Mitsui Chemicals, Inc.

Shin-etsu Chemical Co., Ltd.

Mitsui Petrochemical Industries, Ltd.

Shuichi Nonaka

Masaaki Kawasaki

Hidenari Nakahama

Takashi Hakuta

Taku Koda

Tsutomu Nakamura

Takeo Yoshida

Tetsuo Tojo

Yoshiharu Kikuchi

Kotaro Ichino

Satao Hirabayashi

Hiroki Ebata

Mikio Hosoya

Yuji Ishii

Mitsunao Arino

Shinya Matsunaga

Yuji Noguchi

Takashi Mishima

Kazuyoshi Kaneko

Akinori Takehara

Masao Kunizane

Hiroshi Kameda

Norihito Ueki

Satoshi Hase

The present invention provides a molded product exhibiting excellent various properties by improving compatibility of an ethylene/&#x3b1;-olefin/non-conjugated polyene copolymer with a polyolefin resin and a rubber composition for forming the molded product. The present invention further provides a molded product which comprises a rubber composition, is inhibited from fogging and tackiness and is excellent in mechanical strength and heat aging resistance. The rubber composition of the invention comprises an ethylene/&#x3b1;-olefin/non-conjugated polyene copolymer (A), and a polyolefin resin (B) having Mn of not less than 10,000 and/or an ethylene/&#x3b1;-olefin copolymer (C) having Mn of 2500 to 5000, and satisfies the following requirements: (1) a maximum value and a minimum value of an ethylene distribution parameter P of the component (A) have a relationship of Pmax/Pmin&#x2266;1.4, and (2) the B value of the component (C) ([EX]/(2[E]&#xd7;[X])) ([E] and [X] are molar fractions of ethylene and the &#x3b1;-olefin of 3 to 20 carbon atoms, respectively, and [EX] is a fraction of dyad sequence of ethylene/&#x3b1;-olefin of 3 to 20 carbon atoms) is not more than 1.05.

Rubber composition, crosslinked product and foam thereof, molded product therefrom, 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

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

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

A vulcanizable rubber composition comprising a conjugated diene rubber (A), an ethylene-alpha-olefin copolymer rubber (B) and a styrene oligomer (C) is provided. The composition is capable of providing a vulcanized rubber which is excellent not only in weather resistance and heat aging characteristics, but also in mechanical strength.

Vulcanizable rubber composition and vulcanized rubber

Growing community of inventors

Kisarazu, Japan

Shuichi Nonaka