Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Rubber composition
 A rubber composition excellent in shape-retainability also in processibility, compression set and the like, which comprises a single ethylene-.alpha.-olefin-non-conjugated diene copolymer which has (1) a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 80 to 200, (2) a weight average molecular weight/number average molecular weight ratio of 6 or more as measured by a gel permeation chromatography (GPC), and (3) a stress-retention of 0.2 or more after 100 seconds at 80.degree. C. in a compression type stress-relaxation test. 
Japan Synthetic Rubber Co., Ltd.
C C C C C C C C C
C08K C08L C08K C08L C08K C08L C08L C08K C08F
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Yoji Shoei Takashi
Mori Tsuji Kawata