REACTION PRODUCT CONTAINING DIMER FATTY ACID AND COATING AGENT CONTAINING THE REACTION PRODUCT

摘要

The invention relates to a reaction product which can be produced by reaction of (a) dimer fatty acids having (b) at least one compound (b) of the general structural formula (I) wherein R represents a C3- to C6-alkylene radical and n is accordingly selected such that the connection (b) has a number average molecular weight of 120 to 445 g/mol , the components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.6/1.7 and the resulting reaction product has a number average molecular weight of 600 to 4000 g/mol and an acid number of less than 10 mg KOH/g. The invention further relates to a pigmented aqueous base coat which contains said reaction product and to the use of the reaction product in pigmented aqueous base coats for improving adhesion. The invention further relates to a method for producing multi-layer coatings and to the multi-layer coatings which can be produced with the aid of said method.