公开(公告)号：DE3742628A1

公开(公告)日：1989-06-29

申请号：DE3742628

申请日：1987-12-16

Applicant: DEGUSSA

Inventor： GRATZFELD EVERHARD ,  CLAUSEN EVA ,  WINKELER HEINRICH

IPC: C01G49/00 ,  C09C1/22 ,  C09C1/26

公开(公告)号：CA1165510A

公开(公告)日：1984-04-17

申请号：CA387667

申请日：1981-10-09

Applicant: DEGUSSA

Inventor： GRATZFELD EVERHARD ,  CLAUSEN EVA ,  REINHARDT HELMUT ,  SCHAEFER HANS

IPC: C09D11/00 ,  C01C3/12 ,  C01G49/00 ,  C09C1/00 ,  C09C1/22 ,  C09C1/26 ,  C09D11/02

Abstract: An iron blue pigment ("DIN 55 906") is prepared by precipitating white paste and then oxidizing the white paste. Alkali metal ions such as sodium ions and potassium ions, cyanide or hexacyanoferrate(II) ions, and iron(II) ions are used as starting materials. The iron blue pigment of the invention contains potassium in an amount between 0.5 and 4.5% preferably between 0.5 and 2.0% by weight, sodium in an amount between 0.1 and 1.0% by weight, ammonium in an amount from 2.0 to 4.5% by weight, proferably between 3.0 and 4.5% by weight, has a tinting strength, when tested in accordance with "DIN 52 204" and "DIN 53 234" exceeding the tinting strength of "Vossenblau 705" the German colour standard for iron blue pigments by between 5 and 15%, and has colour differences (determined in accordance with "DIN 53 204" and "DIN 53 234" in combination with "DIN 6174" with "Vossenblau 705" as standard) which are: .DELTA.L : - 0.7 to -1.5 .DELTA.a : - 0.5 to 1.5 .DELTA.b : - 0.6 to -2.3 .DELTA.C : 0.5 to 2.0 To save potassium ions in the preparation of iron blue pigments, of the invention, the precipitation of white paste is done in two stages. The alkali metal ions which are used in the precipitation of white paste are: potassium ions in the first stage and sodium ions in the second stage. The soluble byproducts of the reaction are then removed, ammonium salts are added, and the white paste obtained in this manner is aged and oxidised thereafter in a conventional manner and recovered as an iron blue pigment. The iron blue pigment can be utilised as pigment in the preparation of printing inks, paints and enamels, and as a colourant in fungicides.

公开(公告)号：CA1029505A

公开(公告)日：1978-04-18

申请号：CA215632

申请日：1974-12-10

Applicant: DEGUSSA

Inventor： REINHARDT HELMUT ,  TREBINGER KARL ,  KALLRATH GOTTFRIED ,  GRATZFELD EVERHARD ,  CLAUSEN EVA

IPC: C01C3/12 ,  C09C1/26

公开(公告)号：DE1792418A1

公开(公告)日：1971-11-11

申请号：DE1792418

申请日：1968-08-31

Applicant: DEGUSSA

Inventor： GRATZFELD EVERHARD ,  CLAUSEN EVA ,  OTT GUENTER

IPC: C09C1/00 ,  C09C1/26 ,  C09D17/00