公开(公告)号：JPS61238992A

公开(公告)日：1986-10-24

申请号：JP7566786

申请日：1986-04-03

Applicant: BASF AG

Inventor： HORUSUTO BURUUDAA ,  UORUFUGANGU HAABERUMAN ,  UDOO MAIYAA ,  PEETAA HAMUMESU

IPC: C25B3/10 ,  C09B11/00 ,  C25B3/02

Abstract: 1. A process for the preparation of a water-soluble diaminotriphenylmethane dye containing from 2 to 4 sulfo groups by anodic oxidation of the leuco compound in an electrolysis cell which is divided into two compartments, wherein the leuco compound is subjected to anodic oxidation at an oxygen overvoltage of

公开(公告)号：JPS6353283A

公开(公告)日：1988-03-07

申请号：JP20323987

申请日：1987-08-17

Applicant: BASF AG

Inventor： UORUFUGANGU HAABERUMAN ,  UDOO MAIYAA ,  PEETAA HAMUMESU ,  BERUNTO RANDOMAN

IPC: C25B3/02

Abstract: A process for the preparation of a water soluble food-grade diaminotriphenylmethane colorant containing from 2 to 4 sulfo groups, comprising anodically oxidizing the corresponding leuco compound in an electrolysis cell divided into an anode space and a cathode space in the presence of from 0.01 to 2% by weight, based on the solution being oxidized, of a C2-C4-alkanol, urea, a urea derivative or a mixture thereof, at a potential epsilon h

公开(公告)号：JPS58153790A

公开(公告)日：1983-09-12

申请号：JP2494783

申请日：1983-02-18

Applicant: BASF AG

Inventor： UORUFUGANGU HAABERUMAN ,  PEETAA HAMUMESU ,  YOAHIMU FUERUGAA ,  KAARUURUUDOUITSUHI HOTSUTA ,  FURIIDORITSUHI BURUNMIYURAA ,  HERUMUUTO KUNITSUTERU ,  YOAHIMU KURANTSU ,  RORUFU SHIYUNAIDAA ,  PEETAA TOOMA

IPC: C09C1/26 ,  C25B1/00