-
公开(公告)号：JP2001354851A
公开(公告)日：2001-12-25
申请号：JP2001094855
申请日：2001-03-29
Applicant: TORAY INDUSTRIES
Inventor： TSUKUDA AKIMITSU , HORIUCHI MITSUHIRO , ITO NOBUAKI
Abstract: PROBLEM TO BE SOLVED: To provide an aromatic polyamide film highly slight in loss and aggregation of the microparticles therein. SOLUTION: This aromatic polyamide film is made from a resin composition containing an aromatic polyamide, at least one kind of dissimilar polymer and at least one kind of microparticles, wherein for at least one carbon atom as a constituent of the dissimilar polymer's main chain, 13C-NMR spectrum's peak intensity ratio S/S0 (wherein S0 is the peak intensity of the 13C-NMR spectrum measured in the form of a solution of the dissimilar polymer alone; S is the peak intensity of the 13C-NMR spectrum measured in the form of a solution of a mixture of the aromatic polyamide and the dissimilar polymer at a weight ratio of 10:4) is 0
-
公开(公告)号：JP2000344912A
公开(公告)日：2000-12-12
申请号：JP16066599
申请日：1999-06-08
Applicant: TORAY INDUSTRIES
Inventor： CHIKUGI TOSHIHIRO , HORIUCHI MITSUHIRO , TSUKUDA AKIMITSU
Abstract: PROBLEM TO BE SOLVED: To obtain the subject film excellent in electromagnetic transducing characteristics, smoothness, friction characteristics to a magnetic head or the like and handleability, and useful for a magnetic recording media by limiting surface properties within specific values. SOLUTION: A solution dissolving an aromatic polyamide and/or an aromatic polyimide is formed into a film by a film-producing method by using the solution. Voronoi distribution as protrusions formed on the surface of the obtained film is carried out, and a relative standard deviation (σ/Xbar) (Xbar is an average area of the Voronoi polygons; σ is the standard deviation) is regulated so as to be =50 mol.% repeating unit of the formula NH-Ar1-NH-CO-Ar2-CO (Ar1 and Ar2 are each phenylene or the like) or the like, and the polyimide preferably has >=50 mol.% repeating unit of formula I (Ar4 is formula II or the like; Ar5 is phenylene or the like) or the like.
-
公开(公告)号：JP2000290402A
公开(公告)日：2000-10-17
申请号：JP10230899
申请日：1999-04-09
Applicant: TORAY INDUSTRIES
Inventor： TSUKUDA AKIMITSU , SUEOKA MASANORI , HORIUCHI MITSUHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a film capable of forming surface microprotrusions with slight surface coarse protrusions and developing excellent surface properties by using an aromatic polysulfone and an aromatic polyamide. SOLUTION: This film comprises (A) an aromatic polyamide and (B) an aromatic polysulfone having 235-400 deg.C glass transition temperature and has =0.27 μm height/100 cm2 in at least one surface. The component B preferably has 0.2-1.2 dL/g intrinsic viscosity. The constituent ratio of the components A and B of the film is preferably 90-99.9 wt.% of the component A and 0.1-10 wt.% of the component B based on the whole film. In the film, the number of surface protrusions having 5-30 nm height is preferably 2,000,000-30,000,000/mm2. The film is suitable as a magnetic recording medium having a high output and defectless properties.
-
公开(公告)号：JP2000273215A
公开(公告)日：2000-10-03
申请号：JP34416999
申请日：1999-12-03
Applicant: TORAY INDUSTRIES
Inventor： SUEOKA MASANORI , TSUKUDA AKIMITSU , HORIUCHI MITSUHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain an aromatic polyamide film having a low cost and excellent extensibility, developing a high Young's modulus in high drawing. SOLUTION: This film comprises an aromatic polyamide and at least one different polymer and has >=10 wt.% and
-
Patent Agency Ranking
公开(公告)号：JPH11152353A
公开(公告)日：1999-06-08
申请号：JP31876897
申请日：1997-11-19
Applicant: TORAY INDUSTRIES
Inventor： HORIUCHI MITSUHIRO , TSUKUDA AKIMITSU , SUEOKA MASANORI
Abstract: PROBLEM TO BE SOLVED: To provide a film which, in the form of a magnetic recording medium, has good electromagnetic conversion characteristics and durability. SOLUTION: This aromatic polyamide film comprises an arom. polyamide and at least one different kind of polymer, wherein the content of the polymer is 10 to 40 wt.% based on the arom. polyamide, the solubility parameter δa of the arom. polyamide and the solubility parameter δb of the dissimilar polymer meet the equation: 50 (MJ/m ) ) |δa-δb| ) , and, on at least one side of the film, the number of protrusions having a height of not less than 5 nm is 3×10 to 50×10 /mm , the number of protrusions having a height of not less than 50 nm is not more than 25×10 /mm , and the sectional area of protrusions cut on a horizontal plane at a height of 5 nm is 5 to 40% of the measured area.
