| http://www.w3.org/ns/prov#value | - In order to properly adjust the desired mechanical properties, for example hardness, di-tetrafunctional, preferably difunctional compounds having molecular weights from 60 to 600, preferably from 60 to 300, may be used as the chain extenders and/or crosslinking agents, preferably, aliphatic, cycloaliphatic, or araliphatic diols having from 2 to 14, preferably 4 to 10 carbon atoms, triols having fr
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