| abstract |
The invention relates to a pigmented aqueous base coat containing at least one alpha,omega-hydroxyl-functionalised oligoester with a hydroxyl number of 25 to 95 mg KOH/g, a theoretical carbon-carbon double bond content of 0.5 to 2.5 mmol/g, a number-average molecular weight of 2500 to 6000 g/mol and a weight-average molecular weight of 15000 to 30000 g/mol, said alpha,omega-hydroxyl-functionalised oligoester also containing at least one partially or wholly salted acid group, and wherein the sum of the weight-percentages of all the alpha,omega-hydroxyl-functionalised oligoesters is 0.5 to 10 wt.% based on the total amount of solids in the pigmented aqueous base coat. The invention further relates to a multilayer coating and to a process for producing a multilayer coating. The invention also relates to the use of the above-designated alpha,omega-hydroxyl-functionalised oligoester in pigmented aqueous base coats to improve adhesion. |