公开(公告)号：DE2319363A1

公开(公告)日：1974-11-07

申请号：DE2319363

申请日：1973-04-17

Applicant: BASF AG

Inventor： HARTMANN HANS-JOERG DIPL ING D ,  FALK ROLAND DIPL CHEM DR ,  GAWLIK PETER DIPL ING DR ,  BALZ WERNER DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  SCHAEFER DIETER DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR

IPC: C09D5/23 ,  G11B5/702 ,  G11B5/68

公开(公告)号：DE2446486A1

公开(公告)日：1976-04-15

申请号：DE2446486

申请日：1974-09-28

Applicant: BASF AG

Inventor： VAETH GUENTER ,  HARTMANN HANS-JOERG DIPL ING D ,  UHL KARL DIPL ING DR ,  GUTERMANN WINFRIED ,  BERGER HEINZ ING GRAD

IPC: G11B23/50 ,  G11B5/008

Abstract: The flexible cleaning arrangement (11) is provided with openings for loosening the particles whilst in contact with the surface of the magnetic tape (6) and moves relative to the movement of the magnetic tape (6). The particles loosened from the magnetic tape (6) are continuously sucked through the loosening openings (12). A number of loosening openings (12) can be indirectly altered, preferably by a rapid alternating movement of the cleaning arrangement (11) relative to the surface of the magnetic tape (6).

公开(公告)号：DE2749757A1

公开(公告)日：1979-05-10

申请号：DE2749757

申请日：1977-11-07

Applicant: BASF AG

Inventor： VAETH GUENTER ,  OHLINGER MANFRED DIPL CHEM DR ,  HARTMANN HANS-JOERG DIPL ING D ,  VELIC MILAN DIPL ING DR ,  MUENZNER WULF DIPL ING DR

IPC: G11B5/706 ,  G11B5/712 ,  G11B5/68 ,  C09C1/34

Abstract: Magnetic recording material has a non-magnetic substrate with a firmly adhering magnetic coating of acicular ferromagnetic CrO2 finely dispersed in an organic polymeric binder and additives. Before incorporation in the binder, the CrO2 is suspended in an aq. soln. of the Fe(II) salt and a reducing agent, the Fe)II) ions are pptd. on the CrO2 as Fe(OH)2 by addn. of water-soluble hydroxide or carbonate and this Fe(OH)2 is then converted to an oxide deposit contg. Fe(III) by treatment with a gaseous or water-miscible oxidant. The oxide deposit pref. consists of goethite and/or lepidocrocite or magnetite. The Fe oxide deposit improves the stability and mechanical properties of the CrO2 under unfavourable climatic conditions.

公开(公告)号：DE2428690A1

公开(公告)日：1976-01-02

申请号：DE2428690

申请日：1974-06-14

Applicant: BASF AG

Inventor： VAETH GUENTER ,  HARTMANN HANS-JOERG DIPL ING D ,  FALK ROLAND DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  GUTERMANN WINFREID ,  MAYER DIETER DR

IPC: G11B5/71 ,  G11B5/72

Abstract: A laminated magnetogram carrier, esp. UTR tape, with a layer, based on finely-divided magnetic pigment dispersed in a binder and suitable for magnetic recording, on a non-magnetisable support, contains 0.2-4, pref. 0.4-2 wt%, w.r.t. the wt. of the magnetic pigment, of a mixt. of aliphatic 14-18C monocarboxylic acids with m.pt. 50-60, pref. 52-55 degrees C. The acids are pref. added to the dispersion before application to the support.

公开(公告)号：DE2535448A1

公开(公告)日：1977-02-24

申请号：DE2535448

申请日：1975-08-08

Applicant: BASF AG

Inventor： LOWENBERG GUSTAV DIPL ING ,  HARTMANN HANS-JOERG DIPL ING D ,  SCHAEFER DIETER DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR ,  JAKUSCH HELMUT DIPL PHYS DR

