公开(公告)号：JPH08333435A

公开(公告)日：1996-12-17

申请号：JP10980596

申请日：1996-04-30

Applicant: BASF MAGNETICS GMBH

Inventor： BRODT GREGOR ,  SCHELBLE JOSEF ,  LEHNER AUGUST ,  WEINGART FRANZ ,  KOHL ALBERT ,  KRESS RIA ,  SCHNEIDER NORBERT

IPC: C08L75/04 ,  C08G18/10 ,  C08G18/62 ,  C08G18/65 ,  C08G18/83 ,  C08L75/00 ,  C08L101/00 ,  C08L101/12 ,  C09D5/23 ,  G11B5/702 ,  G11B5/73 ,  G11B5/704

公开(公告)号：GB2265907A

公开(公告)日：1993-10-13

申请号：GB9307328

申请日：1993-04-07

Applicant: BASF MAGNETICS GMBH

Inventor： HUEBLER GERHARD ,  SCHELBLE JOSEF

IPC: C08G18/62 ,  C08K5/13 ,  C08L75/04 ,  G11B5/702 ,  G11B5/71 ,  G11B5/72 ,  C08L59/00 ,  C08L77/00

Abstract: In a magnetic recording medium comprising a nonmagnetic substrate and at least one magnetizable layer which is applied thereon and is based on an acicular ferromagnetic iron oxide finely distributed in a polymeric binder and further conventional additives, unsaturated organic compounds are present as additives in the magnetizable layer and the magnetic layer contains an additive of the general formula where R is H, CH3, C2H5 or C3H7.n

公开(公告)号：DE19516784A1

公开(公告)日：1996-11-14

申请号：DE19516784

申请日：1995-05-11

Applicant: BASF MAGNETICS GMBH

Inventor： BRODT GREGOR ,  WEINGART FRANZ ,  LEHNER AUGUST ,  KOHL ALBERT ,  KRESS RIA ,  SCHELBLE JOSEF ,  SCHNEIDER NORBERT

IPC: C08G18/10 ,  C08G18/62 ,  C08G18/65 ,  C08G18/83 ,  C08L75/00 ,  C08L101/00 ,  C08L101/12 ,  C09D5/23 ,  G11B5/702 ,  G11B5/73 ,  C08L75/04 ,  C09D17/00

Abstract: Polymeric materials (I), suitable for use as dispersing resins, are obtd. by reacting (1) a polymer (II) of (a) 80-100 mole% (1-25C alkyl)-ester of an alpha , beta -unsatd. carboxylic acid, (b) 0-20 mole% other comonomer(s) and (c) a starter and/or regulator to produce OH end gps. on most of the polymer chains with (2) a polyfunctional isocyanate (III) to give a prod. (IV), using a mole ratio of (NCO gps.):(OH gps. in II) = 1.2-3.9, and (3) reacting (IV) with (a) a cpd. contg. NCO-reactive gps., with a ratio of 2-7 moles reactive gps. per mole free NCO gps. in (IV), and then reacting the prod. obtd. (VI) with a cpd. (VII) which reacts with the free reactive gps. to introduce acid gps., or (b) a NCO-reactive cpd. (VIII) which itself enables the introduction of acid gps. Also claimed is (i) this process as such, (ii) pigment prepns. contg. a pigment (pref. a magnetic pigment) and material (I), and (iii) magnetic recording materials contg. magnetic pigments treated with (I).