| http://www.w3.org/ns/prov#value | - A drawback of the examples stated above, which (almost) exclusively use polyether polyols as the B component, is the fact that a large amount of fossil raw materials must be provided for the synthesis thereof, and consequently, they cause a very high CO2 emission (on the one hand, the epoxides are ultimately produced from compounds obtainable from petrol, mainly ethene and propene; on the other ha
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