IPC: G11B5/708 ,  C09D5/23 ,  C09D7/12 ,  C09D131/02 ,  C09D177/00 ,  C09D177/06 ,  G11B5/70 ,  G11B5/702 ,  G11B5/68

公开(公告)号：DE2455288A1

公开(公告)日：1976-06-24

申请号：DE2455288

申请日：1974-11-22

Applicant: BASF AG

Inventor： VAETH GUENTER ,  FRISCHMANN HARALD DR ,  HARTMANN HANS-JOERG DIPL ING D ,  GUTERMANN WINFRIED

IPC: C08K5/101 ,  C09D5/23 ,  G11B5/702 ,  G11B5/71 ,  H01B3/30 ,  G11B5/68

公开(公告)号：DE2442762A1

公开(公告)日：1976-03-25

申请号：DE2442762

申请日：1974-09-06

Applicant: BASF AG

Inventor： VAETH GUENTER ,  BACHMANN RUDOLF DIPL CHEM DR ,  HARTMANN HEINRICH DIPL CHEM DR ,  HARTMANN HANS-JOERG DIPL ING D ,  SPOOR HERBERT DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  LEHNER AUGUST ING GRAD ,  MOTZ HERBERT DIPL ING DR

IPC: C08G18/00 ,  C08G18/65 ,  C08G18/66 ,  C09D5/23 ,  G11B5/702 ,  G11B5/68 ,  C09D3/72

公开(公告)号：DE2318910A1

公开(公告)日：1974-10-31

申请号：DE2318910

申请日：1973-04-14

Applicant: BASF AG

Inventor： VAETH GUENTER ,  BACHMANN RUDOLF DIPL CHEM DR ,  SENKPIEL WERNER DIPL CHEM DR ,  HARTMANN HANS-JOERG DIPL ING D ,  FALK ROLAND DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR

IPC: C09D5/23 ,  G11B5/702 ,  G11B5/68

Abstract: The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

公开(公告)号：DE2753694A1

公开(公告)日：1979-06-07

申请号：DE2753694

申请日：1977-12-02

Applicant: BASF AG

Inventor： MOTZ HERBERT DIPL ING DR ,  LEHNER AUGUST ING GRAD ,  HARTMANN HEINRICH DIPL CHEM DR ,  BACHMANN RUDOLF DIPL CHEM DR ,  HARTMANN HANS-JOERG DIPL ING D ,  FRISCHMANN HARALD DR ,  FALK ROLAND DIPL CHEM DR ,  HACK JOACHIM DIPL CHEM ,  VELIC MILAN DIPL ING DR

IPC: C08G18/66 ,  C09D5/23 ,  G11B5/70 ,  G11B5/702 ,  G11B5/68

Abstract: Magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment dispersed in a binder which contains at least 50 percent by weight of a special polyurethane elastomer, namely a thermoplastic polyurethane which is soluble in tetrahydrofuran, is free from isocyanate groups and has been manufactured from (A) 1 mole of a hydroxyl-containing polyester having a molecular weight of from 700 to 2,500, (B) from 0.3 to 3 moles of a linear aliphatic diol of 2 to 10 carbon atoms, (C) from 0.05 to 0.4 mole of a triol of 3 to 10 carbon atoms, and (D) from 1.35 to 4.7 moles of a diisocyanate of 6 to 30 carbon atoms, the amount of NCO groups being approximately equivalent to the amount of OH groups of the sum of components (A) to (C).

公开(公告)号：DE2446487A1

公开(公告)日：1976-09-02

申请号：DE2446487

申请日：1974-09-28

Applicant: BASF AG

Inventor： VAETH GUENTER ,  NAGEL PETER DIPL ING ,  HARTMANN HANS-JOERG DIPL ING D ,  UHL KARL DIPL ING DR ,  GUTERMANN WINFRIED ,  MAYER DIETER DR

IPC: G11B5/73 ,  G11B5/70 ,  B29D17/00

Abstract: Laminated magnetogram carrier consists of (1) flexible polyethylene terephthalate having a thickness of 4-36 mu m, (2) opt. a bond-promoting intermediate layer, and (3) a magnetic, image-registering layer consisting of a finely divided magnetic pigment in a binder. Layer (1) possesses an average surface roughness (Rz) of 0.05-0.20 mu m, and a max. point roughness (Rt) of is not >200 of the average surface roughness. Gives video signals having a low grass noise and a satisfactory mitte value. Percentage of reject carriers is greatly reduced.