Mitsubishi Gas Chemical Company, Inc.

Ko Kedo

Shuta Kihara

Makoto Takagawa

Norio Fushimi

Jitsuo Oishi

Kenji Inamasa

Fumiya Zaima

Takashi Makinoshima

Takakiyo Mine

Ryusuke Shigematsu

Kinji Kato

Hiroshi Machida

Hiroki Oguro

Kuniaki Ageishi

The present invention provides a metal-clad white laminate including: a white resin layer which is composed of a resin composition obtained by mixing a polyimide having a repeating unit as represented by a particular chemical structural formula with a white pigment; and at least one metal layer, the white resin layer being an adhesive layer for the metal layer. The metal-clad white laminate of the present invention uses a white resin composition which has high reflectance and whiteness and excellent light resistance, and is easy to be reduced in thickness and weight.

Metal-clad white laminate

The invention is directed to a process for producing polyimide film, including stretching, at 150&#xb0; C. to 380&#xb0; C. and a stretch ratio of 1.2 to 4.0, an unstretched polyimide film which is formed from a polyimide having a repeating unit represented by formula (1): (wherein R represents a tetravalent group derived from cyclohexane; and &#x3a6; represents a divalent aliphatic, alicyclic, or aromatic group, or a combination thereof that has a total number of carbon atoms of 2 to 39 and may have at least one connecting group selected from the group consisting of &#x2014;O&#x2014;, &#x2014;SO&#x2014;, &#x2014;CO&#x2014;, &#x2014;CH&#x2014;, &#x2014;C(CH)&#x2014;, &#x2014;OSi(CH)&#x2014;, &#x2014;CHO&#x2014;, and &#x2014;S&#x2014;) and which has an organic solvent content of 0.5 wt. % or more and less than 30 wt. %. The produced polyimide film exhibits transparency, excellent heat resistance, and reduced dimensional changes.

Process for producing polyimide film

The flexible metal-clad laminate of the present invention comprises at least one polyimide layer made of a polyimide having repeating units represented by the following formula I: wherein R and &#x3a6; are as defined in the specification, and at least one metal layer. The polyimide is soluble in solvents and excellent in heat resistance and adhesion property, and shows a low dielectric constant even in a high frequency range.

Metal-clad laminate

The metal foil-clad laminate of the present invention comprises at least one polyimide layer made of a polyimide having repeating units represented by the following formula I: wherein R and &#x3a6; are as defined in the specification, at least one insulating substrate, and at least one metal foil layer. The polyimide is excellent in thermopress-bonding property, solubility in solvents and heat resistance, and exhibits a low dielectric constant. The metal foil-clad laminate having the polyimide layer is suitably applicable to high-frequency printed wiring boards, etc.

Metal foil-clad laminate

A transparent electrically-conductive film comprising a substrate made of an aliphatic polyimide having a repeating unit of the formula [I] and a transparent electrically-conductive thin film layer, the transparent electrically-conductive thin film layer being provided on the substrate,

Transparent electrically-conductive film and its use

Process for producing a hydrogenation product of an aromatic carboxylic acid

A process for producing highly pure 2,6-dimethylnaphthalene in a high yield from a mixture of dimethylnaphthalene isomers in the presence of a solvent, such as an aliphatic or alicyclic saturated hydrocarbon. Highly pure 2,6-dimethylnaphthalene can be produced steadily for a long time by filtering the 2,6-dimethylnaphthalene crystal precipitated by the crystallizing by using a filtration apparatus, such as a rotary vacuum filter, peeling-off the filtered cake from a filter cloth and cleaning the filter cloth with a solvent, at a temperature not lower than a filtration temperature.

Process for producing 2,6-dimethylnaphthalene

There is disclosed a process for producing a monoalkenylbenzene which comprises alkenylating a side chain of an aromatic hydrocarbon compound having at least one hydrogen atom bonded at .alpha.-position of the side chain (such as xylene) with a conjugated diene having 4 or 5 carbon atoms (such as butadiene) in the presence of a catalyst produced by calcining the mixture of potassium hydroxide and aluminum hydroxide and then heat treating the calcined product together with metallic sodium in an atmosphere of an inert gas. According to the aforesaid process, an industrially useful monoalkenylbenzene can be produced in high yield at a low cost with enhanced safety.

Process for producing a monoalkenyl aromatic hydrocarbon compound

A process for producing a monoalkenyl aromatic hydrocarbon compound which comprises alkenylating a side chain of an aromatic hydrocarbon compound having at least one hydrogen atom bonded at an .alpha.-position of the side chain (such as xylene) with a conjugated diene having 4 or 5 carbon atoms (such as butadiene) in the presence of a catalyst comprising a mixture obtained by heat treating metallic sodium together with a mixture of an aluminum oxide and a potassium compound in an inert gas atmosphere. The process produces a commercially useful monoalkenyl aromatic hydrocarbon compounds in a high yields and at a low cost with enhanced safety.

Process for producing monoalkenyl armomatic hydrocarbon compound

A process for producing a monoalkenyl aromatic hydrocarbon compound which comprises alkenylating a side chain of an aromatic hydrocarbon compound having at least one hydrogen atom bonded at an .alpha.-position of the side chain (such as xylene) with a conjugated diene having 4 or 5 carbon atoms (such as butadiene) in the presence of a catalyst comprising a mixture obtained by heat treating metallic sodium together with a mixture of a zirconium oxide and a potassium compound in an inert gas atmosphere. An industrially useful monoalkenyl aromatic hydrocarbon compound is produced in a high yield at a low cost with enhanced safety from a specific aromatic hydrocarbon compound and a specific conjugated diene compound.

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Tokyo, Japan

Ko Kedo