Mitsui Chemicals, Inc.

Mitsui Petrochemical Industries, Ltd.

Other

The Lubrizol Corporation

Shin-etsu Chemical Co., Ltd.

Nippon Oil Fats Co., Ltd.

Masaaki Kawasaki

Tetsuo Tojo

Keiji Okada

Hidenari Nakahama

Takashi Hakuta

Toshiyuki Tsutsui

Takashi Ueda

Junichi Imuta

Mikio Hashimoto

Yoshihisa Kiso

Akira Mizuno

Toshihiro Sagane

Daisuke Fukuoka

Taku Koda

Junji Saito

Mikio Hosoya

Yoshiharu Kikuchi

Kyoko Kobayashi

Tsutomu Nakamura

Takeo Yoshida

Satoru Moriya

Toshimasa Takata

Yuji Ishii

Masaaki Yasuda

Mitsunao Arino

Hidetatsu Murakami

Shuichi Nonaka

Takasi Ueda

Keiji Hirose

Satoshi Ikeda

Akira Uchiyama

Kotaro Ichino

Noriaki Kihara

Yuichi Itoh

Satao Hirabayashi

Shuji Minami

Takashi Tashiro

Koji Kawaai

Ryousuke Kaneshige

Kazuhiko Murata

Kazuyuki Takimoto

Tokinori Agou

Tatsuyoshi Ishida

Tatsuya Tanizaki

Hitomi Matsuzaki

Mitsuhiko Onda

Masaaki Itoh

Hitoshi Onishi

Akira Yamamoto

Terunori Fujita

Masahiro Ishidoya

Hiroaki Sakaguchi

Masahide Tanaka

Masahiro Sugi

Kishio Shibato

Syuji Minami

Tetsuhiro Matsumoto

Osamu Ohe

Kenichi Morizono

Takashi Abe

Katsuya Takahashi

Shinya Matsunaga

Junichi Yoshitake

Akihiro Matsuda

Kaoru Ueno

Hiroaki Kitani

Keiji Watanabe

Mitsuko Nagai

Atsuo Kobata

Makoto Kamimura

Masao Kunizane

Ken Maeda

Yasuhiro Hosomi

Tomoko Sueyoshi

Kiyoshi Honma

Akemi Uchimi

Masaki Sugawara

Takami Nishikawa

Takamasa Tsumoto

Kenzaburo Fukutani

Yoshio Miyake

Totshiyuki Tsutsui

Hiroshi Kameda

Yuji Miura

Yoshio Maejima

Masao Kishi

Michio Sekine

A lubricating oil composition for a power transmission system, which is excellent in both of low-temperature viscosity property and shear stability, is provided. The viscosity modifier of a lubricating oil for a power transmission system according to the present invention comprises an ethylene/&#x3b1;-olefin copolymer (B) having the properties: (B1) an ethylene content in the range of 70 to 85% by mol, (B2) an intrinsic viscosity [&#x3b7;] in the range of 0.2 to 1.0 dl/g, (B3) Mw/Mn not more than 2.4, and (B4) a melting point, as measured by DSC, not higher than 60&#xb0; C., or no melting point observed.

Viscosity modifier of lubricating oil for power transmission system and lubricating oil composition for power transmission system

The present invention provides a vulcanized foamed rubber molded product which has surface smoothness equal to or higher than that of a non-foamed vulcanized rubber molded product, has excellent mechanical strength properties, compression set resistance and abrasion resistance and a non-foamed vulcanized rubber molded product which is superior in surface smoothness to a conventional non-foamed vulcanized rubber molded product and has excellent compression set resistance, mechanical strength properties and abrasion resistance, as well as a method of producing the same. The molded product of the present invention is characterized in that the amount of sulfur atoms present in the surface thereof is at least 1.2 times as high as the amount of sulfur atoms present in a cut face obtained by cutting the surface to a depth of 1.0 mm in the vertical direction. The method of producing comprises allowing droplets or spray of a liquid containing an elementary substance consisting of a non-oxygen element in the group VI in the periodic table to adhere to the surface of a non-vulcanized rubber composition containing an elemental sulfur and/or a sulfur compound as a crosslinking agent, and then vulcanizing or vulcanizing and foaming the composition.

