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71. 发明专利

JPH04282225A PREPARATION OF ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH04282225A
公开(公告)日：1992-10-07
申请号：JP4678991
申请日：1991-03-12
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： SHIRAE TERUKI , OKUDAIRA TADASHI
IPC分类号： B29C55/04 , B29C55/06 , B29K67/00 , B29L7/00
摘要： PURPOSE:To prevent the breakage of a film by suppressing the advance of thermal crystallization at the time of longitudinal stretching and to enhance stretching magnification in a longitudinal direction. CONSTITUTION:A polyester composition is supplied to a cooling roll while held to temp. higher than its softening point. The cooled and solidified sheet is passed between the gaps of a plurality of rolls to be stretched in its longitudinal direction by the speed difference between a plurality of the rolls. Heating means 3a, 3b, 3c are arranged to the stretching section of the sheet. The temps. of the heating means 3a, 3b, 3c are set so that the temp. on the side of the moving direction of the sheet becomes higher than the temp. on this side of the moving direction of the sheet. Since the quantity of the heat applied to the sheet at the time of stretching successively increases, the thermal crystallization of a film can be suppressed at the initial stage of stretching.

72. 发明专利

JPH04257418A BIAXIALLY ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH04257418A
公开(公告)日：1992-09-11
申请号：JP3908491
申请日：1991-02-08
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： INOUE TAKANARI , ODA NAONOBU , OKUDAIRA TADASHI
IPC分类号： B29C55/12 , B29K67/00 , B29L7/00 , C08J5/18
摘要： PURPOSE:To obtain high strength biaxially oriented polyester having excellent heat shrinkage characteristics in the temperature range near 70 deg.C by a method wherein the polyester concerned has the tensile stress at 5% elongation in longitudinal direction of 15kg/mm or more and satisfies the specified relationship between the ratio of absorption intensity at the peaks of infrared rays having wavenumbers of 975cm and 795cm and the specific gravity of it. CONSTITUTION:Unoriented polyester is biaxially oriented at the temperature higher than its glass transition temperature and, after being subjected to heat setting treatment, subjected to relaxation heat treatment in order to obtain biaxially oriented polyester film. The characteristics of the obtained film is the stress per unit crosssectional area of a sample at 5% elongation in tensile test in longitudinal direction of 15kg/mm or more and the value C of 56.50 or more in the formula C=43.4A-B, in which A is the specific gravity of the polyester and B is the ratio of absorption intensity of infrared rays having their wavenumbers of 975cm and 795cm . Thus, high strength film having excellent heat shrinkage characteristics in the temperature range near 70 deg.C is obtained.

73. 发明专利

JPH04147424A POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH04147424A
公开(公告)日：1992-05-20
申请号：JP27380790
申请日：1990-10-11
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： TATSUTA HIDEAKI , HARA ATSUSHI , MATSUMOTO HARUO
IPC分类号： B32B27/36 , B32B27/40 , B32B33/00 , C08L67/02 , G11B5/73
摘要： PURPOSE:To improve adhesion property of a magnetic coating film and back coating film, and surface smoothness by forming a specified coating layer comprising polyester urethane resin on a polyester film. CONSTITUTION:At least one surface of a base film comprising polyester resin is coated with a polyester polyurethane polymer which can be dispersed in water but insoluble in water. This polymer is obtained from a source component containing a polyol component containing at least polyester polyol and a polyisocyanate component. This polymer gives rough projections by when formed into a film. Thereby, the film causes no problem such as blocking, and shows excellent adhesion property with a magnetic coating film and a back coating film.

74. 发明专利

JPH04146955A ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH04146955A
公开(公告)日：1992-05-20
申请号：JP27140990
申请日：1990-10-08
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： KONAGAYA JUJI , NISHINO YASUHIRO , OHASHI HIDETO
IPC分类号： C08J5/18 , C08J7/04 , C08L25/06 , C08L67/00 , C08L67/02
摘要： PURPOSE:To provide an oriented polyester film contg. few coarse particles and having an excellent formability and a long traveling life by compounding a polyester resin with a specified amt. of fine particles of a specific cross-linked IPN polymer and forming the resulting compsn. into a film. CONSTITUTION:A copolymer of a polymerizable monomer (e.g. acrylic acid) with at least 5wt.% (based on the total monomer) at least one cross-linkable polyvinyl compd. (e.g. divinylbenzene) is compounded with 1-40wt.% hydrophilic polymer not reactive with the copolymer (e.g. polyacrylic acid) to form an interpenetrating network structure, thus giving fine particles of a cross-linked IPN polymer having a mean diameter of 0.01-5mum. A polyester resin (e.g. polyethylene terephthalate) is compounded with 0.001-5wt.% the particles and formed into a film, which is used for producing an oriented polyester film suitable for a magnetic tape, etc.

