Teijin Limited

Teijin Dupont Films Japan Limited

Teijin Dupont Films Japan Limtied

Mitsuo Tojo

Toshifumi Osawa

Makoto Handa

Toshikazu Uchida

Ieyasu Kobayashi

Eiji Kinoshita

Hirofumi Murooka

Shinji Muro

Tsuyonari Nohira

Takeshi Ishida

Koji Kubo

Tetsuo Ichihashi

Masahiko Kosuge

Shinji Yano

Tomoyuki Kishino

Kazuteru Kohno

Tomokatsu Ura

Akira Kameoka

A biaxially oriented film for reinforcing the electrolyte membrane of a polymer electrolyte fuel cell, wherein the film includes (i) a layer mainly composed of polyethylene naphthalene dicarboxylate and has (ii) a Young's modulus in at least one direction of not less than 9,000 MPa and (iii) a thickness of 15 to 150 &#x3bc;m. The biaxially oriented film has a satisfactory reinforcing effect as a reinforcing member for a polymer electrolyte membrane at the operation temperature of a polymer electrolyte fuel cell though it is a thin film.

Reinforcing film for the electrolyte membrane of a polymer electrolyte fuel cell

An object of the invention is to provide a biaxially oriented polyester film for automobile driving motors, which has, in addition to high-temperature dimensional stability, high hydrolysis resistance required for an insulating film of an automobile driving motor, and also exhibits excellent delamination characteristics.

Biaxially oriented polyester film for automobile driving motors, and electrically insulating member therefrom

A polyester film roll is rolled on a core, wherein the difference R (m) between the maximum value and the minimum value of the diameters of the roll is not more than 2W&#xd7;10and not more than L&#xd7;10, when the diameters of said roll are measured in the width direction of the roll, (therein, W is the width (m) of the film roll, and L is the length (m) of the rolled film). Alternatively, among the lengths of lines which are obtained by measuring the diameters of said roll in the width direction of the roll, drawing a straight line between both the ends of the curved line of the obtained roll diameters, the maximum distance on the convex portion between the curved and straight lines is not more than 500 &#x3bc;m, and the maximum distance on the concave portion of the same is not more than 300 &#x3bc;m.

Polyester film roll

A biaxially oriented laminated polyester film which has dimensional stability against environmental changes such as temperature and humidity variations and rarely elongates when a load is applied thereto at a high temperature. The biaxially oriented laminated film comprises a film layer (A) made of an aromatic polyester (A) and a film layer (B) made of an aromatic polyester (B), wherein (in the formula (I), R is an alkylene group having 1 to 10 carbon atoms.)

Biaxially oriented laminated film

A biaxially oriented laminated polyester film which has excellent dimensional stability to environmental changes such as temperature and humidity variations and excellent flatness and windability. A biaxially oriented laminated polyester film comprising a film layer B on one side of a film layer A and having a surface roughness (RaB) on the film layer B side which is 1.0 nm or more larger than the surface roughness (RaA) on the film layer A side, wherein at least one of the film layers comprises an aromatic polyester (I) composed of a glycol component and a dicarboxylic acid component containing 5 mol % or more and less than 80 mol % of a recurring unit represented by the following formula (A): wherein Ris an alkylene group having 1 to 10 carbon atoms.

The polyester film roll, which is free from wrinkles and slacks generated with the passage of time and is having a good roll appearance, is provided without changing the characteristics of the film. The polyester film roll is a polyester film roll in which a polyester film is rolled on a core, characterized in that the difference R (m) between the maximum value and the minimum value is not more than 2 W&#xd7;10and not more than L&#xd7;10, when the diameters of said roll are measured in the width direction of the roll, (therein, W is the width (m) of the film roll, and L is the rolled length (m) of the film roll), or a polyester film roll in which a polyester film is rolled on a core, characterized in that, among the lengths of lines which are obtained by measuring the diameters of said roll in the width direction of the roll, drawing a straight line between both the ends of the curved line of the obtained roll diameters, and then vertically drawing the lines from said curved line to said straight line, the maximum length (maximum convex portion) on the convex portion side from said straight line is not more than 500 &#x3bc;m, and the maximum length (maximum concave portion) on the concave portion side from said straight line is not more than 300 &#x3bc;m.

