| 摘要 |
A mixt. of polyurethanes comprises a first polyurethane with at least two end gps., each comprising a terminal isocyanate and a polyether; a second polyurethane with at least two end gps., each comprising a terminal isocyanate and a non-function gp.; and a third polyurethane with at least two end gps., one comprising a terminal isocyanate and a polyether and the other a terminal isocyanate and a non-fuctional gp. An aq. compsn. pref. comprises 0.005-20 wt.% of the polyurethane mixture. Also claimed is a mixt. of polyurethanes comprises a polyurethane contg. two end gps., one of which comprises a terminal isocyanate and a polyether and the other of which comprises a terminal isocyanate and a non-functional gp. Pref., the polyether is an alkyl or aryl polyether alcohol, esp. polyethylene glycol methyl ether or polypropylene glycol methyl ether. The non-functional gp. is derived from 1-octa-decanol. The three polyurethanes are present in amts. of 8.3-25, 25-75 and 16.7-50 mole %, esp. 12.5-25, 25-62.5 and 25-90 mole %. |
