abstract |
The present invention relates to a polytrimethylene ether glycol having a number average molecular weight of about 1,000 to about 4,000 and having an unsaturated end group of about 0.003 to about 0.015 meq / g, (b) diisocyanate, and (c) diol or diamine chain. To polyurethanes or polyurethane-ureas prepared from extenders, and to their preparations, intermediates and uses. |