Ethylene polymer
AssigneeMitsui Chemicals, Inc.
InventorsShin-ichi Kojoh, Mamoru Kioka
Life of this patent
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Abstract
An ethylene polymer having small values of Mw/Mn and Mz/Mw, a small proportion of long-chain branches, a high melt tension and a high swell ratio produced by using a solid titanium catalyst component obtained by initially bring a solid titanium composition which is obtained by the contact of a solid magnesium aluminum composite containing magnesium, halogen, aluminum, and an alkoxy group of 6 or more carbon atoms and/or alcohol of 6 of more carbon atom with a tetravalent titanium compound into contact with an organometallic compound, and then bringing the resulting product into contact with oxygen. The ethylene polymer is excellent in moldability, and the molded article obtained therefrom is excellent in rigidity and impact resistance and free from poor appearance.
Claims4
An ethylene polymer having the following properties:
- (i) a density in the range of from 0.90 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 0.001 to 3,000 g/10 min,
- (iii) a melt tension (MT) and melt flow rate (MFR) which satisfy the relationship represented by the formula:
- log MT .gtoreq.-0.41 log MFR+0.75,
- (iv) a molecular weight distribution Mw/Mn in the range of 2 to 9,
- (v) a molecular weight distribution Mz/Mw in the range of 2 to 5,
- (vi) a g* value, which is an index of a proportion of long-chain branches, in the range of 0.95 to 1.00, and
- (vii) a swell ratio of from 1.35 to 1.50.
Dependencies are inferred from the claim text.