Claims
- 1. An ethylene copolymer composition comprising:
- (A-1) an ethylene/.alpha.-olefin copolymer of ethylene with an .alpha.-olefin of 3 to 20 carbon atoms having such properties that
- (i) the density (d) is in the range of 0.880 to 0.960 g/cm.sup.3,
- (ii) the melt flow rate (MFR) at 190.degree. C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min,
- (iii) the temperature (Tm(.degree.C.)) at which the endothermic curve of said copolymer measured by a differential scanning calorimeter (DSC) shows the maximum peak and the density (d) satisfy the relation
- Tm<400.times.d-250,
- (iv) 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,
- (v) the flow index (FI(1/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>75.times.MFR, and
- (vi) the amount (W(% by weight)) of a decane-soluble portion at 23.degree. C. and the density (d) satisfy the relation,
- in the case of MFR.ltoreq.10 g/10 min,
- W<80.times.exp (-100(d-0.88))+0.1;
- in the case of MFR>10 g/10 min,
- W<80.times.(MFR-9).sup.0.26 .times.exp (-100(d-0.88))+0.1;
- and
- (B-1) a high-pressure radical polymerization low-density polyethylene having such properties that
- (i) the melt flow rate (MFR) is in the range of 0.1 to 50 g/10 min, and
- (ii) the molecular weight distribution (Mw/Mn, Mw=weight-average molecular weight, Mn=number-average molecular weight) measured by GPC and the melt flow rate (MFR) satisfy the relation
- Mw/Mn.gtoreq.7.5.times.log (MFR)-1.2;
- a weight ratio ((A-1):(B-1)) between said ethylene/.alpha.-olefin copolymer (A-1) and said high-pressure radical polymerization low-density polyethylene (B-1) being in the range of 98:2 to 70:30.
- 2. The ethylene copolymer composition of claim 1 wherein the ethylene/.alpha.-olefin (A-1) contains ethylene units in an amount from 55 to 99% by weight and .alpha.-olefin units in an amount of from 1 to 45% by weight.
- 3. The ethylene copolymer composition of claim 1 wherein the ethylene/.alpha.-olefin copolymer (A-1) contains unsaturated bonds in an amount of not more than 0.5 per 1000 carbon atoms and less than 1 per molecule of the copolymer.
- 4. The ethylene copolymer composition of claim 1 wherein the high-pressure radical polymerization low-density polyethylene (B-1) has a density in the range of from 0.910 to 0.930 g/cm.sup.3.
- 5. The ethylene copolymer composition of claim 1 wherein the weight ratio of (A-1) to (B-1) is in the range of from 98:2 to 80:20.
- 6. The ethylene copolymer composition of claim 1 wherein the ethylene/.alpha.-olefin copolymer (A-1) is obtained by copolymerizing ethylene and .alpha.-olefin having 3 to 20 carbon atoms in the presence of an olefin polymerization catalyst formed from (a) a metallocene compound, (b) an organoaluminum oxy-compound, (c) a carrier, and, optionally, (d) an organoaluminum compound catalyst component.
- 7. The ethylene copolymer composition of claim 1 wherein the ethylene/.alpha.-olefin copolymer (A-1) is obtained by copolymerizing ethylene and .alpha.-olefin having 3 to 20 carbon atoms in the presence of an olefin polymerization catalyst formed from (a) transition metal compound catalyst component represented by the following formula (I) or (II), (b) an organoaluminum oxy-compound, (c) a carrier, and, optionally, (d) an organoaluminum compound catalyst component;
- MKL.sup.1.sub.x-2 (I)
- ML.sup.2.sub.x (II)
- wherein
- M is a transition metal atom selected from Group IVB of the periodic table,
- K is a bidentate ligand formed by bonding the same or different indenyl groups, substituted indenyl groups or their partially hydrogenated products through a lower alkylene group,
- L.sup.1 is a hydrocarbon group of 1 to 12 carbon atoms, an alkoxy group, an aryloxy group, a halogen atom, a trialkylsilyl group or a hydrogen atom,
- L.sup.2 is a ligand coordinating to the transition metal atom, at least two of L.sup.2 are substituted cyclopentadienyl group having 2-5 substituted groups selected from methyl group and ethyl group, and L.sup.2 other than the substituted cyclopentadienyl group is a hydrocarbon group of 1 to 12 carbon atoms, an alkoxy group, an aryloxy group, a halogen atom, a trialkylsilyl group or a hydrogen atom, and
- X is a valence of the transition metal M.
Priority Claims (8)
Number |
Date |
Country |
Kind |
4-157937 |
Jun 1992 |
JPX |
|
4-157938 |
Jun 1992 |
JPX |
|
4-239279 |
Sep 1992 |
JPX |
|
4-239280 |
Sep 1992 |
JPX |
|
5-68281 |
Mar 1993 |
JPX |
|
5-68282 |
Mar 1993 |
JPX |
|
5-68850 |
Mar 1993 |
JPX |
|
5-68851 |
Mar 1993 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/077,352, filed Jun. 16, 1993, now abandoned.
US Referenced Citations (5)
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EPX |
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Dec 1993 |
EPX |
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JPX |
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JPX |
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GBX |
9003414 |
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WOX |
9214784 |
Sep 1992 |
WOX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
77352 |
Jun 1993 |
|