Patent ID: 6533975
Filing Date: 2003-03-18
Classification: C08G,C08J,C08K,D01F,Y10T

Abstract:
A process for preparing a fiber or film comprising a wet- or dry-spun product or a solution cast product, which comprises a polyurethane and layers delaminated from a lamellar clay, said layers being dispersed in said polyurethane, the process comprising the steps of:(a) contacting a solution comprising a polyurethane and an aprotic polar solvent with a lamellar clay, or with a dispersion of said lamellar clay in the aprotic polar solvent, to form a polyurethane/clay dispersion; (b) agitating the polyurethane/clay dispersion sufficient to delaminate all or apportion of said layers from the lamellar clay and from each other; and (c) wet- or dry-spinning the polyurethane/clay dispersion or solution casting the polyurethane/clay dispersion to form a fiber or film.