公开(公告)号：FI891130A

公开(公告)日：1989-09-12

申请号：FI891130

申请日：1989-03-09

Applicant: BASF AG

Inventor： OSTERTAG WERNER ,  MRONGA NORBERT ,  GRAESSLE ULRICH

IPC: C09C1/36 ,  C09C1/00 ,  C09C1/40 ,  C09C3/00 ,  C09C3/06 ,  C09D5/36 ,  C09C

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：DE3636156A1

公开(公告)日：1988-04-28

申请号：DE3636156

申请日：1986-10-24

Applicant: BASF AG

Inventor： OSTERTAG WERNER

IPC: C01G49/00 ,  C09C1/00 ,  C09C1/22 ,  C09C1/24 ,  C09C1/40 ,  C09D5/36 ,  A61K7/021 ,  C03C8/14 ,  C03C17/23 ,  C04B41/85 ,  C08J3/20 ,  C09C3/00 ,  C09D11/02 ,  C09D17/00

公开(公告)号：CA1119379A

公开(公告)日：1982-03-09

申请号：CA300102

申请日：1978-03-30

Applicant: BASF AG

Inventor： OSTERTAG WERNER ,  WUNSCH GERD ,  KIENER VOLKER ,  HETZEL ECKHARD ,  SCHREINER SIEGFRIED ,  LEUTNER BERND ,  SCHLIMPER HANS-ULRICH ,  VOELKL ERFRIED

IPC: C01B17/66 ,  C07C51/00 ,  C07C53/06 ,  C07C67/00

Abstract: In a process for the manufacture of sodium dithionite by reacting sulfur dioxide with sodium formate and aqueous sodium hydroxide solution in the presence of methanol, an aqueous methanolic solution of sodium formate is first produced by reacting carbon monoxide with sodium hydroxide solution in an aqueous medium, containing from 1 to 50% by weight of methanol, based on the amount of water, at from 80 to 120.degree.C under a pressure of from 10 to 40 bars. The resulting aqueous methanolic solution can be reacted directly, in the conventional manner, with sulfur dioxide and aqueous sodium hydroxide solution to give sodium dithionite. The process has the advantage that in the first step the reaction gives, within a short period and at a relatively low temperature, aqueous methanolic solutions of sodium formate, which in the second step can be directly converted to sodium dithionite.

公开(公告)号：CA1028208A

公开(公告)日：1978-03-21

申请号：CA209635

申请日：1974-09-18

Applicant: BASF AG

Inventor： NEUMANN UTE ,  ROLLER HERMANN ,  HARTMANN JOB-WERNER ,  HACK JOACHIM ,  MOTZ HERBERT ,  OSTERTAG WERNER

IPC: C07F9/09 ,  C08K5/521 ,  C09D5/23 ,  C09D7/12 ,  G11B5/71 ,  G11B5/72 ,  G11B5/725

Abstract: Coated magnetic recording media, especially video tapes and computer tapes, comprising a non-magnetic base carrying a magnetic coating which consists of a dispersion, essentially containing a finely divided magnetic pigment in an organic binder and at least one lubricant. A compound of the formula in which n is an integer of from 1 to 3 and R is alkyl, alkoxyalkyl or aralkyl, each of 3 to 18 carbon atoms, is used as a lubricant. The products have high abrasion resistance coupled with only little transfer of material to the magnetic heads even under fluctuating climatic conditions.

公开(公告)号：CA1002822A

公开(公告)日：1977-01-04

申请号：CA185447

申请日：1973-11-09

Applicant: BASF AG

Inventor： HARTMANN JOB W ,  OSTERTAG WERNER ,  SAND RUDOLF ,  SCHAEFER DIETER ,  HARTMANN HANS J

IPC: C08L63/00 ,  G11B5/708 ,  G11B5/73 ,  G11B5/733

Abstract: The invention relates to magnetic discs in which first a non-magnetic intermediate layer and then the magnetic coating are applied by conventional methods to an aluminum disc. The intermediate layer applied to the non-magnetic metallic carrier disc is a hard non-magnetic coating which can be polished and which consists of a dispersion of a pulverulent mixture of finely divided inorganic non-magnetic pigments having a Mohs' hardness of at least 7 in a binder which can be cured and which provides firm cohesion of the pigment particles and good adhesion thereof to the non-magnetic base disc, the pigment mixture containing at least 3 percent by weight of corundum powder having a particle size of from about 1 to 20 mu u. Magnetic discs with very thin magnetic coatings which possess good magnetic and mechanical properties and whose thickness varies only minimally are thus produced in a simple manner.