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21. 发明专利

JPS61179721A ORIENTED POLYESTER FILM 失效
公开(公告)号：JPS61179721A
公开(公告)日：1986-08-12
申请号：JP2057185
申请日：1985-02-05
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： NISHINO YASUHIRO , MATSUYAMA YUJIRO , KUZE KATSURO , MAEDA KOZO , MAKIMURA OSAMU
IPC分类号： B29C55/02 , B29K67/00 , B29L7/00 , C08J5/18
摘要： PURPOSE:To offer a base film for a magnetic tape whose surface is smooth and is superior in slip properties, water resistance, durability and running properties and generation of defect such as drop out is few, by a method wherein a specific quantity of silica and/or titanium oxide having a specific particle diameter and a specific quantity of calcium carbonate particles having a specific particle diameter are loaded within polyester. CONSTITUTION:Polyester, which is obtained by loading 0.01-0.5wt% particles of one kind selected out of silica and titanium oxide whose mean particle diameter falls within a range of more than 0.01mum and less than 0.2mum and 0.01-0.3wt% calcium carbonate particles whose mean particle diameter falls within a range of more than 0.1mum and less than 0.5mum, is made into a film through stretching after the same has been melted and extruded. As for the obtained film, any of characteristics out of surface smoothness, slip properties, wear resistance, the number of coarse particles, durability and running properties have been extremely favorable and high-quality. In addition to the above, as for a loading method of finely divided particles into the polyester, although it can be performed at arbitrary stage in a manufacturing process of the polyester, it is desirable especially to load the same by completion time of initial condensation.

22. 发明专利

JPS61177227A ORIENTATED POLYESTER FILM 失效
公开(公告)号：JPS61177227A
公开(公告)日：1986-08-08
申请号：JP1948185
申请日：1985-02-04
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： NISHINO YASUHIRO , MATSUYAMA YUJIRO , KOBAYASHI MASAHIRO , OKUDAIRA TADASHI , MAKIMURA OSAMU
IPC分类号： B29C55/02 , B29K67/00 , B29L7/00 , C08J5/18
摘要： PURPOSE:To improve the electromagnetic conversion characteristics and running characteristics in oriented polyester film employed as substrate of video tapes such as metallization type tapes, vacuum evaporation type tapes and the like by a method wherein specified particles of silica or titanium oxide and specified particles of calcium carbonate are employed in polyester. CONSTITUTION:Polyester, in which 0.01-0.5wt% of particles of either silica or titanium oxide with a mean particle size of 0.01-0.1mum and 0.005-0.3wt% of particles of calcium carbonate with a mean particle size of 0.01-0.1mum are contained, is orientated. Crystalline polyester such as polyethylene terephthalate, polyalkylene naphthalate or the like is employed as the polyester. Especially polyethylene terephthalate is preferable. The resultant film has excellent electromagnetic conversion characteristics for video tapes, the surface smoothness of which is requested, such as metallization type tapes, vacuum evaporation type tapes and the like and at the same time has favorable slipperiness, wear resistance and a durable running property. In addition, extremely few coarse particles, which cause to occur drop outs, are produced.

23. 发明专利

JPS6088029A PRODUCTION OF INTERNAL PARTICLE-CONTAINING POLYESTER 失效
公开(公告)号：JPS6088029A
公开(公告)日：1985-05-17
申请号：JP19660583
申请日：1983-10-19
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： KUZE KATSUROU , MATSUYAMA YUUJIROU , OGINO YOSHIAKI , NAKAMURA KOUICHIROU , MAKIMURA OSAMU
IPC分类号： C08L67/02 , C08G63/00 , C08G63/78 , C08K3/00 , C08K5/00 , C08L67/00 , C08L69/00
摘要： PURPOSE:To produce the titled polyester low in a fish eye content caused by internal particles, by precipitating fine insoluble particles at a high concentration in the polymer during the production of the polyester. CONSTITUTION:A dicarboxylic acid component based on terephthalic acid or an esterifiable derivative thereof is reacted with a glycol component based on ethylene glycol. When the transesterification reaction or the esterification reaction is completed, an ethylene glycol solution of 30-500ppm (in terms of metal atom), based on formed polyester, of at least one insoluble precipitated particle-forming component selected from the group consisting of alkali (alkaline earth) metal compounds, Mn compounds, Zn compounds, Zr compounds, and P compounds is sprayed uniformly over the entire reaction system, and the reaction is brought to completion.

