Aqueous coating compositions containing water dispersible polyurethane polyureas as binders and the coatings produced therefrom

• US 5,141,987 A
• Filed: 10/26/1990
• Issued: 08/25/1992
• Est. Priority Date: 11/04/1989
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Mosbach, Jurgen, Schmitz, Hans G., Nachtkamp, Klaus, Sickert, Armin, Noll, Klaus
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): NILAND, PATRICK DENNIS
• Application Number:
  US07/604,718
• Time in Patent Office: 669 Days
• Field of Search: 524/591, 524/839, 528/76, 528/79, 528/80
• US Class Current: 524/591
• CPC Class Codes: C08G 18/0804 Manufacture of polymers containing ionic or ionogenic groups
• CPC Class Codes: C08G 18/44 Polycarbonates
• CPC Class Codes: C08G 18/5042 containing ureum groups
• CPC Class Codes: C08G 18/7818 containing ureum or ureum derivative groups
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 175/04 Polyurethanes

Abstract

This invention relates to an aqueous coating composition containing aluminum pigments and a water dispersible polyurethane polyurea binder which contains

(i) at least 200 milliequivalents per 100 g of solids of chemically incorporated carbonate groups --O--CO--O-- and

(ii) a combined total of up to 320 milliequivalents per 100 g of solids of chemically incorporated urethane groups --NH--CO--O-- and chemically incorporated urea groups --NH--CO--NH--.

The invention further relates to coatings prepared from the aqueous coating composition.

Claims

1. An aqueous coating composition comprising an aluminum pigment and a water dispersible polyurethane polyurea binder which contains

(i) at least 200 milliequivalents of chemically incorporated carbonate groups, --O--CO--O--, per 100 g of solids and

(ii) a combined total of up to 320 milliequivalents, per 100 g of solids, of chemically incorporated urethane groups, --NH--CO--O--, and chemically incorporated urea groups, --NH--CO--NH--.

2. The aqueous coating composition of claim 1 wherein the binder additionally contains a positive amount of up to 40%, based on the total weight of the binder, of at least one other water dispersible polymer.

3. The aqueous coating composition of claim 1 wherein said water dispersible polyurethane polyurea binder contains a combined total of 200 to 320 milliequivalents, per 100 g of solids, of chemically incorporated urethane groups, --NH--CO--O--, and chemically incorporated urea groups, --NH--CO--NH--.

4. The aqueous coating composition of claim 2 wherein said water dispersible polyurethane polyurea binder contains a combined total of 200 to 320 milliequivalents, per 100 g of solids, of chemically incorporated urethane groups, --NH--CO--O--, and chemically incorporated urea groups, --NH--CO--NH--.

5. A coating prepared from the aqueous coating composition of claim 1.