摘要:
This invention relates to a composition comprising (A) an ethylene - α -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 2 /g (BET adsorption amount: ISO 5794/1, Annex D), (C) at least one kind of α,β-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.
摘要:
According to the present invention, there is provided a rubber composition for a conveyor belt comprising (A) 100 parts by weight of an ethylene/a-olefin containing 3 to 20 carbon atoms/non-conjugated polyene copolymer rubber containing a diene unit derived from special non-conjugated dienes, (B) 0.5 to 15 parts by weight of an organic peroxide, (C) 30 to 80 parts by weight of a carbon black and (D) 5 to 25 parts by weight of a softening agent.
摘要:
Disclosed is an ethylene-α-olefin-nonconjugated polyene random copolymer having such properties that (i) the copolymer contains units derived from ethylene (a) and units derived from the α-olefin of 3 or more carbon atoms (b) in a molar ratio of 40/60 to 64/36 [(a)/(b)], (ii) the iodine value is 1 to 50, (iii) the intrinsic viscosity (η) is more than 0.3 dl/g and less than 5.0 10 dl/g, (iv) the intensity ratio D of Tαβ to Tαα in the 13 C-NMR spectrum, Tαβ/Tαα is not more than 0.5, (v) the B value is 1.00 to 1.50 and (vi) the glass transition temperature Tg is not higher than -50°C. Also disclosed is a vulcanizable rubber composition containing the random copolymer. A process of preparing this copolymer by using a metallocene catalyst containing a specified metallocene compound is also disclosed. The ethylene-α-olefin-nonconjugated polyene random copolymer and the rubber composition are excellent in mechanical strength, weathering resistance, ozone resistance, processability, low temperature flexibility and heat resistance.
摘要:
According to the present invention, there is provided a rubber composition for a conveyor belt comprising (A) 100 parts by weight of an ethylene/a-olefin containing 3 to 20 carbon atoms/non-conjugated polyene copolymer rubber containing a diene unit derived from special non-conjugated dienes, (B) 0.5 to 15 parts by weight of an organic peroxide, (C) 30 to 80 parts by weight of a carbon black and (D) 5 to 25 parts by weight of a softening agent.
摘要:
Disclosed is an ethylene-α-olefin-nonconjugated polyene random copolymer having such properties that (i) the copolymer contains units derived from ethylene (a) and units derived from the α-olefin of 3 or more carbon atoms (b) in a molar ratio of 40/60 to 64/36 [(a)/(b)], (ii) the iodine value is 1 to 50, (iii) the intrinsic viscosity (η) is more than 0.3 dl/g and less than 5.0 10 dl/g, (iv) the intensity ratio D of Tαβ to Tαα in the 13 C-NMR spectrum, Tαβ/Tαα is not more than 0.5, (v) the B value is 1.00 to 1.50 and (vi) the glass transition temperature Tg is not higher than -50°C. Also disclosed is a vulcanizable rubber composition containing the random copolymer. A process of preparing this copolymer by using a metallocene catalyst containing a specified metallocene compound is also disclosed. The ethylene-α-olefin-nonconjugated polyene random copolymer and the rubber composition are excellent in mechanical strength, weathering resistance, ozone resistance, processability, low temperature flexibility and heat resistance.