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公开(公告)号：DE2355840A1
公开(公告)日：1975-05-22
申请号：DE2355840
申请日：1973-11-08
Applicant: BASF AG
Abstract: A process for the manufacture of improved magnetic discs by applying a thin layer of a fluid dispersion of magnetic pigments and optional non-magnetic pigments in a binder mixture to a non-magnetic rigid base and curing the magnetic layer which has been applied. The binder consists essentially of from 60 to 90 percent by weight of a solid curable polycondensate of 2,2-bis-(4-hydroxyphenyl)-propane and epichlorohydrin having an epoxide equivalent weight of approximately 400 to 5,000, from 5 to 25 percent by weight of a curable allyloxybenzene-formaldehyde condensate of the resol type with free or alcohol-etherified methylol groups and a molecular weight of less thah 1,000, and from 5 to 30 percent by weight of a curable melamine-formaldehyde condensate with more than two alcohol-etherified methylol groups and a molecular weight of less than 3,000, from 10 to 35 percent by weight of the above epoxy resin being replaced by a reaction product of an epoxy group-containing polycondensate of 2,2-bis-(4-hydroxyphenyl)-propane and epichlorohydrin with the N-methylolamide of a copolymerizable olefinically unsaturated carboxylic acid of 3 to 5 carbon atoms. The magnetic layers thus produced adhere firmly to the base, can be readily ground and polished and are particularly resistant to wear when the magnetic discs are in use.
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公开(公告)号：DE2722078C3
公开(公告)日：1980-07-10
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：FR2391526A1
公开(公告)日：1978-12-15
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：DE2722078A1
公开(公告)日：1978-11-23
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：DE2461937A1
公开(公告)日：1976-07-08
申请号：DE2461937
申请日：1974-12-31
Applicant: BASF AG
Inventor： OHLINGER MANFRED DIPL CHEM DR , STRITZINGER HEINZ DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , SCHOENAFINGER EDUARD DIPL CHEM
Abstract: In the prodn. of acicular alpha-Fe2O3 (I) by pptn. of hydrated alpha-Fe2O3 (II) from aq. Fe(II) salt solns. with alkali, with simultaneous oxidn. with air, and dehydration, polymers (III) contg. carboxyl gps. with an acid no. of over 50, pref. 80-220, are added during the prodn. of (I). (III) pref. is added to the (II) suspension in an amt. of 1.5-10, esp. 3-6 (wt.) pts/100 pts. (II). (III) can be (co)polymers of an alpha,beta-unsatd. carboxylic acid or reaction prods. of phthalic acid or anhydride with polyalcohols. (I) is used for the prodn. of acicular gamma-Fe2O3 (IV), which is used for low-noise magneto-gram carriers. The (I) obtd. gives esp. low-noise (IV) with good controllability and without additional process stages.
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Patent Agency Ranking
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公开(公告)号：NL181608C
公开(公告)日：1987-09-16
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：GB1599712A
公开(公告)日：1981-10-07
申请号：GB1956278
申请日：1978-05-15
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：DE2653723A1
公开(公告)日：1978-06-01
申请号：DE2653723
申请日：1976-11-26
Applicant: BASF AG
Inventor： HARTMANN JOB-WERNER DIPL CHEM , OHLINGER MANFRED DIPL CHEM DR , HAMMON FRITZ , WETTSTEIN EUGEN
Abstract: A magnetic recording material is prepd. by appln. of is not 1 layer of a dispersion onto a non-magnetic carrier and converting the layer into a hard magnetic layer of predetermined thickness. The dispersion contains (a) a finely divided magnetic powder and (b) dispersed SiO2 with particle dimensions of ratio 6-8:2.5-4:1, and with average particle size corresp. to the thickness of the magnetic layer, in (c) a soln. of an organic polymeric binder in an organic solvent. The dispersion may also contain the usual additives. The material has high mechanical strength, and shows no increase in friction between the magnetic layer and the magnetic head at high temp. and humidity. Deposition of material on the head is avoided.
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公开(公告)号：DE2364878A1
公开(公告)日：1975-07-03
申请号：DE2364878
申请日：1973-12-28
Applicant: BASF AG
Inventor： ROLLER HERMANN , STRITZINGER HEINZ DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , SCHNEIDER WALTER
Abstract: A magnetic recording tape consists of a non-magnetic carrier film, a magnetic layer contg. a finely divided magnetic pigment in a binder, and on the back of the carrier a non-magnetic backing layer, with higher electrical conductivity than the carrier, consisting of a mixt. of (A) an organic polymeric binder and (B) a powder mixt. of (a) 15-60 (15-35) pts. wt. conducting carbon black particles, (bi) 5-40(25-35) pts. of a reaction rpod. of montmorillonite, Al2(OH)2 Si4O10 .H2O, with an alkylammonium base, or (b2) 15-85 pts. of a powdered mixt. of 15-90(24-31) wt. % flaky silicate particles with Mohs hardness >6(>5) and 85-10 wt. % cubic or spherical particles of hard, durable oxides of Al, Si and/or Cr, and (c) 20-55 pts. wt. of a finely divided inorganic non-magnetic filler. The backing layer resists rapid coiling of the tape, is not sensitive to dust, and has improved bonding and crack-resistance. (A) The binder is esp. an elastomeric polyurethane free from NCO, prepd. from a polyester of a 4-6C aliphatic dicarboxylic acid and 3-10C diol, and a 6-24C (8-20C) diisocyanate, with a glycol extender; the polyurethane may be mixed with is not >40 (10-30) wt. % of other binders, e.g. vinyl(idene) chloride polymers or an epoxy resin, esp. from bisphenol A and epichlorohydrin. Copolymers of 70-95(75-90) wt. % vinyl chloride and 50-5% of a 1-3C alkyl ester of a 3-5C unsatd. acid may also be used as binder, e.g. a copolymer of 70-90% vinyl chloride, 5-15% dimethyl maleate and 5-15% diethyl maleate.
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