公开(公告)号：JP2510741B2

公开(公告)日：1996-06-26

申请号：JP399990

申请日：1990-01-11

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  ABE KOICHI ,  NAKAJIMA SHOJI

IPC: B32B27/20 ,  B29C55/14 ,  B29K67/00 ,  B29L9/00 ,  B32B27/00 ,  B32B27/36 ,  C08J5/18

公开(公告)号：JPH07171932A

公开(公告)日：1995-07-11

申请号：JP23854594

申请日：1994-09-05

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  ABE KOICHI ,  OKAZAKI IWAO

IPC: B32B27/00 ,  B29C55/12 ,  B29K67/00 ,  B29K105/16 ,  B29L9/00 ,  B32B27/18 ,  B32B27/20 ,  B32B27/36 ,  G11B5/73 ,  G11B5/733 ,  G11B5/738 ,  G11B5/704

Abstract: PURPOSE:To provide the title film optimum corresponding to a use by further adding a separate layer to a specific laminated film. CONSTITUTION:A film A based on a thermoplastic resin A and particles is laminated to at least the single surface of a film B based on a thermoplastic resin B to obtain a biaxially oriented thermoplastic film wherein the average particle size of the particles contained in the film A is 0.1-10 times the thickness of the film A and the content thereof in the film A is 0.01- below 0.5wt.%. AC-layer composed of at least one layer selected from a discontinuous film (a) with a height of 10-1000Angstrom , a low crystalline resin layer (b) with a crystallizing parameter DELTATcg of 80 deg.C or higher and an antistatic resin layer (c) with surface resistance of 10 W/square or less is provided on at least the single surface of the film.

公开(公告)号：JPH071695A

公开(公告)日：1995-01-06

申请号：JP10326894

申请日：1994-04-19

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  TANAKA HIROYUKI ,  ABE KOICHI ,  OKAMOTO KATSUYA

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/36

Abstract: PURPOSE:To enhance the running properties and resistance to scratching of a film and obtain a good image quality in use for a magnetic recording medium by a method wherein a biaxially oriented film in use is obtained by laminating a layer mainly composed of a polyester A on one surface of a layer mainly composed of a polyester B. CONSTITUTION:In a biaxially oriented film obtained by laminating a layer A mainly composed of a polyester A on one surface of a layer B mainly composed of a polyester B, a center line average surface roughness difference DELTARa between both the surfaces of the film is not less than 0.005mum, 5X10 /mm or more projections are formed on the surface having a larger surface roughness Ra, and a projection/particle number ratio, i.e., a ratio of the number of projections to the number of particles contained in the layer A as a surface layer, is 5 or more. The kind of the polyester A is not particularly limited, but the crystallizing parameter DELTA Tcg of the polyester A is preferably 60 deg.C or lower.

公开(公告)号：JPH071575A

公开(公告)日：1995-01-06

申请号：JP10326494

申请日：1994-04-19

Applicant: TORAY INDUSTRIES

Inventor： OKAMOTO KATSUYA ,  ABE KOICHI ,  NAKAJIMA SHOJI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/36 ,  C08J5/18

Abstract: PURPOSE:To obtain a polyester film capable of forming surface projections hard to destruct and having relatively low hardness, capable of preventing the cutting of a partner member such as a guide while enhancing the surface abrasion resistance itself to a large extent and ideal for various industrial uses. CONSTITUTION:A polyester film is a biaxially oriented film based on polyester A and characterized by that the number of projections of at least one surface thereof is 5X10 /mm or more and the ratio (NR) of the number of projections/ the number of particles being the ratio of the number of projections and the number of the particles contained in the surface layer on the film is 5 or more.

公开(公告)号：JPH06325352A

公开(公告)日：1994-11-25

申请号：JP13402493

申请日：1993-05-11

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  ABE KOICHI ,  OKAMOTO KATSUYA

IPC: G11B5/66 ,  C08L67/00 ,  G11B5/73 ,  G11B5/704

Abstract: PURPOSE:To obtain excellent tracking durability and scratching resistance by forming a specified number or more of fine projections on the surface of a film. CONSTITUTION:At least, on one surface of a biaxially oriented polyester film essentially comprising polyester (A), fine projections are formed by the amt. of 5X10 number/mm by using crystallization of the polyester (A). The ratio of projection number/particle number (particles included in the surface layer which constitutes the surface) is specified to >=5 and Rt(center line average roughness)/Ra (max. height) is specified to

公开(公告)号：JPH06320616A

公开(公告)日：1994-11-22

申请号：JP11166293

申请日：1993-05-13

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  ABE KOICHI ,  OKAMOTO KATSUYA

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/36

Abstract: PURPOSE:To realize enhancement of projection strength and superior electromagnetic conversion characteristics. CONSTITUTION:In a biaxially oriented film mainly composed of a polyester A, part or all of the polyester A is made of a thermoplastic resin having a crystalline parameter DELTATcg higher than 70 deg.C, and a Rt/Ra ratio of Rt to a surface roughness Ra is 20 or less on at least one surface of the film.

