US4756843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer compositions usable as additives for lubricating oils
Assignee: IFP Energies nouvelles
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Filing: 1986-11-07
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Granted: 1988-07-12
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Expires: 2006-11-07
Abstract
Abstract Compositions of copolymers are disclosed containing 10 to 35% by weight of units derived from at least one vinylaromatic monomer, 5 to 15% by weight of units derived from at least one linear or branched alkyl methacrylate with 1 to 4 carbon atoms, 20 to 50% by weight of units derived from at least one linear alkyl methacrylate with 8 to 14 carbon atoms and 15 to 50% by weight of units derived from at least one linear alkyl methacrylate with 16 to 22 carbon atoms. The copolymer compositions have a weight average molecular weight of 100,000 to 400,000 and a polydispersity index in general of less than 5. They are prepared by any free-radical copolymerization method using for example azo or peroxide initiators. These compositions have the advantage of providing a better compromise between the characteristics required of a viscosity additive for lubricating oils.
Inventors
- 👤 Jacques Jarrin
- 👤 Magali Robine
- 👤 Guy Parc
- 👤 Francois Dawans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:54
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1812; C10M143/00; C10M143/10; C10M2205/00; C10M2205/04; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
120 words
A copolymer, usable as a viscosity additive for lubricating oils, characterized in that it consisting essentially of 10 to 35% by weight of units derived from at least one vinylaromatic monomer; 90 to 65% by weight of units derived from methacylic monomers of which: 5 to 15% by weight are derived from at least one linear or branched C 1 to C 4 alkyl methacrylate; 20 to 55% by weight are derived from at least one linear C 8 to C 14 alkyl methacrylate; 15 to 50% by weight are derived from at least one linear C 16 to C 22 alkyl methacrylate; these proportions by weight being expressed with respect to the total of the units constituting the copolymer.
Claim 2
Dependent Claim
120 words
A copolymer, usable as a viscosity additive for lubricating oils, characterized in that it consisting essentially of 10 to 35% by weight of units derived from at least one vinylaromatic monomer; 90 to 65% by weight of units derived from methacylic monomers of which: 5 to 15% by weight are derived from at least one linear or branched C 1 to C 4 alkyl methacrylate; 20 to 55% by weight are derived from at least one linear C 8 to C 14 alkyl methacrylate; 15 to 50% by weight are derived from at least one linear C 16 to C 22 alkyl methacrylate; these proportions by weight being expressed with respect to the total of the units constituting the copolymer.
Claim 3
Dependent Claim
21 words
A copolymer composition according to claim 1, characterized in that it has a weight average molecular weight of 100,000 to 400,000.
Claim 4
Dependent Claim
19 words
A copolymer composition according to claim 1, characterized in that it has a polydispersity index of less than 5.
Claim 5
Dependent Claim
15 words
A copolymer composition according to claim 1, characterized in that said vinylaromatic monomer is styrene.
Claim 6
Dependent Claim
78 words
A copolymer composition according to claim 4, characterized in that the units derived from at least one C 1 to C 4 alkyl methacrylate represent 5 to 10% by weight; the units derived from at least one C 8 to C 14 alkyl methacrylate represent 25 to 50% by weight; and the units derived from at least one C 16 to C 22 alkyl methacrylate represent 20 to 50% by weight of the total units constituting the copolymer.
Claim 7
Dependent Claim
21 words
A copolymer composition according to claim 1, characterized in that said C 1 to C 4 alkyl methacrylate is methyl methacrylate.
Claim 8
Dependent Claim
51 words
A copolymer composition according to claim 1, characterized in that the C 8 to C 14 alkyl methacrylate and the C 16 to C 22 alkyl methacrylate are derived from a commercial cut containing a preponderant proportion of lauryl methacrylate and a commercial cut containing a preponderant proportion of stearyl methacrylate.
Claim 9
Dependent Claim
139 words
A lubricating composition characterized in that it comprises a major proportion of lubricating oil and a minor proportion, sufficient to improve the viscosity properties, of at least one copolymer composition consisting essentially of 10 to 35% by weight of units derived from at least one vinylaromatic monomer; 90 to 65% by weight of units derived from methacrylic monomers of which: 5 to 15% by weight are derived from at least one linear or branched C 1 to C 4 alkyl methacrylate; monomers of which: 20 to 55% by weight are derived from at least one linear C 8 to C 14 alkyl methacrylate; 15 to 50% by weight are derived from at least one linear C 16 to C 22 alkyl methacrylate; these proportions by weight being expressed with respect to the total of the units constituting the copolymer.
Claim 10
Dependent Claim
139 words
A lubricating composition characterized in that it comprises a major proportion of lubricating oil and a minor proportion, sufficient to improve the viscosity properties, of at least one copolymer composition consisting essentially of 10 to 35% by weight of units derived from at least one vinylaromatic monomer; 90 to 65% by weight of units derived from methacrylic monomers of which: 5 to 15% by weight are derived from at least one linear or branched C 1 to C 4 alkyl methacrylate; monomers of which: 20 to 55% by weight are derived from at least one linear C 8 to C 14 alkyl methacrylate; 15 to 50% by weight are derived from at least one linear C 16 to C 22 alkyl methacrylate; these proportions by weight being expressed with respect to the total of the units constituting the copolymer.
Claim 11
Dependent Claim
28 words
A lubricating composition according to claim 8, characterized in that the proportion of the copolymer composition is 2 to 10% by weight with respect to the lubricating oil.
Claim 12
Dependent Claim
15 words
A copolymer composition according to claim 1, wherein the polydispersity index is 2.5 to 3.
Claim 13
Dependent Claim
27 words
A copolymer composition according to claim 1, comprising: 10% by weight styrene 8% by weight methyl methacrylate 57% by weight lauryl methacrylate 25% by weight stearyl methacrylate.
Claim 14
Dependent Claim
27 words
A copolymer composition according to claim 1, comprising: 20% by weight styrene 8% by weight methyl methacrylate 50% by weight lauryl methacrylate 22% by weight stearyl methacrylate.
Claim 15
Dependent Claim
27 words
A copolymer composition according to claim 1, comprising: 30% by weight styrene 8% by weight methyl methacrylate 43% by weight lauryl methacrylate 19% by weight stearyl methacrylate.
Claim 16
Dependent Claim
26 words
A copolymer composition according to claim 1, comprising: 20% by weight styrene 8% weight methyl methacrylate 32% by weight lauryl methacrylate 40% by weight stearyl methacrylate.
Claim 17
Dependent Claim
27 words
A copolymer composition according to claim 1, comprising: 10-30% by weight styrene 8% by weight methyl methacrylate 32-57% by weight lauryl methacrylate 19-40% by weight stearyl methacrylate.
Claim 18
Dependent Claim
23 words
A copolymer according to claim 4, wherein the units derived from styrene represents 15-25% by weight of the total units constituting the copolymer.
Claim 19
Dependent Claim
28 words
A copolymer according to claim 1, wherein the units derived from the vinyl aromatic monomer represent 15 to 25% by weight of the total units constituting the copolymer.
Claim 20
Dependent Claim
20 words
A copolymer according to claim 4, characterized in that said C 1 to C 4 alkyl methacrylate is methyl methacrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |