Claims
- 1. An ethylene polymer having the following properties:
- (i) a density in the range of from 0.94 to 0.98 g/cm.sup.3,
- (ii) a melt flow rate, as measured at 190.degree. C. under a load of 2.16 kg, in the range of from 0.02 to 10 g/10 min,
- (iii) a melt tension (MT) and melt flow rate (MFR) which satisfies the relationship represented by the formula:
- log MT<-0.4 log MFR+0.75
- (iv) a molecular weight distribution Mw/Mn in the range of from 3 to 8,
- (v) a molecular weight distribution Mz/Mw in the range of from 2 to 5,
- (vi) a g* value, which is an index of a proportion of long-chain branches, in the range of from 0.90 to 1.00, and
- (vii) a swell ratio in the range of from 1.35 or more.
- 2. The ethylene polymer as claimed in claim 1, which is prepared by the use of Ziegler-Natta catalyst.
- 3. The ethylene polymer as claimed in claim 1, which is prepared by the use of an ethylene polymerization catalyst comprising:
- �I! a solid titanium catalyst component obtained by the contact with each other of oxygen and a solid titanium organometallic compound complex which is obtained by the contact with each other of
- (A) a solid titanium composite containing titanium, magnesium, halogen and a compound having at least two ether linkages present through plural atoms, which is obtained by the contact with each other of
- (a) a liquid magnesium compound having no reduction ability,
- (b) a compound having at least two ether linkages present through plural atoms, and
- (c) a liquid titanium compound, and optionally
- (d) a precipitating agent,
- wherein at least one of said components (a), (b), (c) and (d) contains a halogen-containing compound,
- and
- (B) an organometallic compound containing a metal selected from Group I to Group III of the periodic table; and
- �II! an organometallic compound catalyst component containing a metal selected from Group I to Group III of the periodic table.
- 4. The ethylene polymer as claimed in claim 1, which is prepared by the use of an ethylene polymerization catalyst comprising:
- (I) a solid titanium catalyst component obtained by the contact with each other of oxygen and a solid titanium organometallic compound complex which is obtained by the contact with each other of
- (A) a solid titanium composite containing titanium, magnesium, halogen and a compound having at least two ether linkages present through plural atoms, which is obtained by the contact with each other of
- (a) magnesium chloride,
- (b) 2-isopropyl-2-isopentyl-1,3-dimethoxy propane,
- (c) titanium tetrachloride, and optionally
- (d) a precipitating agent,
- wherein at least one of said components (a), (b), (c) and (d) contains a halogen-containing compound,
- and
- (B) an organoaluminum compound represented by the following formula:
- R.sup.a.sub.n AlX.sub.3-n
- wherein R.sup.a is a hydrocarbon group of 1 to 12 carbon atoms, X is a halogen atom or a hydrogen atom, and n is 1 to 3; and
- (II) an organoaluminum compound represented by the following formula:
- R.sup.a.sub.n AlX.sub.3-n
- wherein R.sup.a is a hydrocarbon group of 1 to 12 carbon atoms, X is a halogen atom or a hydrogen atom, and n is 1 to 3.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-021085 |
Feb 1994 |
JPX |
|
Parent Case Info
This application is a continuation-in-part of application Ser. No. 08/390,581 filed on Feb. 17, 1995, now abandoned.
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Continuations (1)
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Number |
Date |
Country |
Parent |
390581 |
Feb 1995 |
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