Teijin Limited

Jiro Sadanobu

Tsutomu Nakamura

Toyoaki Ishiwata

Susumu Honda

Kiyotsuna Toyohara

Takao Ohno

Akihiro Ohba

Shunichi Matsumura

Hiroo Inata

Keizo Shimada

Toru Sawaki

Nobuaki Kido

Yuzo Aito

Takashi Ito

Hideharu Sasaki

Toshitsugu Matsuki

Yorikazu Tamura

Seiji Itoh

Masatoshi Ozono

Shintaro Shimada

Masaaki Tsukioka

Rei Nishio

Tomonori Sakurai

Daisuke Ozaki

Tsugusi Yosida

Naoya Saito

Michio Yoshino

A polymetaphenylene isophthalamide-based polymer porous film having a satisfactory porous structure that exhibits excellent gas permeability and heat resistance. It is produced by a process which comprises casting a dope of the polymetaphenylene isophthalamide-based polymer and coagulating it in a coagulating bath. The porous film may also contain inorganic whiskers, and a composite porous film may be formed in combination with a separate thermoplastic polymer film.

Polymetaphenylene isophthalamide-based polymer porous film, process for its production and battery separator

An oriented polyimide film of high strength and a production process therefor. The process basically comprises stretching a gelled film and then imidating the film. The gelled film is formed by introducing a polyamic acid solution into a condensation agent solution. The gelled film is swollen with a solvent at the time of stretching.

Polyimide film and process for producing the same

Resin composition containing crystalline polyimide

Polymide/polyarylate resin composition and molded product thereof

A meta-type wholly aromatic polyamide containing, as principal repeating units, meta-phenylenediamineisophthalamide units is dissolved in an amide compound solvent; the resultant polymer solution is subjected to a wet-spinning procedure wherein the polymer solution is extruded in the form of filamentary streams into a coagulation bath containing an amide compound-containing solvent and water but substantially not containing salts, through spinning orifices of a spinneret, to coagulate the extruded filamentary polymer solution streams in the coagulation bath; the coagulated porous undrawn filaments are subjected to a drawing procedure wherein the porous undrawn filaments are drawn in a plasticizing drawing bath containing an aqueous solution of an amide compound solvent; the resultant drawn filaments are washed with water, and then heat-treated (for example, further drawn at a draw ratio of 0.7 to 4.0 while being heated at a temperature of 250 to 400&deg; C.), to provide uniform and dense meta-type wholly aromatic polyamide fibers.

Process for producing meta-type wholly aromatic polyamide filaments

An apparatus and a process for producing a laminate for electronic parts such as ceramic capacitors. After a predetermined pattern for forming an internal conductive layer is formed on a self-supporting green sheet which contains inorganic powder and an organic binder, the self-supporting green sheet is taken up by a columnar roll and laminated. At this point, the position of the same pattern on the green sheet G of the next cycle to be laminated adjacently onto the green sheet G of the previous cycle as the above pattern with respect to the predetermined pattern on the green sheet G taken up by the columnar roll is determined.

Process and apparatus for producing a laminate for electronic parts

Thermoplastic resin composition containing amorphous polyimide

Elastic fiber, process for the same and polyester elastomer used thereof

A polyamide comprising a solution of (i) an aliphatic polyamide and/or an aliphatic aromatic poly amide dissolved in (ii) N-methyl-2-pyrrolidone and containing (iii) calcium chloride, the ratio between the polyamide (i) and the N-methyl-2-pyrrolidone (ii) in the solution composition being 3 to 25% by weight of the polyamide (i)to 97 to 75% by weight of the N-methyl-2-pyrrolidone, (ii) with the solution also containing calcium chloride (iii) in an amount of 5 to 60 parts by weight based on 100 parts by weight of the polyamide (i) which can be precipitated in a precipitant consisting essentially of water while stirring the precipitant to provide fibrids, which then can be mixed with fibers or natural pulp and formed into synthetic paper.

Polyamide solution composition and methods for producing fibrids and

A poly(arylene ether ketone) of this invention principally comprises recurring units represented by formula ##STR1## wherein Ar.sup.1 denotes a 1,5-naphthalene ring, a 2,6-naphthalene ring, a 2,7-naphthalene ring or a combination of them, and Ar.sup.2 denotes p-phenylene, p,p'-biphenylene, a 1,5-naphthalene ring, a 2,6-naphthalene ring, a 2,7-naphthalene ring or a combination of them. The poly(arylene ether ketone) is high in second-order transition temperature and excellent in solvent resistance and moldability, and can be molded into heat-resistant fibers and electric insulating films.

Poly(arylene ether ketone), process for producing same and its use

A process is provided for the preparation of a pitch-based carbon fiber having a microstructure consisting of strip-like structural units extended in the longitudinal direction of the fiber, wherein the fractal dimension D of the arrangement of the strip-like structural units in the cross-section of the fiber has a fractal structure satisfying the requirement of the following formula (2) relatively to the observation scale r satisfying the requirement of the following formula (1) with respect to the cross-section of the fiber:

Process for the preparation of pitch-based carbon fiber

A pitch-based carbon fiber having a microstructure consisting of strip-like structural units extended in the longitudinal direction of the fiber, wherein the fractal dimension D of the arrangement of the strip-like structural units in the cross-section of the fiber has a fractal structure satisfying the requirement of the following formula (2) relatively to the observation scale r satisfying the requirement of the following formula (1) with respect to the cross-section of the fiber:

Pitch-based carbon fiber and process for preparation thereof

A process for the preparation of high-performance grade carbon fibers, which comprises attaching a fine powder of at least one member selected from oxides and carbides of silicon, aluminum, titanium, and boron to a precursor fiber bundle of as spun pitch fibers, subjecting the fiber bundle to an infusibilization treatment, and subjecting the fiber bundle to a carbonization treatment.

Process for preparation of high-performance grade carbon fibers

A process for producing an aromatic polyamide film, which comprises drawing an undrawn aromatic polyamide film biaxially at a draw ratio of at least 1.5 in a solvent mixture consisting of (a) 5% to 75% by weight of a good solvent of the aromatic polyamide and (b) 25% to 95% by weight of a non-solvent of the aromatic polyamide, and heat treating the drawn film, which contains at least 1% by weight, based on the weight of the film, of a good solvent of said aromatic polyamide, at a temperature of not lower than 150.degree. C. An m-phenyleneisophthalamide polymer film having extremely excellent dimensional stability under moist conditions, which film has a density d of from 1.35 to 1.41 g/cm.sup.3 and principal refractive indices n.sub..alpha., n.sub..beta. and n.sub..gamma. (n.sub..alpha. &gt;n.sub..beta. &gt;n.sub..gamma.) for D-line of a wavelength of 589 nm satisfying the following formula: ##EQU1##

Dimensionally stable poly-m-phenylene isophthalamide film

Growing community of inventors

Iwakuni, Japan

Jiro Sadanobu