Wäßrige PUR-Dispersionen mit verbesserten Eigenschaften

摘要

Aqueous polyurethane (PUR) dispersions consist of a polyisocyanate component (I) and a component (II) containing active hydrogen (H), comprising polymeric polyol(s) of molecular weight 400-600 and optionally low-molecular polyol(s) and/or polyamine(s) with molecular weight < 4000, in which at least one of the polyols or polyamines containing (potential) ionic groups. The novelty is that the durability is improved by using (I) containing NOTLESS 5 wt.% diisocyanate of formula (IA), where R = difunctional 4-18C (cyclo)aliphatic hydrocarbon group, obtained by removing both isocyanate (NCO) groups from a diisocyanate; and R' = 1-18 C monofunctional hydrocarbon group, optionally with oxygen atom(s) in the chain.