公开(公告)号：DE896265C

公开(公告)日：1953-11-09

申请号：DEB0007606

申请日：1942-03-29

Applicant: BASF AG

Inventor： AMBROS OTTO DR ,  HOPFF HEINRICH DR ,  SCHNABEL RICHARD DR

IPC: C08K5/134

公开(公告)号：DE2538792A1

公开(公告)日：1977-03-17

申请号：DE2538792

申请日：1975-09-01

Applicant: BASF AG

Inventor： SCHOENAFINGER EDUARD DR ,  DEIGNER PAUL DR ,  KOESTER EBERHARD DR ,  OHLINGER MANFRED DR ,  SCHAEFER DIETER DR ,  STUMPFI WERNER DR ,  AMORT JUERGEN DR ,  SEILER CLAUS-DIETRICH DR ,  NESTLER HEINZ DR ,  AMBROS OTTO DR

IPC: C09C1/34 ,  C09C3/12 ,  G11B5/706 ,  G11B5/62

Abstract: Stabilisation of magnetic dioxide pigments for prepn. of magnetic registering matls. is effected by (a) suspending the pigment in an aqs. and/or alcoholic medium (b) treating the suspended pigment with a silane of formula RnSi(OR')4-n (where R is a 1-18C org. gp; R' is a 1-8C aliphatic org. gp.; and n is 1-3), or with a hydrolysis prod. of this silane, so that least partly hydrolysed silane is situated on the surface of the pigment, after the latter has been separated from the medium, and (c) drying the separated pigment at 50-200 degrees C. Retain their good magnetic properties, even under unfavourable climatic, e.g. hot and humid conditions. The pigments are also easily dispersed and worked.

公开(公告)号：DE895765C

公开(公告)日：1953-11-05

申请号：DEB0006171

申请日：1943-04-01

Applicant: BASF AG

Inventor： AMBROS OTTO DR ,  BAUER ERWIN DR

IPC: C07C29/00 ,  C07C29/03

公开(公告)号：DE896264C

公开(公告)日：1953-11-09

申请号：DEB0007319

申请日：1942-05-05

Applicant: BASF AG

Inventor： AMBROS OTTO DR ,  HOPFF HEINRICH DR ,  SCHNABEL RICHARD DR

IPC: C08K5/13