Claims
- 1. An ethylene/α-olefin copolymer which is a copolymer of ethylene and 1-hexene and has the following properties:(i) the density is in the range of 0.880 to 0.960 g/cm3, (ii) the melt flow rate at 190° C. under a load of 2.16 kg is in the range of 0.1 to 100 g/10 min, (iii) the melt tension (MT (g)) at 190° C. and the melt flow rate (MFR (g/20 min)) satisfy the relation MT≦2.2×MFR−0.84, (iv) the quantity fraction (W (% by weight)) of a decane-soluble component of said copolymer at 23° C. and the density (d (g/cm3)) satisfy the relation in the case of MFR≦10 g/10 min:W<80×exp(−100(d−0.88))+0.1, in the case of MFR≦10 g/10 min:W<80×(MFR−9)0.26×exp(−100(d−0.88))+0.1, (v) the temperature (Tm (° C.)) at the position of the maximum peak of an endotherm curve of said copolymer measured by a differential scanning calorimeter and the density (d (g/cm3)) satisfy the relation Tm<400×d−248, (vi) the endotherm curve of said copolymer measured by a differential scanning calorimeter has two or more peaks, and the temperature (Tm1 (° C.)) at the position of the pea on the lowest temperature side, the temperature (Tm (° C.)) at the position of the maximum peak and the density (d (g/cm3)) satisfy the relation 576−600d>(Tm−Tm1)>558−600d, and(vii) a component, which is eluted at a temperature of not lower than 100° C. in a temperature rise elution test (TREF), exists in said copolymer, and the amount of the eluted component is not more than 10% of the total amount of the eluate.
- 2. A process for preparing an ethylene/α-olefin copolymer, which comprises:(A) copolymerizing ethylene and 1-hexene by continuous vapor phase polymerization; (B) copolymerization is conducted in the presence of a prepolymerized catalyst obtained by prepolymerizing ethylene in the presence of (a) a transition metal metallocene compound catalyst, (b) an organoaluminum oxy-compound, (c) a fine particle carrier, and optionally (d) an organoaluminum compound; (C) copolymerization is conducted under such condition that the partial pressure of the sum of the ethylene and 1-hexene is 10 to 28 kg/cm2; and (D) the resulting ethylene/1-hexene copolymer has the following properties: (i) the density is in the range of 0.880 to 0.960 g/cm3, (ii) the melt flow rate of 190° C. under a load of 2.16 kg is in the range of 0.1 to 100 g/10 min, (iii) the melt tension (MT (g)) at 190° C. and the melt flow rate (MFR (g/10 min)) satisfy the relation MT≦2.2×MFR−0.84, (iv) the quantity fraction (W (% by weight)) of a decane-soluble component of said copolymer at 23° C. and the density (d (g/cm3)) satisfy the relation in the case of MFR≦10 g/10 min: W<80×exp(−100(d−0.88))+0.1,in the case of MFR>10 g/10 min:W<80×(MFR−9)0.26×exp(−100(d−0.88))+0.1, (v) the temperature (Tm (° C.) at the position of the maximum peak of an endotherm curve of said copolymer measured by a differential scanning calorimeter and the density (d (g/cm3)) satisfy the relation Tm<400×d−248, (vi) the endotherm curve of said copolymer measured by a differential scanning calorimeter has two or more peaks, and the temperature (Tm1(° C.)) at the position of the peak on the lowest temperature side, the temperature (Tm (° C.)) at the position of the maximum peak and the density (d (g/cm3)) satisfy the relation576−600d>(Tm−Tm1)>558−600d, and(vii) a component, which is eluted at a temperature of not lower than 100° C. in a temperature rise elution test (TREF), exists in said copolymer, and the amount of the eluted component is 0.5 to 8% of the total amount of the eluate.
