Abstract: A magnetic recording medium including a magnetic layer 93 containing ferromagnetic powder and a binder, a support 91, and a backcoat layer 94, provided in this order, and being obtained by slitting to width a magnetic material of broad width and continuous length. The magnetic recording medium has no ridge protruding above the surface plane of the magnetic layer along the slit edge thereof. The magnetic recording medium achieves large recording capacity, is free from the tape pack problems such as appearance of a radial pattern and the output reduction problem, produces no fine scrapings in high speed running, which would cause head clogging and dropouts, thereby exhibiting good running durability and electromagnetic characteristics, and is particularly useful for computer data storage applications.

Abstract: A magnetic tape comprising: a coating layer containing ferromagnetic powder and a binder; a support; and a back layer, in this order, which satisfies the following conditions (1) to (3): (1) on a cut plane of the tape, an apex of a biggest convexity of the support does not protrude from a line connecting an apex of a biggest convexity of the coating layer and an apex of a biggest convexity of the back layer; (2) a Young's modulus in a thickness direction of a surface of the magnetic layer is from 1,000 to 2,500 kg/mm2 (from 9.8 to 24.5 GPa); and (3) a Young's modulus in a thickness direction of a surface of the back layer is from 600 to 2,000 kg/mm2 (from 5.9 to 19.6 GPa).

Abstract: A magnetic tape comprising: a coating layer containing ferromagnetic powder and a binder; a support; and a back layer, in this order, which satisfies the following conditions (1) to (3): (1) on a cut plane of the tape, an apex of a biggest convexity of the support does not protrude from a line connecting an apex of a biggest convexity of the coating layer and an apex of a biggest convexity of the back layer; (2) a Young's modulus in a thickness direction of a surface of the magnetic layer is from 1,000 to 2,500 kg/mm2 (from 9.8 to 24.5 GPa); and (3) a Young's modulus in a thickness direction of a surface of the back layer is from 600 to 2,000 kg/mm2 (from 5.9 to 19.6 GPa).

Abstract: A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer, said magnetic layer comprising ferromagnetic particles and a binder, wherein nonmagnetic support has a transverse-direction Young's modulus of at least 1,000 Kg/mm.sup.2, said magnetic layer has a glass transition temperature of 80.degree. to 100.degree. C., and said magnetic recording medium has a total thickness of less than 12 .mu.m, and further a magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer, said magnetic layer comprising ferromagnetic particles and a binder, wherein said magnetic recording medium is adapted for use with a magnetic head having a core width of at least 100 .mu.m at a speed of at least 20 m/sec based upon relative speed of said recording medium and said head, said nonmagnetic support has a transverse-direction Young's modulus of at least 1,000 Kg/mm.sup.2, said magnetic layer has a glass transition temperature of from 80.

Abstract: A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer on one surface of the nonmagnetic support and a backing layer on the other surface thereof and having a thickness of from 10 to 40 .mu.m, wherein the surface of an edge of the medium which is to be in contact with the inner surface of the flange of a reel of a magnetgic tape cassette, the flange being a base for aligning the edge of the medium when the medium is wound around the reel, is depressed in such a way that the cross sectional area of the depression portion (11) (FIG.

Abstract: An electrolytic processing method for electrolytically processing the surface of a metallic member. A paste containing an electrolyte is prepared by mixing a paste-forming agent with a liquid electrolyte. The paste is placed between the metallic member and an opposing electrode. The metallic member and the opposing electrode are connected to an electrical power supply so that an electrical current is made to flow between the metallic member and the opposing electrode through the paste containing electrolyte, whereby the surface of the metallic member is electrolytically processed. Descaling, passivity treatment, coloring, polishing, plating and other electrolytic process can be performed on any type of metallic member at any desired place, by suitably selecting factors such as the compositon of the paste, condition of the electrical power supply and so forth.

Abstract: A magnetic tape cassette having a guide pole which is in sliding contact with the magnetic surface of the tape produced in such a manner as to improve the running characteristics of the tape while being capable of being manufactured at a low cost. A cylindrical stainless steel base member is subjected to a barreling treatment so as to secure fine particles of an inorganic material having a Moh's hardness of greater than 9 to the slide surface of the guide post. Moreover, the surface of the guide pole can be finished by a surface rolling to reduce the number of scratch-like grooves in the slide surface having a depth of more than 0.2 .mu.m and a width of less than 40 .mu.m to less than 11 per millimeter in the sliding direction of the tape.

Abstract: A magnetic tape cassette having a guide pole which is in sliding contact with the magnetic surface of the tape produced in such a manner as to improve the running characteristics of the tape while being capable of being manufactured at a low cost. A cylindrical stainless steel base member is subjected to a barreling treatment so as to secure fine particles of an inorganic material having a Moh's hardness of greater than 9 to the slide surface of the guide post. Moreover, the surface of the guide pole can be finished by a surface rolling to reduce the number of scratch-like grooves in the slide surface having a depth of more than 0.2 .mu.m and a width of less than 40 .mu.m to less than 11 per millimeter in the sliding direction of the tape.

Abstract: A magnetic tape cassette having a guide pole which is in sliding contact with the magnetic surface of the tape produced in such a manner as to improve the running characteristics of the tape while being capable of being manufactured at a low cost. A cylindrical stainless steel base member is subjected to a barreling treatment so as to secure fine particles of an inorganic material having a Moh's hardness of greater than 9 to the slide surface of the guide post. Moreover, the surface of the guide pole can be finished by a surface rolling to reduce the number of scratch-like grooves in the slide surface having a depth of more than 0.2 .mu.m and a width of less than 40 .mu.m to less than 11 per millimeter in the sliding direction of the tape.

Abstract: A magnetic recording medium comprising a nonmagnetic support, a first magnetic recording layer and a second magnetic recording layer, superposed in order, wherein:a coercive force of the second magnetic recording layer is in the range of 400 to 2,000 Oe, a ratio of said coercive force to a coercive force of the first magnetic recording layer being in the range of 1.0 to 2.5;a mean longitudinal length of a magnetic powder contained in the second magnetic recording layer is not longer than 0.35 .mu.m, a ratio of said mean longitudinal length to a mean longitudinal length of a magnetic powder contained in the first magnetic recording layer being in the range of 0.4 to 1.0;anda mixed area of compositions of the first magnetic recording layer and the second magnetic recording layer which has a thickness of 0.1 to 1.1 .mu.m is provided between the first and second magnetic recording layers.

Abstract: A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, wherein said ferromagnetic particles have a tabular ratio (table diameter/table thickness) of 2 or more, a table diameter of from 0.01 to 10 .mu.m, and a lamination degree of the magnetic particles in the magnetic layer in a cross-section thereof of 2 or more.

Abstract: A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided on opposite surfaces a magnetic recording layer and a backing layer containing two types of carbon black and a binder and having a thickness of 2 .mu.m or less, one of said carbon black being fine carbon black having an average particle size of 30 to 100 m.mu. and the other of said carbon black being coarse carbon black having an average particle size of 150 to 500 m.mu., and the mixing weight ratio of said carbon black and the binder being 1:1.5 to 1:3.5.