Mitsui Toatsu Chemicals, Incorporated

Shuichi Morikawa

Toshiyuki Nakakura

Masahiro Ohta

Toshiaki Takahashi

Nobuhito Koga

Yoshihisa Gotoh

Toshihiko Tsutsumi

Atsushi Morita

Akihiro Yamaguchi

Hiroyasu Oochi

Katsunori Shimamura

Kayako Ito

Masaki Amano

Shoji Tamai

Taizo Nagahiro

Toshihiko Isutsumi

Nubohito Koga

A molding resin composition comprising 99.9 to 50% by weight of polyimide represented by the formula: ##STR1## and 0.1 to 50% by weight of polyether ketone resin and/or polyester resin, and more particularly comprising the polyester resin capable of forming an anisotropical molten phase at a temperature of 420.degree. C. or less, and a polyimide-based molding resin composition which comprises the said resins and other additives such as phenolic resin, fluororesin, graphite, carbon fibers, aromatic polyamide fibers, potassium titanate fibers and a crystallization accelerator, and is excellent in thermal resistance, chemical resistance, mechanical strength and processability.

Polyimide based resin composition

Polyimide based resin composition comprising cured phenolic resins and

Provided are carbon-fiber-reinforced polyimide resin compositions having excellent mechanical strength. The compositions are formed of (a) 5-50 parts by weight of carbon fibers, which have been obtained by coating starting carbon fibers at surfaces thereof with an aromatic polysulfone resin and then heating the thus-coated carbon fibers at 300.degree.-400.degree. C., and (b) 95-50 parts by weight of a polyimide resin which perferably have recurring units of following formula: ##STR1## wherein X represents a specific divalent radical and R represents a particular tetra-valent radical.

Carbon-fiber-reinforced polyimide resin compositions

A process for the production of polyimide fibers and polyimide fibers obtained by the process. The process includes thermal or chemical imidation of a polyamic acid which has been obtained by reacting a specific diamine and a particular tetracarboxylic dianhydride in the presence of a dicarboxylic anhydride represented by the following formula: ##STR1## wherein Z represents a divalent group selected from the group consisting of monocyclic aromatic groups, fused polycyclic aromatic groups and non-fused polycyclic aromatic groups with aromatic rings bonded together directly or via a crosslinking member.

Production process for polyimide fibers

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Kanagawa, Japan

Shuichi Morikawa