Zeon Corporation

Nippon Zeon Company, Ltd.

Yasuo Tsunogae

Shingo Okuno

Yasuhiro Wakizaka

Masato Sakamoto

Shigetaka Hayano

Kazunori Taguchi

Junji Kodemura

Yoshihisa Takeyama

Hiroyuki Nitadori

Takeshi Sugimura

Tohru Hosaka

Seiji Okada

Masaharu Tokoro

Kei Sakamoto

Wolfgang Anton Herrmann

Teiji Kohara

Tadao Natsuume

Shojiro Kaita

Daisuke Uchida

Toshihide Murakami

Satoshi Kiriki

Keisuke Ohta

Atsushi Ishiguro

The Ban Hoang

Fumiaki Bando

Yoshitsugu Hirokawa

Shintaro Ikeda

Hiroshi Kurakata

Masahiro Ichinose

Yoshiharu Shimokawa

Naoaki Kuramoto

Shin-ichiro Tahara

Hideharu Mizuno

Mitsushi Tada

Mitsuteru Endo

Yasuhiro Wakisaka

Masami Kitaoka

Kei Nishii

Sigetaka Hayano

Karl Oefele

Hitomi Takeuchi

Takashi Iga

A ring-opened copolymer including structural units derived from a norbornene compound having a specific structure and structural units derived from a monocyclic olefin, wherein the proportion of the structural units derived from a norbornene compound is 25 to 90 wt % and the proportion of the structural units derived from a monocyclic olefin is 10 to 75 wt % relative to the total repeating structural units in the ring-opened copolymer, the weight average molecular weight of the ring-opened copolymer is 100,000 to 1,000,000, and the cis/trans ratio of the ring-opened copolymer is 0/100 to 50/50.

Ring-opened copolymer

A ring-opened copolymer composition has a ring-opened copolymer containing structural unit derived from a norbornene compound represented by general formula (1) below and structural unit derived from a monocyclic olefin, wherein a content of a norbornene compound represented by general formula (1) is 1 ppm by weight or more and 1000 ppm by weight or less based on the ring-opened copolymer, wherein Rto Rare each a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a substituent containing a halogen atom, a silicon atom, an oxygen atom or a nitrogen atom, and Rand Rmay be bonded to each other to form a ring, and 'm' is 0 or 1.

Ring-opening copolymer composition

A crosslinkable composition containing: a liquid monocyclic olefin ring-opened polymer (A) having a reactive group at a polymer chain end thereof and a weight-average molecular weight (Mw) of 1,000 to 50,000; and a crosslinkable compound (B) having, in the molecule, two or more functional groups reactive with the reactive group at the polymer chain end of the monocyclic olefin ring-opened polymer (A).

Crosslinkable composition and crosslinked product

A liquid cyclopentene ring-opened copolymer includes a monomer unit derived from cyclopentene and a monomer unit derived from a norbornene compound, the monomer unit derived from cyclopentene being present in an amount of 60 to 95 wt %, the liquid cyclopentene ring-opened copolymer having a hydroxyl group-terminated copolymer chain and having a melt viscosity at 25&#xb0; C. of less than 500 Pa&#xb7;s, which is measured using a B-type viscometer.

Liquid copolymer formed by ring-opening copolymerization of cyclopentene, crosslinkable composition, and crosslinked rubber object

A rubber composition that contains 0.1 to 50 parts by weight of an organic peroxide with respect to 100 parts by weight of a cyclopentene ring-opening polymer.

Rubber composition and crosslinked rubber

A cyclopentene ring-opening copolymer having a branch structure contains a structure in which at least four cyclopentene ring-opening polymer chains are linked via a branch-structural unit. At least part of the cyclopentene ring-opening polymer chains is terminally modified.

Cyclopentene ring-opening copolymer and method of producing the same

A rubber composition containing: a solid rubber (A) having a weight-average molecular weight (Mw) of 100,000 or more; and a liquid monocyclic olefin ring-opened polymer (B) having a weight-average molecular weight (Mw) of 1,000 to 50,000, wherein a proportion of the liquid monocyclic olefin ring-opened polymer (B) is 1 to 100 parts by weight per 100 parts by weight of the solid rubber (A).

Rubber composition and rubber crosslinked product

A crosslinked rubber is produced by crosslinking a polymer composition containing 100 parts by weight of a rubber component containing a cyclopentene ring-opening polymer and 20 to 200 parts by weight of carbon black, wherein, when the crosslinked rubber is subjected to an ozone treatment in which the rubber is maintained at 40&#xb0; C. and an ozone concentration of 50 pphm for 144 hours under a 20% tensile strain, the crosslinked rubber shows a rate of change in tensile strength before and after ozone treatment of within &#xb1;70%.

