Mitsui Chemicals, Inc.

Shin-etsu Chemical Co., Ltd.

Taku Koda

Masaaki Kawasaki

Tetsuo Tojo

Takashi Hakuta

Hidenari Nakahama

Yuji Ishii

Shuichi Nonaka

Norio Kashiwa

Tsutomu Nakamura

Keiji Okada

Takeo Yoshida

Tadahito Nobori

Yoshiharu Kikuchi

Tomoaki Matsugi

Satoru Moriya

Kotaro Ichino

Shinichi Kojoh

Ryoji Mori

Satao Hirabayashi

Mikio Hosoya

Seiji Ota

Hideyuki Kaneko

Mitsunao Arino

Junji Tan

Masao Kunizane

Yasuhiro Hosomi

Shunichi Hama

Hiroshi Kameda

Yuji Miura

Yoshio Maejima

Olefin block copolymers (A-1) are disclosed represented by the formula (I) PO-g-B. . . (I) wherein POis a segment comprised of repeating units derived from an olefin having 2 to 20 carbon atoms, gis an ester, ether, amide, imide, urethane, urea, silylether or carbonyl linkage, and Bis a segment containing an unsaturated hydrocarbon or a hetero atom. The olefin block copolymers are suitable for uses in adhesives, various molded articles such as construction and civil engineering materials, automobile interior and exterior materials, gasoline tanks, electric and electronic parts, medical care and sanitation materials, materials of miscellaneous goods, resin materials having environmental degradation properties, films and sheets, modifiers and dispersions.

Olefin block copolymers, processes for producing the same and uses thereof

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

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

Rubber modified with ethylene/&agr;-olefin(/diene) rubber(s)

Rubber modifier of ethylene/&agr;-olefin (/diene) copolymer rubber(s)

Ethylene/&agr;-olefin/unconjugated polyene copolymer rubber, rubber composition for sealing, molded rubber for sealing, and process for producing the molded rubber

Rubber composition and process for the production thereof

Disclosed is a foam processable rubber composition which comprises an ethylene/.alpha.-olefin of 3 to 20 carbon atoms/non-conjugated polyene copolymer rubber (A), a crystalline polyolefin resin (B) having a melting point of 100 to 150.degree. C. and a foaming agent (C), in specific proportions. The copolymer rubber (A) has an ethylene/.alpha.-olefin molar ratio of 60/40 to 80/20, an intrinsic viscosity (.eta.), as measured in decalin at 135.degree. C., of 0.7 to 2 dl/g, and an iodine value of 10 to 50. A vulcanized rubber foam-molded product can be obtained by vulcanizing and foaming the rubber composition. The rubber composition can provide vulcanized rubber foam-molded products having excellent vulcanization properties such as weathering resistance, heat resistance, ozone resistance and tear strength. Besides, the rubber composition exhibits excellent precision moldability and productivity of vulcanized rubber foam-molded products in transfer molding, injection molding and cast molding.

Foam processable rubber compositions and vulcanized rubber foam molded

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Ichihara, Japan

Taku Koda