C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/04 (2006.01) C08G 18/12 (2006.01) C08G 18/32 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/76 (2006.01) C08J 5/18 (2006.01) C08K 5/42 (2006.01)
Patent
CA 2372167
A polyurethane film is disclosed, wherein the film is prepared from a polyurethane dispersion, the dispersion being prepared from a non-ionic polyurethane prepolymer, and the prepolymer being prepared from a polyurethane prepolymer formulation including a diisocyanate and an active hydrogen containing material. The dispersion is formed in a two or more step process wherein, in a first step the prepolymer is formed and, in a subsequent step, an aqueous dispersion of the prepolymer is formed, in the presence of an anionic surfactant, both steps occurring in the substantial absence of an organic solvent. A process for preparing the film and a dispersion useful in making the film are also disclosed. The present invention substantially avoids many of the handling concerns with the dispersions and films of the prior art. Moreover, the present invention is suitable for use in applications such as, for example, medical applications, including gloves, condoms, medical bags, and catheters.
L'invention concerne un film de polyuréthanne préparé à partir d'une dispersion de polyuréthanne, la dispersion étant dérivée d'un prépolymère non ionique de polyuréthanne et le prépolymère étant obtenu à partir d'une formulation de prépolymère de polyuréthanne renfermant un diisocyanate et un matériau contenant un hydrogène actif. On obtient la dispersion en deux étapes au moins au cours desquelles on forme le prépoylmère, puis à partir de ce dernier on forme la dispersion aqueuse du prépolymère en présence d'un tensioactif anionique et ce en l'absence de solvant organique. L'invention concerne aussi la préparation du film et une dispersion aqueuse servant à obtenir ces films. Ainsi, on évite en grande partie les problèmes habituels liés à la manipulation de ces dispersions et de ces films. En outre, l'invention trouve une application notamment dans le domaine médical, plus particulièrement dans la fabrication de gants, de préservatifs, de sacs médicaux et de cathéters.
Bhattacharjee Debkumar
Parks Franklin E.
Sanchez Thelma C.
Dow Global Technologies Inc.
Smart & Biggar
The Dow Chemical Company
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