| 摘要 |
<p>Use of a water-dispersible polymer as binder in an aqueous filler composition which may or may not comprise, in addition to other polymeric binders, crosslinking agents and the customary additives, wherein the water-dispersible polymer is a polyurethane resin which contains building blocks derived from (A) polyisocyanates, (B) polyols having an average molecular weight Mn of at least 400, (C) low-molecular polyols if desired and, (D) compounds containing at least two groups reactive toward isocyanate groups and at least one group capable of forming anions, and (E) compounds which are monofunctional or contain active hydrogen of variable reactivity, these building blocks being always positioned at the chain end fo the polyurethane resin, and optionally (F) compounds which are other than (B), (C), (D) and (E) and contain at least two groups reactive toward NCO groups. The crosslinked filler coatings obtainable therefrom are distinguished, inter alia, by improved stone-chip resistance at low temperatures and by good intercoat adhesion.</p> |