75. 发明专利

JPH041235A BIAXIALLY ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH041235A
公开(公告)日：1992-01-06
申请号：JP10146090
申请日：1990-04-17
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： MATSUMOTO HARUO , MURASHIGE RYUICHI , OHASHI HIDETO , KUZE KATSURO
IPC分类号： C08J5/18 , B29C55/12 , B29K67/00 , B29L7/00 , C08K3/22 , C08K7/16 , C08K9/04 , C08L67/00 , C08L67/02
摘要： PURPOSE:To obtain a biaxially oriented film which is smooth and highly excellent in abrasion resistance and slidability by adding an aggregated aluminum oxide having a specified primary particle diameter and a specified secondary particle diameter to a biaxially oriented polyester film. CONSTITUTION:A biaxially oriented polyester film containing 0.01-2wt.% aggregated aluminum oxide having a primary particle diameter of 0.1mum or below and a secondary particle diameter of 0.1-3mum. Desirably, the film wherein the aggregated aluminum oxide comprises at least 80wt.% aggregated aluminum oxide having a gamma-crystal structure. More desirably, the film wherein the aggregated aluminum oxide is treated with 0.1-5wt.%, based on the aggregated aluminum oxide, compound of the formula and/or copolymer thereof and/or their mixture. In the formula, X is H or 1-3C alkyl; Y is a carboxylic acid and/or its salt or ester; and n is selected so that the mol.wt. may fall in the range of 2000-100000.

76. 发明专利

JPH03281634A BIAXIALLY ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH03281634A
公开(公告)日：1991-12-12
申请号：JP8684890
申请日：1990-03-30
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： SASAKI YASUSHI , OKUDAIRA TADASHI , KUZE KATSURO
IPC分类号： C08J5/18 , B29C55/12 , B29K67/00 , B29L7/00 , C08L67/02 , G11B5/73 , G11B5/733
摘要： PURPOSE:To produce the title film improved in surface smoothness and handling properties in high speed working by specifying the coefficient of static friction, 10-point average roughness, protrusion height and air escape speed between two films. CONSTITUTION:A lubricant is obtained by mixing 0.05 0.5wt.% inert particles having a mean particle diameter (D1) of 0.05-0.3mum, a dispersion of particle diameter of 25% or below and an areal ratio to a circumscribed circle, defined by the equation of 60% or above with 0.005-0.1wt.% inert particles having a mean particle diameter (D2) of 0.2-0.5mum, desirably having a D2/D1 ratio of 1.2 or above, having a dispersion of particle diameters of 25% or below and the above defined areal ratio of 60% or above and other inert particles. A polyester is mixed with the lubricant B, and the mixture is molded into a film. This film is biaxially oriented to obtain the title film which has fine protrusions on the surface, has a coefficient of static friction of below 2.0, a 10-point average roughness (noncontact three-dimensional roughness meter) of 0.4-0.7mum, has below 2000/mm protrusion of a height of 0.2mum or above and 20000/mm or above protrusions of a height of 0.025-0.2mum and has an air escape speed between two films of 700sec or below.

