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公开(公告)号：JPS53141604A
公开(公告)日：1978-12-09
申请号：JP5670078
申请日：1978-05-15
Applicant: BASF AG
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公开(公告)号：DE2722078B2
公开(公告)日：1979-10-31
申请号：DE2722078
申请日：1977-05-16
Applicant: BASF AG
Inventor： HUEBNER WERNER DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , DOMAS FRIEDRICH DIPL ING , NAGEL PETER DIPL ING , DEIGNER PAUL DR , KOESTER EBERHARD DIPL PHYS DR , HAUSER HANS
Abstract: A process and apparatus for the manufacture of magnetic recording media, in which, immediately before the magnetic dispersion is applied to a base, the dispersion is subjected to shear by means of a disc rotatably mounted in a housing, by introducing it at the center of rotation of the disc and forcing it through a gap formed between the face of the disc and the wall of the housing, which gap tapers toward the rim of the disc.
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公开(公告)号：FR2391526B1
公开(公告)日：1982-06-25
申请号：FR7814420
申请日：1978-05-16
Applicant: BASF AG
Inventor： HUEBNER WERNER DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , DOMAS FRIEDRICH DIPL ING , NAGEL PETER DIPL ING , DEIGNER PAUL DR , KOESTER EBERHARD DIPL PHYS DR , HAUSER HANS
Abstract: A process and apparatus for the manufacture of magnetic recording media, in which, immediately before the magnetic dispersion is applied to a base, the dispersion is subjected to shear by means of a disc rotatably mounted in a housing, by introducing it at the center of rotation of the disc and forcing it through a gap formed between the face of the disc and the wall of the housing, which gap tapers toward the rim of the disc.
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公开(公告)号：DE2459766A1
公开(公告)日：1976-07-01
申请号：DE2459766
申请日：1974-12-18
Applicant: BASF AG
Inventor： SCHOENAFINGER EDUARD DR , DEIGNER PAUL DR , KOESTER EBERHARD DR , OHLINGER MANFRED DR , SCHAEFER DIETER DR , STUMPFI WERNER DR
Abstract: Chromium dioxide magnetic pigments are stabilised against loss of magnetic properties by (a) treating an alcoholic or aq. alcoholic suspension of the pigment with a hydrolysis prod. of a silane RnSi(CR')4-n where R = 3-18 C aliphatic org. gp., R' = 1-8C aliphatic org. gp. and n=1-3, such that it remains at least partially on the surface of the pigment after separating the pigment from the medium, and (b) drying the treated pigment at ca 50-200 degrees C. gives pigments useful in making magnetic tapes etc. which are resistant to loss of magnetic properties under advers (hot and moist) climatic conditions; gives better protection than known processes in which e.g. a thin chromium oxide layer or an inorg. metal phosphate layer is deposited on the pigment surface. The pigments also have improved dispersibility and processability.
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公开(公告)号：DE2429177A1
公开(公告)日：1976-01-22
申请号：DE2429177
申请日：1974-06-18
Applicant: BASF AG
Inventor： STECK WERNER DR , WUNSCH GERD DR , DEIGNER PAUL DR , OSTERTAG WERNER DR , UHL KARL DR ING
Abstract: In the prodn. of thin cohesive magnetic films based on Fe oxides and opt. Co oxides or their redn. prods. on substrates by gas plating, with thermal decompsn., with complex cpds. (I) of Fe and opt. Co and/or Ni on the hot substrate surface in the presence of O2 and redn. of the oxide film with H2, a crystalline metal oxide film is deposited on the surface at 150-300 degrees C in the presence of an inert gas or inert gas-H2 stream contg. 0.05-1.3 vol.% O2 or 0.25-6.5% air and the oxide film is reduced to a magnetic oxide or metallic film with H2 or H2 mixts. at 250-400 degrees C. Binder-free magnetic films with good adhesion and reproducible magnetic properties can be produced using only 2 stages and under conditions suitable for the Al discs normally used as substrate, for which thermal treatment above 300 degrees C and esp. above 380 degrees C is excluded.
