Coating agent with high weathering resistance, method for its manufacture and application

摘要

Coating agent comprises a pigment and/or a filler and a multi-stage polyvinylester dispersion obtained by (a) polymerization of a vinylester of a saturated carboxylic acid and optionally further monomers copolymerizable by it in the presence of at least one emulsifying agent and/or at least a protective colloid; (b) addition of at least a radical polymerizable monomer different from the vinylester used in step (a) to the polymerization mixture; and (c) addition of at least one initiator of the radical polymerization. Coating agent comprises a pigment and/or filler and a multi-stage polyvinylester dispersion obtained by (a) polymerization of a vinylester of a saturated carboxylic acid and optionally further monomers copolymerizable by it in the presence of at least one emulsifying agent and/or at least a protective colloid up to a conversion of at least 90% of used monomers; (b) addition of at least a radical polymerizable monomer different from the vinylester used in step (a) in pure form, in form of a solution or in form of an emulsion to the polymerization mixture; and (c) addition of at least one initiator of the radical polymerization after the completion of the addition of monomers in step (b), so that the added monomers in step (b) are polymerized in the presence of the dispersion produced in step (a). An independent claim is included for the polyvinylester dispersion, where the concentration of polymeric acids and/or the acid anhydride in the multi-stage polyvinylester dispersion does not exceed 6 wt.%, related to the total monomer quantity.