77. 发明专利

JPH03253341A LAMINATED POLYESTER FILM 失效
公开(公告)号：JPH03253341A
公开(公告)日：1991-11-12
申请号：JP5242590
申请日：1990-03-02
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： TATSUTA HIDEAKI , MATSUMOTO HARUO , KUZE KATSURO
IPC分类号： B32B27/36 , B32B33/00 , C08L67/02 , G11B5/73
摘要： PURPOSE:To provide good travelling properties, winding properties and electromagnetic conversion properties of a film when used as a base film for magnetic recording medium by forming crater-shaped projections of given diameter on a surface layer. CONSTITUTION:A polymer compound is dissolved or dispersed in a solvent to manufacture a coating solution. Then, said coating solution is applied on the surface of a base film and dried thereon, and if necessary, said film is oriented in the monoaxial or biaxial direction. After that, a polymer compound is crystallized by heat treating, and a surface 2 with crater-shaped projections is formed on a base film 1. A laminated polyester film thus manufactured is provided with the diameter 3a of the crater-shaped projections 3 in the range of 0.5-10mum, and height 3b in the range of 0.001-0.5mum, and is formed on the film with density of (1X10 )-(2X10 /mm ). Its surface is comparatively flat because of said formation and high slip properties are provided.

78. 发明专利

JPH03211034A MANUFACTURE FOR BIAXIALLY ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH03211034A
公开(公告)日：1991-09-13
申请号：JP924590
申请日：1990-01-17
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： INOUE TAKANARI , ODA TAKANOBU , OKUDAIRA TADASHI
IPC分类号： B29C55/12 , B29C55/14 , B29K67/00 , B29L7/00
摘要： PURPOSE:To obtain a biaxially oriented polyester film whose strength of a longitudinal direction, that is, a running direction is high, by a method wherein a range of a refractive index after longitudinal orientation and lateral orientation is specified. CONSTITUTION:Polyethylene terephthalate raw materials are melt-extruded with, for example, a normal method, cooled, solidified and an unoriented film is obtained. Then the film is oriented laterally so that a lateral and thicknesswise refractive indexes nY, nZ satisfy a formula. Then longitudinal orientation is performed so that a mean refractive index n shown by the formula satisfies the formula. It is further preferable if the mean refractive index is at least 1.593. The film obtained like this may be oriented longitudinally at need. When the biaxially oriented film obtained like this is heat-treated at 190-240 deg.C, longitudinal strength is increased.

79. 发明专利

JPH03190719A MANUFACTURE OF BIAXIALLY ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH03190719A
公开(公告)日：1991-08-20
申请号：JP33336389
申请日：1989-12-21
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： ODA TAKANOBU , INOUE TAKANARI , OKUDAIRA TADASHI
IPC分类号： C08J5/18 , B29C55/14 , B29K67/00 , B29L7/00 , C08L67/00
摘要： PURPOSE:To obtain dimensional stability and strength capable of corresponding to the improvement of the performance of a magnetic tape by stretching a biaxially oriented film having specific tensile strength and density in the longitudinal direction on specified extension respectively in the longitudinal direction at a specified temperature and in the lateral direction at the specified temperature respectively. CONSTITUTION:A biaxially oriented polyester film having tensile strength of 13kg/mm or more and density of 1.380-1.400g/cm or more at the time of 5% extension in the longitudinal direction is oriented in the longitudinal direction at 150-230 deg.C. The film is stretched in the lateral direction at 180-230 deg.C, thus manufacturing a biaxially oriented film. Polyester containing alkylene terephthalate, etc., as a polymerization unit is used as the polyester. According to the constitution, dimensional stability and strength in the longitudinal and lateral directions capable of corresponding to the improvement of the performance of a magnetic tape can be acquired.

80. 发明专利

JPH03162422A PRODUCTION OF POLYESTER FILM 失效
公开(公告)号：JPH03162422A
公开(公告)日：1991-07-12
申请号：JP30120489
申请日：1989-11-20
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： KUZE KATSURO , MATSUMOTO HARUO , NISHINO YASUHIRO
IPC分类号： C08J5/18 , C08K7/16 , C08L67/00 , C08L67/02
摘要： PURPOSE:To inexpensively obtain the title film having excellent slipperiness and a small number of coarse protrusions by adding inactive inorganic particles to satisfy a specific condition in a polyester resin and diluting a master polyester resin. CONSTITUTION:In diluting (A) a mater polyester resin containing 1.0-50wt.% inactive inorganic particles having 0.005-5mum average particle diameter with (B) a polyester resin to produce a polyester film containing 0.05-3.0wt.% inactive inorganic particles in the component A, inert inorganic particles satisfying DB/DA

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