Patent US3635685A successfully refreshed from Google Patents.
US3635685A
Expired / Lapsed
US
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Pour point depressant
Assignee: Phillips Petroleum Co
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Filing: 1969-07-24
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Granted: 1972-01-18
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Expires: 1989-07-24
Abstract
Abstract Depression of the pour point of a normally liquid hydrocarbonaceous material is obtained by adding to the liquid a hydrogenated butadiene/styrene copolymer which contains a terminal group selected from the group consisting of hydroxy, carboxy and pyridyl, said copolymer having prior to hydrogenation a vinyl unsaturation corresponding to the proportion of styrene in the copolymer, and having a percent unsaturation subsequent to hydrogenation in the range of 1 to 15 percent.
Inventors
- 👤 Richard J Sonnenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:08
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/146; C10L1/16; C10L1/1625; C10L1/1633; C10L1/1658; C10L1/18; C10L1/192; C10L1/195; C10L1/22; C10L1/234; C10L1/236
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
20 words
A composition according to claim 1 wherein the butadiene/styrene ratio is in the range from about 80/20 to about 60/40.
Claim 2
Dependent Claim
13 words
A composition according to claim 2 wherein the butadiene/styrene ratio is about 70/30.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 wherein the copolymer contains about 1-10 percent olefinic unsaturation subsequent to hydrogenation.
Claim 4
Dependent Claim
18 words
A composition according to claim 4 wherein the copolymer contains about 1-5 percent olefinic unsaturation subsequent to hydrogenation.
Claim 5
Dependent Claim
42 words
A composition according to claim 1 wherein the additive is selected from terminated random and block copolymers of butadiene and styrene and is present in an amount in the approximate range of 0.005 to 0.5 weight percent of the liquid hydrocarbonaceous material.
Claim 6
Dependent Claim
29 words
A composition according to claim 6 wherein said additive is present in an amount in the approximate range of 0.01 to 0.1 weight percent of the liquid hydrocarbonaceous material.
Claim 7
Dependent Claim
24 words
A composition according to claim 7 wherein said additive is present in an amount of approximately 0.045 weight percent of the liquid hydrocarbonaceous material.
Claim 8
Dependent Claim
21 words
A composition according to claim 1 wherein the copolymer has a molecular weight in the approximate range of 5,000 to 50,000.
Claim 9
Dependent Claim
16 words
A composition according to claim 9 wherein the molecular weight is about 15,000 to about 30,000.
Claim 10
Dependent Claim
15 words
A composition according to claim 1 wherein the normally liquid hydrocarbonaceous material is diesel fuel.
Claim 11
Dependent Claim
124 words
A concentrate suitable for addition to a normally liquid hydrocarbonaceous material having a boiling range of 350* to 625* F. in order to depress the pour point thereof, said concentrate comprising: a. a hydrogenated butadiene/styrene copolymer having a molecular weight in the range of from about 1,000 to about 200,000 and containing a pyridyl terminal group; said copolymer, prior to hydrogenation, containing a vinyl unsaturation in accordance with the styrene content of the copolymer, said vinyl unsaturation being in the range of 42 to 8 percent, and said copolymer subsequent to hydrogenation containing olefinic unsaturation within the copolymer in the range of about 1-15 percent; and b. a solvent in which the polymerization of the butadiene/styrene copolymer and the hydrogenation thereof has been accomplished.
Claim 12
Dependent Claim
42 words
A concentrate according to claim 12 a. wherein the solvent is cyclohexane; b. wherein the quantity of hydrogenated copolymer comprises about 50 weight percent of said concentrate; and c. wherein the quantity of solvent comprises about 50 weight percent of said concentrate.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |