Use of polyurethane resins for aqueous filler compositions

US5047294A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Michael Schwab · Neuötting, DE
• Gerd Walz · Wiesbaden, DE

Key dates

• Filing date: Aug 18, 1989
• Grant date: Sep 10, 1991
• Expiry date: Aug 18, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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 PA1 (A) polyisocyanates, PA1 (B) polyols having an average molecular weight M.sub.n of at least 400, PA1 (C) low-molecular polyols if desired and, PA1 (D) compounds containing at least two groups reactive toward isocyanate groups and at least one group capable of forming anions, and PA1 (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 PA1 (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.