EP0273654B1
Expired / Lapsed
EP
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Unsaturated ethylene polymers
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1987-12-18
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Granted: 1994-02-23
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Expires: 2007-12-18
Abstract
Abstract Ethylene alpha, internal nonconjugated diene unsaturated 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. Ethylene/1,4-hexadiene and ethylene/vinyl cyclohexene polymers have residual unsaturation for subsequent modifications and for applications with improved toughness, printability, melt processability, and other advantageous characteristics.
Inventors
- 👤 Howard Curtis Welborn, Jr.
- 👤 Richard Graham Austin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:52
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: 11
Claim 1
Independent Claim
192 words
A process for preparing an interpolymer of ethylene and at least one comonomer having a molecular weight distribution of 3.0 or less comprising from 0.1 to 10 mole % of an alpha, internal non-conjugated diene and from 0 to 15 weight percent of an alpha-olefin which process includes polymerising ethylene and comonomer using a metallocene catalyst of the formula (Cp) m MR n R'p wherein Cp is a substituted cyclopentadienyl ring, M is group IVB, VB or VIB transition metal; R and R 1 are independently selected halogen, hydrocarbyl group or hydroxycarbyl groups having from 1-20 carbon atoms m = 1-3, n = 0-3 ; p = 0-3 and the sum of m + n + p equals the oxidation state of M and alumoxane, the resulting interpolymer having incorporated in its structure at least 3 mole percent units of said at least one comonomer and having a cluster index of 9 or less determined by the formula 10[(X)-(EXE)]/[2(X) 2- (X)- 3 ] where (X) is the mole % of total comonomer units in the copolymer and (EXE) is the mole fraction of the triad segment of 3 monomer units containing ethylene-comonomer-ethylene.
Claim 2
Dependent Claim
192 words
A process for preparing an interpolymer of ethylene and at least one comonomer having a molecular weight distribution of 3.0 or less comprising from 0.1 to 10 mole % of an alpha, internal non-conjugated diene and from 0 to 15 weight percent of an alpha-olefin which process includes polymerising ethylene and comonomer using a metallocene catalyst of the formula (Cp) m MR n R'p wherein Cp is a substituted cyclopentadienyl ring, M is group IVB, VB or VIB transition metal; R and R 1 are independently selected halogen, hydrocarbyl group or hydroxycarbyl groups having from 1-20 carbon atoms m = 1-3, n = 0-3 ; p = 0-3 and the sum of m + n + p equals the oxidation state of M and alumoxane, the resulting interpolymer having incorporated in its structure at least 3 mole percent units of said at least one comonomer and having a cluster index of 9 or less determined by the formula 10[(X)-(EXE)]/[2(X) 2- (X)- 3 ] where (X) is the mole % of total comonomer units in the copolymer and (EXE) is the mole fraction of the triad segment of 3 monomer units containing ethylene-comonomer-ethylene.
Claim 3
Dependent Claim
18 words
Process according to claim 1 include the resulting interpolymer has a molecular weight distribution of 2.5 or less.
Claim 4
Dependent Claim
42 words
Process according to claim 1 or claim 2 in which the resulting interpolymer has a comonomer composition distribution wherein more than 55 weight percent of the polymer is within 50 percent of the median comonomer content in mole percent, of said composition.
Claim 5
Dependent Claim
21 words
Process according to any of the preceding claims in which the resulting interpolymer has a cluster index of 7 or less.
Claim 6
Dependent Claim
25 words
Process acccording to any of the preceding claims in which the resulting interpolymer comprises at least 3 mole % of said at least one comonomer.
Claim 7
Dependent Claim
37 words
Process according to any of the preceding claims wherein the resulting interpolymer comprises units derived from ethylene, said alpha, internal, non-conjugated diene, and at least one other polymerisable unsaturated comonomer such as propylene, butene-1 or hexene-1 comonomer.
Claim 8
Dependent Claim
30 words
Process according to any of the preceding claims wherein the resulting interpolymer has incorporated in its structure at least 3 mole percent of units of said alpha, internal unconjugated diene.
Claim 9
Dependent Claim
25 words
Process according to any of the preceding claims wherein said resulting interpolymer comprises at least 5 mole percent units of said at least one comonomer.
Claim 10
Dependent Claim
18 words
Process according to any of the preceding claims wherein said diene is a linear diene such as 1,4-hexadiene.
Claim 11
Dependent Claim
19 words
Process according to any of the preceding claims wherein said diene is a cyclic diene such as vinyl cyclohexene.
References Cited (Backward Citations)
No citation records indexed.
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