-
公开(公告)号：JPH10114038A
公开(公告)日：1998-05-06
申请号：JP22624397
申请日：1997-08-22
Applicant: TORAY INDUSTRIES
Inventor： TSUKUDA AKIMITSU , HORIUCHI MITSUHIRO , CHIKUGI TOSHIHIRO
IPC: C08J5/18 , B29C55/12 , B29K77/00 , B29K105/16 , B29L7/00 , B32B27/34 , C08K3/00 , C08K5/00 , C08K9/04 , C08L77/10 , C09D201/00 , G11B5/62 , G11B5/64 , G11B5/73 , G11B5/733 , H05K1/03 , G11B5/704
Abstract: PROBLEM TO BE SOLVED: To obtain a film which is good at surface smoothness and traveling properties and especially suitable for a magnetic recording medium by using an aromatic polyamide film which indicates specified values of root mean square roughness and at least of one side and of maximum height. SOLUTION: In an aromatic polyamide film which is used preferably for a high density magnetic recording medium, a film of 2.0nm or more root mean square roughness at least of one side and of 100nm or less maximum height is used. One in which on its surface, the number of projections of at least 5nm height is 10 -10 /mm , and at least 30% of the projections is formed from inorganic particles is used. Inorganic and/or organic particles are made to be contained in the film. As the aromatic polyamide which constitutes a base material aromatic polyamide film, para-oriented aromatic polyamide is used, and one in which an aromatic nucleus occupies at least 30% of the total is used in part of hydrogen atoms in the aromatic nucleus in a structural unit.
-
公开(公告)号：JPH09100118A
公开(公告)日：1997-04-15
申请号：JP25520595
申请日：1995-10-02
Applicant: TORAY INDUSTRIES
Inventor： HORIUCHI MITSUHIRO , TSUKUDA AKIMITSU , ITO NOBUAKI
IPC: C01D15/08
Abstract: PROBLEM TO BE SOLVED: To obtain a lithium carbonate particle having small particle diameters, uniformity and a small amount of impurities by reacting an aqueous solution of lithium with an aqueous solution of a carbonate compound and/or carbonic acid while stirring so as to make Reynolds number within a specific range. SOLUTION: A reactor equipped with a stirring blade in a cylindrical container is charged with an aqueous solution of lithium. The aqueous solution of lithium is reacted with an aqueous solution of a carbonate compound and/or carbonic acid of 0.4-0.9 the number of mols of lithium at 40-90 deg.C while stirring so as to make a Reynolds number 10 to 10 . A formed hydrated lithium carbonate particle is separated and dried to give the objective lithium carbonate particle. The collected lithium carbonate particle has 1-200μm average particle diameter, =250μm particle diameter, =0.5μm particle diameter, >=50% of a particle having 1-100μm particle diameter, the maximum peak of a particle diameter distribution within the range of 1-80μm and >=25% frequency of the maximum peak.
-
公开(公告)号：JPH08287447A
公开(公告)日：1996-11-01
申请号：JP9281995
申请日：1995-04-18
Applicant: TORAY INDUSTRIES
Inventor： HORIUCHI MITSUHIRO , TSUKUDA AKIMITSU , UEDA TOMOAKI
Abstract: PURPOSE: To obtain a base film for magnetic recording medium having superior heat resistance, mechanical characteristics, smoothness, running performance and wear resistance and giving a magnetic recording medium excellent electromagnetic transducing characteristics, running performance and durability. CONSTITUTION: This base film is made of arom. polyamide or arom. polyimide, the contact angle of at least one side of the base film to water is >=50 deg. and the center line average roughness of the front side of this base film is 0.5-100nm.
-
公开(公告)号：JPH08235568A
公开(公告)日：1996-09-13
申请号：JP3991495
申请日：1995-02-28
Applicant: TORAY INDUSTRIES
Inventor： HORIUCHI MITSUHIRO , TSUKUDA AKIMITSU , UEDA TOMOAKI
Abstract: PURPOSE: To provide a film having satisfactory smoothness, running performance, heat resistance and durability and excellent in electromagnetic transducing characteristics. CONSTITUTION: A magnetic layer is formed on one side of a substrate film of arom. polyamide or arom. polyimide to obtain the objective magnetic recording medium. The center line average roughness of the surface of the substrate film on the magnetic layer side is 0.5-100nm, the number of coarse protrusions on the surface of the substrate film on the magnetic layer side is
-
-
-
-
-
-
-
-
Search Results
39
records
(took 0.03 seconds)