A polyester resin having excellent dimensional stability against environmental changes and excellent dimensional stability in the processing step while having excellent moldability and a biaxially oriented polyester film comprising the same. The polyester resin comprises a recurring unit represented by the following formula (A) and a recurring unit represented by the following formula (B) as the main constituents:&#x2014;O&#x2014;C(O)&#x2014;R&#x2014;C(O)&#x2014;O&#x2014;R&#x2014;O&#x2014;&#x2003;&#x2003;(A)&#x2014;O&#x2014;C(O)&#x2014;R&#x2014;C(O)&#x2014;O&#x2014;R&#x2014;O&#x2014;&#x2003;&#x2003;(B)(R' is a phenylene group or naphthalenediyl group, Ris an alkylene group having 2 to 4 carbon atoms or cyclohexylene group, and Ris 6,6&#x2032;-(alkylenedioxy)di-2-naphthoic acid), wherein the content of the recurring unit (B) is not less than 5 mol % and less than 50 mol %, and the ratio of adjacent recurring units (A) and (B) is less than 0.9 based on a value obtained by doubling the product of the content of the recurring unit (A) and the content of the recurring unit (B).

Polyester resin, production process therefor, and biaxially oriented polyester film comprising the polyester resin

An optical adhesive polyester film comprising (A) a polyester film layer containing an aromatic polyester and an ultraviolet absorber and (B) a coating formed on at least one surface of the polyester film (A). The coating (B) contains at least one polymer selected from the group consisting of a coating polyester having a glass transition point of 40 to 100&#xb0; C. and an acryl polymer having a glass transition point of 20 to 80&#xb0; C. in an amount of 50 to 95% by weight based on the coating. The optical adhesive polyester film is disposed on the front of a plasma display so as to block externally incoming ultraviolet light.

Optical adhesive polyester film

Biaxially oriented laminate polyester film for magnetic recording medium

A biaxially oriented polyester film for magnetic recording media which has (1) a Young's modulus in a machine direction of 5.0 GPa or less and a Young's modulus in a direction perpendicular to the machine direction of 8.0 GPa or more, (2) a surface roughness on one side of 0.3 to 1.5 nm when measured for a measurement area of 246.6&times;187.5 &mgr;m and 0.1 to 3.0 nm when measured for a measurement area of 2.5&times;1.9 mm and a surface roughness on the other side of 0.6 to 2.5 nm when measured for a measurement area of 246.6&times;187.5 &mgr;m and 0.1 to 5.0 nm when measured for a measurement area of 2.5&times;1.9 mm, and, (3) controlled heat shrinkage factors in the machine and transverse directions at 105&deg; C. and 150&deg; C.

Polyester film with specified surface roughness, Young's modulus and heat shrinkage for use as substrate for magnetic recording medium

Laminate film with organic particulate for a magnetic recording medium

A composite polyester film comprising (1) a base film C of an aromatic polyester which does not contain or contains inert particles having an average particle diameter of 5 to 2,000 nm in an amount of 0.001 to 5.0 wt % based on the aromatic polyester; (2) a coating layer A on one side of the base film C, which comprises a binder resin, inert particles, a surfactant and a siloxane copolymeried acrylic resin, the outer surface of the coating layer A being not a surface for forming a magnetic layer thereon, and the siloxane copolymerized acrylic resin being contained in an amount of 1 to 50 wt % based on the coating layer A; and, (3) a coating layer B on the other side where the coating layer A is not existent of the base file C, which comprises one member selected from the group consisting of a siloxane copolymerized polyester resin, siloxane copolymerized acrylic resin, silicone and wax, a binder resin, inert particles and a surfactant, the outer surface of the coating layer B being a surface for forming a magnetic layer thereon, and the above member being contained in an amount of 5 to 90 wt % based on the coating layer B when the member is a siloxane copolymerized polyester resin or 1 to 50 wt % based on the coating layer B when the member is other than the siloxane copolymerized polyester resin.

Composite polyester film and magnetic recording medium

The present invention relates to a low electrostatic composite polyester film comprising a base film C, a coating layer A formed on one side of the base film C, and a coating layer B formed on the other side of the base film C, where (1) the coating layer A is formed of a water-soluble or water-dispersible resin coating inert particles and has a center line average roughness (Ra&minus;A) of the surface of 0.1 to 2 nm; (2) the coating layer B includes 1 to 40 wt % of inert particles and a composition containing a water-soluble or water-dispersible resin, the resin-containing composition containing 5 to 85 wt % of a silicone-modified polyester resin or 1 to 30 wt % of silicone or wax based on the layer B; and (3) the base film C is formed of an aromatic polyester. According to the present invention, it is possible to provide a composite polyester film useful as a base film for a magnetic recording medium that has low electrostatic properties and is excellent in not only blocking resistance and abrasion resistance but also electromagnetic conversion characteristics and adhesion to a back coat.

Lowly electrifiable composite polyester film

A film roll in which the distance from the center line of the film roll to the edge of the film extending in a film winding direction is slightly changed in a film breadthwise direction.

Film roll of a thermoplastic resin film

A laminate film comprises a base film and a second film layer containing core-shell particles and a hydrophilic resin. The laminate film is useful for a base film for a magnetic recording medium.

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Gifu, Japan

Mitsuo Tojo