Vulcanized rubber molded product, method of producing the same, and use of the molded product

The present invention provides a lubricating oil composition having excellent low temperature viscosity properties suitable for engine oils for automobiles and industries, gear oils, shock absorber oils, hydraulic fluids and it also provides a lubricating oil for internal-combustion engines formed from the composition. The lubricating oil composition comprises;

Lubricating oil composition and internal combustion engine oil

The crosslinkable rubber composition of the invention is crosslinkable by hot air, and a hot-air crosslinked rubber sheet thereof has no scratch on the surface in a hardness test using a pencil of HB and has a compression set of not more than 70% after a heat treatment at 150&#xb0; C. for 22 hours. The rubber composition comprises an ethylene/&#x3b1;-olefin/non-conjugated polyene random copolymer rubber comprising a specific vinyl end group-containing norbornene compound, a SiH group-containing compound having at least two SiH groups in one molecule, and if necessary, an addition reaction catalyst comprising a platinum group element and a reaction inhibitor.

Crosslinkable rubber compositions and uses thereof

The curable composition of the present invention contains (A1) a silyl-containing ethylene/&#x3b1;-olefin/non-conjugated polyene random copolymer rubber which has a structural unit derived from a norbornene compound as the non-conjugated polyene with at least one specific vinyl group at the terminal and contains a specific hydrolyzable silyl group, and (B) a compound, other than the rubber (A1), having a hydroxyl group and/or a hydrolyzable group, e.g., (B1) a compound having a silanol group and/or a compound which can react with moisture to form a compound having a silanol group in the molecule. This compound improves elongation of the cured product and residual surface tackiness, and, at the same time, is high in curing speed and capable of giving the cured product of high resistance to weather. It is suitable for, e.g., adhesives, tackifiers, paints, sealants, waterproof materials, spray materials, shaping materials and casting rubber materials.

Curable composition and its use

A silicon-containing olefin copolymer is provided which comprises (a) a constituent unit derived from &#x2014;CH&#x2014;CH&#x2014; such as ethylene, (b) a constituent unit derived from &#x2014;CH&#x2014;CHR&#x2014; where R is a hydrocarbon group of 1 to 18 carbon atoms, and (c) a constituent unit containing a specific silicon-containing group. A silicon-containing olefin copolymer is also provided which is obtainable by co-polymerizing ethylene, an a-olefin of 3 to 20 carbon atoms and a specific silicon-containing ethylene monomer.

Silicon-containing olefin copolymer, crosslinkable rubber composition thereof, and use thereof

This invention relates to a composition comprising (A) an ethylene-&#x3b1;-olefin having 3 to 20 carbon atoms-non-conjugated polyene copolymer, (B) a specific fine-powdered silicic acid and/or a silicate having a specific surface area of 5 to 500 m/g (BET adsorption amount: ISO 5794/1, Annex D), (C) at least one kind of &#x3b1;,&#x3b2;-unsaturated carboxylic acid metal salts, (D) an organic peroxide, further optionally (E) one antioxidant selected from sulfur-containing antioxidants, phenolic antioxidants and amine antioxidants, and/or (F) sulfur, and this invention relates to a rubber product obtainable by crosslinking the above composition.

Rubber compositions and their uses

A propylene polymer composition is prepared by mixing propylene homo- or co-polymer (A) obtained using a transition metal catalyst compound (h), defined herein, with a co-catalyst, e.g., organoaluminum oxy compound, with an olefin elastomer (D) and another olefin polymer (E), e.g., polyethylene. Alternatively, the combination of propylene polymer (A), olefin elastomer (D) and olefin polymer (E) is prepared by a multi-stage polymerization method. In both cases, the propylene homo- or co-polymer (A) may include a second propylene homo- or co-polymer (A') wherein the ratio of intrinsic viscosities of propylene polymers (A) and (A&#x2032;) is in the range of 3 to 30. These propylene polymer compositions are excellent in heat resistance, mechanical strength, tensile elongation at break, etc., and can be used in the fabrication of structural materials, films and sheets.

