US4904402A
Expired / Lapsed
US
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Oxidized sulfurized isobutylene lube oil additives
Assignee: Mobil Oil AS
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Filing: 1989-03-10
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Granted: 1990-02-27
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Expires: 2009-03-10
Abstract
Abstract Sulfurized isobutylene is reacted with a mild oxidizing agent under conditions sufficient to effect the appearance of new infra red frequency bands at 1300 cm -1 and 1030 cm -1 indicative of the formation of sulfoxides and sulfones and a liquid oxidized sulfurized isobutylene product soluble in a lubricating composition is recovered. The resulting purified product imparts improved bearing life when incorporated into lubricant compositions.
Inventors
- 👤 Costandi A. Audeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:13
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/02; C10M135/04; C07; C07G; C07G99/00; C07G99/002; C07G99/0022; C10M2219/00; C10M2219/02; C10M2219/022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A process for making a lubricant additive consisting of reacting a liquid sulfurized isobutylene with a mild oxidizing agent in a mole ratio of oxidizing agent to sulfurized isobutylene of between about 0.5 and about 2.5 moles of equivalent oxygen to 1 mole of sulfurized isobutylene at a reaction temperature between about 20° C. and about 95° C. under conditions sufficient to effect the appearance of new infra red frequency bands at 1300 cm -1 and 1030 cm -1 indicative of the formation of sulfoxides and sulfones and recovering a liquid oxidized sulfurized isobutylene product soluble in a lubricating composition.
Claim 2
Dependent Claim
100 words
A process for making a lubricant additive consisting of reacting a liquid sulfurized isobutylene with a mild oxidizing agent in a mole ratio of oxidizing agent to sulfurized isobutylene of between about 0.5 and about 2.5 moles of equivalent oxygen to 1 mole of sulfurized isobutylene at a reaction temperature between about 20° C. and about 95° C. under conditions sufficient to effect the appearance of new infra red frequency bands at 1300 cm -1 and 1030 cm -1 indicative of the formation of sulfoxides and sulfones and recovering a liquid oxidized sulfurized isobutylene product soluble in a lubricating composition.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein the sulfurized isobutylene is dissolved in a carrier liquid selected from the group consisting of benzene, toluene, xylenes and others which do not react with the oxidizing agent.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the oxidizing agent is an aqueous solution of hydrogen peroxide.
Claim 5
Dependent Claim
21 words
The process of claim 3 wherein the aqueous solution of hydrogen peroxide is acidified before being reacted with the sulfurized isobutylene.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the recovered reaction product is purified by washing with water.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the oxidizing agent is an aqueous solution of potassium or sodium permanganate.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the oxidizing agent is an aqueous solution of potassium or sodium dichromate.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the oxidizing agent is an aqueous solution of potassium or sodium iodate.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the oxidizing agent is an aqueous solution of a potassium or sodium perborate.
Claim 11
Dependent Claim
29 words
The process of claim 1 wherein the oxidizing agent is an aqueous solution of a per acid selected from the group consisting of perchloric, permanganic, permonosulfuric and persulfuric acid.
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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |