Mitsui Chemicals, Inc.

Dow Corning Toray Company, Ltd.

Atsushi Sakuma

Munehito Funaya

Akiko Matsumoto

Hirokazu Tanaka

Ikuko Ebisawa

Shinsuke Kinoshita

Shinya Tanaka

Tomoyuki Ando

Tsugio Nozoe

Hironori Komatsu

Toshihiro Oikawa

Hiroaki Yoshida

Hiroki Ishibashi

Yasushi Fukuiri

Toshifumi Yamaki

Hideki Umetani

Hitoki Miyake

Kazuhiko Togashi

Yuichi Tsuji

Tsuyoshi Inoue

Takeshi Nakamura

Kazutaka Tsuru

Kenichiro Okamura

Fumitaka Suto

The purpose of the present invention is to provide a propylene-based block copolymer, the deposition thereof on the inner wall of the polymerization vessel having been sufficiently inhibited. The propylene-based block copolymer of the present invention has a flowability evaluation value of 40% or less, the value being calculated with the following equation wherein X (sec) is the number of seconds over which 100 g of the copolymer having ordinary temperature falls from a stainless-steel funnel having an inner diameter of 11.9 mm and Y (sec) is the number of seconds over which 100 g of the copolymer which has been held at 80&#xb0; C. for 24 hours under a load of 10 kg falls from the funnel having an inner diameter of 11.9 mm.Flowability evaluation value (%)={()&#x2212;1}&#xd7;100.

Propylene-based block copolymer, production method therefor, and solid titanium catalyst ingredient for olefin polymerization

[Problem to be solved] There is provided a process for producing an olefin polymer that is capable of producing an olefin polymer having high heat resistance and high molecular weight with excellent catalytic activity. [Solution to problem] The process for producing an olefin polymer includes a step of polymerizing at least one olefin selected from ethylene and &#x3b1;-olefins having 4 to 30 carbon atoms in the presence of an olefin polymerization catalyst containing a transition metal compound represented by the general formula [I], the olefin polymer including constituent units derived from ethylene and &#x3b1;-olefins having 4 to 30 carbon atoms in a total amount between more than 50 mol % and not more than 100 mol %, 

Process for producing olefin polymer and olefin polymer

[Problem to be solved] There is provided a process for producing an olefin polymer that is capable of producing an olefin polymer having high heat resistance and high molecular weight with excellent catalytic activity. [Solution to problem] The process for producing an olefin polymer includes a step of polymerizing at least one olefin selected from ethylene and &#x3b1;-olefins having 4 to 30 carbon atoms in the presence of an olefin polymerization catalyst containing a transition metal compound represented by the general formula [I], the olefin polymer including constituent units derived from ethylene and &#x3b1;-olefins having 4 to 30 carbon atoms in a total amount between more than 50 mol % and not more than 100 mol %,  [in the formula [I], R, Rand Rto Rare each independently a hydrogen atom, a hydrocarbon group or the like; Ris a hydrocarbon group or the like; Ris a hydrogen atom; M is a transition metal of Group IV; Q is a halogen atom or the like; and j is an integer of 1 to 4].

There is provided a process for producing an olefin polymer that is capable of producing an olefin polymer having high heat resistance and high molecular weight with excellent catalytic activity. The process for producing an olefin polymer includes a step of polymerizing at least one olefin selected from ethylene and &#x3b1;-olefins having 4 to 30 carbon atoms in the presence of an olefin polymerization catalyst containing a transition metal compound represented by the general formula [I], the olefin polymer including constituent units derived from ethylene and &#x3b1;-olefins having 4 to 30 carbon atoms in a total amount between more than 50 mol % and not more than 100 mol %,  [in the formula [I], R, Rand Rto Rare each independently a hydrogen atom, a hydrocarbon group or the like; Ris a hydrocarbon group or the like; Ris a hydrogen atom; M is a transition metal of Group IV; Q is a halogen atom or the like; and j is an integer of 1 to 4].

A multipackage sponge-forming liquid silicone rubber composition that characteristically comprises at least (A) an alkenyl-containing polydiorganosiloxane comprising (A1) a polydiorganosiloxane that has alkenyl groups on both molecular chain terminals and that does not contain alkenyl groups in the side chains on the molecular chain, and (A2) a polydiorganosiloxane that has at least two alkenyl groups in the side chains on the molecular chain; (B) an organopolysiloxane that has at least two silicon-bonded hydrogen atoms in each molecule; (C) a mixture comprising water and an inorganic thickener; (D) an emulsifying agent; (E) a hydrosilylation reaction catalyst; and (F) a cure retarder; and is stored as a plurality of separate compositions wherein none of this plurality of separately stored compositions contain both component (A) and component (C), none of this plurality of separately stored compositions contain both component (B) and component (C), and none of this plurality of separately stored compositions contain both component (B) and component (E).

Multi-component sponge-forming liquid silicone rubber composition and silicone rubber sponge manufacturing method

The present invention relates to a process for producing a molded silicone rubber sponge by filling a sponge-forming silicone rubber composition into a cavity of a mold, wherein after the aforementioned sponge-forming silicone rubber composition is cured, and before mold opening of the aforementioned mold, gas present in the aforementioned cavity is discharged. Thereby, a molded silicone rubber sponge without damage such as chips or the like can be effectively produced.

Process for producing molded silicone rubber sponge

[Problem] To provide a preparation process by which an organic alkali metal compound is obtained in a high yield and a process for preparing an organic transition metal compound using the organic alkali metal compound. [Means to solve the problem] A process for preparing an organic alkali metal compound, which is characterized by adding a compound represented by the following formula (2) in the reaction of an active proton-containing compound represented by the following formula (1) with an alkali metal compound.RH&#x2003;&#x2003;(1) In the formula (1), R is a hydrocarbon group or an amino group and may contain a halogen atom, a silicon atom, an oxygen atom or a nitrogen atom, H is an active proton, and p is the number of hydrogen atoms abstracted in the reaction with the alkali metal compound.  In the formula (2), Rto Rare each an atom or a group selected from a hydrogen atom, a hydrocarbon group, a heteroatom-containing group and a silicon-containing group and may be the same as or different from each other, and the neighboring substituents may be bonded to each other to form a ring.

Process for preparing organic alkali metal compound and organic transition metal compound

A novel gluconate dehydratase derived fromand a gene encoding the gluconate dehydratase are provided. By reacting the gluconate dehydratase or a transformed cell containing the gene with an aldonic acid, the corresponding 2-keto-3-deoxyaldonic acid can be efficiently produced.

Gluconate dehydratase

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Hatsukaichi, Japan

Atsushi Sakuma