Asahi Kasei Kogyo Kabushiki Kaisha

Haruyuki Yoneda

Hisaya Sakurai

Katsuhiko Takaya

Isaburo Fukawa

Masayoshi Miya

Hideo Morita

Hiroshi Hachiya

Tadashi Ikegami

Stabilized aromatic polycarbonate composition and process for producing

A copolymer which can be employed for various molded articles, particularly for uses which require a high nonflammability, which copolymer is a crystalline aromatic polyketone type copolymer which has an intrinsic viscosity of not less than 0.40 and has a linear polymer structure comprising structural units (A) represented by the formula (A) ##STR1## structural units (B) represented by the formula (B) ##STR2## and structural units (C) represented by the formula (C.sub.1) ##STR3## or by the formula (C.sub.2) ##STR4## the molar ratio of said units (B) to said units (C) being in the range from 30:70 to 99:1, and the unit (A) and either the unit (B) or the unit (C) being linked alternately; and a process producing the same.

Crystalline aromatic polyketone copolymer produced from

Crystalline aromatic polyketones having a linear polymer structure comprising repeating units [I] of ##STR1## and repeating units [II] of ##STR2## the repeating units [I] and [II] are bonded alternately, and the polymer has an intrinsic viscosity of at least 0.4, has excellent properties, particularly heat resistance, and can be used as shaped articles, coatings, films, fibers, etc.

Crystalline aromatic polyketone and process for producing the same

A catalyst suitable for use in the polymerization of olefins is disclosed. This catalyst contains:

Catalyst for polymerization of olefins

Catalysts for polymerization of olefin which comprise a solid catalyst component (A) and an organometallic compound with a heterocyclic carboxylic acid ester (B), wherein the solid catalyst component (A) is obtained by reacting or/and grinding a special magnesium compound (1), a titanium halide (2) and a carboxylic acid ester (3); and the heterocyclic carboxylic acid ester is N-, S- or O-containing heterocyclic compound, and processes for polymerization of olefin employing such a catalyst.

A catalyst comprising (A) a solid catalyst component obtained by reacting a titanium compound having a hydrocarbyloxy group with an organoaluminum compound in the presence of an ether to give a liquid material or to give a solid titanium component (a) which is solubilized by addition of a tetravalent titanium halide with or without an ether without separation or after separation from the reaction mixture, and heat treating the liquid material at a temperature of 70.degree. to 180.degree. C. with or without addition of a tetravalent titanium halide, and (B) an organoaluminum compound is effective for polymerization or copolymerization of olefins with high stereoregularity and has high polymerization activity.

Catalysts for polymerization of olefin which comprise a solid catalyst component (A) and an organometallic compound with a heterocyclic carboxylic acid ester (B), wherein the solid catalyst component (A) is obtained by reacting or/and grinding an organomagnesium compound (1), of the formula

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Kurashiki, Japan

Haruyuki Yoneda