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公开(公告)号：JPS5226202A
公开(公告)日：1977-02-26
申请号：JP9750676
申请日：1976-08-17
Applicant: BASF AG
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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
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).
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3.发明专利
公开(公告)号：DE2501372A1
公开(公告)日：1976-07-22
申请号：DE2501372
申请日：1975-01-15
Applicant: BASF AG
Inventor： ROLLER HERMANN , WOLLNIK MANFRED DIPL ING DR , HARTMANN HANS-JOERG DIPL ING D , FALK ROLAND DIPL CHEM DR , GUTERMANN WINFRIED , REUTHER ECKHARD DIPL PHYS DR
Abstract: Flexible magnetic recording tapes are coated on the reverse side with a 0.5-2 mu m thick non-magnetic conductive layer (A) of conductive pigments and opt. other pigments, with total pigment content 15-80 wt %, in a polymer binder, and an outer non-magnetic layer (B) with thickness 0.3-1 um, of a polymer binder with pigment content 0-10%. The tapes are coated with (A) using a polyester-urethane binder with added polyisocyanate, in an inert volatile org. solvent, drying, and coating with (B) using a binder contg. OH gps. with a solids content of which 0-10 wt % is an accelerator for the addn. reaction to the NCO gps., 0-30% is a lubricant and 0-10% is a non-magnetic pigment. Wear resistance of the back of the tape is improved by coating with (B). Even after 500 passes through a video-recorder, only sight signs of wear are visible, whereas without (B) signs of abrasion can be seen after 10-20 passes and even good commercial tapes show heavy wear after 150 passes. The surface conductivity, and roughness required for good winding performance, are not adversely affected by presence of (B).
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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%.
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公开(公告)号：GB1562601A
公开(公告)日：1980-03-12
申请号：GB3433176
申请日：1976-08-18
Applicant: BASF AG
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Patent Agency Ranking
公开(公告)号：DE2446488A1
公开(公告)日：1976-04-08
申请号：DE2446488
申请日：1974-09-28
Applicant: BASF AG
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公开(公告)号：DE3117670A1
公开(公告)日：1982-11-25
申请号：DE3117670
申请日：1981-05-05
Applicant: BASF AG
Inventor： UHL KARL DIPL ING DR , FALK ROLAND DIPL CHEM DR , SAND RUDOLF , NAGEL PETER DIPL ING
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公开(公告)号：DE2842941A1
公开(公告)日：1980-04-10
申请号：DE2842941
申请日：1978-10-02
Applicant: BASF AG
Inventor： FALK ROLAND DIPL CHEM DR , FEHRENBACH HUBERT ING GRAD
Abstract: The substrates are kept in a horizontal position while they are conveyed through a spraying chamber, in which the substrates rest via changing point contact on a support. Vertical streams of an acid soln. are sprayed for a specified time downwards and upwards from nozzles onto the substrates to form the chromate. The substrates are then washed with water and dried via warm air. During the spraying of the acid soln., the nozzles are pref. subjected to swivel or yawing motions. The finely machined surface of the Al is passivated by a chromate layer prior to the deposition of a magnetisable layer, to obtain good corrosion resistance, and good adhesion of the magnetisable layer. The process improves the quality of the passivation.
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公开(公告)号：NL7609132A
公开(公告)日：1977-02-22
申请号：NL7609132
申请日：1976-08-17
Applicant: BASF AG
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公开(公告)号：DE2443663A1
公开(公告)日：1976-03-25
申请号：DE2443663
申请日：1974-09-12
Applicant: BASF AG
Inventor： NAGEL PETER DIPL ING , GRAU WERNER DIPL CHEM DR , MAIER HERMANN DR , WITTKAMP HEINRICH DIPL ING , FALK ROLAND DIPL CHEM DR , WILLMANN PAUL ING GRAD
Abstract: A high-speed roller system for transporting webs of sheeting, preferably for coating the same with a magnetic layer, comprising a suction roller for control of the speed of the web, which suction roller has a surface containing grooves, preferably rhombic grooves, in which the perforations for sucking the sheeting are disposed, preferably at the points of intersection, the ratio of the total cross-sectional area of the perforations to the total surface area of the roller being from 0.7 to 3%.
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