公开(公告)号：DE3808070A1

公开(公告)日：1989-09-21

申请号：DE3808070

申请日：1988-03-11

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR ,  MRONGA NORBERT DR ,  GRAESSLE ULRICH DR

IPC: C09C1/36 ,  C09C1/00 ,  C09C1/40 ,  C09C3/00 ,  C09C3/06 ,  C09D5/36

Abstract: To prepare especially bluish nacreous pigments, TiO2-coated mica pigments are treated with ammonia at from 750 to 850 DEG C with constant agitation. The optical layer thickness of the titanium dioxide (TiO2) coating is from 50 to 100 nm or from 300 to 340 nm.

公开(公告)号：DE3718446A1

公开(公告)日：1988-12-15

申请号：DE3718446

申请日：1987-06-02

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR

IPC: C09C1/24 ,  C09C1/40 ,  A61K7/021 ,  C01G49/06 ,  C03C17/23 ,  C04B41/85 ,  C09C3/06

Abstract: A flake-form (leaf) two-phase pigment consists of a core with a haematite structure of composition AlxFe2-xO3, in which x has a value of 0.02 to 0.5, and an outer layer with a spinel structure of composition AlyFe3-yO4+z, in which y has values from 0.03 to 0.75 and z has values from 0 to 0.5. The pigments can be prepared by a hydrothermal treatment of AlxFe2-xO3 pigment flakes (where x is from 0.02 to 0.5) in the presence of a reducing agent which is dissolved in the aqueous phase.

公开(公告)号：DE3411215A1

公开(公告)日：1985-10-10

申请号：DE3411215

申请日：1984-03-27

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR ,  BAUER ROLAND ,  BOCK GUSTAV DR

IPC: C09C1/22 ,  C01G49/00 ,  C04B14/36 ,  C08J3/20 ,  C08K3/22 ,  C09D17/00

公开(公告)号：DE3160562D1

公开(公告)日：1983-08-11

申请号：DE3160562

申请日：1981-07-09

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR ,  BITTLER KNUT DR ,  BOCK GUSTAV DR

IPC: C08K9/00 ,  C08K9/02 ,  C08L67/00 ,  C09C1/00 ,  C09C1/40 ,  C09C3/00 ,  C09C3/06 ,  C09D5/00

Abstract: Flaky mica pigments coated with metal oxides are prepared by oxidizing vaporizable metal carbonyls to metal oxides with oxygen at an elevated temperature in the presence of mica flakes which are kept in motion. The amount of carbonyls introduced into the reaction zone does not exceed 5% by volume of the amount of other gases introduced. The coated mica pigments are employed as pigments in surface coatings, plastics and glasses.

公开(公告)号：DE2723156A1

公开(公告)日：1978-12-07

申请号：DE2723156

申请日：1977-05-23

Applicant: BASF AG

Inventor： OSTERTAG WERNER DR ,  WUNSCH GERD DR ,  KIENER VOLKER DR ,  ERTL GERT DR ,  HETZEL ECKHARD DIPL ING ,  SCHREINER SIEGFRIED DR ,  VOELKL ERFRIED DR ,  KOESTER HARTWIG DR

IPC: C01B17/66

Abstract: Prodn. of anhydrous Na dithionite (I) by reacting SO2 with Na formate and NaOH in aq. -alcoholic medium, is now carried out in presence of alkali and/or ammonium salts of oxalic acid and/or EDTA. Pref. the concn. of chelating agent at the end of reaction is not below 0.001 g./l. Decomposition of (I) induced by metal ions (esp. Fe, Cr and Ni, introduced with the reactants or generated by corrosion of the reactor) is inhibited by the chelating agents.