Abstract:
Solventborne filler comprises at least one alpha,omega-hydroxy-functionalized oligoester which possesses an OH number of 30 to 160 mg KOH/g, a theoretical carbon-carbon double bond content of 1 to 3 mmol/g, a number-average molecular weight of 1000 to 3000 g/mol and a weight-average molecular weight of 2800 to 10 000 g/mol, moreover, the sum of the weight percentage fractions of all the alpha,omega-hydroxy-functionalized oligoesters being 0.5 to 10 wt. %, based on the total amount of the solventborne filler. Also provided are a multicoat paint system, a process for producing a multicoat paint system, and use of the above-designated alpha,omega-hydroxy-functionalized oligoester in solventborne fillers for improving adhesion.
Abstract:
The present invention relates to a copolymer obtainable by copolymerization of at least three ethylenically unsaturated monomers each different from one another, the copolymer having at least three structural units (S1) and (S2) and (S3) different from one another, to the use of this copolymer as an adhesion-promoting additive in an aqueous coating composition, to an aqueous coating composition comprising at least one polymeric resin (A1), at least one pigment (B), and at least one copolymer of the invention, used as adhesion-promoting additive, as component (C), and also to methods for at least partly coating a substrate with a basecoat and for at least partly coating a substrate with a multicoat paint system.