| 摘要 |
<p>A binder for nonwoven fabrics is provided comprising a cationic polyurethane having an ionic charge density sufficient to render the fabric dispersible in aqueous solutions of relatively low ionic strength yet resistant to body fluids. The waterdispersible nonwoven fabrics comprise one or more layers of substantially uniformly laid fibers bound with the cationic polyurethane; exhibit good tensile strength in the presence of body fluids such as urine, blood and menstrual fluid; and can be incorporated in body fluid-retaining products such as sanitary napkins, disposable diapers, surgical dressings and the like. Binders containing condensation residues of a polyisocyante with an aliphatic polyester polyol are biodegradable.</p> |
