摘要:
Chemical impurities contained in N-vinylpyrrolid-2-one are bound by a process in which the anhydride of an organic carboxylic acid is added to the crude N-vinylpyrrolid-2-one.
摘要:
A process for the preparation of low-hydrazine polymers based on basic vinyl monomers by free-radical solution polymerization in aqueous medium in the presence, as compound which forms free radicals, of an azo compound which has alkoxycarbonyl groups on the carbon atoms adjacent to the azo group.
摘要:
Water-emulsifiable polyisocyanates containing a) aliphatic, cycloaliphatic and aromatic polyisocyanates and b) reaction products of the abovementioned polyisocyanates with polyvinylpyrrolidones which have at least one group which is reactive with isocyanate.