Chisso Corporation

Kazutsune Kikuta

Akihiro Sato

Shiro Konotsune

Toshihiro Uwai

Masami Tachibana

Kenji Matsuda

Tohru Hanari

Takao Kawamoto

Kouichi Kunimune

Hitoshi Yano

Yoshiharu Higuchi

Hiroaki Hase

Atsushi Takahashi

Masazumi Miyajima

Masaya Uetsuki

Hiroshi Shimizu

Hiromasa Chiba

Masato Harada

Takeshi Suzuki

Sadahiko Yamada

Jun Masuda

Setsuo Itami

Atsuyuki Kachi

Atsushi Suzuki

Mitsuo Kurita

Yoshihiro Soeda

Keizo Oka

Shouichi Fukunaga

Tadamitsu Hamasaki

Souichiro Hiraki

Nobutaka Hattori

A silicon-modified, adhesive polyimide film composed mainly of the repetition units of the formula (I) and a process for producing a polyimide film composite product using the above film are provided, the formula (I) being ##STR1## the above process for producing a polyimide film composite product comprising subjecting the above-silicon-modified polyimide film to contact-bonding on heating to a material to be adhered, at an ultimate curing temperature of 130.degree.-230.degree. C. The above polyimide film is highly adhesive and heat-resistant in spite of heating at a relatively low temperature.

Adhesive polyimide film

Metal-clad laminates and method for producing same

The present invention provides a process for producing molded articles of a polyimide precursor by a use of a usual extrusion technique, and physical properties of polyimide products prepared by the heat treatment of the molded articles of the polyimide precursor at 400.degree. C. are excellent. This process is characterized by drying a solid obtained by pouring a dilute solution of a polyimide precursor including an aromatic tetracarboxylic acid component and an aromatic diamine component 1 into a liquid in which the precursor is only poorly soluble to obtain a dry solid having a polyimide precursor concentration of 50-70% by weight, and then extruding this dry solid at 80.degree.-130.degree. C.

Process for producing molded articles of polyimide precursor

A method for producing circuit boards with a film having improved printing properties, adhesion, flexibility and heat resistance which comprises applying a liquid printing ink composition comprising an admixture of a solvent, a polyamide-acid and a partially imidized polyamide-acid, then heat to effect drying and curing.

Method for producing printed circuit boards

A flexible copper-applied substrate comprises a copper foil and a resin layer comprising a composite material of a polyimide and a polyimide silicone, the resin layer being directly formed on the surface of the copper foil, said substrate being producible by applying a polyamide acid composite composed of a mixed solution of a polyamide acid and a polyamide acid alkylsilane to a copper foil and heating.

Flexible copper-applied substrates

A flexible double-sided copper-clad printed-circuit base board is provided with a core resin layer of a composite material essentially composed of a specific rigid-structured polyimide and a specific flexible-structured crosslinked polyimide silicone in a state of being inseparable from each other, wherein the core resin layer is formed directly between two copper foils. This base board is produced by coating a surface of a copper foil with a polyamic acid solution mixture of a specific polyamic acid and a specific polyamic acid - alkylsilane, heat-treating the resulting coated copper foil, and contact-bonding another copper foil to the resulting copper-foil/polyimide laminate.

Flexible printed-circuit base board and process for producing the same

In a process for producing a flexible printed base by directly coating a copper foil with a polyimide precursor, followed by heating, drying and curing, a process affording a flexible printed base having a superior folding endurance and a good heat resistance at a cheap cost is provided, which process comprises carrying out the curing in an inert gas under a tension of 0.02 to 0.2 Kg/cm and at 200.degree. and 450.degree. C.

Process for producing a flexible printed base

A polyimide having a low elastic modulus and also superior heat resistance and mechanical characteristics and soluble in solvents and a process for producing the same are provided,

Polyamide having a low elastic modulus and a process for producing the

A crystalline polyimide polymer having a practical effectiveness that extrusion or injection molding which has so far been applied to thermoplastic resins, but could not have been achieved by conventional polyimides, are possible due to its melting point in the range of 300.degree. C. to 450.degree. C., and a process for producing the polymer, are provided, which polyimide polymer contains the following imide repetition unit (I) in 30% by mol based on the polymer and containing or not containing at least one of other imide repetition units and also having an inherent viscosity of 0.1 to 5 dl/g in conc. sulfuric acid at 30.+-.0.01.degree. C.: ##STR1## wherein X is divalent CO, divalent SO.sub.2 group, S, O or a single bond.

