In other advantageous modes for carrying out the invention, it is preferred that the crude polar vinyl compound contain the polar vinyl compound in an amount of at least 40% by weight, and that especially it be a crude {TAIL ~ N} vinylcarboxamide containing the N vinylcarboxamide in an amount of at least 40% by {HEAD ~ weigh} 
In other advantageous modes for carrying out the invention , it is preferred that the crude polar vinyl compound contain the polar vinyl compound in an amount of at least 40 % by weight , and that especially it be a crude { TAIL ~ N } vinylcarboxamide containing the N vinylcarboxamide in an amount of at least 40 % by { HEAD ~ weigh }
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