24. 发明专利

JPH06262674A ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH06262674A
公开(公告)日：1994-09-20
申请号：JP29621893
申请日：1993-11-26
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： NISHINO YASUHIRO , KUZE KATSURO , MATSUYAMA YUJIRO , MAKIMURA OSAMU
IPC分类号： B29C55/02 , B29K67/00 , B29L7/00 , C08J5/18
摘要： PURPOSE:To provide an oriented polyester film excellent in easy lubricating properties and durable running properties, reduced in the number of coarse projections and electromagnetic conversion characteristics after the formation of a magnetic tape. CONSTITUTION:In an oriented polyester film of which at least the single surface is-roughened is characterized by that the three-dimensional surface roughness index of the rough surface of the film is within the range simultaneously satisfying a formula I 0.0096

25. 发明专利

JPH06126918A TRANSLUCENT LAMINATION LAYER POLYESTER FILM 失效
公开(公告)号：JPH06126918A
公开(公告)日：1994-05-10
申请号：JP30760192
申请日：1992-10-20
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： MATSUMOTO HARUO , TATSUTA HIDEAKI , KONAGAYA JUJI
IPC分类号： B29C47/06 , B29C55/12 , B29K67/00 , B29L7/00 , B29L9/00 , B32B27/20 , B32B27/36 , C08L67/00 , G11B5/73 , G11B5/733 , G11B5/704
摘要： PURPOSE:To produce a translucent lamination layer polyester film economically while excellent tape characteristic are being provided by having a light transmittance and a color tone as specific values by a method wherein at least two kinds of inert inorganic particles containing titanium dioxide are contained in a layer containing a sunproofing agent. CONSTITUTION:A translucent lamination layer polyester film (a base film) is, at least, a laminated film by laminating a layer (a sunproofing layer) giving a sunproofing property which contains two or more kinds of inert inorganic particles containing titanium dioxide and a layer (an upper layer) which contains the inert particle and makes the titanium dioxide nonmandatory. It suffices for the purpose that total sunproofing property of a magnetic layer and a back coat layer which are applied onto both sides of the base film is only a required standard or over. Therefore, a light transmission property at 900nm of the base film is 10-60%, and a color tone measured with a color difference meter is at least 60 in an L value. As a means for making the L value at least 60, at least one agent of titanium dioxide and the inert inorganic particles which are large in the L value under a powdery state is selected for the sunproofing layer, and an appropriate quantity thereof is contained in the film.

26. 发明专利

JPH06126831A POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH06126831A
公开(公告)日：1994-05-10
申请号：JP30816492
申请日：1992-10-21
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： NISHINO YASUHIRO , KONAGAYA JUJI
IPC分类号： B29C55/12 , B29K67/00 , B29L7/00 , C08J5/18 , C08K3/00 , C08K3/26 , C08L67/00 , C08L67/02 , G11B5/73 , G11B5/733 , G11B5/704
摘要： PURPOSE:To provide a polyester film for a magnetic recording medium which is excellent in a flat easy slidableness, traveling-durability, chipping resistance, and scratch resistance. CONSTITUTION:0.05-2.0wt.% of synthetic calcium carbonate of 0.3-1.5mum in mean particle size and 0.05-2.0wt.% of a highly conductive par-ticulate which is at least 0.01cal/cm.sec. deg.C in thermal conductivity and under 10 pieces/mm in projection formability, are contained.

