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US4110235A
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Ethylene-hydrocarbon copolymeric viscosity improvers containing color and stability improvers
Assignee: Afton Chemical Additives Corp
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Filing: 1977-03-30
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Granted: 1978-08-29
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Expires: 1997-03-30
Abstract
Abstract The color and viscosity stability of copolymeric α-olefin viscosity index improvers and of oils containing same are improved by the incorporation therein of minor amounts of N,N'-bis(2-hydroxy-5-alkylbenzyl)α-Ω-diaminoethane wherein the alkyl group is a C 4 to C 30 alkyl group and the basic metal salts thereof.
Inventors
- 👤 James O. Waldbillig
- 👤 Carmen M. Cusano
- 👤 David D. Reed
- 👤 Richard L. Winstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:23
CPC Classifications
C; C10; C10M; C10M163/00; C10M2205/00; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/06; C10M2215/062; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10N; C10N2010/00; C10N2010/04; C10N2020/00; C10N2020/01; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
A color and viscosity stabilized, viscosity index improving additive package for a lubricating oil comprising a copolymeric ethylene-α-olefin viscosity index improver and from 0.005 to 5.0 weight percent of a stabilizer consisting of at least one compound of the group of N,N'-bis(2-hydroxy-5-alkylbenzyl)α,Ω-diaminoethane wherein said alkyl group contains from 4 to 30 carbon atoms and the calcium, barium, magnesium and zinc salts thereof.
Claim 2
Dependent Claim
62 words
A color and viscosity stabilized, viscosity index improving additive package for a lubricating oil comprising a copolymeric ethylene-α-olefin viscosity index improver and from 0.005 to 5.0 weight percent of a stabilizer consisting of at least one compound of the group of N,N'-bis(2-hydroxy-5-alkylbenzyl)α,Ω-diaminoethane wherein said alkyl group contains from 4 to 30 carbon atoms and the calcium, barium, magnesium and zinc salts thereof.
Claim 3
Dependent Claim
18 words
The composition according to claim 1, wherein the amount of stabilizer ranges from 0.01 to 1.0 weight percent.
Claim 4
Dependent Claim
60 words
An essentially haze free and color free lubricating composition containing from 99 to 25 percent by weight of a mineral oil; 1.0 to 75.0 percent by weight of an ethylene-α-olefin copolymer and from 0.005 to 5.0 weight percent of at least one color and viscosity stabilizer of the group of N,N-1-bis(2-hydroxy-5-alkylbenzyl)-α-Ωdiaminoethane and the calcium, barium, magnesium and zinc salts thereof.
Claim 5
Dependent Claim
60 words
An essentially haze free and color free lubricating composition containing from 99 to 25 percent by weight of a mineral oil; 1.0 to 75.0 percent by weight of an ethylene-α-olefin copolymer and from 0.005 to 5.0 weight percent of at least one color and viscosity stabilizer of the group of N,N-1-bis(2-hydroxy-5-alkylbenzyl)-α-Ωdiaminoethane and the calcium, barium, magnesium and zinc salts thereof.
Claim 6
Dependent Claim
20 words
The composition of claim 3, wherein the concentration of ethylene-α-olefin copolymer ranges from about 5 to about 30 weight percent.
Claim 7
Dependent Claim
33 words
The composition of claim 3, wherein said mineral oil has a Saybolt Universal Seconds viscosity of about 60 to about 200 at 100° F and a specific gravity of about 0.80 to 0.90.
Claim 8
Dependent Claim
18 words
The composition of claim 3, wherein the amount of said stabilizer ranges from 0.01 to 1.0 weight percent.
Claim 9
Dependent Claim
44 words
The composition of claim 3, wherein said copolymer is a copolymer of ethylene and propylene having a number average molecular weight between 10,000 and 50,000, a propylene content of 20 to 70 mole percent and a molecular weight distribution of less than about 4.
Claim 10
Dependent Claim
39 words
The composition of claim 3 containing a lubricating mineral oil having a Saybolt Universal Second viscosity of about 60 to about 500 at 100° F. and from 0.01 to 1.0 weight percent of the calcium salt of said diaminoethane.
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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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |