公开(公告)号：DE59400978D1

公开(公告)日：1996-12-12

申请号：DE59400978

申请日：1994-03-24

Applicant: BASF AG

Inventor： KLINGELHOEFER PAUL DR ,  SCHWIDETZKY CHRISTOPH DR ,  WIENAND HENNING DR ,  MRONGA NORBERT DR ,  SCHWAB EKKEHARD DR ,  NEBEL MICHAEL

IPC: C01G49/02 ,  C01G49/06 ,  C08K3/22 ,  C08K9/10 ,  C09C1/22 ,  C09C1/24

Abstract: Preparation of transparent yellow iron oxide pigments by precipitation of iron(II) hydroxide by addition of an inorganic base to an iron(II) salt solution and subsequent oxidation to FeOOH, in which a) an aqueous iron(II) salt solution having a molarity of at least 0.5 is first admixed at from 25 to 45@C in the presence of dissolved phosphates and, if desired, zinc salts with sufficient base for from 50 to 70% of the iron(II) ions used to be precipitated as hydroxide, then oxidising gas is passed through the mixture obtained until the pH has dropped to a value

公开(公告)号：DE4310864A1

公开(公告)日：1994-10-06

申请号：DE4310864

申请日：1993-04-02

Applicant: BASF AG

Inventor： KLINGELHOEFER PAUL DR ,  SCHWIDETZKY CHRISTOPH DR ,  WIENAND HENNING DR ,  MRONGA NORBERT DR ,  SCHWAB EKKEHARD DR ,  NEBEL MICHAEL

IPC: C01G49/02 ,  C01G49/06 ,  C08K3/22 ,  C08K9/10 ,  C09C1/22 ,  C09C1/24 ,  C09D17/00

Abstract: Preparation of transparent yellow iron oxide pigments by precipitation of iron(II) hydroxide by addition of an inorganic base to an iron(II) salt solution and subsequent oxidation to FeOOH, in which a) an aqueous iron(II) salt solution having a molarity of at least 0.5 is first admixed at from 25 to 45@C in the presence of dissolved phosphates and, if desired, zinc salts with sufficient base for from 50 to 70% of the iron(II) ions used to be precipitated as hydroxide, then oxidising gas is passed through the mixture obtained until the pH has dropped to a value

公开(公告)号：ES2094580T3

公开(公告)日：1997-01-16

申请号：ES94104663

申请日：1994-03-24

Applicant: BASF AG

Inventor： KLINGELHOEFER PAUL DR ,  SCHWIDETZKY CHRISTOPH DR ,  WIENAND HENNING DR ,  MRONGA NORBERT DR ,  SCHWAB EKKEHARD DR ,  NEBEL MICHAEL

IPC: C01G49/02 ,  C01G49/06 ,  C08K3/22 ,  C08K9/10 ,  C09C1/22 ,  C09C1/24

Abstract: Preparation of transparent yellow iron oxide pigments by precipitation of iron(II) hydroxide by addition of an inorganic base to an iron(II) salt solution and subsequent oxidation to FeOOH, in which a) an aqueous iron(II) salt solution having a molarity of at least 0.5 is first admixed at from 25 to 45@C in the presence of dissolved phosphates and, if desired, zinc salts with sufficient base for from 50 to 70% of the iron(II) ions used to be precipitated as hydroxide, then oxidising gas is passed through the mixture obtained until the pH has dropped to a value