| http://www.w3.org/ns/prov#value | - It is of course possible to usemixtures of the above-mentioned compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, for example mixtures of polyethers and polyesters.In some cases, it is particularly advantageous to combine low-melting and high-melting polyhydroxyl compounds with one another (German Offenlegungsschrift No. 2,706,
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