Patent · US Expired

Aqueous polyurethane-ureas, a process for their production and their use in coating compositions

US5804647A · kind A · utility

14Cited by

2References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Klaus Nachtkamp · Cologne, DE
Oswald Wilmes · Recklinghausen, DE
Eberhard Arning · Kaarst, DE
Rolf Roschu · Willich, DE

Key dates

Filing date	Feb 21, 1997
Grant date	Sep 8, 1998
Priority date	—
Expiry date	Feb 21, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09D175/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to aqueous polyurethane-urea dispersions which are film forming at temperatures of .ltoreq.20.degree. C. in the absence of film forming additives, dry at room temperature to yield films having a hardness according to DIN 53 157 (Konig pendulum hardness) of .gtoreq.100 seconds, in which the polyurethane-ureas have a urethane group content (calculated as --NH--CO--O--, molecular weight 59) of 7 to 20 wt. %, and a urea group content (calculated as -NH-CO-N, molecular weight 57) of 5 to 18 wt. %, and contain 15-70 wt. %, based on resin solids, of structural units prepared by incorporating 1-methyl-2,4- and/or -2,6-diisocyanatocyclohexane in the form of urethane and/or urea groups. The present invention also relates to a process for the production of these aqueous polyurethane-urea dispersions and to their use in coating compositions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.