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公开(公告)号：DE69721617D1
公开(公告)日：2003-06-12
申请号：DE69721617
申请日：1997-02-27
Applicant: TORAY INDUSTRIES
Inventor： TSUZUKI TOSHIHIRO , SUEOKA MASANORI , ITOH NOBUAKI
Abstract: An aromatic polyamide and/or aromatic polyimide film suitable as a support in a magnetic recording medium excellent in runnability and scratch resistance and good in S/N ratio cowprises an aromatic polyamide and/or aromatic polyimide as a main component, with particles present in the film, which film has characteristics which satisfy the following formulae: or where dmax is the depth from a first surface of the film at which the particle density shows the first maximal value; dmin is the depth at which the particle density shows the first minimal or minimum value in a range from dmax to 1 mu m from the said first surface; the linear differential coefficient of the particle density distribution curve has an inflection point at which the quadratic differential coefficient of the particle density distribution curve is a negative, which inflection point occurs at a depth d", deeper than dmax, and within a range between the depth at which rho (d) is 4/5 of rho (dmax), and dmin; and rho (d) is the particle density at each depth.
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公开(公告)号：DE69721617T2
公开(公告)日：2004-02-26
申请号：DE69721617
申请日：1997-02-27
Applicant: TORAY INDUSTRIES
Inventor： TSUZUKI TOSHIHIRO , SUEOKA MASANORI , ITOH NOBUAKI
Abstract: An aromatic polyamide and/or aromatic polyimide film suitable as a support in a magnetic recording medium excellent in runnability and scratch resistance and good in S/N ratio cowprises an aromatic polyamide and/or aromatic polyimide as a main component, with particles present in the film, which film has characteristics which satisfy the following formulae: or where dmax is the depth from a first surface of the film at which the particle density shows the first maximal value; dmin is the depth at which the particle density shows the first minimal or minimum value in a range from dmax to 1 mu m from the said first surface; the linear differential coefficient of the particle density distribution curve has an inflection point at which the quadratic differential coefficient of the particle density distribution curve is a negative, which inflection point occurs at a depth d", deeper than dmax, and within a range between the depth at which rho (d) is 4/5 of rho (dmax), and dmin; and rho (d) is the particle density at each depth.
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公开(公告)号：DE3687988T2
公开(公告)日：1993-10-21
申请号：DE3687988
申请日：1986-10-09
Applicant: TORAY INDUSTRIES
Inventor： ITOH NOBUAKI , KOBAYASHI HIROAKI , MIZOUCHI MASANORI
Abstract: The aromatic polyamide film (1) contains 10-40 wt.% of carbon black and is specified as follows: thickness (t) = 1-10 micro.m, surface (electric) resistance (Rs) = Rs x t = above 2-100 kohms/square (better Rs x t = 3-7 kohms/square), strength in at least one direction = 8 Kg/square mm, dimensional change at 200 deg.C under a load of 1 Kg/square mm = up to 5%, the surface ratio of the carbon black lies between 5 square m/g and 1000 square m/g. The meaparticle size of the prim. particles of the carbon black is 10-100 micro.m. The one dimensional stretching coefft. of the polyamide film is 10% or more. The hydrate absorbance of the polyamide film is 4% or less. This medium is produced by an electrical heat-transfer process.
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Patent Agency Ranking
公开(公告)号：CA2198532A1
公开(公告)日：1997-08-27
申请号：CA2198532
申请日：1997-02-26
Applicant: TORAY INDUSTRIES
Inventor： ITOH NOBUAKI , SUEOKA MASANORI , TSUZUKI TOSHIHIRO
Abstract: An aromatic polyamide and/or aromatic polyimide film suitable as a support in a magnetic recording medium excellent in runnability and scratch resistance and good in S/N ratio comprises an aromatic polyamide and/or aromatic polyimide as a main component, with particles present in the film, which film has characteristics which satisfy the following formulae: 10nm 3 or 10nm 3 p(dmax) / p(dmin) >100 (5) where dmax is the depth from a first surface of the film at which the particle density shows the first maximal value; dmin is the depth at which the particle density shows the first minimal or minimum value in a range from dmax to 1 .mu.m from the said first surface; the linear differential coefficient of the particle density distribution curve has an inflection point at which the quadratic differential coefficient of the particle density distribution curve ia a negative, which inflection point occurs at a depth d", deeper than dmax, and within a range between the depth at which p(d) is 4/5 of p(dmax), and dmin; and p(d) is the particle density at each depth.
