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