Mitsubishi Gas Chemical Company, Inc.

Mitsubishi Gas Chemical Company Co., Inc.

Jitsuo Oishi

Shuta Kihara

Yuzuru Takahashi

Shinichi Nagao

Tsuyoshi Bito

Nobuyuki Koike

Ryusuke Shigematsu

Hitoshi Sakamoto

Ko Kedo

Akio Hashimoto

Yukio Sakai

Koichi Kanno

Yasuhiro Hirai

Masayoshi Hayashi

Takahumi Yoshimura

Kyoko Shibahara

Takaaki Higashiizumi

Takashi Makinoshima

Kenichi Nakamura

Masato Inari

Takakiyo Mine

Hiroshi Machida

Sotaro Hiramatsu

Kenji Nakaya

Hiroaki Shigeta

Wataru Ueno

Masahito Ohkido

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

A polyimide resin which is satisfactory in solvent solubility and heat resistance, has a low coefficient of water absorption and is excellent in adhesive properties and a method for manufacturing the same, a film containing the subject polyimide resin and a metal-clad laminate including an adhesive layer composed of the subject polyimide resin are provided. The polyimide resin is a polyimide resin containing a molecule having a repeating unit represented by a structure of any one of the following formulae (1) to (3) in a specified proportion, whose molecular end is capped by an end-capping agent. 

Polyimide resin

A method for producing a colorless transparent resin film by a solution flow casting method containing: flow-casting an organic solvent solution of a polyamic acid or a polyimide on a support; and drying, the method containing at least the following step (1), step (2) and step (3) in this order, and an apparatus therefor:

Process and apparatus for production of colorless transparent resin film

A polyimide resin composed of a repeating unit represented by the following formula (1): or composed of the repeating unit represented by the formula (1) and at least one repeating unit represented by the following formula (2): wherein X is the same as defined in the specification, exhibits a good thermoplastic property, a high solubility in solvents and a good heat resistance as well as a low water absorption and an excellent adhesion property. The polyimide resin is useful as the material for the adhesive layer of a metal-clad laminate which is composed of an insulating substrate, a metal layer and an adhesive layer disposed between the insulating substrate and the metal layer.

Polyimide resin, polyimide film, and polyimide laminate

It relates to a highly heat resistant thermosetting polyimide resin composition that is cured at a temperature of 150&#xb0; C. or less, and provides a cured product that generates a less amount of decomposed gas even under heating to 250&#xb0; C., and has flexibility and adhesiveness. A two-component thermosetting polyimide resin composition containing a liquid A containing a polyimide (a) having a main chain constituted by a repeating unit having a polyoxyalkylenediamine structure with amino groups on both ends thereof, and a liquid B containing a bismaleimide compound, and a cured product of a thermosetting polyimide resin composition obtained by mixing these two liquids and curing the mixture under heating.

Two-part thermocurable polyimide resin composition and cured product thereof

A polyimide resin which is soluble in an organic solvent and which has a low coefficient of water absorption, thermosetting properties, high heat resistance and excellent adhesive properties, a method for manufacturing the same, an adhesive and a film each containing the subject polyimide resin and a metal-clad laminate including an adhesive layer composed of the subject polyimide resin are provided. The polyimide resin is a polyimide resin containing a repeating unit represented by the following formula (1) and a repeating unit represented by the following formula (2), with a proportion of a group presented by the following formula (3) being 50% by mole or more of the whole of X. 

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

A process for producing a high purity aromatic polycarboxylic acid (APA) by purification of a crude APA comprises: (I) aging a slurry of the crude APA in a first dispersion medium at 180 to 300&#xb0; C. for 10 minutes or longer under stirring; (II) introducing the aged slurry of the APA into a column for substituting dispersion media, bringing the slurry into contact with a second dispersion medium and separating the resultant fluid into a fluid of the first dispersion medium containing impurities and a slurry of the second dispersion medium containing crystals of the high purity APA; and (III) separating the crystals of the high purity APA from the slurry of the second dispersion medium. A high purity APA having excellent hue and particle diameter can be industrially advantageously produced while the construction of the process is simplified and the consumption of energy is decreased.

Process for producing a high purity aromatic polycarboxylic acid

A process for producing a high purity aromatic polycarboxylic acid by purify a crude aromatic polycarboxylic acid in accordance with the steps of (I) forming an amine salt of an aromatic polycarboxylic acid from the crude polycarboxylic acid and an amine, (II) continuously decomposing the salt in a salt decomposition reactor in operations of (i) supplying an aqueous solution of the amine salt of an organic polycarboxylic acid formed in the step of forming a salt, (ii) removing the amine and water by distillation under heating and (iii) taking out a slurry containing crystallized aromatic polycarboxylic acid, and (III) separating and recovering crystals of the aromatic polycarboxylic acid from the slurry which is taken out in the step of decomposing the salt. A high purity aromatic polycarboxylic acid having excellent hue and large particle diameters can be produced from a crude aromatic polycarboxylic acid industrially with stability at a low cost of production in accordance with a process having a simple construction.

A method for preparing a modified optically isotropic pitch comprising, preparing a synthetic pitch by reacting a member selected from the group consisting of a conjugated polycyclic hydrocarbon containing a low molecular weight alkyl group or a material containing such a substituted hydrocarbon in the presence of hydrofluoric acid/boron trifluoride, and treating the synthetic pitch by passing an oxidizing gas through the synthetic pitch at elevated temperatures.

Method for producing isotropic pitch, activated carbon fibers and carbon materials for non-aqueous secondary battery anodes

Method for producing isotropic pitch, activated carbon fibers and carbon

The invention provides for a lithium secondary battery using a non-aqueous solvent wherein the anode material is prepared by the pyrolysis of organic compound starting materials obtained by reacting at least one conjugated polycyclic compound with a nitro compound or with a nitrating agent. The anode material contains at least the elements carbon and nitrogen, the nitrogen content ranging from 0.5% to 6% by weight. Eighty percent or more of this nitrogen is bound to carbon by either C--N or C.dbd.N bonds. The ratio of the intensity of the x-ray photoelectron spectroscopy ('XPS') peak observed for the anode material at 401.2.+-.0.2 eV to the intensity of peak observed for the anode material at 398.8.+-.0.4 eV is 1.0:1 or more.

Lithium secondary battery using a non-aqueous solvent

A mixture of carbon powder and a carbonaceous binder is molded and pyrolyzed in an atmosphere of nitrogen to form a carbon molded article for a negative electrode. The properties of the carbon molded article are: an interfacial distance (d002) within a range from 3.38 .ANG. to 3.56 .ANG. measured by X-ray diffraction; and a three-point strength of 100 kgf/cm.sup.2 or greater at room temperature. A lithium secondary battery formed by using this carbon molded article as the negative electrode has a high energy density per unit volume and advantageous charge-discharge characteristics for higher loads.

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Kanagawa, Japan

Jitsuo Oishi