Toray Industries, Inc.

Itsuo Nagai

Shigeru Tanaka

Masayoshi Asakura

Takumi Hirano

Yukichi Deguchi

Hiroaki Kobayashi

Kenji Hatada

Takashi Ueda

Seizo Aoki

A biaxially oriented polypropylene film to be metallized, including a surface layer made of a polypropylene resin with the endothermic main peak by crystal fusion in a range of 155 to 163&deg; C. and with a heat of crystal fusion of 20 to 90 J/g, being laminated layer at least on one side of the base layer made of isotactic polypropylene; and the wetting tension of the surface layer, being 33 to 55 mN/m. A metallized biaxially oriented polypropylene film, including a thin metallic film, being laminated on the surface layer of said biaxially oriented polypropylene film to be metallized. A laminate obtained by using said metallized biaxially oriented polypropylene film.

Biaxially oriented polypropylene film to be metallized a metallized biaxially oriented polypropylene film and a laminate formed by using it

A transparent gas barrier biaxially oriented polypropylene film, comprising a base layer mainly composed of a polypropylene polymer, a polyolefin resin layer of 30 to 85 J/g in the heat of fusion formed at least on one side of the base layer, and an imperfectly oxidized alumina layer formed on the polyolefin resin layer, wherein the aluminum metal concentration in the internal portion of the imperfectly oxidized alumina layer is higher than that in the surface of the layer and that in the interface with the polyolefin resin layer, and the aluminum metal content of the imperfectly oxidized alumina layer is kept in a range of 10 to 200% nm. It is a transparent metallized gas barrier biaxially oriented polypropylene film excellent in moisture and oxygen barrier properties and also excellent in the gas barrier properties after elongation.

Transparent gas barrier biaxially oriented polypropylene film, a

Polypropylene film and capacitor made by using it as a dielectric

Polyester film for electrical insulation

The present invention relates to a biaxially oriented polypropylene film and a capacitor made thereof. The biaxially oriented polypropylene film of the invention is a biaxially oriented polypropylene film that is 98-99.5% in isotacticity, above 99% in isotactic pentad fraction, and 1-4% in the sum of the machine- and transverse-direction heat shrinkage at 120.degree. C., or a biaxially oriented polypropylene film that is less than 10 ppm.multidot.% in the product of the film's ash content and internal haze and is above 99% in isotactic pentad fraction. With this constitution, the biaxially oriented polypropylene film of the present invention has good dielectric properties at high temperatures. Furthermore, the capacitor of the invention can be used safely for a long life at operating temperatures higher by up to 20.degree. C. than the maximum operating temperature of 85.degree. C. of the conventional biaxially oriented polypropylene films.

Biaxially oriented polypropylene film and a capacitor made thereof

The present invention provides with a shaped article of a fluorocarbon polymer having a fluorine/carbon ratio of 1.9 to 2.0, in which at least a part of surface has a fluorine/carbon ratio of 0.8 to 1.8. The shaped article has an improved adhesive properties, especially heat-sealing adhesive property and can be manufactured by a low-temperature plasma treatment of the surface of the fluorocarbon polymer shaped article. As compared with conventional surface-reformed ones, the fluorocarbon polymer shaped article of this invention has an improved adhesive property, especially for heat-sealing, which is not deteriorated during their storage either at a high temperature, at a high humidity or on exposure to ultraviolet ray.

Shaped article of fluorocarbon polymer having adhesive surface

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Shiga, Japan

Itsuo Nagai