US 5,292,845 A · Ethylene/alpha-olefin/7-methyl-1,6-octadiene copolymer rubber and composition of the same

Abstract

The ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber of the invention is a random copolymer rubber prepared using a Group IVB transition metal type catalyst containing a specific zirconium catalyst component, and in this copolymer rubber, a molar ratio of ethylene to .alpha.-olefin, a diene content, an intrinsic viscosity [.eta.], an intensity ratio D of T.alpha..beta. to T.alpha..alpha. in a .sup.13 C-NMR spectrum of said copolymer rubber, a B value which is a measure of distribution of each monomer and a glass transition temperature are all within specific ranges. The rubber composition of the invention comprises the above-mentioned random copolymer rubber and a conjugated diene rubber. The random copolymer rubber has high stereoregularity, narrow composition distribution and excellent low-temperature flexibility, and shows extremely high covulcanizability with the conjugated diene rubber. In addition, this random copolymer rubber is excellent in weathering resistance, ozone resistance and thermal aging resistance.

Claims12

Dependent claims

(i) a molar ratio of ethylene to .alpha.-olefin (ethylene/.alpha.-olefin) in the range of 40/60 to 90/10;
(ii) a content of 7-methyl-1,6-octadiene in the range of 0.4 to 25% by mol;
(iii) an intrinsic viscosity (.eta.) as measured in decahydronaphthalene at 135.degree. C., from 0.1 dl/g to 8 dl/g;
(iv) an intensity ratio D of T.alpha..beta. to T.alpha..alpha.(T.alpha..beta./T.alpha..alpha.) in a .sup.13 C-NMR spectrum of said copolymer rubber not more than 0.5;
(v) a B value determined by a .sup.13 C-NMR spectrum of said copolymer rubber and the following formula in the range of 1.00 to 1.50
B=P.sub.OE / (wP.sub.E .multidot.P.sub.O)
wherein P.sub.E is a molar fraction of the ethylene units derived from ethylene;
P.sub.O is a molar fraction of the .alpha.-olefin units derived from .alpha.-olefin;
and P.sub.OE is a ratio of the number of .alpha.-olefin/ethylene chains to the number of all dyad chains in the random copolymer rubber;
and
(vi) a glass transition temperature Tg measured by DSC not higher than -53.degree. C.

8 more elements

An ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber, said copolymer rubber being a random copolymer rubber of ethylene, .alpha.-olefin and 7-methyl-1,6-octadiene copolymer and obtained by copolymerizing ethylene, .alpha.-olefin and 7-methyl-1,6-octadiene in the presence of a Group IVB transition metal catalyst comprising (a) a Group IVB transition metal compound containing a ligand having cyclopentadienyl skeleton and (b) an organoaluminum oxycompound, wherein the ethylene/.alpha.olefin/7-methyl-1,6-octadiene copolymer rubber comprises

(i) a molar ratio of ethylene to .alpha.-olefin (ethylene/.alpha.-olefin) in the range of 40/60 to 90/10;
(ii) a content of 7-methyl-1,6-octadiene copolymer in the range of 0.4 to 25% by mol;
(iii) an intrnsic viscosity (.eta.) as measured in decahydronaphthalene at 135.degree. C., from 0.1 dl/g to 8 dl/g;
(iv) an intensity ratio D of T.alpha..beta. to T.alpha..alpha.(T.alpha..beta./T.alpha..alpha.) in a .sup.13 C-NMR spectrum of said copolymer rubber not more than 0.5;
(v) a B value determined by a .sup.13 C-NMR spectrum of said copolymer rubber and the following formula in the range of 1.00 to 1.5
B=P.sub.OE /(2P.sub.E .multidot.P.sub.O)
wherein P.sub.E is a molar fraction of the ethylene units derived from ethylene;
P.sub.O is a molar fraction of the .alpha.-olefin units derived from .alpha.-olefin;
and P.sub.OE is a ratio of the number of .alpha.-olefin/ethylene chains to the number of all dyad chains in the random copolymer rubber;
and
(vi) a glass transition temperature Tg measured by DSC not higher than -53.degree. C.

8 more elements

An ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber composition comprising a random copolymer rubber of ethylene, .alpha.-olefin and 7-methyl-1,6-octadiene and a conjugated diene rubber, wherein the ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber comprises

(i) a molar ratio of ethylene to .alpha.-olefin (ethylene/.alpha.-olefin) in the random copolymer rubber in the range of 40/60 to 90/10;
(ii) a content of 7-methyl-1,6-octadiene in the random copolymer rubber in the range of 0.4 to 25% by mol;
(iii) an intrinsic viscosity (.eta.) of the random copolymer rubber, as measured in decahydronaphthalene from 0.1 dl/g to 8 dl/g;
(iv) an intensity ratio D of T.alpha..beta. to T.alpha..alpha. (T.alpha./.beta./T.alpha..alpha.) in a .sup.13 C-NMR spectrum of the random copolymer rubber not more than 0.5;
(v) a B value determined by a .sup.13 C-NMR spectrum of the random copolymer rubber and the following formula in the range of 1.00 to 1.50
B=P.sub.OE /(2P.sub.E .multidot.P.sub.O)
wherein P.sub.E is a molar fraction of the ethylene units derived from ethylene;
P.sub.O is a molar fraction of the .alpha.-olefin units derived from .alpha.-olefin;
and P.sub.OE is a ratio of the number of .alpha.-olefin/ethylene chains to the number of all dyad chains in the random copolymer rubber;
and
(vi) a glass transition temperature Tg of the random copolymer rubber measured by DSC not higher than -53.degree. C.

8 more elements

An ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber composition comprising a random copolymer rubber and a conjugated diene rubber, said random copolymer rubber being obtained by copolymerizing ethylene, .alpha.-olefin and 7-methyl-1,6-octadiene in the presence of a Group IVB transition metal catalyst comprising (a) a Group IVB transition metal compound containing a ligand having cyclopentadienyl skeleton and (b) an organoaluminum oxycompound, wherein the ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber comprises

(i) a molar ratio of ethylene to .alpha.-olefin (ethylene/.alpha.-olefin) in the random copolymer rubber in the range of 40/60 to 90/10;
(ii) a content of 7-methyl-1,6-octadiene in the random copolymer rubber in the range of 0.4 to 25% by mol;
(iii) an intrinsic viscosity (.eta.) of the random copolymer rubber, as measured in decahydronaphthalene at 135.degree. C., from 0.1 dl/g to 8 dl/g;
(iv) an intensity ratio D of T.alpha..beta. to T.alpha..alpha. (T.alpha..beta./T.alpha..alpha.) in a .sup.13 C-NMR spectrum of the random copolymer rubber not more than 0.5;
(v) a B value determined by a .sup.13 C-NMR spectrum of the random copolymer rubber and the following formula in the range of 1.00 to 1.50
B=P.sub.OE /(2P.sub.E .multidot.P.sub.O)
wherein P.sub.E is a molar fraction of the ethylene units derived from ethylene;
P.sub.O is a molar fraction of the .alpha.-olefin units derived from .alpha.-olefin;
and P.sub.OE is a ratio of the number of .alpha.-olefin/ethylene chains to the number of all dyad chains in the random copolymer rubber;
and
(vi) a glass transition temperature Tg of the random copolymer rubber measured by DSC not higher than -53.degree. C.

8 more elements

Dependencies are inferred from the claim text.

Ethylene/alpha-olefin/7-methyl-1,6-octadiene copolymer rubber and composition of the same

Life of this patent

Ethylene/alpha-olefin/7-methyl-1,6-octadiene copolymer rubber and composition of the same

Life of this patent

Abstract

Claims12