Rutile mixed pigments with improved gloss and flocking resistance - prepd. by treating pigment with surfactant and coating with metal oxide or hydroxide

摘要

In the prodn. of rutile mixed phase pigments (I) by mixing the starting materials, calcining and milling, a surfactant (II) is added before, during or after milling and then a coating of a hydroxide or hydrated oxide (III) of a gp. II-IV metal, lanthanide or Si is applied. Pref. (III) is an Al or Si (hydr)oxide or hydrated oxide. (II) is a cationic product of formula NR3 or N-OR3 (in which R is H, (cyclo)alkyl or ar(alk)yl); ethylene diamine or a 2-6N polyalkylene-polyamine, esp. N,N'-bis-(3-aminopropyl)-ethylene diamine; alkali phosphate; or an anionic water soluble polyacrylate.