Levelling agent for surface paint

Abstract

The invention relates to levelling agents for surface coatings having a weight-average molecular weight of from 5000 to 100,000. The levelling agent is a branched polymer comprising a free-radically or ionically polymerized base molecule into which macromonomeric units containing at one end a monomeric unit which has an ethylenically unsaturated bond and possessing a weight-average molecular weight of from 1000 to 30,000 have been incorporated by free-radical or ionic copolymerization, the weight fraction of the macromonomeric units, based on the total weight of the branched polymer, being from 1 to 60% by weight. The invention further relates to the use of appropriate polymers as levelling agents for coating formulations and to coating formulations comprising the levelling agents of the invention.

Description

technical field

[0001] The invention relates to a leveling agent for surface coatings, the weight-average molecular weight of which is 5,000-100,000, which is suitable for providing a uniform surface for coating compositions such as paints. The present invention also relates to the use of the leveling agent of the present invention in a coating composition and the coating composition containing the leveling agent of the present invention. Background technique

[0002] Painted surfaces are usually not perfectly smooth, but instead always have a structured surface to varying degrees, which is called a corrugated or orange-peel surface. These surfaces may be finely structured with short, small corrugations, or coarsely, with long corrugations. In most cases, such moiré is undesirable. This structure depends on the nature and composition of the coating compositions; for example, in the case of powder coatings, on whether these coating compositions contain solvents or are solve...