C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
260/178, 260/199
C09B 45/04 (2006.01) C09B 45/01 (2006.01) C09B 47/04 (2006.01) C09B 50/00 (2006.01) C09B 67/54 (2006.01)
Patent
CA 1315275
HOE 87/F 256 K ABSTRACT: A process for the reduction of the ionogenic heavy metal content in the preparation of metal complex dyestuffs Free radical heavy metal ions in water-soluble heavy metal complex dyestuffs are removed from the syn- thesis solution of the heavy metal complex dyestuff by means of a compound or several of the compounds mentioned below: a) saturated and unsaturated fatty acids having about 8 to 18 carbon atoms and water-soluble salts thereof; b) the monoesters and diesters of orthophosphoric acid and salts thereof corresponding to the general formula (1a) and (1b) Image Image (1a) (1b) in which R denotes a saturated or unsaturated ali- phatic radical having about 3 to 18 carbon atoms and M stands for a hydrogen atom or a salt-forming, water-solubilizing metal; c) aliphatic sulfonic acids and water-soluble salts thereof corresponding to the general formula (2) R-SO3M (2) in which R and M have the abovementioned meanings; d) aliphatic phosphonic acids and monoesters thereof and also water-soluble salts thereof corresponding to the general formulae (3a) and (3b) Image Image (3a) (3b) in which R and M have the abovementioned meanings; e) malonic acid and water-soluble salts thereof; f) trimercapto-s-triazine, 2-aminobenzoic acid, 8-hydroxyquinoline and water-soluble salts of these compounds; g) water-soluble sulfides, in particular alkali metal sulfides; h) functionalized water-insoluble polymers which react with metal ions by the ion-exchanger principle or form metal chelate complexes. Using these compounds, the excess heavy metal ions are precipitated out of the synthesis solution or separated off, without the heavy metal ions bound as a complex in the dye being attached.
576259
Mischke Peter
Mrotzeck Uwe
Russ Werner
Schwaiger Gunther
Sittig Manfred
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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