Polyurethane films prepared from polyurethane dispersions

Details Polyurethane films prepared from polyurethane dispersions Polyurethane films prepared from polyurethane dispersions

C - Chemistry, Metallurgy

08

G

C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/28 (2006.01) C08G 18/48 (2006.01) C08G 18/65 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2369066

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.

L'invention concerne un procédé de préparation d'un film de polyuréthanne consistant à préparer une formulation prépolymère non ionique renfermant un diisocyanate, un matériau contenant un hydrogène actif et un monol, puis à préparer une dispersion aqueuse du prépolymère en présence d'un tensioactif et ce, en l'absence de solvant organique. Font aussi l'objet de cette invention un film de polyuréthanne et une dispersion aqueuse servant à préparer ces films. Ainsi, ces films sont dotés d'une stabilité à l'usure améliorée. Les dispersions utilisées ne durcissent ni ne coagulent prématurément. En outre, les films ne comprennent pas d'irritants cutanés contrairement au latex caoutchouc naturel. Ces films et ces dispersions sont spécialement indiqués pour des applications médicales, entre autres.

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