| 摘要 |
The present invention relates to reactive compositions containing (A) NCO prepolymers based on (cyclo)aliphatic polyisocyanates having an NCO content of 1 to 8 wt.% and a monomeric polyisocyanate content of less than 2 wt.%, (B) amine-free chain extenders containing at least 50 equivalent percent of a compound melting between 50.degree. and 160.degree.C having formula (I) HO-X-Y-X-OH (I) wherein Y denotes methylene, ethylene, -C~C-, 1,4-, 1,3-, or 1,2-cyclohexylene, or 1,4-, 1,3-, or 1,2-phenylene, and X denotes methylene, -OCH2CH2- (wherein oxygen is bonded to group Y), or 1,4-, 1,3-, or 1,2-cyclohexylene, and (C) 0 to 20 wt.%, relative to component (A), of inert organic solvents, wherein the equivalent ratio of the free NCO groups of component (A) to the NCO-reactive groups of component (B) is 0.90 to 1.35.
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