US4490267A
Expired / Lapsed
US
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Preparation of a lubricating oil additive, an additive thus prepared _and a lubricating oil containing this additive
Assignee: Shell USA Inc
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Filing: 1983-06-13
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Granted: 1984-12-25
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Expires: 2003-06-13
Abstract
Abstract Lubricating oil additives having superior viscometric and detergent properties are prepared by polymerizing an alkyl(meth)acrylate in a solvent containing a star-shaped polymer.
Inventors
- 👤 Rudolf J. A. Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:47
CPC Classifications
C; C10; C10M; C10M149/00; C10M149/02; C10M149/10; C10M143/00; C10M143/10; C10M143/12; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C10M2205/00; C10M2205/04; C10M2205/06; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
191 words
A process for the preparation of a lubricating oil additive comprising polymerizing one or more C 1-30 -alkyl(meth)acrylates, and optionally at least one further monomer in a solvent, preferably a base oil, containing an at least partially hydrogenated polymer of a conjugated diene and optionally a monoalkenyl arene, wherein said polymer is a star-shaped polymer comprising a nucleus and polymeric arms linked to said nucleus wherein said arms are selected from the group consisting of: (i) at least partially hydrogenated homopolymers and at least partially hydrogenated copolymers of conjugated dienes; (ii) at least partially hydrogenated copolymers of conjugated dienes and monoalkenyl arenes; (iii) homopolymers and copolymers of alkenyl arenes; and (iv) mixtures thereof, wherein, the molar ratio of the acrylate and the further monomer(s) is between about 10:0 to about 10:5; the solvent is selected from the group consisting of base oil, C 18 -alkylxylenes and less substituted benzenes; at the start of the process the reaction mixture contains 0.5 to 35 percent by weight of the star-shaped polymer and 5 to 50 percent by weight of the acrylate; and the polymerization temperature is between about 50° and about 150° C.
Claim 2
Dependent Claim
191 words
A process for the preparation of a lubricating oil additive comprising polymerizing one or more C 1-30 -alkyl(meth)acrylates, and optionally at least one further monomer in a solvent, preferably a base oil, containing an at least partially hydrogenated polymer of a conjugated diene and optionally a monoalkenyl arene, wherein said polymer is a star-shaped polymer comprising a nucleus and polymeric arms linked to said nucleus wherein said arms are selected from the group consisting of: (i) at least partially hydrogenated homopolymers and at least partially hydrogenated copolymers of conjugated dienes; (ii) at least partially hydrogenated copolymers of conjugated dienes and monoalkenyl arenes; (iii) homopolymers and copolymers of alkenyl arenes; and (iv) mixtures thereof, wherein, the molar ratio of the acrylate and the further monomer(s) is between about 10:0 to about 10:5; the solvent is selected from the group consisting of base oil, C 18 -alkylxylenes and less substituted benzenes; at the start of the process the reaction mixture contains 0.5 to 35 percent by weight of the star-shaped polymer and 5 to 50 percent by weight of the acrylate; and the polymerization temperature is between about 50° and about 150° C.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 wherein the base oil is a mineral base oil.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 1 wherein at least about 80% of the aliphatic unsaturation of the star-shaped polymer has been reduced by hydrogenation while less than 20% of the aromatic unsaturation has been reduced.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1 wherein the nucleus of the star-shaped polymer is a poly(polyvinylaromatic)nucleus.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1 wherein each polymeric arm of the star-shaped polymer is a hydrogenated polyisoprene homopolymer.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 1 wherein a C 4-22 -alkylmethacrylate is polymerized.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 1 wherein the further monomer is a monomer having polar groups.
Claim 9
Dependent Claim
16 words
A process as claimed in claim 7 wherein said monomer is a nitrogen containing heterocyclic monomer.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 8 wherein the nitrogen-containing heterocyclic monomer is selected from the group consisting of vinylpiperidine, vinylmorpholine, vinylpiperazine, vinylpyridine, vinylpyrrolidone, vinylpyrrole, vinylbenzopyrrole, vinylquinoline, vinylindole, 2-methyl-5-vinylpyridine and N-vinylimidazole.
Claim 11
Dependent Claim
18 words
A process as claimed in claim 9 wherein the nitrogen-containing heterocyclic monomer is 2-vinylpyridine, 4-vinylpyridine, N-vinylpyrrolidone or N-vinylimidazole.
Claim 12
Dependent Claim
25 words
A process as claimed in claim 1 wherein the reaction mixture contains 0.5 to 35%w of the star-shaped polymer at the start of the process.
Claim 13
Dependent Claim
24 words
A process as claimed in claim 1 wherein the reaction mixture contains 5 to 50%w of the acrylate at the start of the process.
Claim 14
Dependent Claim
24 words
A process as claimed in claim 1 wherein the acrylate is polymerized at 50° to 150° C. in the presence of a polymerization initiator.
Claim 15
Dependent Claim
22 words
A process as claimed in claim 1 wherein the molar ratio of the acrylate and the further monomer is 10:0 to 10.5.
Claim 16
Dependent Claim
14 words
A lubricating oil additive whenever prepared by a process as claimed in claim 1.
Claim 17
Dependent Claim
25 words
A lubricating oil containing an additive as claimed in claim 15 wherein the additive concentration is between about 0.5 and about 50 percent by weight.
References Cited (Backward Citations)
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |