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公开(公告)号：EP0125478A3
公开(公告)日：1987-05-13
申请号：EP84103878
申请日：1984-04-09
Applicant: International Business Machines Corporation
Abstract: A servo track in the form of a patterned thin metallic film (15; 25) is disposed between a magnetic record medium (14;: 24) and a dielectric substrate (12; 22). The dielectric substrate (12; 22) can be in the form of a coating on a metallic substrate (11; 21). Where the magnetic record medium is composed of magnetic particles bound in a matrix, the matrix and the dielectric substrate are preferably composed of the same material. An additional layer (26, Figure 2) of dielectric material may be disposed between the metallic servo track film (25) and the magnetic record medium (24).
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公开(公告)号：EP0122611A3
公开(公告)日：1986-03-26
申请号：EP84104162
申请日：1984-04-12
Applicant: Takeda Chemical Industries, Ltd.
Inventor： Shiraki, Hiroyuki , Abe, Tetsuro
CPC classification number: C09D175/16 , C08G18/672 , C08G18/758 , Y10S428/90 , Y10T428/31551 , C08G18/42 , C08G18/664
Abstract: A urethane acrylate resin obtained by reacting a polyisocyanate with a polyester polyol having a molecular weight of 500 to 3,000, a low-molecular-weight polyol having a molecular weight of 60 to 400 and a hydroxyalkyl acrylate containing at least 70 mole % of a monohydroxyalkyl acrylate at an NCO/OH equivalent ratio in the range of 0.7 to 1.20. The composition comprising the above urethane acrylate resin affords crosslinked products having extremely excellent, tough physical properties, and can therefore be advantageously employed, for example, for base coatings for paper and polyethylene films prior to vacuum metallizing, protective coatings after vacuum metallizing, covering materials for electromagnetic tapes and floppy discs, vehicles for printing ink, adhesives. etc.
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53.发明公开
公开(公告)号：EP0101591A3
公开(公告)日：1986-03-26
申请号：EP83107757
申请日：1983-08-06
Applicant: Agfa-Gevaert AG
Inventor： Gerum, Johannes, Dr. , Nippe, Burkhard, Dr. , Kober, Heinrich, Dr.
CPC classification number: H01F1/44 , G11B5/7013 , H01F1/442
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公开(公告)号：EP0080204A3
公开(公告)日：1985-10-02
申请号：EP82110790
申请日：1982-11-23
Applicant: Hitachi Maxell Ltd.
Inventor： Akahane, Naoto , Yamaguchi, Yoshitaka , Matsuura, Takeshi , Watatani, Seiji
IPC: G11B05/70
CPC classification number: G11B5/70 , G11B5/7305 , Y10S428/90
Abstract: A magnetic recording medium such as a magnetic tape, which comprises a base film, a magnetic layer having an elastic modulus at 1% elongation of not less than 1,200 kg/mm 2 totally In both longitudinal and width direction which is higher than that of the base film, said magnetic layer being formed on one surface of the base film, and a backcoat layer having an elastic modulus at 1% elongation of not less than 1,200 kg/mm 2 totally In both longitudinal and width directions which is higher than that of the base film, said backcoat layer being formed on another surface of the base film, said magnetic recording medium having a total thickness of not more than 17 µ, said magnetic recording medium having excellent mechanical strength and being used without buckle and injury during usage even in a thin thickness.
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公开(公告)号：EP0083011A3
公开(公告)日：1985-07-03
申请号：EP82111523
申请日：1982-12-11
Applicant: BASF Aktiengesellschaft
Inventor： Melzer, Milena , Schneider, Norbert , Kopke, Helmut , Schoettle, Klaus , Koester, Eberhard, Dr. , Balz, Werner, Dr. , Grau, Werner, Dr.
CPC classification number: G11B5/7022 , C08L75/06 , C08L71/00
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Patent Agency Ranking
公开(公告)号：EP0080205A3
公开(公告)日：1985-07-03
申请号：EP82110791
申请日：1982-11-23
Applicant: Hitachi Maxell Ltd.
Inventor： Miyata, Kazushi Hitachi Maxell Shataku A-3-1 , Hidaka, Toshiro , Watatani, Seiji , Matsuura, Takeshi
IPC: G11B05/70
CPC classification number: G11B5/7022
Abstract: A magnetic recording medium such as a magnetic tape, which comprises a base carrier and a magnetic layer formed on the base carrier, which is characterized in that the binder for forming the magnetic layer on the base carrier comprises a combination of at least one of resins selected from the group consisting of a vinyl chloridevinyl acetate copolymer resin, a polyvinylidene chloride resins, a phenoxy resin, an acrylic resin and a fibrillar resin, and a polyurethane resin containing 15% by weight or more of 4,4'-diphenylmethane diisocyanate, and optionally an isocyanate compound having a low molecular weight, said magnetic recording medium having excellent mechanical strength, excellent electrical characteristics and durability and being used without undesirable buckle, injury, curl of edge thereof during usage even in a thin thickness.
Abstract translation: 一种磁记录介质，例如磁带，其包括基底载体和形成在基底载体上的磁性层，其特征在于，用于在基底载体上形成磁性层的粘结剂包括至少一种树脂 选自氯乙烯乙酸乙烯酯共聚物树脂，聚偏二氯乙烯树脂，苯氧基树脂，丙烯酸树脂和纤维状树脂的组合物，以及含有15重量％以上4,4,4-三苯基甲烷二异氰酸酯的聚氨酯树脂， 和任选的具有低分子量的异氰酸酯化合物，所述磁记录介质具有优异的机械强度，优异的电特性和耐久性，并且在使用期间即使在薄的厚度下也能够使用而不需要任何扣环，损伤，边缘的卷曲。
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公开(公告)号：EP0090499A3
公开(公告)日：1985-04-03
申请号：EP83301031
申请日：1983-02-25
Applicant: TORAY INDUSTRIES, INC.
Inventor： Asakura, Toshiyuki , Kobayashi, Hiroaki , Itoh, Nobuaki
CPC classification number: G11B5/64 , G11B5/7305 , Y10S428/90 , Y10T428/24355 , Y10T428/265 , Y10T428/31681 , Y10T428/31725
Abstract: A magnetic recording medium comprises a film of an aromatic polyamide having at least 50 mole % of recurring units represented by the following general formula:
wherein m and n are integers of from 0 to 4, with the proviso that the case where both of m and n are 0 is excluded, and at least one high performance magnetic layer of a metal or metal compound vacuum-deposited on the aromatic polyamide film. This magnetic recording medium shows a reduced dimensional change and is substantially free of curling or breakage due to elongation, and is excellent in flatness and adhesive strength between the base film and the magnetic layer. Accordingly, this magnetic recording medium is suitable for high-density magnetic recording.Abstract translation: 磁记录介质包括芳族聚酰胺薄膜，其具有至少50摩尔％由以下通式表示的重复单元：其中m和n是从0到4的整数，条件是m和 排除n为0，并在该芳香族聚酰胺膜上真空沉积至少一层金属或金属化合物的高性能磁性层。 该磁记录介质显示出尺寸变化减小，并且基本上没有由于延伸导致的卷曲或断裂，并且在基膜和磁性层之间的平坦性和粘合强度优异。 因此，该磁记录介质适合于高密度磁记录。
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公开(公告)号：EP0075991A3
公开(公告)日：1984-09-26
申请号：EP82201166
申请日：1982-09-20
Applicant: Hitachi Maxell Ltd.
Inventor： Fumio, Togawa , Shigeo, Aoyama
CPC classification number: G11B5/706 , G11B5/70673 , G11B5/70694 , Y10S428/90 , Y10T428/257 , Y10T428/269 , Y10T428/2991 , Y10T428/31678
Abstract: An improved magnetic recording medium suitable for a high density recording, which has a squareness ratio in vertical direction being 0.6 or more and an orientation ratio (squareness ratio in vertical direction/squareness ratio in lengthwise direction) being 0.7 or more and is prepared from acicular magnetic iron oxide particles having crystalline magnetic anisotropy and a ratio of Fe 2+ /Fe 3+ of 0.05 or less wherein cobalt ion is uniformly doped, said particles having preferably a particle size of 0.3 µ or less and an axial ratio of 6 to 10, and a method for the production thereof.
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公开(公告)号：EP0075083A3
公开(公告)日：1983-08-17
申请号：EP82106246
申请日：1982-07-13
Applicant: International Business Machines Corporation
Inventor： Blumentritt, Bruce Frederick , Shen, John Chen Syan
IPC: G11B05/70
CPC classification number: G11B5/7013 , G11B5/7021
Abstract: A magnetic recording coating composition having a high density of magnetic particles uniformly dispersed in a high performance, thermoset polyurethane resin binder with the dispersion applied as a thin coating onto a rigid substrate. The thermosetting resin binder comprises a blocked isocyanate polymer reacted with a hydroxy terminated or branched polymer. The coating composition has an extended shelf life and can be cured at temperatures below 375°F to produce a smooth, hard, though durable and well dispersed magnetic coating with an improved orientation ratio that readily accepts buffing, washing, and lubrication.
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60.发明公开Polyfunctional aziridine crosslinking agents for aqueous magnetic recording media binder 失效用于水性磁记录介质粘结剂的多官能亚胺基交联剂
公开(公告)号：EP0039165A3
公开(公告)日：1981-12-23
申请号：EP81301615
申请日：1981-04-13
Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY
Inventor： Pendergrass, Daniel B.
CPC classification number: G11B5/7028 , C08K5/3412
Abstract: In the manufacture of magnetic recording media, coatings are applied from water-borne dispersions of inorganic particles, a polymer containing functional groups and an agent for crosslinking the polymer, the crosslinking agent being a polyfunctional aziridine such as
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