公开(公告)号：JPH06106614A

公开(公告)日：1994-04-19

申请号：JP25447692

申请日：1992-09-24

Applicant: TORAY INDUSTRIES

Inventor： ABE KOICHI ,  NAKAJIMA SHOJI ,  MINAMIZAWA HIDEHITO

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/36 ,  B32B33/00 ,  C08J5/18 ,  C08J7/04 ,  C08L67/00 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

Abstract: PURPOSE:To manufacture a film with its surface not chipped off when the film travels at high speed in VTR by specifying the content of a dispersed polymer dispered in a dispersed layer, specifying the ratio between the thickness of the dispersed layer and the average particle diameter of the dispersed polymer component and also specifying the ratio of the total thickness of the dispersed layer occuping in the total film thickness. CONSTITUTION:The content of dispersed polymer dispersed in a dispersed layer is specified as 1-45wt.%, and the ratio t/d between the thickness (t) of dispersed layer and the average particle diameter (d) of dispersed polymer component satisfies the formula -0.1

公开(公告)号：JPH05305658A

公开(公告)日：1993-11-19

申请号：JP13450492

申请日：1992-04-28

Applicant: TORAY INDUSTRIES

Inventor： MINAMIZAWA HIDEHITO ,  OKAZAKI IWAO ,  ABE KOICHI

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

Abstract: PURPOSE:To obtrain an excellent S/N ratio, in a biaxially oriented laminated film having a laminated structure consisting of at least three or more layers, by adding particles having a specific particle size range with respect to the thickness of the outermost layer to the outermost layer at least on the single surface of the film and specifying the number of projections and heat shrinkage factor of the surface of the film. CONSTITUTION:In a biaxially oriented laminated film having a laminated structure consisting of at least three or more layers at least one of which is biaxially oriented, particles such as silica particles are added to the outermost layer at least on the single surface of the film. In this case, the relation of 0.2d -2X10 /mm and the heat shrinkage factor of the surface of the film is 1.5% or less. For example, the particles are added to a polyester film by polymerizing a slurry prepared by dispersing the particles in ethylene glycol with a dicarboxylic acid component.

公开(公告)号：JPH0584821A

公开(公告)日：1993-04-06

申请号：JP27344491

申请日：1991-09-26

Applicant: TORAY INDUSTRIES

Inventor： OKAZAKI IWAO ,  MINAMIZAWA HIDEHITO ,  ABE KOICHI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/20 ,  B32B27/36 ,  C08J7/04 ,  G11B5/73 ,  G11B5/733

Abstract: PURPOSE:To obtain excellent slipperiness, abrasion resistance and electromagnetic conversion characteristics by a method wherein non-round soft particles having low strength are included and, at the same time, highly dense surface projections having even height are formed. CONSTITUTION:The film concerned has the lamination structure consisting of two or more layers. At least one side outermost layer part contains particles, the particle diameter ratio of each of which is 1.1-10 and the strength of each of which under 10% deformation is 10kgf/mm or less. The relative standard deviation of the distribution of the height of the surface projections of the film due to the particle is 1.0 or less and the number of the projections is 5,000/mm or more.

公开(公告)号：JPH04294125A

公开(公告)日：1992-10-19

申请号：JP8297491

申请日：1991-03-25

Applicant: TORAY INDUSTRIES

Inventor： MINAMIZAWA HIDEHITO ,  OKAZAKI IWAO ,  ABE KOICHI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  B29L9/00 ,  B32B7/02 ,  B32B27/36 ,  C08L67/02 ,  G11B5/73

Abstract: PURPOSE:To improve electromagnetic converting characteristics without incorporating any particle and while excellent high speed grinding characteristics are exhibited by dispersing a liq. crystal polyester with extremely high affinity with a base material polyester in the outermost surface layer of the thin layer. CONSTITUTION:A liq. crystal polyester means a product which melts at a molding temp. of a base material polyester and is dispersed in a film in a spherical shape to act for forming surface projections in substituting for incorporated particles. As the loading ratio, it is necessary to incorporate 5-30 pts.wt. liq. crystal polyester to 70-99.5 pts.wt. thermoplastic polyester and it is required that the diameter d of the dispersion of the liq. crystal polyester in the film layer is 0.05-5mum and the relative standard deviation of this diameter d of the dispersion is 1.2 or smaller. In addition, it is necessary that the ratio d/t of the diameter d of the dispersion of the liq. crystal polyester to the lamination thickness t of the layer incorporated with the liq. crystal polyester is 0.05 or larger and 5 or smaller. The relative standard deviation of the distribution of the height of the projection on the surface of the outermost surface layer is 1.2 or smaller.

公开(公告)号：JPH04201233A

公开(公告)日：1992-07-22

申请号：JP33545390

申请日：1990-11-29

Applicant: TORAY INDUSTRIES

Inventor： MINAMIZAWA HIDEHITO ,  OKAZAKI IWAO ,  ABE KOICHI

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29K105/16 ,  B29L7/00

Abstract: PURPOSE:To improve both high-speed travelling and the difficulty to damaging (the flaw of a magnetic surface) of the magnetic surface by containing a specific quantity of inactive grains and bringing a void, grain flatness in a film, film mean grain size and the projection flatness of a projection formed to the surface of the film to specific values in the inactive grains. CONSTITUTION:0.005-5wt.% inactive grains are contained. The inactive grains have a 30-80% void, 1.5-5 grain flatness in a film and mean grain size of 0.01-3mum in the film. The projection flatness of a projection formed to the surface of the film is 0.02-0.2. A bent type biaxial kneading extruder is used as a method, in which inactive grains are included in specified polyester. A method, in which master pellets having high concentration are diluted on film formation, is employed as a method, in which the content of grains is adjusted. Polyester is dried sufficiently, fed to a melt extruder, passed through a high-accuracy filter, melt-extruded from a slitty mouthpiece, and cooled and solidified, thus manufacturing a film not oriented. The film not oriented is biaxially oriented, and biaxially orientated.

