Unconjugated cyclopolyene copolymer, rubber composition, and use

A random copolymer based on non-conjugated cyclic polyene comprising structural units originated from one or more α-olefins (A1), originated from one or more non-conjugated cyclic polyenes (A2) and originated from one or more non-conjugated linear polyenes (A3), the said random copolymer having characteristic features comprising:

• a content of the structural unit(s) originated from the said one or more α-olefins (A1) in the range of 97.9 to 55 mole %,
• a content of the structural unit originated from the said one or more non-conjugated cyclic polyenes (A2) in the range of 2 to 30 mole %,
• a content of the structural unit originated from the said one or more non-conjugated linear polyenes (A3) in the range from 0.1 to 15 mole %,
• an intrinsic viscosity [η], determined in decahydronaphthalene at 135° C., in the range of 0.01 to 20 dl/g,
• a glass transition temperature (Tg) −30° C. to +40° C., and an iodine value in the range of 5 to 150.

A rubber composition comprising

• (A) a random copolymer based on non-conjugated cyclic polyene comprising structural units originated from one or more α-olefins (A1) and originated from one or more non-conjugated cyclic polyene (A2), the said random copolymer having characteristic features comprising:
• a content of the structural unit(s) originated from the said one or more α-olefins (A1) in the range of 93 to 70 mole %;
• a content of the structural unit originated from the said one or more non-conjugated cyclic polyenes (A2) in the range of 7 to 30 mole %;
• an intrinsic viscosity [η], determined in decahydronaphthalene at 135° C., in the range of 0.01 to 20 dl/g;
• a glass transition temperature (TG) of −30° C. to +40° C.;
• and an iodine value in the range of 35 to 150;
• and
• (B) a rubber based on diene, wherein the weight proportion of (the random copolymer based on non-conjugated cyclic polyene) versus (the rubber based on diene), namely, (A/(B), is in the range of 60/40 to 0.1/99.9.

A rubber composition comprising:

• (A) a random copolymer based on non-conjugated cyclic polyene comprising structural units originated from one or more α-olefins (A1) and originated from one or more non-conjugated cyclic polyenes (A2) and originated from one or more non-conjugated linear polyene (A3), the said random copolymer having characteristic features comprising:
• a content of the structural unit(s) originated from the said one or more α-olefins (A1) in the range of 97.9 to 55 mole %;
• a content of the structural unit originated from the said one or more non-conjugated cyclic polyenes (A2) in the range of 2 to 30 mole %;
• a content of the structural unit originated from the said one or more non-conjugated linear polyene (A3) in the range of 0.1 to 15 mole %;
• an intrinsic viscosity [η], determined in decahydronaphthalene at 135° C., in the range of 0.01 to 20 dl/g;
• a glass transition temperature (Tg) of −30° C. to +40° C.;
• and an iodine value in the range of 5 to 150, and
• (B) a rubber based on diene, wherein the weight proportion of (the random copolymer based on non-conjugated cyclic polyene) versus (the rubber based on diene), namely, (A)/(B), is in the range from 60/40 to 0. 1/99.9.