Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Kuraray Co., Ltd.

Masahiro Kouno

Kazumi Mizutani

Tetsunosuke Shiomura

Yoshiho Sonobe

Norihide Inoue

Masanori Osawa

Kohei Shizuka

Tadahito Nobori

Usaji Takaki

Hiromi Nakano

Akihiro Yamaguchi

Toshiaki Suzuki

Shinji Kiyono

Nobuhiro Hirayama

Tadashi Asanuma

Akira Ito

Akio Ohmory

Kenji Iwata

Ryuichi Sugimoto

Akitsugu Akiyama

Akio Matsuyama

Shoji Asano

Heizo Sasaki

Toshihiro Toyoda

Hirotoshi Katsuoka

Tsutomu Iwatani

A salt useful as an active species in an organic reaction and represented by the following chemical formula (1):wherein n stands for an integer of from 1 to 8, Zrepresents an n-valent anion of an active hydrogen compound, a, b, c and d each stands for a positive integer, and Rs represent the same or different hydrocarbon groups. In addition, a simple and efficient process is provided for producing a poly(alkylene oxide) by polymerizing an alkylene oxide compound in the presence of the salt represented by the chemical formula (1).

Poly (alkylene oxide) prepared in the presence of a phosphazenium salt or compound

A catalyst for the polymerization of an alkylene oxide compound is disclosed. This catalyst is composed of a phosphazene compound or a phosphazenium salt which is derived from the phosphazene compound and an active hydrogen compound. A poly(alkylene oxide) can be efficiently produced by polymerizing the alkylene oxide compound in the presence of the catalyst and, when the catalyst is composed of the phosphazene compound, the active hydrogen compound. The poly(alkylene oxide) contains no metal component and compared with those produced using conventional amine-base catalysts, has also been improved significantly in odor.

Process for production of propylene oxide/ethylene oxide block copolymers

A salt useful as an active species in an organic reaction and represented by the following chemical formula (1): ##STR1## wherein n stands for an integer of from 1 to 8, Z.sup.n- represents an n-valent anion of an active hydrogen compound, a, b, c and d each stands for a positive integer, and Rs represent the same or different hydrocarbon groups. In addition, a simple and efficient process is provided for producing a poly(alkylene oxide) by polymerizing an alkylene oxide compound in the presence of the salt represented by the chemical formula (1).

Phosphazenium salt and preparation process thereof, and process for

Polymerization catalyst for alkylene oxide compound and production

Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or absence of an organoaluminum compound. A hydrogen partial pressure of a gas phase in the reaction vessel, said gas phase being formed of the propylene and hydrogen, is maintained at 10% or higher. The solid catalyst is formed of a transition metal compound or a reaction product between the transition metal compound and an organometallic compound, an aluminoxane and a fine particulate carrier. Also described herein is a heating-roll fixing type toner composition composed essentially of a binder resin or a binder resin composition, a colorant and, as a releasing agent, the wax.

Syndiotactic polypropylene wax, production process thereof, and heating

A method for preparing an ethylene copolymer which comprises the step of copolymerizing ethylene with an aromatic vinyl compound in the presence of a catalyst comprising (A) a specific transition metal compound represented by the formula I ##STR1## and (B) a cocatalyst such as an aluminoxane.

Method for preparing ethylene copolymer

A novel transition metal compound represented by the formula ##STR1## (wherein each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A.sup.5 is a hydrocarbondiylidene group having 4 to 30 carbon atoms; a pair of A.sup.1 and A.sup.2 as well as a pair of A.sup.3 and A.sup.4 is respectively bonded to the identical carbon atom in A.sup.5 to form a crosslinking structure; each of R.sup.1 and R.sup.2 is a halogen atom, a hydrogen atom, an alkyl group or a silicon-containing alkyl group having 1 to 10 carbon atoms, an aryl group, an alkylaryl group, an arylalkyl group or a halogenated aryl group having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 may be identical or different; each of M.sup.1 and M.sup.2 is titanium, zirconium or hafnium; and M.sup.1 and M.sup.2 may be mutually identical or different), and a method for polymerizing an olefin in the presence of this compound and a co-catalyst. The employment of the combination of the above-mentioned compound and another known transition metal compound as the transition metal compounds permits preparing a polyolefin having a wide molecular weight distribution.

Method of polymerizing an olefin using a novel transition metal compound

A method for preparing a propylene (co)polymer having a substantially high syndiotactic structure and a desired molecular weight which comprises the step of (co)polymerizing propylene or propylene and a small amount of another olefin by the use of a transition metal compound catalyst having asymmetric ligands in the presence of a specific internal olefin.

Method for preparing syndiotactic polypropylene

Transition metal compound having two transition metal atoms in one

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

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Kanagawa-ken, Japan

Masahiro Kouno