Patent ID: 9725576
Date: 2017-08-08
CPC Classifications: B03D,C01P,C04B,C08K,C09C,D21H

Claim:
1. A process for manufacturing a white pigment containing product comprising the following steps: a) providing at least one white pigment and impurities containing material, b) providing at least one collector agent selected from the group consisting of compounds of formula (1), wherein R 1 represents a hydrocarbon group containing from 6 to 30 carbon atoms, A 1 represents an alkylene group having from 1 to 6 carbon atoms, E 1 , E 2 and E 3 , are identical or different from each other, each independently chosen from among alkylene oxide groups containing from 1 to 6 carbon atoms, n 1 , n 2 and n 3 , are identical or different from each other, each independently chosen from an integer which value is from 1 to 20, p is 1, 2, 3 or 4, and compounds of formula (2) wherein R 21 represents a hydrocarbon group containing from 6 to 30 carbon atoms, R 22 and R 23 are identical or different from each other, each independently chosen from among hydrocarbon groups containing from 1 to 6 carbon atoms, R 24 represents hydrogen or a hydrocarbon group containing from 1 to 6 carbon atoms, A 2 represents an alkylene group having from 1 to 6 carbon atoms, and q is 1, 2, 3 or 4, and mixtures of compounds (1) and (2), c) mixing the white pigment and impurities containing material of step a) and the collector agent of step b) in an aqueous environment to form an aqueous suspension, d) passing gas through the suspension formed in step c), and e) recovering the white pigment containing product by removing a white pigment bearing phase from the aqueous suspension obtained after step d).