| 摘要 |
Aqueous dispersions containing anionic polyurethanes are prepared by reacting a prepolymer A), obtained from aliphatic or cycloaliphatic diisocyanates, polytetramethylene glycol and one or more anionic or potentially anionic polyols, with a chain extender B) which is a diamine sulfonate salt; the dispersion have a medium particle size above 600 nm and give films of high opacity and soft-feel touch which are useful for the coating of leather, fabrics, paper, cardboard, plastic, wood and metals. |
