Mitsui Toatsu Chemicals, Incorporated

Kuraray Co., Ltd.

Masanori Osawa

Masahiro Kouno

Kazumi Mizutani

Kohei Shizuka

Hiromi Nakano

Akihiro Yamaguchi

Akira Ito

Kenji Iwata

Heizo Sasaki

Toshihiro Toyoda

Motoo Kawamata

Akio Ohmory

Masayoshi Itoh

Tetsuya Iwao

Akitsugu Akiyama

Akio Matsuyama

Shoji Asano

Masahiro Kono

Hirotoshi Katsuoka

Aromatic polyamide having good high-temperature resistance and processing ability is obtained by specifying the ratio of storage modulus at the glass transition temperature (Tg).degree.C. to that of (Tg+100).degree.C.

Aromatic polyamide molded article having storage modulus

A polyamide and/or polyimide is prepared by using N,N'-dimethylethyleneurea or N,N'-dimethylpropyleneurea as a solvent upon polycondensation of a polycarboxylic acid and a diisocyanate at a temperature above 100.degree. C. in the presence of an alkali metal carbonate, alkali metal hydrogencarbonate, alkali metal hydroxide or an alkali metal salt of a polycarboxylic acid.

Catalytic preparation of polyamide or polyamide-polymide with

Disclosed herein is a process for preparing heat-resistant polymers by reacting an organic polyisocyanate with one or more compounds selected from the group consisting of organic polycarboxylic acids and organic polycarboxylic acid anhydrides in the presence of an alkali metal fluoride or an alkali metal fluoride combined with a quaternary onium salt as a catalyst.

Preparation process of heat-resistant polymers from polycarboxylic acids

Heat resistant organic fibers comprising a wholly aromatic polymer having amide group and/or imide group, said fibers having properties satisfying the following formulas

Heat resistant organic synthetic fibers and process for producing the

Preparation process of heat-resistant polymers from polycarboxcylic

Disclosed is a process for the preparation of polyamide compounds by reacting at least one polycarboxylic acid with at least one diisocyanate in the presence of a catalyst comprising at least one mono-alkali metal salt of dicarboxylic acid. The polyamide compounds prepared by this process have a substantially linear configuration and a high degree of polymerization and, therefore, are suitable for the manufacture of fibers, films and molded articles.

Process for the preparation of polyamide compounds by the reaction of

Disclosed is a catalyst for polymerizing .alpha.-olefins which comprises

Catalyst for polymerizing .alpha.-olefins

A catalyst for polymerizing .alpha.-olefins composed of a titanium composition formed by heating a co-comminuted mixture of a magnesium halide and a complex of an aluminum halide and a carboxylic acid ester of the formula R.sup.1 COOR.sup.2, with titanium tetra-chloride; and an organic aluminum compound of the formula AlR.sup.3 mH.sup.3 --m; and optionally added thereto at least one component selected from an alkyl aluminum halide of the formula AlR.sup.4 nX.sub.3 --n; a carboxylic acid ester of the formula R.sup.5 COOR.sup.6 ; and its complex formed with an aluminum halide; is disclosed.

Growing community of inventors

Yokohama, Japan

Masanori Osawa