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US3676521A Expired / Lapsed US ⏱️ 0.0 years remaining

Synthetic lubricants from low molecular weight olefins

Assignee: Sunoco Inc
•
Filing: 1970-10-05
•
Granted: 1972-07-11
•
Expires: 1990-10-05
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Abstract

Abstract New ethylene-propylene copolymer oils containing 29-71 mol percent ethylene, the rest being at least substantially entirely propylene, said oils being of high viscosity index, low pour point, and high stability, are produced from monoolefin mixtures containing ethylene and propylene employing specified vanadiumaluminum or titanium-aluminum Ziegler-type catalyst systems. Hydrogen under pressure is used with the vanadium-aluminum catalyst system to control molecular weight. Oils of lubricating oil viscosity can be produced directly, or after cracking higher molecular weight oil, said cracking usually, but not necessarily, followed by hydrogenating. Dewaxing can be employed to reduce pour point. Oil fractions have similar desirable lubricating oil properties as the overall copolymer oil.

Inventors

  • 👤 Richard S Stearns
  • 👤 Irl N Duling
  • 👤 David S Gates

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 22:51
CPC Classifications
C; C10; C10M; C10M171/00; C10M171/002; C10M107/00; C10M107/02; C10M107/04; C10M2205/00; C10N; C10N2020/00; C10N2020/01

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 32 words
An ethylene-propylene copolymer oil according to claim 1 and having a maximum decrease in KV100 of 25 percent when subjected to the thermal stability test set forth in military specification MIL-H-27601A (USAF).
Claim 2
Dependent Claim 41 words
An ethylene-propylene copolymer oil according to claim 2 and having a maximum decrease in KV210 of 5 percent when subjected to sonic shear test in accordance with the Herein Modified ASTM Proposed Method of Test for Shear Stability of Polymer-Containing Oils.
Claim 3
Dependent Claim 17 words
The copolymer oil of claim 1 containing 40-60 mol percent ethylene, the rest being substantially entirely propylene.
Claim 4
Dependent Claim 16 words
The copolymer oil of claim 1 containing 40-50 mol percent ethylene, the rest being entirely propylene.
Claim 5
Dependent Claim 12 words
The copolymer oil of claim 2 having a KV210 of 2-10 cs.

References Cited (Backward Citations)

BE570843A Cited
US3370052A Cited
US3068306A Cited
US3168588A Cited
US3294766A Cited
US3328366A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-07-11 1976-01-10 1976-07-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-07-11 1980-01-10 1980-07-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-07-11 1984-01-10 1984-07-11 $7700.00 Window Closed / Lapsed

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