-
公开(公告)号：DE3144078A1
公开(公告)日：1983-05-19
申请号：DE3144078
申请日：1981-11-06
Applicant: BASF AG
Inventor： BALZ WERNER DIPL CHEM DR , GUTERMANN WINFRIED , KOVACS JENDE DIPL CHEM DR , OHLINGER MANFRED DIPL CHEM DR , RUDOLF PETER DIPL CHEM DR
Abstract: Magnetic recording media, in particular for video recording, consisting of a nonmagnetic backing material and a magnetisable layer thereon which contains finely dispersed anisotropic magnetic material and nonmagnetic fillers in an organic polymeric binder and standard auxiliaries, and needle-shaped chromium dioxide and/or needle-shaped ferromagnetic metal particles essentially consisting of iron as an additive which limits the optical transparency of the magnetisable layer to not more than 50%.
-
公开(公告)号：DE2920334A1
公开(公告)日：1980-12-04
申请号：DE2920334
申请日：1979-05-19
Applicant: BASF AG
-
公开(公告)号：DE3026696A1
公开(公告)日：1982-02-18
申请号：DE3026696
申请日：1980-07-15
Applicant: BASF AG
Inventor： STECK WERNER DIPL CHEM DR , ROLLER HERMANN , SARNECKI WILHELM DIPL CHEM DR , BALZ WERNER DIPL CHEM DR
Abstract: Ferromagnetic metal particles, consisting essentially of iron and comprising a core, containing not less than 85% by weight of metallic iron, and an iron oxide plus chromium oxide surface layer surrounding this core, which layer additionally contains one or more elements selected from the group comprising zinc, phosphorus in the form of phosphate, aluminum, calcium, strontium, barium, cadmium, lead, cobalt and nickel in a total amount of not more than 9.5% by weight, based on the total amount of the metal particles, and a process for the production of such particles.
-
4.发明专利
公开(公告)号：DE2357517A1
公开(公告)日：1975-05-28
申请号：DE2357517
申请日：1973-11-17
Applicant: BASF AG
Inventor： HARTMANN JOB-WERNER DIPL CHEM , FALK ROLAND DIPL CHEM DR , KRUG ARIBERT , HUBER GEORG , BALZ WERNER DIPL CHEM DR , MAHLER KARL DIPL ING DR
Abstract: The film undergoing the magnetisation process may be applied to both sides of the metallic disc. The film is a mixture of binding material and anisotropic magnetic particles and is applied on the disc in a liquid form. It is spread by centrifugal force, with the disc rotating at high speed. It is magnetised, hardened, ground and then polished. One pair of poles is so arranged that magnetism spreads into the symmetrical plane and forms another even shaped pole pair but of opposite polarity and which converges pointed to the symmetry plane. The distance between the magnetic crests is greater than that of the pole faces and the flux density greates near the poles. The position of the poles is adjustable; during the film application they move toward each other. With this method of film application the reading potential is improved by 50%.
-
Patent Agency Ranking
公开(公告)号：DE3151590A1
公开(公告)日：1983-07-07
申请号：DE3151590
申请日：1981-12-28
Applicant: BASF AG
Inventor： MELZER MILENA DIPL ING , SCHNEIDER NORBERT , KOPKE HELMUT , SCHOETTLE KLAUS DIPL ING , KOESTER EBERHARD DIPL PHYS DR , BALZ WERNER DIPL CHEM DR , GRAU WERNER DIPL CHEM DR
IPC: C08L75/06 , C09D5/23 , C09D171/00 , C09D171/10 , C09D175/06 , G11B5/70 , G11B5/702 , G11B5/84 , G11B5/842 , G11B5/68 , B05D3/00 , B05D5/12
-
公开(公告)号：DE3136982A1
公开(公告)日：1983-03-31
申请号：DE3136982
申请日：1981-09-17
Applicant: BASF AG
-
公开(公告)号：DE3005009A1
公开(公告)日：1981-08-20
申请号：DE3005009
申请日：1980-02-11
Applicant: BASF AG
Inventor： LEHNER AUGUST ING GRAD , HARTMANN HEINRICH DIPL CHEM DR , BACHMANN RUDOLF DIPL CHEM DR , BALZ WERNER DIPL CHEM DR , KOHL ALBERT
Abstract: Magnetic recording media comprising a non-magnetic base and, applied thereto, one or more magnetizable layers based on an anisotropic magnetic material finely dispersed in an organic binder containing an ionomeric polyurethane elastomer, wherein the binder used is a substantially aqueous polyurethane dispersion prepared from a polyurethane solution which has been obtained by reacting a polyisocyanate with an organic polyhydroxy compound in the presence of an organic solvent that is inert to isocyanate groups.
-
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
-
公开(公告)号：DE2312848A1
公开(公告)日：1974-09-26
申请号：DE2312848
申请日：1973-03-15
Applicant: BASF AG
Inventor： STRITZINGER HEINZ DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , BALZ WERNER DIPL CHEM DR , OSTERTAG WERNER DIPL CHEM DR
Abstract: Aluminium or Al alloy discs coated with a magnetic layer contg. 3-9, pref. 4-6 wt.% corundum powder, where pref. 40-60 wt.% of the corundum has a particle size of 110-200% of the thickness of the final ground magnetic layer, the remainder having a size =110% of this thickness. A corundum paste is prepd. by mixing sharp-edged corundum, size 1-10 mu with an epoxy resin having an epoxide equiv. wt. of 1000-2000 made from epichlorohydrin and 2,2-bis(4-hydroxyphenyl)-propane dissolved in toluene and ethylene glycolmonoethylether-monoacetate (I) to form a resin soln. (II). This paste is added to a mixt. of needle-shaped gamma Fe2O3 (average particle length 0.8 mu) with a further amt. of (I) and (II) plus a hardenable melamine-formaldehyde and sprayed on one or both sides of the Al disc (which may first be coated with a laquer) to form a film 3.9-4.4 mu thick. After curing, the surface is ground with rotating discs of porous polyvinyl alcohol sponge using diamond powder (7 mu) and a press. of 0.4 kg/cm2, followed by polishing with felt and diaminod powder (1) mu). The final magnetic layer is 3.8-4.1 mu thick.
-
-
-
-
-
-
-
-
Search Results
9
records
(took 0.018 seconds)
