US 5,464,905 AGranted

Ethylene/.alpha.-olefin copolymer composition, graft modified ethylene/.alpha.-olefin copolymer composition, ethylene copolymer composition, and multi-stage olefin polymerization process

AssigneeMitsui Petrochemical Industries, Ltd.

InventorsToshiyuki Tsutsui, Ken Yoshitsugu, Mamoru Takahashi, Akira Todo, Seiji Ohta, Hajime Inagaki

Life of this patent

Estimating the term…

Loading patent…

Abstract

An ethylene/.alpha.-olefin copolymer composition containing a first and second ethylene/.alpha.-olefin copolymer is disclosed. The first ethylene/.alpha.-olefin copolymer is prepared in the prsence of a polymerization catalyst containing an organoaluminum oxy compound and at least two kinds of metallocene compounds (b) and the second ethylene/.alpha.-olefin copolymer, which differs from the first in at least one physical property, is prepared in the presence of a polymerization catalyst containing an organoaluminum oxy compound and a metallocene compound (b'). The ethylene/.alpha.-olefin copolymer composition has excellent moldability and heat stability properties and forms films having high transparency and mechanical strength.

Claims9

Dependent claims

An ethylene/.alpha.-olefin copolymer composition comprising:

[A1] an ethylene/.alpha.-olefin copolymer in an amount of 20 to 90% by weight, which is obtained by copolymerizing ethylene with an .alpha.-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b) at least two kinds of compounds of Group IV transition metals of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that:
(A-i) the density is in the range of 0.850 to 0.980 g/cm.sup.3, and
(A-ii) the intrinsic viscosity [.eta.] as measured in decalin at 135.degree. C. is in the range of 0.4 to 8 dl/g;
and
(A-iii) the melt tension (MT(g)) at 190.degree. C. and the melt flow rate (MFR) satisfy the relation
MT>2.22.times.MFR.sup.0.84;
[B1] an ethylene/.alpha.-olefin copolymer in an amount of 10 to 80% by weight, which has a density and MFR different from the ethylene/.alpha.-olefin copolymer [A1] and is obtained by copolymerizing ethylene with an .alpha.-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b') a compound of Group IV transition metal of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that:
(B-i) the density is in the range of 0.850 to 0.980 g/cm.sup.3, and
(B-ii) the intrinsic viscosity [.eta.] as measured in decalin at 135.degree. C. is in the range of 0.4 to 8 dl/g.

6 more elements

An ethylene/.alpha.-olefin copolymer composition comprising:

[A2] an ethylene/.alpha.-olefin copolymer in an amount of 20 to 90% by weight, which is a copolymer of ethylene with an .alpha.-olefin of 3 to 20 carbon atoms obtained by copolymerization in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b) at least two kinds of compounds of Group IV transition metals of the periodic table containing a ligand having a cyclopentadienyl skeleton, and has such properties that:
(A-i) the density is in the range of 0.850 to 0.980 g/cm.sup.3, and
(A-ii) the intrinsic viscosity [.eta.] as measured in decalin at 135.degree. C. is in the range of 0.4 to 8 dl/g,
(A-iii) the melt tension (MT (g)) at 190.degree. C. and the melt flow rate (MFR) satisfy the relation
MT>2.2.times.MFR.sup.-0.84,
(A-iv) the flow index (FI (l/sec)) defined by a shear rate which is given when a shear stress of molten copolymer at 190.degree. C. reaches 2.4.times.10.sup.6 dyne/cm.sup.2 and the melt flow rate (MFR) satisfy the relation
FI<150.times.MFR,
(A-v) the molecular weight distribution (Mw/Mn) measured by GPC is in the range of 1.5 to 4, and
(A-vi) MT/(Mw/Mn) and FI/MFR satisfy the relation
MT/(Mw/Mn)>0.03.times.FI/MFR-3.0
with the proviso that when the value of 0.03.times.FI/MFR-3.0 is less than 0, it is taken as 0;
and
[B1] an ethylene/.alpha.-olefin copolymer in an amount of 10 to 80% by weight, which has a density and MFR different from the ethylene/.alpha.-olefin copolymer [A2] and is obtained by copolymerizing ethylene with an .alpha.-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b') a compound of Group IV transition metal of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that:
(B-i) the density is in the range of 0.850 to 0.980 g/cm.sup.3, and
(B-ii) the intrinsic viscosity [.eta.] as measured in decalin at 135.degree. C. is in the range of 0.4 to 8 dl/g.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/154,467Filed 18 Nov 1993
Priority: JP 4-31061619 Nov 1992
Granted: 7 Nov 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

C08F 10/00
Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double
C08F 210/16
Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: copolymers of ethene with alpha-alkenes, e.g. EP…
C08F 255/02
Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00: on to polymers of olefins…
C08F 255/04
On to polymers of olefins having two or three carbon atoms: on to ethylene-propylene copolymers