EP0313386A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for producing ethylene copolymers
Assignee: Mitsubishi Chemical Corp
•
Filing: 1988-10-21
•
Granted: —
•
Expires: 2008-10-21
Abstract
Abstract A process for producing ethylene copolymers by copolymerizing ethylene with an α-olefin having 3 to 10 carbon atoms in the gas phase polymerization method in the presence of a catalyst comprising such a solid component, component (A), that a zirconium compound having formed a π-bonding with a conjugated five-membered ring such as bis(cyclopentadienyl)zirconium dichloride is carried on a support of porous particles of a water-insoluble inorganic oxide such as silica which have been preliminarily treated with an alumoxane, and an alumoxane, component (B), characterized in that the alumoxane as the component (B) is in the form of a solution in an aromatic hydrocarbon in a concentration of at least 5% (w/v) and the component (A) and the component (B) are introduced into a polymerization vessel after they have been contacted with each other.
Inventors
- 👤 Tadashi c/o Mitsubishi Petrochem.Co. Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 16:15
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/65916; C08F4/6592; C08F4/65922; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/941; Y10S526/943
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A process for producing ethylene copolymers by copolymerizing ethylene with an α-olefin having 3 to 10 carbon atoms in the gas phase polymerization method in the presence of a catalyst comprising such a solid component, component (A), that a zirconium compound having formed a π-bonding with a conjugated five-membered ring is carried on a support of a water-insoluble porous inorganic oxide particles which have been preliminarily treated with an alumoxane, and an alumoxane, component (B), characterized in that the alumoxane as the component (B) is in the form of a solution in an aromatic hydrocarbon in a concentration of at least 5% (w/v) and the component (A) and the component (B) are introduced into a polymerization vessel after they have been contacted with each other.
Claim 2
Dependent Claim
125 words
A process for producing ethylene copolymers by copolymerizing ethylene with an α-olefin having 3 to 10 carbon atoms in the gas phase polymerization method in the presence of a catalyst comprising such a solid component, component (A), that a zirconium compound having formed a π-bonding with a conjugated five-membered ring is carried on a support of a water-insoluble porous inorganic oxide particles which have been preliminarily treated with an alumoxane, and an alumoxane, component (B), characterized in that the alumoxane as the component (B) is in the form of a solution in an aromatic hydrocarbon in a concentration of at least 5% (w/v) and the component (A) and the component (B) are introduced into a polymerization vessel after they have been contacted with each other.
Claim 3
Dependent Claim
21 words
The process according to claim 1, wherein said alumoxane has 4 to 50 alkyl groups having 1 to 8 carbon atoms.
Claim 4
Dependent Claim
16 words
The process according to claim 1, wherein said alumoxane has 6 to 30 lower alkyl groups.
Claim 5
Dependent Claim
33 words
The process according to any one of claims 1 3, wherein the water-insoluble porous inorganic oxide particles are the particles of an oxide selected from the group consisting of silica, alumina and magnesia.
Claim 6
Dependent Claim
40 words
The process according to any one of claims 1 - 4, wherein the treatment of the water-insoluble porous inorganic oxide with the alumoxane comprises contacting the two at a temperature of 20 to 100°C for 30 minutes to 20 hours.
Claim 7
Dependent Claim
48 words
The process according to any one of claims 1 - 5, wherein the conjugated five-membered ring is a cyclopentadienyl group having 0 to 5 lower alkyl substituent(s) wherein when two lower alkyl substituents are present, they can form a ring by bonding to each other at their terminuses.
Claim 8
Dependent Claim
20 words
The process according to any one of claims 1 - 5, wherein the conjugated five-membered ring is an indenyl group.
Claim 9
Dependent Claim
39 words
The process according to any one of claims 1 - 7, wherein the zirconium compound which forms π-bonding with the conjugated five-membered ring is selected from the group consisting of bis(cyclopentadienyl)zirconium dichloride, bis(methylcyclopentadienyl)zirconium dichloride, bis(pentamethylcyclopentadienyl)zirconium dichloride, and bis(n-butylcyclopentadienyl)zirconium dichloride.
Claim 10
Dependent Claim
39 words
The process according to any one of claims 1 - 8, wherein the quantities of the component (A) and the component (B) used are such that the atomic ratio of Al/Zr is in the range of 150 to 10,000.
Claim 11
Dependent Claim
20 words
The process according to claim 9, wherein the atomic ratio of Al/Zr is in the range of 450 to 5,000.
Claim 12
Dependent Claim
35 words
The process according to any one of claims 1 - 10, wherein the component (A) and the component (B) are supplied to the polymerization vessel within 0.5 second to 1 hour after contacting the two.
Claim 13
Dependent Claim
30 words
The process according to any one of claims 1 - 11, wherein the α-olefin having 3 to 10 carbon atoms which is copolymerized with the ethylene is butene and/or hexene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.