HYDROPHILIC COPOLYMERS BASED ON N-TRIS(HYDROXY-METHYL)METHYLACRYL AMIDE, PROCESS FOR THEIR PREPARATION, AQUEOUS GEL OF THESE COPOLYMERS AND THEIR USE AS ION EXCHANGERS

摘要

Tridimensional cross-linked random copolymers, insoluble in water, containing in copolymerized form: (a) 25% to 98% by weight of N-[tris(hydroxymethyl)methyl]acrylamide or N-[tris(hydroxymethyl)methyl]methacrylamide, or a mixture of these two compounds. (b) 2% to 50% by weight of one or more monomers containing two or several polymerizable ethylenic double bonds and free from anionic or cationic functional groups, and (c) 0.1% to 50% by weight of one or more monomers containing a polymerizable ethylenic double bond and one or more mono- or di-substituted amino, pyrimidinyl, guanidyl, purinyl, quaternary ammonium, SO3H or SO3M groups, M being an alkali metal. These copolymers are utilizable, in the form of aqueous gels, as ion exchangers.