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EP0452920A2
Expired / Lapsed
EP
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Process for the preparation of an ethylene copolymer and an olefin polymer, and catalysts for olefin polymerization
Assignee: Mitsui Chemicals Inc
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Filing: 1991-04-18
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Granted: —
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Expires: 2011-04-18
Abstract
Abstract The present invention provides an ethylene copolymer comprising constituent units (a) derived from ethylene and constituent units (b) derived from an alpha -olefin having 3 to 20 carbon atoms, the ethylene copolymer being characterized in that (A) the ethylene copolymer has a density (d) of 0.86 to 0.95 g/cm<3>; (B) the ethylene copolymer has a MFR of 0.001 to 50 g/10 min as measured at a temperature of 190 DEG C and a load of 2.16 kg; (C) the melt tension (MT) and MFR of the ethylene copolymer satisfy the relation log MT > -0.66log MFR + 0.6; and (D) the temperature (T) at which the exothermic curve of the ethylene copolymer measured by a differential scanning calorimeter (DSC) shows the highest peak and the density (d) satisfy the relation T < 400d - 250. t
Inventors
- 👤 Toshiyuki Tsutsui
- 👤 Ken Yoshitsugu
- 👤 Takashi Ueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 03:19
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08F212/00; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65904; C08F4/65912; C08F4/65916; C08F4/6592; C08F4/65922; C08F4/65927; C08L2205/00; C08L2205/02; C08L2314/00; C08L2314/06; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/904; Y10S526/905; Y10S526/943
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
An ethylene copolymer comprising constituent units (a) derived from ethylene and constituent units (b) derived from an α-olefin having 3 to 20 carbon atoms, which is characterized in that: (A) the ethylene copolymer has a density (d) of 0.86 to 0.95 g/cm³; (B) the ethylene copolymer has a MFR of 0.001 to 50 g/10 min as measured at a temperature of 190°C and a load of 2.16 kg; (C) the melt tension (MT) and MFR of the ethylene copolymer satisfy the relation log MT > -0.66log MFR + 0.6; and (D) the temperature (T) at which the exothermic curve of the ethylene copolymer measured by a differential scanning calorimeter (DSC) shows the highest peak and the density (d) satisfy the relation T < 400d - 250.
Claim 2
Dependent Claim
45 words
The ethylene copolymer as claimed in Claim 1, wherein the ethylene copolymer comprises the constituent units derived from ethylene in an amount of 70 to 96% by weight, and the constituent units derived from an α-olefin in an amount of 4 to 30% by weight.
Claim 3
Dependent Claim
138 words
A process for the preparation of an olefin polymer, which comprises polymerizing olefin in the presence of a solid catalyst formed from (A) a compound of a transition metal in Group IVB of the periodic table, having ligands comprising at least two groups each having a cyclopentadienyl skeleton, said at least two groups being crosslinked through a group containing carbon and/or silicon, and (B) an organoaluminum oxy-compound, under the condition that the produced polymer exists in a solid state in the polymerization system, to form an olefin polymer satisfying the following conditions: a) the olefin polymer has a MFR of 0.001 to 100 g/10 min at a temperature of 190°C and a load of 2.16 kg; and b) the melt tension (MT) and MFR of the olefin polymer satisfy the relation log MT > -0.66log MFR + 0.6.
Claim 4
Dependent Claim
142 words
A process for the preparation of an olefin polymer, which comprises polymerizing olefin in the presence of a solid catalyst formed from (A) a compound of a transition metal in Group IVB of the periodic table, having ligands comprising at least two groups each having a cyclopentadienyl skeleton, said at least two groups being crosslinked through a group containing carbon and/or silicon, (B) an organoaluminum oxy-compound, and (C) an organoaluminum compound, under the condition that the produced polymer exists in a solid state in the polymerization system, to form an olefin polymer satisfying the following conditions: a) the olefin polymer has a MFR of 0.001 to 100 g/10 min at a temperature of 190°C and a load of 2.16 kg; and b) the melt tension (MT) and MFR of the olefin polymer satisfy the relation log MT > -0.66log MFR + 0.6.
Claim 5
Dependent Claim
99 words
A prepolymerized solid catalyst for olefin polymerization characterized in that the solid catalyst is formed by prepolymerizing olefin in a suspension or a gas phase in the presence of a catalyst comprising [A] a fine particle carrier, [B] a transition metal compound containing ligands having a cyclopentadienyl skeleton, the cyclopentadienyl skeletons being not bonded mutually, [C] a transition metal compound containing at least two ligands each having a cyclopentadienyl skeleton, said at least two ligands being bonded together through an alkylene group, a substituted alkylene group, a silylene group or a substituted silylene group, and [D] an organoaluminum oxy-compound.
Claim 6
Dependent Claim
103 words
A prepolymerized solid catalyst for olefin polymerization characterized in that the solid catalyst is formed by prepolymerizing olefin in a suspension or a gas phase in the presence of a catalyst comprising [A] a fine particle carrier, [B] a transition metal compound containing ligands having a cyclopentadienyl skeleton, the cyclopentadienyl skeletons being not bonded mutually, [C] a transition metal compound containing at least two ligands each having a cyclopentadienyl skeleton, said at least two ligands being bonded together through an alkylene group, a substituted alkylene group, a silylene group or a substituted silylene group, [D] an organoaluminum oxy-compound, and [E] an organoaluminum compound.
Claim 7
Dependent Claim
29 words
A process for the polymerization of olefin, which comprises polymerizing or copolymerizing olefin in the presence of the prepolymerized solid catalyst for olefin polymerization as claimed in Claim 5.
Claim 8
Dependent Claim
29 words
A process for the polymerization of olefin, which comprises polymerizing or copolymerizing olefin in the presence of the prepolymerized solid catalyst for olefin polymerization as claimed in Claim 6.
Claim 9
Dependent Claim
33 words
A process for the polymerization of olefin, which comprises polymerizing or copolymerizing olefin in the presence of the prepolymerized solid catalyst for olefin polymerization as claimed in Claim 5 and an organoaluminum compound.
Claim 10
Dependent Claim
33 words
A process for the polymerization of olefin, which comprises polymerizing or copolymerizing olefin in the presence of a prepolymerized solid catalyst for olefin polymerization as claimed in Claim 6 and an organoaluminum compound.
References Cited (Backward Citations)
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