27. 发明专利

JPH0673273A PREPARATION OF POLYESTER COMPOSITION 失效
公开(公告)号：JPH0673273A
公开(公告)日：1994-03-15
申请号：JP22618892
申请日：1992-08-25
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： DOI TOSHIAKI , KONAGAYA JUJI
IPC分类号： C08J5/18 , C08K3/24 , C08K3/32 , C08K5/521 , C08L67/00 , C08L67/02
摘要： PURPOSE:To obtain a composition with controlled agglomeration of the fine particles, by adding a specified additive under specified conditions when the composition is made by mixing a polyester with fine inorganic or organic particles. CONSTITUTION:When this composition is made by incorporating fine inorganic or organic particles (e.g. CaCO3 particles) having a mean particle diameter of 0.01-5.0mum into a polyester consisting of a difunctional acid component composed mainly of an aromatic dicarboxylic acid and at least one glycol component (e.g. polyethylene terephthalate), at least one salt selected from, among an (alkaline earth) metal salt and an ammonium salt and at least one phosphorus compound selected from among phosphoric acid and its esters are added at the same time or in order before the fine particles are incorporated so that the amounts of the former and latter additives satisfy the relations of formulas I and II [wherein M , M and N are the total numbers of moles of alkali metal ions, alkaline earth metal ions and ammonium ions, respectively per 10 g of polyester; and P1 and P2 are similarly the total numbers of moles of phosphoric acid and a phosphoric ester, respectively].

28. 发明专利

JPH0665403A BIAXIALLY ORIENTED POLYESTER FILM 失效
公开(公告)号：JPH0665403A
公开(公告)日：1994-03-08
申请号：JP20405892
申请日：1992-07-30
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： KONAGAYA JUJI , OHASHI HIDETO , NISHINO YASUHIRO
IPC分类号： B29C55/12 , B29K67/00 , B29L7/00 , C08J5/18 , C08K3/20 , C08L67/00 , G11B5/73 , G11B5/733 , G11B5/704
摘要： PURPOSE:To provide the subject film excellent in resistance to wear and scratch. CONSTITUTION:The objective film consisting mainly of a polyester is made up of acid component predominant in an aromatic dicarboxylic acid and at least one kind of glycol component, and contains 100-20000ppm of multiple oxide particles containing 20-80wt.% alumina and 0.01-5wt.% chlorine ions and having 0.01-0.5mum mean particle diameter.

29. 发明专利

JPH0664121A BIAXIALLY-ORIENTED POLYESTER FILM HAVING EXCELLENT ABRASION RESISTANCE 失效
公开(公告)号：JPH0664121A
公开(公告)日：1994-03-08
申请号：JP21523992
申请日：1992-08-12
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： SASAKI YASUSHI , SUZUKI TOSHITAKE
IPC分类号： B29C55/12 , B29K67/00 , B29L9/00 , B32B27/20 , B32B27/36
摘要： PURPOSE:To provide a polyester film also having excellent abrasion resistance while making travelling and flatness coexist by forming a large number of projections based on fine particles onto the surface of the polyester film. CONSTITUTION:A large number of projections based on fine particles are formed onto at least one surface of a biaxially-oriented polyester film, and surface roughness at a time when a section, where there is no projection based on fine particles in said film surface, is measured by an interatomic power microscope is 0.2-2nm on an average.

30. 发明专利

JPH05301977A 失效
公开(公告)号：JPH05301977A
公开(公告)日：1993-11-16
申请号：JP26723391
申请日：1991-09-17
申请人： TOYO BOSEKI , NIPPON MAGPHANE KK
发明人： KUZE KATSURO , MATSUYAMA YUJIRO , MAEDA KOZO , KOBAYASHI MASAHIRO , HONGO TAKESHI , MAKIMURA OSAMU
IPC分类号： B29C55/02 , B29K67/00 , B29L7/00 , C08G63/78 , C08G63/82 , C08J5/18 , C08K3/26 , C08K3/36 , C08L67/00 , C08L67/02
摘要： PURPOSE:To obtain an oriented polyester film excellent in smoothness, sliding property and abrasion resistance. CONSTITUTION:The objective oriented polyester film has 0.08-pi/6 volume shape factor in at least one kind of particles in silica particles and calcium carbonate particles and contains 0.01-1wt.% silica particles having 0.01-0.5mum average particle diameter and 0.02-1.0wt.% calcium carbonate particles having >=0.01mum and

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