- 3. The process as claimed in claim 2, wherein the resulting ethylene/1-hexene copolymer has such properties that the copolymer is capable of being case molded into a film having the following properties:the film impact strength (FIS (J/m)) and the density (d (g/cm3)) satisfy the relation log(FIS)>(−50.17×d)+47.55.
- 4. The process as claimed in claim 2, wherein the copolymerization is conducted by a single stage vapor phase polymerization.
- 5. A film which is obtained from the ethylene/1-hexene copolymer produced by the process as claimed in claim 2.
- 6. A cast film which is obtained by cast molding the ethylene/1-hexene copolymer produced by the process as claimed in claim 2 and has the following properties:the film impact strength (FIS (J/m)) and the density (d (g/cm3)) satisfy the relation log(FIS>(−50.17×d)+47.55.
- 7. An ethylene/α-olefin copolymer which is prepared by copolymerizing ethylene and 1-hexene in a single stage vapor polymerization in the presence of a prepolymerized catalyst obtained by prepolymerizing ethylene in the presence of(a) a transition metal compound, (b) an aluminoxane compound, (c) a fine solid particle carrier, and (d) a C1-C4 alkylaluminum compound, or a C1-C4 alkylaluminum halide compound, wherein said transition metal compound consists essentially of a single metallocene catalyst of the formula (I): MLx (I) M is a transition metal atom selected from the group consisting of zirconium, titanium and hafnium, x is a valence of the transition metal atom M, L is a ligand coordinated to the transition metal atom M, and at least two of the ligands L are each a substituted cyclopentadienyl group having at least one substituent selected from hydrocarbon groups of 3 to 10 carbon atoms, or a substituted cyclopentadienyl group having two or more substituents, wherein at least one substituent is a hydrocarbon group of 3 or 4 carbon atoms, and other substituent is methyl or ethyl, and the ligand L other than the cyclopentadienyl group is a hydrocarbon group of 1 to 12 carbon atoms, an alkoxy group, a halogen atom, or a hydrogen atom, and which consists essentially of a copolymer of ethylene and 4 to 25% by weight of 1-hexene and has the following properties: (i) the density is in the range of 0.890 to 0.935 g/cm3, (ii) the melt flow rate at 190° C. under a load of 2.16 kg is in the range of 0.5 to 20 g/10 min, (iii) the melt tension (MT (g)) at 190° C. and the melt flow rate (MFR (g/10 min)) satisfy the relation MT≦2.2×MFR−0.84, (iv) the quantity fraction (W (% by weight)) of a decane-soluble component of said copolymer at 23° C. and the density (d (g/cm3)) satisfy the relation in the case of MFR≦10 g/10 min;W<80×exp(−100(d−0.88))+0.1, in the case of MFR>10 g/10 min: W<80×(MFR−9)0.26×exp(−100(d−0.88))+0.1,(v) the temperature (Tm (° C.)) at the position of the maximum peak of an endotherm curve of said copolymer measured by a differential scanning calorimeter and the density (d (g/cm3)) satisfy the relation Tm<400×d−248, (vi) the endotherm curve of said copolymer measured by a differential scanning calorimeter has two or more peaks, and the temperature (Tm1 (° C.)) at the position of the peak on the lowest temperature side, the temperature (Tm (° C.)) at the position of the maximum peak and the density (d (g/cm3) satisfy the relation 576−600d>(Tm−Tm1)>558−600d, and(vii) a component, which is eluted at a temperature of not lower than 100° C. in a temperature rise elution test (TREF), exists in said copolymer, and the amount of the eluted component is 1 to 5% by weight of the total amount of the eluate.
- 8. The ethylene/1-hexene copolymer as claimed in claim 7, in which in the MLx formula (I) the ligand L other than the cyclopentadienyl group is hydrocarbon group of 1 to 3 carbon atoms or a halogen atom.
