Abstract: This invention relates to a composition, and to the preparation and use of thereof said composition being suitable as a rheology influencer for coating media and comprising the reaction product formed by reaction of a mixture of components A, B and C with components D, E and F. Components A, B and C form a mixture wherein component A is one or more (meth)acrylic copolymers and/or one or more polyesters which contain hydroxyl groups. Component B is a copolymer of ethylhexyl (meth)acrylate and one or more hydroxyalkyl (meth)acrylates, as well as .alpha.,.beta.-unsaturated monomers which are different therefrom. Component C is a hydroxy--functional microdispersion which is produced by polymerizing hydroxylalkyl (meth)acrylates in combination with unsaturated monomers in a mixture of polyesters or polyacrylates containing carboxyl and/or hydroxyl groups. Component D is one or more aliphatic polyisocyantes and component E is .epsilon.-caprolactam. The caprolactam partially blocks the polyisocyanate.