Title:
POLYURETHANE FILMS PREPARED FROM POLYURETHANE DISPERSIONS
Document Type and Number:
WIPO Patent Application WO2000061653
Kind Code:
A3
Abstract:
A process for preparing a polyurethane film comprising two steps is disclosed. The first step comprises preparing a nonionic prepolymer formulation, the prepolymer formulation comprising a diisocyanate, an active hydrogen containing material, and a monol. The second step comprises preparing an aqueous dispersion of the prepolymer, in the presence of a surfactant. Both steps occur in the substantial absence of an organic solvent. Also disclosed is a polyurethane film and an aqueous dispersion useful for preparing such films. The present invention has the advantage of having increased shear stability. The dispersions of the present invention do not settle or coagulate prematurely. Moreover, the films of the present invention do not include the dermal irritants which occur in natural rubber latex. The films and dispersions of the present invention are thus suitable for use in applications such as, for example, medical applications.
Inventors:
KOONCE WILLIAM A
PARKS FRANKLIN E
BHATTACHARJEE DEBKUMAR
PARKS FRANKLIN E
BHATTACHARJEE DEBKUMAR
Application Number:
PCT/US2000/009969
Publication Date:
February 22, 2001
Filing Date:
April 13, 2000
Export Citation:
Assignee:
DOW CHEMICAL CO (US)
International Classes:
A61B19/04; A61F6/04; A61J1/10; A61L29/00; A61M25/00; C08G18/00; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/48; C08G18/65; C08G18/76; C08J5/18; (IPC1-7): C08G18/08; C08G18/10; C08G18/65; C08G18/28
Domestic Patent References:
| WO1998041554A1 | 1998-09-24 | |||
| WO1998031760A1 | 1998-07-23 |
Foreign References:
| US5589563A | 1996-12-31 |
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