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Patent Agency Ranking
公开(公告)号：DE2405623A1
公开(公告)日：1976-01-08
申请号：DE2405623
申请日：1974-02-06
Applicant: BASF AG
Inventor： KOESTER EBERHARD DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , DEIGNER PAUL DR , UHL KARL DIPL ING DR , STECK WERNER DIPL CHEM DR
Abstract: The magnetic matls., for magnetic recording media, consisting of a non-magnetic substrate and >=2 layers, one of a ferromagnetic phase A and one of an antiferromagnetic phase B, which have a common boundary and thus are coupled magnetically, so that a remanence of different value occurs after satn. in the 2 magnetic polarisation directions below a characteristic temp., the Neel temp., have the alloy CoxNi-x as phase A and the oxide (CoO)x(NiO)1-x as phase B (in which x = 0.04-0.98). The layers of phases A and B pref. are 100-2000 angstrom and 40-2000 angstrom thick respectively and a no. of alternating layers can be used. The layer next to the substrate can contain either phse A or phase B. The matls. have an asymmetrical hysteresis loop, due to the effect of exchange anisotropy, and the Neel temp. can be controlled within wide limits by the compsn.
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公开(公告)号：DE2365179A1
公开(公告)日：1975-07-10
申请号：DE2365179
申请日：1973-12-29
Applicant: BASF AG
Inventor： KOESTER EBERHARD DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , DEIGNER PAUL DR , GRAW DIETER DIPL CHEM DR , UHL KARL DIPL ING DR , STECK WERNER DIPL CHEM DR
Abstract: Magnetic materials which essentially consist of a phase A with a ferromagnetic spin system and a phase B with an anti-ferromagnetic spin system, phases A and B interacting by exchange coupling, and the manufacture of such materials. The materials consist essentially of two-phase magnetic single-domain particles, with the alloy [CoxNi1-x] as the ferromagnetic phase A and its oxidized form [(CoO)x(NiO)1-x] as the anti-ferromagnetic phase B, with values of x of 0.04 to 0.96. They are manufactured by surface oxidation of a pigment layer, which at least covers the surface but may extend deeper, having the composition of phase A, to form an oxide layer, at least 40 A thick, of the phase B, followed by heating in an inert gas atmosphere, or by reduction of a corresponding layer of phase B to a layer of phase A. Magnetic single-domain particles of this composition have a Neel temperature which varies with X. As a result, materials are obtained which have an asymmetrical hysteresis loop, attributable to exchange anisotropy, at temperatures which can be varied within wide limits in accordance with the intended use of the material.
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公开(公告)号：DE3065149D1
公开(公告)日：1983-11-10
申请号：DE3065149
申请日：1980-06-23
Applicant: BASF AG
Inventor： FELLEISEN PETER , MAYER DIETER DR , KOESTER EBERHARD DR , DOMAS FRIEDRICH , DEIGNER PAUL DR
Abstract: A magnetic recording disk comprising a non-magnetic substrate and two or more firmly adhering magnetizable layers applied to one or both sides thereof, the layer located directly on the substrate being magnetically isotropic, while the second layer and any additional layers exhibit orientation of the anisotropic magnetic particles parallel to the substrate and to the envisaged recording direction.
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公开(公告)号：NL7804420A
公开(公告)日：1978-11-20
申请号：NL7804420
申请日：1978-04-25
Applicant: BASF AG
Inventor： HUEBNER WERNER DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , DOMAS FRIEDRICH DIPL ING , NAGEL PETER DIPL ING , DEIGNER PAUL DR , KOESTER EBERHARD DIPL PHYS DR , HAUSER HANS
Abstract: A process and apparatus for the manufacture of magnetic recording media, in which, immediately before the magnetic dispersion is applied to a base, the dispersion is subjected to shear by means of a disc rotatably mounted in a housing, by introducing it at the center of rotation of the disc and forcing it through a gap formed between the face of the disc and the wall of the housing, which gap tapers toward the rim of the disc.
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公开(公告)号：DE2451217A1
公开(公告)日：1976-05-13
申请号：DE2451217
申请日：1974-10-29
Applicant: BASF AG
Inventor： STABENOW JOACHIM DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , DEIGNER PAUL DR , MUELLER FRANZ-JOSEF DIPL CHEM , LOESER WERNER DIPL ING DR , STECK WERNER DIPL CHEM DR
Abstract: A process for metallizing substrates by activation of the substrate by deposition of palladium from a palladium complex, followed by electroless metallization. The palladium is deposited on the substrate by dipping the substrate into a solution of a palladium(O) complex and decomposing this complex at from 100 DEG to 300 DEG C.
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