公开(公告)号：JPH0270727A

公开(公告)日：1990-03-09

申请号：JP22304788

申请日：1988-09-06

Applicant: TORAY INDUSTRIES

Inventor： ABE KOICHI ,  OKAZAKI IWAO ,  NAKAJIMA SHOJI

IPC: B41M5/382 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B41M5/40 ,  B41M5/50 ,  B41M5/52 ,  C08J5/18 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733

Abstract: PURPOSE:To improve scratch resistance by specifying the distribution of the concn. of inert particles in a film consisting mainly of a thermoplastic resin and the inert particles. CONSTITUTION:A pelletized thermoplastic resin contg. a specified amt. of inert particles with a degree of vacuum of not more than 1.6 is extruded into a sheet and set by cooling to give an unstretched film, which is stretched in the longitudinal direction at a temp. within the range of from 10 deg.C lower to 10 deg.C higher than the glass transition paint of the resin at a stretching rate of 1,000-10,000%/min, and then stretched in the transverse direction at a relative humidity of 50% and a temp. within the range of from 10 deg.C lower to 30 deg.C higher than the glass transition paint at the stretching rate of 1,000-20,000%/min to give a biaxially oriented thermoplastic resin film wherein a depth (a distance from the surface), A nm, at a point where the particle concn. is one tenth of that at the surface and a depth, B nm, at a point (B>A) where the particle concn. is the same as that at the surface satisfy relations I and II in a distribution curve of the particle concn. measured from at least one surface of the film to a point of 3,000nm deep.

公开(公告)号：JPH0249219A

公开(公告)日：1990-02-19

申请号：JP19929188

申请日：1988-08-09

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  ABE KOICHI ,  OKAZAKI IWAO

IPC: G11B5/78 ,  C08L67/02 ,  G11B5/73

Abstract: PURPOSE:To prevent the generation of white powder and to improve wear resistance and winding characteristics by forming projections having a specific number of projections and specific height on the nonmagnetic surface of a film essentially consisting of a compsn. composed of polyester and inert particles. CONSTITUTION:A magnetic coating layer is provided on one surface of the film essentially consisting of the compsn. composed of the polyester and the inert particles. The nonmagnetic surface of this tape is so formed that the number of the projections having =6,000pieces/mm , the average height value (h) of the projections 50-150nm, the ratio sigma/h between the average value h and the standard deviation sigma of the projection height

公开(公告)号：JPH01299833A

公开(公告)日：1989-12-04

申请号：JP13083688

申请日：1988-05-27

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  ABE KOICHI ,  NAKAJIMA SHOJI

IPC: B29C55/12 ,  B29K67/00 ,  B29K105/16 ,  B29L7/00 ,  C08J5/18 ,  C08K3/26 ,  G11B5/73 ,  G11B5/733

Abstract: PURPOSE:To obtain a film which can exhibit excellent running performance and output characteristics even without any backcoat, by specifying the state of surface protrusions ascribable to particles of a biaxially oriented polyester film containing two kinds of fine silica particles of different mean particle diameters. CONSTITUTION:This biaxially oriented polyester film is formed from a polyester containing two kinds of fine silica particles of different mean particles diameters, wherein the diameter of a film surface protrusion ascribable to particles is 0.5-8.0mum, the difference between the mean of the diameters of the protrusions and that of particles of a smaller diameter is 1.0mum or above, and the number of protrusions of a larger diameter is 5000/mm or smaller, and the number of protrusions of a smaller diameter is 15000/mm or larger. It is desirable that the means particle diameter of the particles of a smaller diameter is 0.03-0.5mum, and the mean particle diameter of particles of a larger diameter is 0.4-1.5mum, because the running performances of a tape prepared from the film are still better.

公开(公告)号：JPH01144425A

公开(公告)日：1989-06-06

申请号：JP30519887

申请日：1987-12-01

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  ABE KOICHI ,  NAKAJIMA SHOJI

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00

Abstract: PURPOSE:To obtain the title film giving excellent transportability and output characteristics when used as a magnetic recording medium and suitable for video tape, etc., without necessitating a back coat, by adding spherical silica to attain specific surface protrusion height, height distribution and protrusion spacings. CONSTITUTION:(A) A polyester such as polyethylene terephthalate is compound with (B) silica particles inert to the component A and composed of 0.3-0.8wt.% of small-diameter silica particles having an average particle diameter of e.g., 0.1-0.5mum and 0.001-0.05wt.% of large-diameter silica particles having an average particle diameter of 0.5-1.2mum. The obtained composition is biaxially oriented to obtain the objective film having minute protrusions on the surface, wherein the average height of the surface protrusions is 50-200nm, the standard deviation of the height of the protrusion is 60-250nm based on the part free from protrusion and the average spacing between protrusions of

公开(公告)号：JPH0196226A

公开(公告)日：1989-04-14

申请号：JP25546987

申请日：1987-10-08

Applicant: TORAY INDUSTRIES

Inventor： ABE KOICHI ,  NAKAJIMA SHOJI ,  OKAZAKI IWAO

IPC: C08J5/18 ,  B29C55/02 ,  B29K67/00 ,  B29L7/00 ,  C08K3/00 ,  C08L67/00 ,  C08L67/02

Abstract: PURPOSE:To obtain the titled film which reduced coefficient of friction without need of back coating, excellent in output characteristics when used as a magnetic recording medium, thus suitable for magnetic tapes, by incorporating a polyester with inert inorganic particles so that the surface roughness of the resulting film fall within a specified range. CONSTITUTION:(A) A polyester constituted mainly of ethylene terephthalate unit is incorporated with (B) pref. 0.3-1.5wt.% of inert inorganic particles (e.g. of synthetic calcium carbonate) to make into the objective biaxially oriented film. This film has the following characteristics: 1, depth Rp from the maximum peak to the centerline in the standard length section in the surface roughness curve 60-190nm, 2, ratio of Rp to the average surface roughness on the centerline 4-25, 3, average interval between asperities =0.08.

