and at least one of (a) an aminoplast former M that is not the same as the cyclic alkyleneurea U, and (b) a monofunctional aldehyde A1, which product H is optionally etherified by reaction of at least a part of the hydroxyl groups formed by addition reaction of NH groups and aldehyde groups, with an alcohol having from one to ten carbon atoms, and wherein glyoxal is present in the at least one multifunctional aldehyde A2, to processes for their preparation, and to a method of use thereof in coating compositions.

This invention relates to products H made by reaction of a cyclic alkyleneurea U, at least one multifunctional aldehyde A2, and at least one of (a) an aminoplast former M that is not the same as the cyclic alkyleneurea U, and (b) a monofunctional aldehyde A1, which product H is optionally etherified by reaction of at least a part of the hydroxyl groups formed by addition reaction of NH groups and aldehyde groups, with an alcohol having from one to ten carbon atoms, and wherein glyoxal is present in the at least one multifunctional aldehyde A2, to processes for their preparation, and to a method of use thereof in coating compositions.

This invention relates to products H made by reaction of a cyclic alkyleneurea U, at least one multifunctional aldehyde A2, and at least one of (a) an aminoplast former M that is not the same as the cyclic alkyleneurea U, and (b) a monofunctional aldehyde A1, which product H is optionally etherified by reaction of at least a part of the hydroxyl groups formed by addition reaction of NH groups and aldehyde groups, with an alcohol having from one to ten carbon atoms, and wherein glyoxal is present in the at least one multifunctional aldehyde A2, to processes for their preparation, and to a method of use thereof in coating compositions.