| abstract |
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 diaminosulfonate salt; The dispersion has an average particle size above 600 nm and gives high opacity and soft feel films that are useful for coating skin, fabrics, paper, cardboard, plastic, wood and metals. |