| http://www.w3.org/ns/prov#value | - After the addition of a basic catalyst, for example sodium methylate, potassium tertiary butylate, potassium hydroxide, sodium hydroxide, sodium hydride, potassium hydride or an alkaline ion exchanger in an amount of 0,1 to 15%, by weight with reference to the addition product obtained in the first step of the propoxylation, further amounts of propylene oxide are added to the reaction product of t
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