公开(公告)号：JPS63178142A

公开(公告)日：1988-07-22

申请号：JP819687

申请日：1987-01-19

Applicant: TORAY INDUSTRIES

Inventor： ITO KIYOHIKO ,  NAKAJIMA SHOJI ,  ABE KOICHI

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00

Abstract: PURPOSE:To obtain a polyester film which, when used as a magnetic recording medium, can show improved running property, especially, under high-humidity and high-temperature conditions without detriment to its electromagnetic transduction characteristics, by forming a biaxially oriented polyester film satisfying specified conditions concerning characteristic values. CONSTITUTION:A polyester film which is a biaxially oriented film based on a polyester and simultaneously satisfies the following equations: (1) 0.2

公开(公告)号：JPS6375028A

公开(公告)日：1988-04-05

申请号：JP22075886

申请日：1986-09-18

Applicant: TORAY INDUSTRIES

Inventor： ABE KOICHI ,  ITO KIYOHIKO ,  NAKAJIMA SHOJI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L17/00 ,  C08G63/18 ,  C08G63/181 ,  C08G63/78 ,  C08J5/18 ,  C08K3/20 ,  C08K3/26 ,  C08K3/36 ,  C08L67/00 ,  G11B5/73 ,  G11B5/733

Abstract: PURPOSE:To produce the titled film having both surface smoothness and running properties of magnetic tape, showing improved drop out even at high speed of calendering process, by adding plural inert inorganic particles having difference in crystallization promotion coefficient to a polyester. CONSTITUTION:(A) A polyester having a constituent unit shown by formula I (R is at least one dicarboxylic acid residue selected from groups shown by formula II - formula IV) as a main repeating unit is blended with (B) (i) 0.01-1.0wt% inert inorganic particles having 0.05-0.5mum average particle diameter and (ii) 0.01-0.5wt% (coefficient of crystallization promotion of the component is is >=2 deg.C higher than that of the component ii) inert inorganic particles having 0.5-2.5mum average particle diameter, undulation index of film is made 0.5-0.95 and the film is biaxially drawn and oriented to give the aimed film.

公开(公告)号：JPS6369643A

公开(公告)日：1988-03-29

申请号：JP21461786

申请日：1986-09-11

Applicant: TORAY INDUSTRIES

Inventor： NAKAJIMA SHOJI ,  ITO KIYOHIKO ,  ABE KOICHI

IPC: B32B27/36

公开(公告)号：JPS62267333A

公开(公告)日：1987-11-20

申请号：JP11068886

申请日：1986-05-16

Applicant: TORAY INDUSTRIES

Inventor： TSUNASHIMA KENJI ,  ITO KIYOHIKO ,  NAKAJIMA SHOJI

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08G63/18 ,  C08G63/78 ,  C08K3/36 ,  G11B5/73 ,  G11B5/733

Abstract: PURPOSE:To obtain a polyester film giving a magnetic tape free from drop-out and having excellent transportability, especially transportability and abrasion resistance under high temperature and humidity condition, by forming a film from a resin containing inorganic porous fine particles in a manner to attain a surface roughness, etc., falling within respective specific ranges. CONSTITUTION:A polyester film having a center-line average roughness Ra and average peak height Rms (determined from a cross-sectional roughness curve) satisfying the formulas Rms/Rs(0.025)=1.4-2.2 and Ra(0.80)/Ra(0.25)=1.5-3.0. The film can be produced by using porous particles having an average particle diameter of 0.6-2.0mum, preferably 0.8-1.5mum and a specific surface area of >=200m /g, preferably >=300 /g and adding the particles to a polyester film at an amount of 0.001-1wt%, preferably 0.002-0.5wt%.

公开(公告)号：JPS62252522A

公开(公告)日：1987-11-04

申请号：JP9472686

申请日：1986-04-25

Applicant: TORAY INDUSTRIES

Inventor： ABE KOICHI ,  ITO KIYOHIKO ,  NAKAJIMA SHOJI

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08L67/00 ,  G11B5/73 ,  G11B5/733

Abstract: PURPOSE:To obtain a base film which excels in both of an electromagnetic conversion characteristic and runnability by incorporating inert pulverized inorg. particles having a specific average grain size and grain size distribution into a specific polyester. CONSTITUTION:This base film is a biaxially oriented film essentially consisting of the polyester having the structural unit expressed by the formula I as a main repeating unit and the compsn. contg. 0.03-2.0wt% pulverized inorg. particles having 0.03-2.5mum average grain size. The volumetric fraction of the particles sized >=1.3 times the average grain size of the pulverized inorg. particles is 5-45% of the entire part and the average grain size in 5% (vol%) of the particles of the larger grain sizes is 1.3-10 times the average grain size of the entire particle. The base film for the magnetic recording medium having the excellent runnability is thus obtd. without spoiling the electromagnetic conversion characteristic.