Patent ID: 6025317
Filing Date: 2000-02-15
Classification: C08F,C11D

Abstract:
A porous polymer which is in powder form and contains N-vinylimidazole units, which is obtained by free-radical precipitation polymerization ofa) 5-100% by weight of a monomer selected from the group consisting of at least one N-vinylimidazole monomer of the formula ##STR7## where R.sup.1, R.sup.2 and R.sup.3 are identical or different and are H, C.sub.1 -C.sub.4 -alkyl, monomers of the formula ##STR8## where R.sup.4 and R.sup.5 are identical or different and together form a ring of 3 to 5 methylene groups,N-vinylaxazolidone, N-vinyltriazole, 4-vinylpyridine N-oxide and mixtures of said monomers,b) 0-95% by weight of other copolymerizable monoethylenically unsaturated monomers selected from the group consisting of a (meth acrylic ester, a (meth) acrylamide, a vinyl ester, an unsaturated carboxylic acid, an acrylic ester which has a basic nitrogen atom, 2-vinylpyridine and 4-vinylpyridine; andc) 0-50% by weight of at least one monomer with at least two non-conjugated ethylenic double bondsin aqueous solution which contains 0.5-30% by weight of at least one electrolyte and, based on the monomers employed, 0.5-80% by weight of at least one surfactant.