| 摘要 |
<p>A stable aqs. emulsion comprises a high m.wt. elastic material of (partly)linear structure consisting of macrochains with urethane gps. linked by -NH-NH- and obtd. by dispersing a prepolymer contg. -NCO gps. formed from a polyisocyanate and a macropolyl (opt. with a low m. wt. polyol of functionality 3), using hydrazine as the chain extender. Fibres and films with transparency and good mechanical props.</p> |