Melt-moldable crystalline polyimide polymer

A process for producing .alpha.-olefin polymers having high crystallinity and good particle form, with a high yield is provided. The polymerization therefor is carried out in the presence of a preactivated catalyst suitable particularly to gas phase polymerization or gas phase polymerization following slurry or bulk polymerization. The catalyst is prepared by reacting a reduction solid prepared by reducing TiCl.sub.4 with an organoaluminum compound, with an electron donor and an electron acceptor to obtain a solid product, and

Process for producing .alpha.-olefin polymers

A preactivated catalyst for producing .alpha.-olefin polymers is provided, which is obtained by the steps which comprises:

Preactivated catalyst for producing .alpha.-olefin polymers

A process for producing terpolymers of propylene (as a main monomer), ethylene and another .alpha.-olefin having superior and well-balanced physical properties, almost without forming soluble polymer is provided. This process is characterized by preliminarily activating a catalyst consisting of a titanium trichloride composition and a specified organoaluminum halide, with a small amount of an .alpha.-olefin of 2 to 12 carbon atoms, a trialkylaluminum and an aromatic ester, and copolymerizing specified amounts of propylene, ethylene and an .alpha.-olefin of 4 to 12 carbon atoms in the presence of the preliminarily activated catalyst obtained above.

Process for producing terpolymers of propylene, ethylene and another .alpha

A process for producing .alpha.-olefin polymers with a controlled stereoregularity and with a higher yield is provided, which process comprises: combining a TiCl.sub.3 -containing composition obtained by reducing TiCl.sub.4, with an organoaluminum compound; thereafter subjecting the composition to a polymerization treatment with an .alpha.-olefin; before, during or after the polymerization treatment, adding an electron donor or/and an electron acceptor or a reaction product of these two; as well as adding a reaction product of a trialkylaluminum with an electron donor having a specified molar ratio of the electron donor to the trialkylaluminum selected in the range of 0.01 to 5; and polymerizing an .alpha.-olefin in the presence of the resulting preactivated catalyst.

A method for producing .alpha.-olefin polymers is provided. This method provides products having superior properties such as higher bulk density and uniform particle form which is close to sphere, with such an extremely higher catalyst efficiency that ash-removal step can be omitted without fear of coloring. The characteristic point of this method is in the improvement of conventional catalyst obtained by reacting a trivalent metal halide with a divalent metal hydroxide, oxide or carbonate or a double salt containing foregoing compounds or a hydrate of a compound containing a divalent metal to form a solid product (I), reacting an electron donor with said product (I), reacting the resulting product with a compound of transition metal of the 4th a or the 5th a group to form a final solid product and combining an organoaluminum compound with said final product,

Method for producing .alpha.-olefin polymers

A process for producing .alpha.-olefin polymers characterized by employing an organomagnesium compound in the preparation of a preactivated catalyst therefor is provided. The resulting polymers have particularly a higher rigidity in addition to various superior properties. The process comprises reacting a trivalent metal halide with a divalent metal compound to obtain a solid product (I); reacting this product with an organomagnesium compound, an electron donor (ED) and an electron acceptor (EA), once to 10 times, and at that time, using TiCl.sub.4 at least once as the (EA) to obtain a solid product (II); combining this product with an organoaluminum compound (OAl) and an (ED), and at that time, subjecting a combination of (II) and (OAl) or that of (II), (OAl) and (ED) to polymerization treatment with an .alpha.-olefin, and in the case of the former combination, further adding (ED), to obtain a preactivated catalyst; and polymerizing .alpha.-olefin(s) in the presence of this catalyst.

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Ichiharashi, Japan

Kazutsune Kikuta