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:
A rubber modifier which can improve the workability in roll kneading and in extrusion of rubber without deteriorating the material properties of the rubber and which is superior in the performance of handling and working is provided. The rubber modifier comprises an ethylene/α -olefin copolymer rubber (A) composed of one or more copolymers selected from the group consisting of a copolymer of ethylene and an α - olefin having 3 - 20 carbon atoms and a copolymer of ethylene, an α -olefin having 3 - 20 carbon atoms and a non-conjugated polyene, the copolymer rubber (A) having the parameters: an ethylene/α -olefin mole ratio in the range of 51/49 to 87/13, an intrinsic viscosity [η ] determined in decahydronaphthalene at 135 °C in the range of 0.8 to 2.5 dl/g and an iodine value in the range of 0 to 40.
摘要:
An olefin thermoplastic elastomer composition comprising 10 to less than 60 parts by weight of a crystalline polyolefin resin (A) and 90 to more than 40 parts by weight of an ethylene/α-olefin/nonconjugated polyene copolymer rubber (B), the total amount of components (A) and (B) being 100 parts by weight, said rubber (B) being obtainable by random copolymerization of ethylene, an α-olefin having 3 to 20 carbon atoms and a nonconjugated polyene in the presence of a metallocene catalyst and having: (1) a molar ratio of (a) units derived from ethylene to (b) units derived from the α-olefin having 3 to 20 carbon atoms of 40:60 to 95:5 ((a):(b)); (2) an iodine value of 1 to 50; and (3) an intrinsic viscosity (η), as measured in decalin at 135°, of 0.1 dl/g to 10 dl/g.
摘要:
Disclosed is a foam processable rubber composition which comprises an ethylene/α-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 °C and a foaming agent (C), in specific proportions. The copolymer rubber (A) has an ethylene/α-olefin molar ratio of 60/40 to 80/20, an intrinsic viscosity (η), as measured in decalin at 135 °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.
摘要:
The present invention relates to an olefinic thermoplastic elastomer composition which comprises a crystalline polyolefin resin (A), an ethylene- alpha -olefin-non-conjugated polyene copolymer rubber(B) and at least one rubber(C) selected from polyisobutylene, butyl rubber and a propylene-ethylene copolymer rubber having a propylene content of 50 mol% or more or an ethylene- alpha -olefin copolymer(D) having a density of 0.870 to 0.940 (g/cm ) and an ethylene content of 85 mol% or more, said ethylene- alpha -olefin-non-conjugated polyene copolymer rubber(B) being a crosslinked thermoplastic elastomer composition, being obtained by random copolymerization of ethylene, an alpha -olefin having 3 to 20 carbon atoms and a non-conjugated polyene in the presence of a metallocene catalyst, (1) containing the unit (a) derived from the ethylene and the unit (b) derived from the alpha -olefin in a molar ratio of 40/60 to 95/5 (a)/(b), (2) having an iodine value of 1 to 50 and (3) having an intrinsic viscosity eta measured in decalin at 135 DEG C of 1.0 to 10 dl/g; and relates to a method for manufacturing the same.
摘要:
The present invention relates to an olefinic thermoplastic elastomer composition which comprises a crystalline polyolefin resin(A), an ethylene-α-olefin-non-conjugated polyene copolymer rubber(B) and at least one rubber(C) selected from polyisobutylene, butyl rubber and a propylene-ethylene copolymer rubber having a propylene content of 50 mol% or more or an ethylene-α-olefin copolymer(D) having a density of 0.870 to 0.940 (g/cm 3 ) and an ethylene content of 85 mol% or more, said ethylene-α-olefin-non-conjugated polyene copolymer rubber(B) being a crosslinked thermoplastic elastomer composition, being obtained by random copolymerization of ethylene, an α-olefin having 3 to 20 carbon atoms and a non-conjugated polyene in the presence of a metallocene catalyst, (1) containing the unit (a) derived from the ethylene and the unit (b) derived from the α-olefin in a molar ratio of 40/60 to 95/5 [(a)/(b)], (2) having an iodine value of 1 to 50 and (3) having an intrinsic viscosity [η] measured in decalin at 135°C of 1.0 to 10 dl/g; and relates to a method for manufacturing the same.