Teijin Limited

Norio Takagi

Shigenobu Sobajima

Hiroshi Okaniwa

Shozo Nitta

Hideshi Kurihara

Tetsuo Ichihashi

Masami Etchu

Kiyoshi Chiba

Hiroshi Aoyagi

Kazuyuki Sanenobu

Hiyoshi Chiba

Takao Yamaguchi

Yo Goto

Process for producing polyester sheet and film

A process for producing a biaxially oriented polyester film including the steps of causing a molten aromatic polyester which contains naphthalene-2,6-dicarboxylatic acid as a main dicarboxylic acid component and ethylene glycol as a main glycol component to pass through a single-layer or multi-layer metal fiber nonwoven fabric, melt extruding the molten polymer into a form of a sheet, quenching and solidifying the sheet to produce an unoriented film, biaxially orienting the unoriented film, and thermally setting the biaxially oriented film to form a biaxially oriented polyester film, as a base film for a photographic film, which contains substantially no gel as large as 40 .mu.m or more.

Process for producing biaxially oriented polyester film as a base film

Aromatic polyester film and process for producing the same

A process for preparing a thermoplastic resin film by extruding a molten thermoplastic film-forming resin in the form of a continuous molten film onto an electrically grounded moving quenching surface, passing the molten film in proximity to but out of contact with at least one electrode which imparts an electrostatic charge to the film across its full width and withdrawing a solidified film thus formed from said quenching surface; which process comprises extruding the molten film onto a quenching surface characterized by having a channel-like microcracked structure.

Process for preparing cast film of thermoplastic resin

A process for producing a film of reduced thickness unevenness which comprises extruding a thermoplastic resin from an extrusion die into a film form, exposing the extrudate to an electric field induced by an electrostaticity applying electrode, and then pinning it to the surface of a cooling drum, wherein a shielding object is disposed between the extrusion surface of the die and the electrostaticity applying electrode thereby to maintain the applied voltage constant in the widthwise direction of the extrudate and to enable the extrudate to adhere intimately to the surface of the cooling drum, and an apparatus for producing a film of reduced thickness unevenness comprising an extrusion die equipped with means for adjusting the thickness unevenness of the film by temperature control, an electrode for applying electrostaticity, a cooling drum and a shielding object, said shielding object being a conductive object, a non-conductive object or a combination of these, and being disposed between the extrusion surface of the die and the electrostaticity applying electrode.

Process for producing thermoplastic resin films having reduced thickness

When a file having coated thereon an electrically conductive coating which is transparent in a highly oxidized state and non-transparent in a lowly oxidized state or in a reduced state, such as a coating of indium oxide, is heated electrically or by laser beams or oxidized and/or reduced by electrolytic reaction, images consisting of transparent and non-transparent areas are formed on the film. This can be utilized, for example, in a facsimile system.

Method for forming images by differential oxidation

When a file having coated thereon an electrically conductive coating which is transparent in a highly oxidized state and non-transparent in a lowly oxidized state or in a reduced state, such as a coating of indium oxide, is heated electrically or by laser beams or oxidized and/or reduced by electrolytic reaction, images consisting of transparent and non-transparent areas are formed on the film through an electrolytic layer on this film. This can be utilized, for example, in a facsimile system.

Method for forming images using an electrolytic layer in redox recording

Growing community of inventors

Zama, Japan

Norio Takagi