Propylene polymer compositions

The crosslinkable rubber composition of the invention is crosslinkable by hot air, and a hot-air crosslinked rubber sheet thereof has no scratch on the surface in a hardness test using a pencil of HB and has a compression set of not more than 70% after a heat treatment at 150&#xb0; C. for 22 hours. The rubber composition comprises an ethylene/&#x3b1;-olefin/non-conjugated polyene random copolymer rubber comprising a specific vinyl end group-containing norbornene compound, a SiH group-containing compound having at least two SiH groups in one molecule, and if necessary, an addition reaction catalyst comprising a platinum group element and a reaction inhibitor. The automobile weatherstrip, hose, rubber vibration insulator, belt, sealing material, expanded product, covered electric wire, electric wire joint, electric insulating part and household rubber product according to the invention comprise the above-mentioned rubber composition. The rubber composition has a high crosslinking rate and excellent productivity to produce crosslinked rubber molded products, is capable of undergoing hot-air crosslinking such as HAV or UHF and is capable of providing crosslinked rubber molded products having excellent compression set resistance, strength properties, heat resistance, weathering resistance and abrasion resistance.

Crosslinkable rubber compositions and use thereof

A propylene polymer composition comprising a propylene polymer prepared by using a zirconocene catalyst having two aryl-substituted indenyl group and having a melt flow rate (MFR) of 0.01 to 30 g/10 min and a second propylene polymer prepared by using a zirconocene catalyst having a melt flow rate (MFR) of 30 to 1,000 g/10 min and, if desired, a soft polymer, a ratio of the MFR of the second propylene polymer to the MFR of the second propylene polymer being not less than 30. These propylene polymer compositions are excellent in heat resistance, mechanical strength, tensile elongation at break, etc., and hence they can be favorably used for various structural materials such as those of automobile and electrical appliances, daily necessaries, various films and sheets.

Unconjugated cyclopolyene copolymer, rubber composition, and use

Rubber composition for extrusion molding and for molding with mold and use thereof

The crosslinkable rubber composition is crosslinkable at room temperature, has a gelation time at room temperature of 30 days or less, and can prepare a crosslinked rubber sheet by crosslinking the composition at room temperature, wherein the crosslinked rubber sheet has a tensile elongation of 20% or more, and is free of cracks after treatment at 40&deg; C. in a 50 pphm ozone concentration for 96 hr. Specifically, it comprises an ethylene/&agr;-olefin/non-conjugated polyene random copolymer rubber comprising a norbornene compound having a specific vinyl end group, an SiH group-containing compound, which has at least two SiH groups in one molecule, and optionally a platinum catalyst, a reaction inhibitor and/or a silane-coupling agent. The sealing, potting and coating materials and adhesives of the present invention comprise the above rubber composition.

An olefin thermoplastic elastomer composition comprises a crystalline polyolefin resin (A) and an ethylene/&agr;-olefin/nonconjugated polyene copolymer rubber (B), and optionally a softener (C) and/or an inorganic filler (D), in a specific ratio. The copolymer rubber (B) is prepared by the use of a metallocene catalyst and comprises ethylene, an &agr;-olefin of 3 to 20 carbon atoms and a nonconjugated polyene. This composition ca provide molded products of more excellent tensile strength, elongation at break, elastomeric properties (elongation set, permanent compression set, etc.), heat resistance and low-temperature properties than the conventional non-crosslinked olefin thermoplastic elastomers, even if the composition is in the non-crosslinked form. The composition in the partially or completely crosslinked form can provided molded products of more excellent low-temperature properties, tensile strength, elongation at break and elastomeric properties than the conventional vulcanized rubbers.

Olefin thermoplastic elastomer composition comprising crystalline polyolefin resin and ethylene/&agr;-olefin/nonconjugated polyene copolymer rubber

Ethylene copolymer rubber, process for producing the same, and use

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Ichihara, Japan

Masaaki Kawasaki