The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1987
Filed:
Jan. 17, 1986
Jurg Merz, Biel-Benken, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Novel chemically modified anionic polysaccharides which contain acid radicals of the formula ##STR1## attached to the polysaccharide component, wherein R.sub.1.sup..crclbar. is carboxyalkyl or dicarboxyalkyl containing 1 to 5 carbon atoms in the alkyl moiety, or is carboxyphenyl or ketocarboxymethyl, and Q.sub.1.sup..sym. is a water-soluble cation, are obtained by reacting the polysaccharides with compounds that contain N-methylolamide groups, in particular with novel compounds of formula ##STR2## wherein R.sub.1.sup..crclbar. and Q.sub.1.sup..sym. have the given meanings, and are used for purifying effluents and, in particular, for the separation by chromatography of mixtures of substances which contain amphoteric or cationic components.