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公开(公告)号：DE3687988D1
公开(公告)日：1993-04-15
申请号：DE3687988
申请日：1986-10-09
Applicant: TORAY INDUSTRIES
Inventor： ITOH NOBUAKI , KOBAYASHI HIROAKI , MIZOUCHI MASANORI
Abstract: The aromatic polyamide film (1) contains 10-40 wt.% of carbon black and is specified as follows: thickness (t) = 1-10 micro.m, surface (electric) resistance (Rs) = Rs x t = above 2-100 kohms/square (better Rs x t = 3-7 kohms/square), strength in at least one direction = 8 Kg/square mm, dimensional change at 200 deg.C under a load of 1 Kg/square mm = up to 5%, the surface ratio of the carbon black lies between 5 square m/g and 1000 square m/g. The meaparticle size of the prim. particles of the carbon black is 10-100 micro.m. The one dimensional stretching coefft. of the polyamide film is 10% or more. The hydrate absorbance of the polyamide film is 4% or less. This medium is produced by an electrical heat-transfer process.
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公开(公告)号：DE3379923D1
公开(公告)日：1989-06-29
申请号：DE3379923
申请日：1983-02-25
Applicant: TORAY INDUSTRIES
Inventor： ASAKURA TOSHIYUKI , KOBAYASHI HIROAKI , ITOH NOBUAKI
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.
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公开(公告)号：EP0311684A4
公开(公告)日：1989-11-07
申请号：EP86905940
申请日：1986-10-09
Applicant: TORAY INDUSTRIES
Inventor： ITOH NOBUAKI , KOBAYASHI HIROAKI , MIZOUCHI MASANORI
CPC classification number: B41M5/3825 , Y10S428/913 , Y10S428/914 , Y10T428/25 , Y10T428/266 , Y10T428/31 , Y10T428/31725
Abstract: A transfer medium for heat-sensitive recording based on an electrical heat-transfer process. It comprises a transfer ink layer and a 1- to 10-mum thick aromatic polyamide film of at least 8 kg/mm2 in strength of at least one direction and not more than 5 % in dimensional change at 200°C under a load of 1 kg/mm2, containing 10 to 40 wt % of carbon black. This medium is heat-resistant, pinhole-resistant and thin, and makes it possible to conduct high-speed printing and to improve printing quality.
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8.发明公开Aromatic polyamide and/or aromatic polyimide film and magnetic recording medium having such a film as a base 失效芳香族聚酰胺薄膜和/或聚酰亚胺薄膜和磁记录介质具有这样的薄膜作为支撑
公开(公告)号：EP0793219A3
公开(公告)日：1998-07-15
申请号：EP97301315
申请日：1997-02-27
Applicant: TORAY INDUSTRIES
Inventor： TSUZUKI TOSHIHIRO , SUEOKA MASANORI , ITOH NOBUAKI
CPC classification number: C08J5/18 , C08J2377/10 , C08J2379/08 , G11B5/733 , Y10S428/90 , Y10T428/24355 , Y10T428/24372 , Y10T428/24992 , Y10T428/25 , Y10T428/265 , Y10T428/31725
Abstract: An aromatic polyamide and/or aromatic polyimide film suitable as a support in a magnetic recording medium excellent in runnability and scratch resistance and good in S/N ratio cowprises an aromatic polyamide and/or aromatic polyimide as a main component, with particles present in the film, which film has characteristics which satisfy the following formulae: or where dmax is the depth from a first surface of the film at which the particle density shows the first maximal value; dmin is the depth at which the particle density shows the first minimal or minimum value in a range from dmax to 1 mu m from the said first surface; the linear differential coefficient of the particle density distribution curve has an inflection point at which the quadratic differential coefficient of the particle density distribution curve is a negative, which inflection point occurs at a depth d", deeper than dmax, and within a range between the depth at which rho (d) is 4/5 of rho (dmax), and dmin; and rho (d) is the particle density at each depth.
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