Ube Industries, Inc.

Kazuaki Mii

Shuji Tanaka

Ryoji Sugise

Seiichirou Takabayashi

Hirofumi Ii

Kenichiro Yano

Katsuo Imatani

Shuji Watakabe

An alkyl nitrite is produced with high efficiency by bringing a nitrogen monoxide gas into contact with an aqueous solution of an alkyl alcohol and nitric acid in a reactor, which aqueous solution may be a liquid fraction generated in an alkyl nitrite-production process in which an alkyl alcohol is reacted with nitrogen monoxide and oxygen in a reaction column

Process for producing alkyl nitrite

An alkyl nitrite is produced with high efficiency by bringing a nitrogen monoxide gas into contact with an aqueous solution of an alkyl alcohol and nitric acid in a reactorwhich aqueous solution may be a liquid fraction generated in an alkyl nitrite-production process in which an alkyl alcohol is reacted with nitrogen monoxide and oxygen in a reaction column

An aromatic polyimide film directly laminated with a metal foil and an aromatic polyimide film directly laminated on both sides with a metal foil wherein the polyimide film (substrate) comprises an aromatic polyimide layer-A of 6-200 .mu.m thick whose polyimide is derived from a biphenyltetracarboxylic acid or its derivative and a phenylenediamine and an aromatic polyimide layer-B of 0.2-15 .mu.m thick whose polyimide is derived from an aromatic tetracarboxylic acid or its derivative and an aromatic diamine having plural benzene rings, and the polyimide layer-A has a thickness of not less than 55% of the total thickness of the aromatic polyimide substrate film, the polyimide layer-B is fixed to the polyimide layer-A under the condition that the layer-B cannot be peeled from the layer-A along the interface between these layers-A and -B and the metal foil is directly fixed on the surface of the polyimide layer-B via no adhesive.

Aromatic polyimide film laminated with metal foil

A process for preparing a metallized polyimide film, comprising the steps of: forming a solidified film containing 100 parts by weight of an aromatic polyamic acid in the form of a solution obtained by polymerizing approximately equal moles of an aromatic tetracarboxylic acid component and an aromatic diamine component and 5 to 150 parts by weight of an organic polar solvent; applying a surface treatment solution containing a heat-resistant surface treating agent to the surface of the solidified film; heating the solidified film to a high temperature to imidize the polyamic acid, while drying the film to prepare a polyimide film; forming a thin metal vapor-deposited layer by a vapor deposition of a metal on the treated surface of the polyimide film with the heat-resistant surface treatment agent; and applying metal plating onto the metal vapor deposited layer to form a metal plated layer thereon.

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Ube, Japan

Kazuaki Mii