公开(公告)号：JPH04130139A

公开(公告)日：1992-05-01

申请号：JP25129090

申请日：1990-09-19

Applicant: TORAY INDUSTRIES

Inventor： MINAMIZAWA HIDEHITO ,  NISHINO SATOSHI ,  ABE KOICHI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08J5/18 ,  C08K3/26 ,  C08K7/16 ,  C08L67/00 ,  C08L67/02

Abstract: PURPOSE:To obtain a polyester film having a high resistance to high-speed scratching and suffering little degradation even in a high-speed dubbing by incorporating a specified amt. of CaCO3 comprising ellipsoidal particles having a specified flatness and a specified mean diameter and specifying the thickness orientation index. CONSTITUTION:A polyester film which contains 0.002-10wt.% powdered CaCO3 comprising ellipsoidal particles having a flatness in the film of higher than 1.5 and lower than 10 and a mean diameter of 0.01-5mum and in which the thickness orientation index is 1.2 or lower is prepd. The film has a high resistance to high-speed scratching during film processing or in the use as a final product, shows excellent high-speed dubbing properties when used as a magnetic tape, and hence is useful as a base film for a magnetic recording medium.

公开(公告)号：JPH03232178A

公开(公告)日：1991-10-16

申请号：JP2783290

申请日：1990-02-07

Applicant: TORAY INDUSTRIES

Inventor： NISHINO SATOSHI ,  ABE KOICHI ,  MINAMIZAWA HIDEHITO

IPC: G11B23/087 ,  C09D5/23 ,  C09D7/12 ,  G11B5/73 ,  G11B5/733 ,  G11B15/60

Abstract: PURPOSE:To achieve the video tape cassette that is superior in both dropout resistance and traveling property by making a guide pin out of a specified material and structuring a video tape with a base film containing specified particles. CONSTITUTION:The guide pin is in the video tape cassette, and is in contact with the video tape on its nonmagnetic surface side. In this case, the guide pin is made of resin, and the video tape contains organic particles in its base film. Thus, by making the guide pin out of a specified material and structuring the video tape with its base film containing specified particles, no abrasion takes place on the guide pin and the base film with each other, and the video tape cassette having superior in drop-out resistance and traveling properties can be obtained.

公开(公告)号：JPH02286721A

公开(公告)日：1990-11-26

申请号：JP10733389

申请日：1989-04-28

Applicant: TORAY INDUSTRIES

Inventor： NISHINO SATOSHI ,  MINAMIZAWA HIDEHITO ,  ABE KOICHI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08J5/18 ,  C08K3/00 ,  C08L67/00 ,  C08L67/02

Abstract: PURPOSE:To improve the scratch resistance of the surface and the abrasion resistance to chipping or the like by forming a biaxially oriented polyester film containing internally deposited particles and inert particles specified in a mean particle diameter, a Mohs hardness and a content. CONSTITUTION:A biaxially oriented polyester film containing internally deposited particles and inert particles A, wherein the particle A has a mean primary particle diameter of 0.002-0.25mu, a Mohs hardness >=7 and a content of 0.02-5wt.%. The polyester has at least one kind of a structure selected from among units of ethylene terephthalate, ethylene alpha,beta-bis(2-chlorophenoxy) ethane-4,4'-dicarboxylate and ethylene 2,6-naphthalate as the main structural component. A polyester having ethylene terephthalate units as the principal structural component is particularly desirable because of its better scratch resistance.

公开(公告)号：JPH02214736A

公开(公告)日：1990-08-27

申请号：JP3512289

申请日：1989-02-16

Applicant: TORAY INDUSTRIES

Inventor： NISHINO SATOSHI ,  MINAMIZAWA HIDEHITO ,  ABE KOICHI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08G63/18 ,  C08J5/18 ,  C08K3/00 ,  C08K7/00 ,  C08L67/00 ,  C08L67/02

Abstract: PURPOSE:To provide the subject film containing specific amounts of two specific kinds of particles, having excellent scratch resistance and abrasion resistance and suitable as a base film for magnetic tape, packaging film and film for various industrial materials. CONSTITUTION:The objective film contains two kinds of particles A and B. The particle A has an average particle diameter of 5-300nm and its content in the film is 0.1-2wt.%. The particle B has an average particle diameter of 30-2,000nm and its content in the film is 0.005-0.5wt.%. The concentration of the particle A in the vicinity of the particle B is higher than the concentration in the other region. The surface resistivity of the film is preferably OMEGA.cm.

公开(公告)号：JPH01207329A

公开(公告)日：1989-08-21

申请号：JP3147088

申请日：1988-02-13

Applicant: TORAY INDUSTRIES

Inventor： NISHINO SATOSHI ,  MINAMIZAWA HIDEHITO ,  ABE KOICHI

IPC: B29C55/12 ,  B29K67/00 ,  B29L7/00 ,  C08J5/18 ,  C08K5/5419 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733

Abstract: PURPOSE:To obtain the title film suitable for packaging, condenser and base film of magnetic tape, etc., having excellent resistance to wear and runnability, containing particles of specific type and having specific range of standard deviation of height of the surface protrusion. CONSTITUTION:The aimed film contains silicone elastomer particles (preferably 0.1-5mum average particle diameter, 0.001-1.0wt.% content of the particles and elastic modulus) and has =25wt.% of the silicone elastomer particle component is bifunctional organopolysiloxane.