Crosslinked rubber

A crosslinked rubber is a member for use in an environment at &#x2212;10&#xb0; C. or less produced by crosslinking a polymer composition containing 20 to 200 parts by weight of carbon black with respect to 100 parts by weight of a rubber component containing a monocyclic olefin ring-opening polymer having a proportion of cis bond of a structural unit derived from a monocyclic olefin of 45 to 95%.

Use of crosslinked rubber

[Problem] To provide a cyclopentene ring-opening copolymer used in a rubber composition for tires having excellent wet grip performance and low heat buildup; and a method for producing the cyclopentene ring-opening copolymer. To further provide a rubber composition obtained by using the cyclopentene ring-opening copolymer. [Solution] This cyclopentene ring-opening copolymer comprises cyclopentene and a cyclic olefin containing an aromatic ring; the content of the aromatic ring with respect to the total weight of the copolymer is 10 to 40 wt %; and the weight average molecular weight (Mw) is 200,000 to 1,000,000. The cyclopentene ring-opening copolymer alternatively comprises cyclopentene and a norbornene compound; the weight ratio of cyclopentene-derived structural units to all repeating structural units in the copolymer is 40 to 90 wt %, and the weight ratio of norbornene compound-derived structural units is 10 to 60 wt %; and the weight average molecular weight (Mw) is 200,000 to 1,000,000.

Cyclopentene ring-opening copolymer, method for producing same, and rubber composition

A cyclopentene ring-opening polymer having, at a polymer chain end, a structure where a polymer chain and a group containing an alkoxysilyl group are bonded through &#x2014;NH&#x2014; and having a weight average molecular weight of 100,000 to 1,000,000, wherein the structure is a structure represented by the following general formula (1):pCP&#x2014;Y1-NH&#x2014;Y2-Si(OR1)a(R2)3-a&#x2003;&#x2003;(1)where, in the general formula (1), pCP represents a cyclopentene ring-opening polymer chain, Y1 represents a bivalent hydrocarbon group having 1 to 20 carbon atoms, each of R1 and R2 represents a hydrocarbon group having 1 to 20 carbon atoms, Y2 represents a bivalent hydrocarbon group having 1 to 20 carbon atoms in which &#x2014;NH&#x2014; may be interposed, and 'a' is an integer of 1 to 3.

Cyclopentene ring-opening polymer and method of production of same, polymer composition, and cross-linked polymer

The present invention is a polyether-based polymer composition includes: a polyether-based polymer including an oxirane monomer unit and having one cationic group substantially only at one terminal of a polymer chain, and a nanocarbon material. The polyether-based polymer composition of the present invention can be suitably used, for example, as a bucky gel or as a master batch for preparing a nanocarbon material aqueous dispersion in which a nanocarbon material is favorably dispersed.

Polyether-based polymer composition

A cycloolefin rubber having a weight average molecular weight of 100,000 to 800,000, having a silyl group at the polymer chain end, and containing a fatty acid ester of a polyvalent alcohol. A cycloolefin rubber excellent in processability at the time of blending and kneading and excellent in low heat buildup property can be provided.

Cycloolefin rubber and method of production of same and rubber composition, cross-linked rubber, and tire

The present invention pertains to: a polymerizable composition comprising a cycloolefin-based monomer represented by a formula (I), and a polymerization catalyst, wherein Ris a hydrocarbon group having 1 to 10 carbon atoms, a halogen atom, etc, m is an integer from 0 to 6n+6, and n is an integer from 1 to 3. As a result of the present invention, a polymerizable composition that is useful as a material for producing a cycloolefin-based resin formed article that exhibits excellent adhesion to a metal, a cycloolefin-based polymer obtained from the polymerizable composition, a cycloolefin-based resin formed article, and a laminate that includes a metal foil and a cycloolefin-based resin layer that is situated adjacent to the metal foil are provided. 

Polymerizable composition, cycloolefin-based polymer, cycloolefin-based resin molded body, and laminate

A polyether compound containing oxirane monomer units in an average number per molecule of 10 to 100, wherein the polyether compound contains repeating units which are represented by the general formula (2) as at least part of the oxirane monomer units is provided. According to the present invention, it is possible to provide a polymer material which has suitable fluidity and is excellent in ion conductivity. 

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Tokyo, Japan

Yasuo Tsunogae