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US3772196A
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Lubricating compositions
Assignee: Shell USA Inc
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Filing: 1971-12-03
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Granted: 1973-11-13
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Expires: 1991-12-03
Abstract
Abstract Lubricating oil compositions for internal combustion engines having unexpectedly wide temperature operating characteristics, contain a combination of 2-block copolymer comprising a first polymer block of an alkenyl arene, e.g., styrene and a second essentially completely hydrogenated polymer block of isoprene and certain pour point depressants in a lubricant base stock having a viscosity index of at least 85. The compositions have excellent shear stability and can be formulated to pass a number of the ASTM and SAE engine oil performance and engine service classifications.
Inventors
- 👤 D Clair
- 👤 D Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
C; C10; C10M; C10M157/00; C10M157/04; C08; C08L; C08L53/00; C08L53/02; C08L53/025; C10M2203/00; C10M2203/10; C10M2203/102; C10M2203/108; C10M2205/00; C10M2205/06; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/028; C10M2207/26; C10M2207/262; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/104; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/086; C10M2215/14; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; C10M2217/028; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2219/08; C10M2219/082; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/045; C10M2223/06; C10M2223/065; C10M2229/00; C10M2229/04; C10M2229/041; C10N; C10N2010/00; C10N2010/04; C10N2010/08; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
a single hydrogenated polymer block B, said block, prior to hydrogenation, being a polyisoprene block; at least about 95 percent of the olefinic unsaturation of block B being reduced by hydrogenation; said block B having an average molecular weight between about 20,000 and about 100,000; the weight ratio of block A to block B being between about 0.45:1 and about 0.8:1; any remaining blocks in the block copolymer having a total average molecular weight not exceeding about 7, 500, being selected from alkenyl arene polymer blocks and conjugated diene polymer blocks each having the monomer identity and hydrogenation limitations recited for blocks A and B.
Claim 2
Dependent Claim
49 words
A lubricating oil composition according to claim 1 comprising a. a major amount of a mineral lubrication oil; b. a minor but effective amount of a pour point depressant for said oil; and c. 0.1-10 percent by weight of a block copolymer having the structure A - B wherein
Claim 3
Dependent Claim
34 words
B is hydrogenated polymer block comprising, prior to hydrogenation, at least 75 percent by weight of condensed isoprene units, at least 95 percent of the olefinic unsaturation in said block being reduced by hydrogenation.
Claim 4
Dependent Claim
27 words
B is a hydrogenated homopolyisoprene block having an average molecular weight between about 35,000 and about 80,000; the weight ratio of A:B being between 0.5:1 and 0.7:1.
Claim 5
Dependent Claim
151 words
A lubricating oil composition according to claim 2 wherein the pour point depressant is an oil-soluble copolymer of (1) a monovinyl-substituted pyridine of the group consisting of pyridines substituted on one of the ring carbon atoms with, as the sole substituted substituent, a vinyl group, and derivatives of the afore-described vinyl pyridines having a lower alkyl group substituted on a ring carbon atom and (2) a mixture of a C16 to C20 alkyl ester of an acrylic acid of the group consisting of acrylic acid and methacrylic acid and a C10 to C14 alkyl ester of an acrylic acid of the group consisting of acrylic acid and methacrylic acid in mole ratios varying from 1:4 to 4:1, said copolymer having the monovinyl pyridine and the combined acrylic acid esters in a mole ratio varying from 1:2 to 1:10, respectively, and a molecular weight from 5 X 104 to 2.5 X 106.
Claim 6
Dependent Claim
17 words
A lubricating oil composition according to claim 3 wherein the block copolymer has the structure A-B wherein
Claim 7
Dependent Claim
24 words
A lubricating oil composition according to claim 3 wherein the pour point depressant is a copolymer of 2-methyl-5-vinyl pyridine, lauryl methacrylate and stearyl methacrylate.
Claim 8
Dependent Claim
28 words
A lubricating oil composition according to claim 1 wherein the composition has a viscosity of less than 24 poises at 0*F and more than 58 SUS at 210*F.
Claim 9
Dependent Claim
20 words
A lubricating oil composition according to claim 6 wherein the composition has a viscosity more than 85 SUS at 210*F.
Claim 10
Dependent Claim
27 words
A lubricating oil composition according to claim 6 wherein the lubricating oil consists essentially of fractions having a viscosity of at least about 95 SUS at 100*F.
Claim 11
Dependent Claim
37 words
A composition according to claim 7, which comprises in addition: a. 0.1-3.0 percent oil-soluble metal thiophosphate; b. 0.1-8.5 percent oil-soluble essentially ashless detergent; and c. a rust-inhibiting amount of an oil-soluble basic alkaline earth metal hydrocarbon sulfonate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |