EP0273655A2
Expired / Lapsed
EP
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Ethylene copolymers
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1987-12-18
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Granted: —
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Expires: 2007-12-18
Abstract
Abstract Ethylene/1,5-hexadiene copolymers and higher interpolymers having structural characteristics that provide improved physical properties and processability. The ethylene polymers of the invention have narrow molecular weight distribution and/or narrow composition distribution and/or a low cluster index. The 1,5-hexadiene comonomer is predominantly incorporated as a cyclic ring in the polyethylene backbone but may also form long chain branching and intermolecular coupling without crosslinking to a gel.
Inventors
- 👤 Howard Curtis Welborn
- 👤 Richard Graham Austin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 13:28
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/16; C08F210/18; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F210/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
Uncrosslinked copolymer from the polymerisation of ethylene and at least one other polymerisable comonomer comprising 1,5-hexadiene and from 0 to 15% of an alpha olefin (other than ethylene), said copolymer incorporating in its structure at least about 3 mole percent of said at least one polymerisable comonomer and having a cluster index of about 9 or less.
Claim 2
Dependent Claim
57 words
Uncrosslinked copolymer from the polymerisation of ethylene and at least one other polymerisable comonomer comprising 1,5-hexadiene and from 0 to 15% of an alpha olefin (other than ethylene), said copolymer incorporating in its structure at least about 3 mole percent of said at least one polymerisable comonomer and having a cluster index of about 9 or less.
Claim 3
Dependent Claim
19 words
Copolymer according to claim 1 incorporating in its structure at least about 5 mole percent of said polymerisable comonomer.
Claim 4
Dependent Claim
35 words
Copolymer according to claim 1 or claim 2 wherein said 1,5-hexadiene is incorporated in at least about 0.1 mole percent, preferably at least about 3 mole percent and especially at least about 5 mole percent.
Claim 5
Dependent Claim
20 words
Copolymer according to any of the preceding claims wherein said at least one polymerisable comonomer consists essentially of said 1,5-hexadiene.
Claim 6
Dependent Claim
21 words
Copolymer according to any of the preceding claims wherein said composition is greater than 98 weight % soluble in refluxing xylene.
Claim 7
Dependent Claim
23 words
Copolymer according to any of the preceding claims having a molecular weight distribution (M w /M n ) of about 3.0 or less.
Claim 8
Dependent Claim
55 words
Copolymer according to any of claims 1 to 6 wherein the majority of said 1,5-hexadiene is incorporated in the polyethylene chain as cyclopentane structure I: having a molecular weight (M n ) of about 500 to about 1,000,000, preferably having a molecular weight of about 500-200,000 and being substantially entirely devoid of long chain branching.
Claim 9
Dependent Claim
27 words
Copolymer according to any of the preceding claims having a cluster index of about 9 or less, preferably having a cluster index of about 5 or less.
Claim 10
Dependent Claim
73 words
Composition containing a copolymer according to any of the preceding claims having a composition distribution wherein at least about 55 weight % of the copolymer composition molecules have a comonomer content within about 50% of the median comonomer content in mole percent of said copolymer composition, preferably with at least about 70 weight % of the copolymer molecules having a comonomer content within about 50% of the median comonomer content of said composition.
Claim 11
Dependent Claim
30 words
Composition according to any of claims 1 to 6 having a molecular weight of about 1000 to 1,000,000, containing long chain branching/intermolecular coupling, and being substantially devoid of linear molecules.
Claim 12
Dependent Claim
62 words
Method for preparing copolymers of ethylene and 1,5-hexadiene comprising carrying out the polymerisation in the presence of a metallocene/alumoxane catalyst system and forming an uncrosslinked ethylene/1,5-hexadiene copolymer composition having an alpha olefin content less than 15 weight percent, preferably by copolymerising 50-99 mole parts ethylene, 1-50 mole parts 1,5-hexadiene, and 0-50 mole parts polymerisable termonomer, said polymerisable termonomer being an alpha olefin.
Claim 13
Dependent Claim
62 words
Method for preparing copolymers of ethylene and 1,5-hexadiene comprising carrying out the polymerisation in the presence of a metallocene/alumoxane catalyst system and forming an uncrosslinked ethylene/1,5-hexadiene copolymer composition having an alpha olefin content less than 15 weight percent, preferably by copolymerising 50-99 mole parts ethylene, 1-50 mole parts 1,5-hexadiene, and 0-50 mole parts polymerisable termonomer, said polymerisable termonomer being an alpha olefin.
References Cited (Backward Citations)
No citation records indexed.
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