| 摘要 |
MIXTURES OF PREPOLYMERS CONTAINING URETHANE GROUPS AND DIISOCYANATOTOLUENES AND THEIR USE The present invention is directed to a liquid mixture, a method of preparing a foam with the liquid mixture and the resultant foam; said liquid mixture having a viscosity at 25.degree.C of 5 to 100 mPas and an NCO content of 35 to 47% by weight and comprising: a) a liquid prepolymer containing urethane groups and having an NCO content of 5 to 30% by weight which is a reaction product of: a1) a polyisocyanate or a polyisocyanate mixture is of the diphenylmethane series, and a2) a polyester polyol having a molecular weight of 500 to 10,000 in a substoichiometric quantity; in admixture with b) a diisocyanatotoluene and/or component a1), in a ratio by weight of a) to b) of 1:20 to 20:1.
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