Sekisui Chemical Co., Ltd.

California Institute of Technology

Polyplastics Co., Ltd.

Topas Advanced Polymers Gmbh

Seikisui Chemicals Co., Ltd.

Takeharu Morita

Robert H Grubbs

Hiroyuki Katayama

Bob R Maughon

Katsunori Toyoshima

Shoji Nozato

Wilfried Hatke

Tetsuya Aita

Takeshi Wakiya

Hajime Serizawa

Akinobu Hayakawa

Hiroshi Hiraike

Fumiyuki Ozawa

Nobuhiro Goto

Isao Higuchi

Hiroshi Yoshitani

Toshio Tada

Takahiko Sawada

Hiroyuki Kanai

Tomohito Uno

Anne-Meike Schauwienold

Motohiko Asano

Tetsuya Kurebayashi

Yuuichirou Fukumoto

Matthias Bruch

Udo Manfred Stehling

Kazunari Yagi

Katsutoshi Nagai

Tatsuo Taniguchi

Youhei Nishimura

Masafumi Nakatani

A novel cycloolefin copolymer that can be employed in the production of molding with fewer defects, for example, fewer gel particles (fish eyes). There is provided a cycloolefin copolymer comprising 80 to 20 mol % of repeating units derived from an &#x3b1;-olefin monomer and 20 to 80 mol % of repeating units derived from at least one cycloolefin monomer selected from the group consisting of monomer of the general formula (I), monomer of the general formula (II), monomer of the general formula (III), monomer of the general formula (IV) and monomer of the general formula (V), wherein with respect to the repeating units derived from cycloolefin monomer, the proportion thereof being present in the form of dimer (Rd) is 50 mol % or below and the proportion thereof being present in the form of trimer (Rt) 5 mol % or above.

Cycloolefin copolymer

The present invention relates to a zero-valent transition metal complex which can be used as a starting material for producing a catalyst usable for producing a polyolefin by ring-opening metathesis polymerization of an olefin and an epothilone by ring-closing metathesis reaction, and a method for efficiently producing, at low cost, an organometallic compound useful as a catalyst, using the zero-valent transition metal complex as a starting material. Provided is a method for producing a zero-valent transition metal complex (C), which comprises reacting a divalent transition metal complex (A) with an olefin (B), the complex (A) being selected from the group consisting of a divalent ruthenium complex (A) and a divalent osmium complex (A), thereby obtaining a zero-valent transition metal complex (C), wherein the reaction is conducted under reducing conditions and after the reaction, the resultant crude product is extracted at high temperature using a saturated hydrocarbon as an extracting solvent. Also provided is a method for producing an organometallic compound, which comprises reacting the metal complex (C) with a specific compound (D) and a neutral ligand (E) in one step.

Zero-valent transition metal complex and method for producing an organometallic compound using the same as a starting material

It is an object of the invention to provide coated particles excellent in the reliability of connection. The invention provides coated particles each comprising a metal-surfaced particle as a core and resulting from a partial surface modification of that core particle with an organic compound via a functional group (A) capable of binding to a metal.

Coated particles

This invention provides a method for producing a polymer alloy, a polymer alloy as well as a molded article, a transparent molded article and an optical film, which is obtainable by using the polymer alloy. The invention is a method for producing a polymer alloy, which comprises at least: a stepof mixing two or more resins incompatible with each other at ambient temperature and pressure with a solvent being in a liquid or gas state at ambient temperature and pressure; a stepof heating and applying pressure to said solvent into a high-temperature and high-pressure fluid or a supercritical fluid and mixing the solvent in this state; and, a stepof cooling the mixture obtained in said steprapidly to the glass transition temperature or less without releasing the pressure of the mixture.

Method for producing polymer alloy polymer alloy formed article transparent formed article and optical film

A method for synthesizing an organometallic compound, which is usefully utilized as a catalyst for manufacturing polyolefins by ring-opening metathesis polymerization of an olefin having strain in a molecule such as dicyclopentadiene or synthesizing epothilones by ring-dosing metathesis reaction, by an efficient and low cost synthesis method using a starting material which is easily available due to relatively simple chemical structure, and further without any possibility of coexistence of a vinylhetero compound or a vinyl compound exchanged which tends to accompany as an impurity in the system in conventional methods, characterized by reacting a starting material comprising a zero-valent transition metal complex (A) or a polyvalent transition metal complex (A'), a compound (B) or (B&#x2032;) shown by the following general formula (1) or (4), respectively, and a neutral ligand (C) or (C&#x2032;), in one step under non-reducing condition or reducing condition.RYCRX&#x2003;&#x2003;(1)RYCRX&#x2003;&#x2003;(4)

Process for synthesis of organometallic compounds

The present invention relates to telechelic polymers having crosslinkable end groups of the formulaand methods for preparing the same wherein n is an integer;is an alkadienyl group; Y is an alkyl group; and Z is crosslinkable end group. In general, the inventive synthesis involves reacting a functionalized chain transfer agent having crosslinkable ends with a cycloalkene in the presence of a ruthenium or osmium catalyst of the formulawherein:

Telechelic alkadiene polymers with crosslinkable end groups and methods for making the same

A melt-moldable, thermoplastic norbornene resin composition characterized by being obtained by compounding (A) a base polymer comprising a thermoplastic norbornene resin with (B) an olefin compound having a number-average molecular weight of 200 to 10,000 and a softening point of 70 to 170&#xb0; C.; and a molded article or optical film obtained by melt-molding or extrusion-molding the thermoplastic norbornene resin composition.

Melt-moldable thermoplastic norbornene resin composition and molded article and optical film both comprising the same

It is an object of the present invention to provide a polymerizable composition and a cured resin composition, linear expansion coefficients of which are significantly improved without impairment of the excellent properties such as heat resistance, mechanical strength and the like of norbornene-based resins. The present invention is a polymerizable composition, which comprises a polymerizable substance containing a norbornene-based monomer or oligomer as a main component, a metathesis polymerization catalyst and silica powder, the weight content of the silica powder being larger than the weight content of the polymerizable substance.

Polymerizable composition and cured resin composition

The present invention provides an organometallic compound represented by the general formula (1) or (2), process for producing the same, metathesis reaction catalyst containing the same, polymerization process using the same catalyst and polymer produced by the same polymerization process:

ORGANOMETALLIC COMPOUND HAVING HIGH METATHESIS ACTIVITY AND METHOD FOR PREPARATION THEREOF, METHATHESIS REACTION CATALYST COMPRISING THE COMPOUND, METHOD OF POLYMERIZATION USING THE CATALYST, AND POLYMER PRODUCED BY THE METHOD OF POLYMERIZATION

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Osaka, Japan

Takeharu Morita