Use of aqueous hybrid binders and alkyd systems for coating agents

摘要

The present invention relates to aqueous hybrid binders comprising an aqueous polymer dispersion (PD), and also 0.01%-5% by weight of a photoinitiator, and also to aqueous alkyd systems comprising a water-soluble alkyd resin or an aqueous alkyd or polyurethane emulsion or dispersion, and also 0.01%-5% by weight of a photoinitiator, and to the use thereof in coating compositions, more particularly in coating materials.

主权项

1. An aqueous hybrid binder, comprising:
(A) from 0.01%-5% by weight of a photoinitiator, based on 100% of the binder; and (B) an aqueous polymer dispersion (PD) comprising a polymer (P) and an alkyd-containing component, wherein: the polymer (P) comprises, in polymerized form, an α,β-ethylenically unsaturated monomer (M), and optionally a further monomer (M1): the alkyd containing component is (a) a water-soluble alkyd resin having a weight-average molecular weight of between 5000 and 40 000 Da, (b) an aqueous alkyd emulsion or dispersion, or (c) a polyurethane-alkyd emulsion or dispersion; and the aqueous polymer dispersion is obtained by a process comprising
performing free-radical emulsion polymerization of the α,β-ethylenically unsaturated monomer (M), and optionally the further monomer (M1), to obtain the polymer (P),optionally performing a subsequent chemical deodorization, andadding the water-soluble alkyd resin having a weight-average molecular weight of between 5000 and 40 000 Da, or adding the aqueous alkyd emulsion or dispersion, or adding the polyurethane-alkyd emulsion or dispersion, wherein the addition of the alkyd resin, the alkyd emulsion or dispersion, or the polyurethane-alkyd emulsion or dispersion takes place alternatively (i) directly subsequent to the polymerization of M and M1, and optionally the chemical deodorization, at room temperature, (ii) subsequent to the polymerization of M and M1, with an after stir time of 0-2 h, or (iii) subsequent to the chemical deodorization, with an after stir time of 0-2 h, wherein a temperature of addition according to (ii) or (iii) is from 60 to 99° C.