- 9. The ethylene/1-hexene copolymer as claimed in claim 7, in which the transition metal compound in the prepolymerized catalyst is a member selected from the group consisting of bis(n-propyl cyclopentadienyl)zirconium dichloride, bis(n-butylcyclopentadienyl)zirconium dichloride, bis(1-methyl-3-n-propylcyclopentadienyl)zirconium dichloride and bis(1-methyl-3-n-butylcyclopentadienyl)zirconium dichloride.
- 10. The ethylene/1-hexene copolymer as claimed in claim 7, in which the prepolymerization catalyst contains a C1-C4 alkylaluminum compound.
- 11. The ethylene/1-hexene copolymer as claimed in claim 7, in which the hexene is present in an amount of about 5.3% by weight and the transition metal compound in the prepolymerized catalyst is bis(1-methyl-3-n-butyl-cyclopentadienyl)zirconium dichloride.
- 12. The ethylene/1-hexene copolymer as claimed in claim 7, capable of being cast molded into a film having the following properties:the film impact strength (FIS (J/m) and the density (d (g/cm3)) satisfy the relation log(FIS)>(−50.17×d)+47.55.
- 13. A film which is obtained from the ethylene/1-hexene copolymer as claimed in claim 7.
- 14. A cast film which is obtained by cast molding the ethylene/1-hexene copolymer as claimed in claim 7, and has the following properties:the film impact strength (FIS (J/m)) and the density (d(g/cm3)) satisfy the relation log(FIS)>(−50.17×d)+47.55.
- 15. The process for preparing the ethylene/α-olefin copolymer of claim 2 wherein the copolymerizing of ethylene and 1-hexene is carried out in a single stage vapor polymerization in the presence of a prepolymerized catalyst obtained by prepolymerizing ethylene in the presence of(a) a transition metal compound, (b) an aluminoxane compound, (c) a fine solid particle carrier, and (d) a C1-C4 alkylaluminum compound, or a C1-C4 alkylaluminum halide compound, wherein said transition metal compound consists essentially of a single metallocene catalyst of the formula (I): MLx (I) M is a transition metal atom selected from the group consisting of zirconium, titanium and hafnium, x is a valence of the transition metal M, L is a ligand coordinated to the transition metal atom M, and at least two of the ligands L are each a substituted cyclopentadienyl group having at least one substituent selected from hydrocarbon groups of 3 to 10 carbon atoms, or a substituted cyclopentadienyl group having two or more substituents, wherein at least one substituent is a hydrocarbon group of 3 or 4 carbon atoms, and other substituent is methyl or ethyl, and the ligand L other than the cyclopentadienyl group is a hydrocarbon group of 1 to 12 carbon atoms, an alkoxy group, a halogen atom, or a hydrogen atom.
- 16. The process of claim 15 wherein the MLx formula (I) the ligand L other than the cyclopentadienyl group is hydrocarbon group of 1 to 3 carbon atoms or a halogen atom.
- 17. The process of claim 15 wherein the transition metal compound in the prepolymerized catalyst is a member selected from the group consisting of bis(n-propyl cyclopentadienyl)zirconium dichloride, bis(n-butylcyclopentadienyl)zirconium dichloride, bis(1-methyl-3-n-butylcyclopentadienyl)zirconium dichloride.
- 18. The process of claim 15 wherein the prepolymerization catalyst contains a C1 to C4 alkylaluminum compound.
- 19. The process of claim 15, wherein hexene is present in an amount of about 5.3% by weight and the transition metal compound in the prepolymerized catalyst is bis(1-methyl-3-n-butyl-cyclopentadienyl)zirconium dichloride.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7-344104 |
Dec 1995 |
JP |
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Parent Case Info
This is a continuation of application Ser. No. 09/023,717 filed Feb. 13, 1998 which is a division of application Ser. No. 08/771,988 filed Dec. 23, 1996, both of which are now abandoned, application Ser. No. 09/023,717 is incorporated herein in its entirety by reference thereto.
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Continuations (1)
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Number |
Date |
Country |
Parent |
09/023717 |
Feb 1998 |
US |
Child |
09/609119 |
|
US |