US4704491A
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US
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Liquid ethylene-alpha-olefin random copolymer, process for production thereof, and use thereof
Assignee: Mitsui Chemicals Inc
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Filing: 1986-03-25
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Granted: 1987-11-03
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Expires: 2006-03-25
Abstract
Abstract A liquid ethylene-alpha-olefin random copolymer, characterized in that (a) it has an ethylene unit content of 10 to 85 mole % and an alpha-olefin unit content of 15 to 90 mole %, (b) it has a low molecular weight, (c) it has a narrow molecular weight distribution, (d) the dispersion of the ethylene units and alpha-olefin units in the polymer chain is in the advanced state, and (e) the directions of bonding of the alpha-olefin units in the polymer chain are nearly the same. The copolymer is prepared by copolymerizing ethylene and an alpha-olefin having 3 to 20 carbon atoms in the presence of a catalyst comprising a compound of a transition metal of Group IVb of the periodic table and an aluminoxane. The copolymer is very useful as a synthetic lubricant oil.
Inventors
- 👤 Toshiyuki Tsutsui
- 👤 Mamoru Kioka
- 👤 Akinori Toyota
- 👤 Norio Kashiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:11
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08F10/00; C08F8/00; C08F8/04; C10; C10M; C10M107/00; C10M107/02; C10M107/06; C10M107/08; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; C08F4/65922; C08F4/65925
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
163 words
A liquid ethylene-alpha-olefin random copolymer consisting essentially of units derived from ethylene and an alpha-olefin having 3 to 20 carbon atoms, said copolymer being characterized in that (a) it has an ethylene unit content in the range of 10 to 85 mole% and an alpha-olefin unit content in the range of 15 to 90 mole%, (b) it has a number average molecular weight (M n ), measured by gel permeation chromatography, of 3×10 2 to 1×10 4 , (c) it has a molecular weight distribution (M w /M n ), determined by gel permeation chromatography, of not more than 2.5, (d) it has a B value, defined by the following equation (I), within the range defined by the following equation (II) ##EQU3## wherein P E represents the molar fraction of the ethylene component in the copolymer, P O is the molar fraction of the alpha-olefin component in the copolymer, P OE is the molar fraction of alpha-olefin/ethylene chains in the total dyad chains,
Claim 2
Dependent Claim
163 words
A liquid ethylene-alpha-olefin random copolymer consisting essentially of units derived from ethylene and an alpha-olefin having 3 to 20 carbon atoms, said copolymer being characterized in that (a) it has an ethylene unit content in the range of 10 to 85 mole% and an alpha-olefin unit content in the range of 15 to 90 mole%, (b) it has a number average molecular weight (M n ), measured by gel permeation chromatography, of 3×10 2 to 1×10 4 , (c) it has a molecular weight distribution (M w /M n ), determined by gel permeation chromatography, of not more than 2.5, (d) it has a B value, defined by the following equation (I), within the range defined by the following equation (II) ##EQU3## wherein P E represents the molar fraction of the ethylene component in the copolymer, P O is the molar fraction of the alpha-olefin component in the copolymer, P OE is the molar fraction of alpha-olefin/ethylene chains in the total dyad chains,
Claim 3
Dependent Claim
51 words
05≦B≦2 (II), (e) signals of αβ and βγ based on a methylene chain between two adjacent tertiary carbon atoms in the main chain of the copolymer are not observed in the 13 C-NMR spectrum of the copolymer, and (f) it has an iodine value in the range of 0 to 85.
Claim 4
Dependent Claim
51 words
05≦B≦2 (II), (e) signals of αβ and βγ based on a methylene chain between two adjacent tertiary carbon atoms in the main chain of the copolymer are not observed in the 13 C-NMR spectrum of the copolymer, and (f) it has an iodine value in the range of 0 to 85.
Claim 5
Dependent Claim
26 words
The copolymer of claim 1 which has an ethylene unit content of 20 to 80 mole% and an alpha-olefin unit content of 20 to 80 mole%.
Claim 6
Dependent Claim
26 words
The copolymer of claim 1 which has an ethylene unit content of 30 to 70 mole% and an alpha-olefin unit content of 30 to 70 mole%.
Claim 7
Dependent Claim
19 words
The copolymer of claim 1 which has a number average molecular weight of 5×10 2 to 5×10 3 .
Claim 8
Dependent Claim
16 words
The copolymer of claim 1 which has a molecular weight distribution of not more than 2.2.
Claim 9
Dependent Claim
27 words
The copolymer of claim 1 which has an ethylene unit content of not more than 50 mole% and a B value defined by the formula 1.0+0.3×P.sub.E ≦B≦1/(1-P.sub.E).
Claim 10
Dependent Claim
25 words
The copolymer of claim 1 which has an ethylene content of more than 50 mole% and a B value defined by the equation 1.3-0.3×P.sub.E ≦B≦1/P.sub.E.
Claim 11
Dependent Claim
17 words
The copolymer of claim 1 which has an iodine value in the range of 0 to 50.
Claim 12
Dependent Claim
14 words
A synthetic lubricant oil composed of the liquid ethylene-alpha-olefin random copolymer of claim 1.
Claim 13
Dependent Claim
22 words
The synthetic lubricant oil of claim 9 wherein the liquid ethylene-alpha-olefin type random copolymer has an iodine value of 0 to 0.3.
Claim 14
Dependent Claim
44 words
The synthetic lubricant oil of claim 9 wherein the liquid ethylene-alpha-olefin random copolymer is a hydrogenated product of the liquid ethylene-alpha-olefin random copolymer having an iodine value of not more than 80 and the hydrogenated copolymer has an iodine value of 0 to 0.3.
References Cited (Backward Citations)
US3598552A
Cited
US3660057A
Cited
US3672852A
Cited
US3679380A
Cited
EP0069951B1
Cited
US4507515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |