Teijin Dupont Films Japan Limited

Dupont Teijin Films U.S. Limited Partnership

Katsuyuki Hashimoto

Tetsuo Yoshida

Duncan Henry MacKerron

Takeshi Ishida

Ieyasu Kobayashi

Makoto Handa

Robert William Eveson

Shinji Muro

Andrew Nathan Hodgson

Koji Kubo

Shinji Yano

Makoto Tsuji

Shinya Togano

Duncan Henry Mackerron

A biaxially oriented composite film includes a polyester substrate supporting one or more coatings on one or both surfaces of said substrate,

Manufacturing process for coated polyester film

A method of preventing or minimizing the formation of haze in a biaxially oriented polyester film during the annealing of said film above its glass transition temperature, said method comprising: (a) selecting a biaxially oriented polyester film having glass transition temperature (Tg (&#xb0; C.)); (b) disposing a coating on one or both surfaces of said biaxially oriented film; (c) annealing said coated biaxially oriented polyester film at a temperature above its glass transition temperature, wherein said coating composition is selected from: (i) an organic coating comprising a low molecular weight reactive diluent; an unsaturated oligomer; a solvent; and a photoinitiator; (ii) an organic/inorganic hybrid coating comprising a low molecular weight reactive component and/or an unsaturated oligomeric component; a solvent; and inorganic particles, and optionally further comprising a photoinitiator; (iii) a predominantly inorganic hardcoat comprising inorganic particles contained in a polymerisable predominantly inorganic matrix; and (iv) a composition comprising a cross-linkable organic polymer selected from polyethylene imine (PEI), polyester and polyinylalcohol (PVOH), and a cross-linking agent.

A process in which a wound roll of biaxially oriented polyester film having a glass transition temperature (Tg (&#xb0; C.)) is annealed at a temperature T(&#xb0; C.) above Tg where Tg&#x3c;T&#x2266;Tg+100 (&#xb0; C.) for a time t after thermal equilibrium where 1 hour&#x2266;t&#x2266;72 hours and cooled, for the purpose of improving the shrinkage of said polyester film.

Manufacturing process for polyester film exhibiting low thermal shrinkage

An object of the present invention is to provide a thin biaxially oriented film excellent in dimensional stability against humidity change, as well as a magnetic recording medium and a film capacitor using the same. The present invention provides a single layered or laminated biaxially oriented film comprising an aromatic polyester (a) and a polyolefin (b) having a melting point of from 230 to 280&#xb0; C., wherein the ratio of the polyolefin (b) is from 5 to 30% based on the entire weight of the film, and the film thickness is from 1 to 10 &#x3bc;m.

Biaxially oriented film

A thin biaxially oriented film excellent in dimensional stability against humidity change, as well as a magnetic recording medium and a film capacitor using the same. The present invention provides a laminated biaxially oriented film comprising: at least one layer comprising an aromatic polyester (a); and at least one layer of a polyolefin (b) having a melting point of from 230 to 280&#xb0; C.; wherein the ratio of the polyolefin (b) is from 2 to 60% based on the entire weight of the film, and the film thickness is from 1 to 10 &#x3bc;m.

An object of the invention is to provide such an oriented polyester film that has a constant thickness, and is excellent in dimensional stability at a high temperature and dimensional stability to temperature change in a working temperature range. The invention relates to an oriented polyester film containing as a major component of a substrate layer polyethylene -2,6-naphthalene dicarboxylate, being stretched at least in one direction, and having a film thickness of from 12 to 250 &#x3bc;m, wherein

Oriented polyester film

The object of the present invention is to provide a laminated film excellent in light resistance, scratch resistance, transparency, dimensional stability and adhesion to a hard coating layer. The present invention is a laminated film comprising a base material layer, an easily adhering layer and a hard coating layer, wherein the easily adhering layer is formed on the base material layer and the hard coating layer is formed on the easily adhering layer, and further wherein (1) the base material layer is formed of a polyester resin formed from naphthalenedicarboxylic acid as a main dicarboxylic acid component and ethylene glycol as a main glycol component, (2) the hard coating layer has an ultraviolet absorbing function and has a pencil hardness of H or higher on the hard coating layer surface, and (3) said laminated film has a variation (&#x394;b*) of less than 2.0 between transmittance b* values obtained before and after a 300 hours' xenon arc test of said laminated film.

Laminate film

There is provided a laminated polyester film which is improved in lubricity, transparency, dimensional stability, shock resistance and adhesion, and which comprises a polyester base film comprising polyester and to at least one direction, and a coating layer provided on at least one surface of the base film, wherein said coating layer contains polymer binder and inert particles, the refractive index of the inert particles being substantially same as that of the polymer binder, and wherein the laminated polyester film has a haze of 1.5% or less, a total light transmittance of 85% or more, 50% destructing energy per 100 &#x3bc;m film thickness of 0.3 J or more, and a thermal shrinkage at 230&#xb0; C. for 30 minutes of 4% or less.

Growing community of inventors

Gifu, Japan

Katsuyuki Hashimoto