James Michael Mcintyre

US Patent:

6514572, Feb 4, 2003

Filed:

Apr 13, 2000

Appl. No.:

09/548915

Inventors:

William A. Koonce - Pearland TX
Debkumar Bhattacharjee - Lake Jackson TX
Michael Y. Gribble - Wollerau, CH
James A. McIntyre - Midland MI

Assignee:

Dow Global Technologies Inc. - Midland MI

International Classification:

B05D 104

US Classification:

427458, 4273722, 4273855

Abstract:

A process for preparing polyurethane films is disclosed, comprising electrodepositing the film onto a substrate from a polyurethane dispersion. One advantage of the electrodeposition process of the present invention is that there is no need for an additional step to remove coagulants from the films, as with conventional coagulation processes. Another advantage is that in using electrodeposition, the amount of water that must be removed during a dewatering step is minimized. A third advantage is that the resulting film demonstrates much greater uniformity in thickness as compare to films prepared by conventional coagulation techniques. The present invention has applicability in, for example, medical applications.