公开(公告)号：JPH06320614A

公开(公告)日：1994-11-22

申请号：JP11165993

申请日：1993-05-13

Applicant: TORAY INDUSTRIES

Inventor： OKAMOTO KATSUYA ,  ABE KOICHI ,  NAKAJIMA SHOJI

IPC: B29C55/12 ,  B29K67/00 ,  B29L9/00 ,  B32B27/36

Abstract: PURPOSE:To obtain both a wear resistance and a dust generation inhibiting effect in running a plastic roll. CONSTITUTION:In a biaxially oriented film mainly composed of a polyester A, part or all of the polyester A has a crystalline parameter DELTATcg of 40 up to below 70 deg.C, and a Rt/Ra ratio of Rt to a surface roughness Ra is 20 or less.

公开(公告)号：JPH0616850A

公开(公告)日：1994-01-25

申请号：JP19921192

申请日：1992-07-01

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  ABE KOICHI ,  OKAZAKI IWAO

IPC: B29C55/12 ,  B29K105/16 ,  B29L9/00 ,  B32B27/20 ,  B32B27/30 ,  B32B27/36 ,  B32B33/00 ,  C04B28/04 ,  C08J7/04 ,  G11B5/73 ,  G11B5/738 ,  G11B5/704

Abstract: PURPOSE:To provide a biaxially oriented laminated film on the surface of which desired chipping-resistant protrusions are formed at good efficiency to impart thereto a desired surface profile and which can exhibit excellent windability, is excellent in dropout resistance as a magnetic medium, and has excellent adhesion to magnetic layer. CONSTITUTION:The film has an at least three-layer laminated structure prepared by coextrusion, contains particles in at least one of the outermost layers, satisfies the relationship: 0.2d -2X10 /mm protrusions on the surface or contains 3X10 -1.5X10 /mm particles having diameters satisfying the above relationship and having a coating layer based on a water-soluble or water-dispersible resin on at least either surface.

公开(公告)号：JPH05338023A

公开(公告)日：1993-12-21

申请号：JP17598892

申请日：1992-06-11

Applicant: TORAY INDUSTRIES

Inventor： ABE KOICHI ,  OKAMOTO KATSUYA ,  NAKAJIMA SHOJI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/20 ,  B32B27/36 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

Abstract: PURPOSE:To provide a biaxially oriented polyester film for a magnetic recording medium, which is hard to curl while securing an excellent picture quality (S/N) which may be obtained in the case where the film is made into the magnetic recording medium. CONSTITUTION:A biaxially oriented polyester film is obtained by laminating a polyester composition A containing particles on at least one side of a polyester composition B, a ratio t/d between a mean particle diameter (d) of the particles contained in the polyester A layer and a thickness (t) of the polyester A layer satisfies 0.1 /%RH and a difference between the coefficients of humid expansion of the lengthwise and widthwise directions is not exceeding 4X10 %RH.

公开(公告)号：JPH05318583A

公开(公告)日：1993-12-03

申请号：JP15005392

申请日：1992-05-19

Applicant: TORAY INDUSTRIES

Inventor： OKAMOTO KATSUYA ,  NAKAJIMA SHOJI ,  ABE KOICHI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/20 ,  B32B27/36 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

Abstract: PURPOSE:To improve traveling properties and cutting resistance, to reduce a decrease in picture quality and to improve skew characteristics of a biaxially oriented laminated film by forming the film in a laminated structure of three or more layers, incorporating special particles in an outermost layer of its one side surface, and simultaneously processing means such as enhancing intrinsic viscosity of the outermost layer part. CONSTITUTION:A biaxially oriented laminated film is formed of a laminated structure of at least three or more layers. In this case, particles are contained at least in an outermost layer of its one side surface of the film. The relationship between a mean particle size (d) (mum) of the particle and a thickness(t) of the outermost layer is so set as to satisfy 0.2d -2X10 mm . Further, intrinsic viscosity of an intermediate layer is set to higher than that of the outermost layer part. Thus, fine protrusions on the surface of the film are optimized to improve traveling properties and cutting resistance, a decrease in picture quality at the time of using it as a magnetic medium is reduced, and its skew characteristics are improved.