Blend of epdm and sbr using an epdm of different origin as a...

C - Chemistry – Metallurgy – 08 – F

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C08F 279/00 (2006.01) B05D 5/12 (2006.01) C08F 122/00 (2006.01) C08F 293/00 (2006.01) C08L 9/00 (2006.01) C08L 23/16 (2006.01) C08L 9/06 (2006.01)

Patent

CA 2461736

A polymer blend of an ethylene-.alpha.-olefin-diene rubber and a conjugated diene rubber suitable for use as a replacement for unblended EPDM rubber in automotive applications. The rubber blends of the present invention comprise a high molecular weight EPDM rubber, a conjugated diene rubber, and a low molecular weight, high ethylene content EPDM rubber that functions as a compatibilizer. The resultant blend exhibits physical properties, including tensile and tear strength, that are comparable to conventional EPDM rubbers, while maintaining the excellent heat and weather resistance possessed by EPDM rubbers.

L'invention concerne un mélange d'un caoutchouc d'éthylène-.alpha.-oléfine-diène et d'un caoutchouc diénique conjugué approprié pour remplacer un caoutchouc EPDM non mélangé dans des applications automobiles. Les mélanges de caoutchoucs de cette invention contiennent un caoutchouc EPDM de poids moléculaire élevé, un caoutchouc diénique conjugué, et un caoutchouc EPDM à contenu éthylénique élevé de poids moléculaire faible qui agit comme un agent de compatibilité. Le mélange résultant présente des propriétés physiques, notamment une résistance à la tension et à la déchirure, lesdites propriétés étant comparables à celles de caoutchoucs EDPM traditionnels, tandis que ledit mélange conserve une excellente résistance aux intempéries et à la chaleur, résistance que possèdent les caoutchoucs EDPM.

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