EP0237294A2
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EP
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Process for preparing ethylene polymers
Assignee: Eneos Corp
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Filing: 1987-03-06
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Granted: —
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Expires: 2007-03-06
Abstract
Abstract A process for preparing an ethylene polymer by a two-stage polymerization of ethylene or ethylene and an a-olefin in an inert hydrocarbon at 50-100°C using a coordination polymerization catalyst containing a solid component and an organoaluminum compound, said solid component containing a transition metal compound, which process comprises: (a) in a first stage, producing 10-90% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.0001 to 0.5 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid product obtained by supporting chromium trioxide or a compound which on calcining forms chromium oxide at least partially, on an inorganic oxide carrier followed by calcining, and using as said organoaluminum compound a compound of the general formula wherein R is a hydrocarbon radical having 1 to 18 carbon atoms and n is 2 5 n ≦ 100; and (b) in a second stage, producing 90-10% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.01 to 50 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid material containing at least magnesium and titanium, and using as said organoaluminum compound a compound of the general formula AIR'pX 3 - P wherein R' is a hydrocarbon radical having 1 to 20 carbon atoms, X is halogen and/or alkoxy and p is 0 < p ≦ 3, in the presence of the polymer obtained in the first stage. Alternatively the solid component of (a) also contains magnesium and titanium and step (b) is effected simply by adding the compound of the formula AIR'pX 3 -p after completion of the first stage polymerisation.
Inventors
- 👤 Yoshio Tajima
- 👤 Kazutosi Nomiyama
- 👤 Yoshinori Nishikitani
- 👤 Nobuyuki Kuroda
- 👤 Kazuo Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 19:52
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F110/00; C08F110/02; C08F210/00; C08F210/16; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
261 words
A process for preparing an ethylene polymer by a two-stage polymerization of ethylene or ethylene and an a-olefin in an inert hydrocarbon at 50-100°C using a coordination polymerization catalyst containing a solid component and an organoaluminum compound, said solid component containing a transition metal compound, which process comprises: (a) in a first stage, producing 10-90 0 /o by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.0001 to 0.5 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid product obtained by supporting chromium trioxide or a compound which on calcining forms chromium oxide at least partially, on an inorganic oxide carrier followed by calcining, and using as said organoaluminum compound a compound of the general formula wherein R is a hydrocarbon radical having 1 to 18 carbon atoms and n is 2 ≦ n ≦ 100; and (b) in a second stage, producing 90-10% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.01 to 50 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid material containing at least magnesium and titanium, and using as said organoaluminum compound a compound of the general formula AlR'pX 3 -p wherein R' is a hydrocarbon radical having 1 to 20 carbon atoms, X is halogen and/or alkoxy and p is 0 < p ≦ 3, in the presence of the polymer obtained in the first stage.
Claim 2
Dependent Claim
261 words
A process for preparing an ethylene polymer by a two-stage polymerization of ethylene or ethylene and an a-olefin in an inert hydrocarbon at 50-100°C using a coordination polymerization catalyst containing a solid component and an organoaluminum compound, said solid component containing a transition metal compound, which process comprises: (a) in a first stage, producing 10-90 0 /o by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.0001 to 0.5 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid product obtained by supporting chromium trioxide or a compound which on calcining forms chromium oxide at least partially, on an inorganic oxide carrier followed by calcining, and using as said organoaluminum compound a compound of the general formula wherein R is a hydrocarbon radical having 1 to 18 carbon atoms and n is 2 ≦ n ≦ 100; and (b) in a second stage, producing 90-10% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.01 to 50 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid material containing at least magnesium and titanium, and using as said organoaluminum compound a compound of the general formula AlR'pX 3 -p wherein R' is a hydrocarbon radical having 1 to 20 carbon atoms, X is halogen and/or alkoxy and p is 0 < p ≦ 3, in the presence of the polymer obtained in the first stage.
Claim 3
Dependent Claim
235 words
A process for preparing an ethylene polymer by a two-stage polymerization of ethylene or ethylene and an a-olefin in an inert hydrocarbon at 50-100°C using a coordination polymerization catalyst containing a solid component and an organoaluminum compound, said solid component containing a transition metal compound, which process comprises: (a) in a first stage, producing 10-90 0 /o by weight based on the melt index in the range of 0.0001 to 0.5 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid product and a solid material containing at least magnesium and titanium, said solid product being obtained by supporting chromium trioxide or a compound which on calcining forms chromium oxide at least partially, on an inorganic oxide carrier followed by calcining, and using as said organoaluminum compound a compound of the general formula wherein R is a hydrocarbon radical having 1 to 18 carbon atoms and n is 2 ≦ n < 100; and (b) in a second stage, producing 90-10% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.01 to 50 g/10 min, by adding a compound of the general formula AlR'pX 3 -p wherein R' is a hydrocarbon radical having 1 to 20 carbon atoms, X is halogen and/or alkoxy and p is 0 < p < 3, after completion of the first-stage polymerization.
Claim 4
Dependent Claim
235 words
A process for preparing an ethylene polymer by a two-stage polymerization of ethylene or ethylene and an a-olefin in an inert hydrocarbon at 50-100°C using a coordination polymerization catalyst containing a solid component and an organoaluminum compound, said solid component containing a transition metal compound, which process comprises: (a) in a first stage, producing 10-90 0 /o by weight based on the melt index in the range of 0.0001 to 0.5 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid product and a solid material containing at least magnesium and titanium, said solid product being obtained by supporting chromium trioxide or a compound which on calcining forms chromium oxide at least partially, on an inorganic oxide carrier followed by calcining, and using as said organoaluminum compound a compound of the general formula wherein R is a hydrocarbon radical having 1 to 18 carbon atoms and n is 2 ≦ n < 100; and (b) in a second stage, producing 90-10% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.01 to 50 g/10 min, by adding a compound of the general formula AlR'pX 3 -p wherein R' is a hydrocarbon radical having 1 to 20 carbon atoms, X is halogen and/or alkoxy and p is 0 < p < 3, after completion of the first-stage polymerization.
Claim 5
Dependent Claim
37 words
A process as set forth in Claim 1 or Claim 2, wherein the amount of the polymer produced in the first stage is in the range of 20% to 80% by weight of the total polymer quantity.
Claim 6
Dependent Claim
38 words
A process as set forth in claim 1, claim 2 or claim 3, wherein R is an alkyl group having 1 to 18 carbon atoms and each R' is an alkyl group having 1 to 20 carbon atoms.
Claim 7
Dependent Claim
53 words
A process as set forth in any one of claims 1 to 4, wherein the compound of the general formula is a compound obtained by reacting water with R 3 AI in a water/Al mol ratio in the range of 0.25/1 to 1.2/1 at a temperature in the range of -70° to 100°C.
Claim 8
Dependent Claim
38 words
A process as set forth in any one of claims 1 to 5, wherein the compound of the general formula is used in an amount in the range of 1000/1 to 1/1 in terms of Al/Cr mol ratio.
Claim 9
Dependent Claim
37 words
A process as set forth in any one of claims 1 to 6, wherein the first- and second-stage polymerizations are carried out in an inert hydrocarbon solvent at a temperature in the range of 50° to 100°C.
Claim 10
Dependent Claim
22 words
A shaped article moulded or formed from a polymer obtained by the process claimed in any one of claims 1 to 7.
References Cited (Backward Citations)
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