US4139397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paving grade asphalt compositions
Assignee: Mobil Oil AS
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Filing: 1977-05-27
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Granted: 1979-02-13
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Expires: 1997-05-27
Abstract
Abstract This invention provides a process for producing road paving asphalt compositions which involves heating an admixture of coal tar and fluidized catalytic cracking syntower bottoms until a homogeneous solubilized product with asphaltic properties is formed. The preferred asphalt compositions have a quantity of scrap rubber incorporated and dissolved therein.
Inventors
- 👤 Tsoung-Yuan Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:40
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/026; C08; C08L; C08L95/00; C08L2207/00; C08L2207/20; C08L2207/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A process for producing a paving grade asphalt composition which comprises forming a slurry of coal tar having a boiling point in the range between about 700° F. and 1000° F. and a thermally stable, highly refractory petroleum solvent having a boiling point above about 650° F., an average liable hydrogen content of about 0.3 percent or more, a benzylic hydrogen (alpha) content of about 1.5 percent or more, an aromatic hydrogen content of about 2 percent or more and a content of beta, gamma and other hydrogen of about 4 percent or less; and heating the slurry admixture thus formed to a temperature in the range between about 350° F. and 850° F. for a period of time sufficient to convert the slurry admixture into a homogeneous composition exhibiting asphaltic properties at ambient temperatures and having an ASTM penetration value of 40-300 at 77° F.
Claim 2
Dependent Claim
146 words
A process for producing a paving grade asphalt composition which comprises forming a slurry of coal tar having a boiling point in the range between about 700° F. and 1000° F. and a thermally stable, highly refractory petroleum solvent having a boiling point above about 650° F., an average liable hydrogen content of about 0.3 percent or more, a benzylic hydrogen (alpha) content of about 1.5 percent or more, an aromatic hydrogen content of about 2 percent or more and a content of beta, gamma and other hydrogen of about 4 percent or less; and heating the slurry admixture thus formed to a temperature in the range between about 350° F. and 850° F. for a period of time sufficient to convert the slurry admixture into a homogeneous composition exhibiting asphaltic properties at ambient temperatures and having an ASTM penetration value of 40-300 at 77° F.
Claim 3
Dependent Claim
23 words
A process in accordance with claim 1 wherein the slurry admixture is heated for a period of time up to about 3 hours.
Claim 4
Dependent Claim
38 words
A process in accordance with claim 1 wherein the petroleum solvent component in the slurry admixture is present in a quantity between about 0.2 and 20 parts by weight per part by weight of the coal tar component.
Claim 5
Dependent Claim
14 words
A paving grade asphalt composition produced in accordance with the process of claim 1.
Claim 6
Dependent Claim
139 words
A process for producing a ductile synthetic paving grade asphalt composition which comprises forming a slurry of coal tar having a boiling point between about 700° F. and 1000° F. and comminuted scrap rubber in a thermally stable highly refractory petroleum solvent having a boiling point above about 650° F., an average liable hydrogen content of about 0.3 percent or more, a benzylic hydrogen (alpha) content of about 1.5 percent or more and a content of beta, gamma and other hydrogen of about 4 percent or less; and heating the slurry admixture thus formed to a temperature in the range between about 350° F. and 850° F. for a period of time sufficient to convert the slurry admixture into a homogeneous composition stable, asphaltic properties at ambient temperatures and having an ASTM penetration value of 40-300 at 77° F.
Claim 7
Dependent Claim
139 words
A process for producing a ductile synthetic paving grade asphalt composition which comprises forming a slurry of coal tar having a boiling point between about 700° F. and 1000° F. and comminuted scrap rubber in a thermally stable highly refractory petroleum solvent having a boiling point above about 650° F., an average liable hydrogen content of about 0.3 percent or more, a benzylic hydrogen (alpha) content of about 1.5 percent or more and a content of beta, gamma and other hydrogen of about 4 percent or less; and heating the slurry admixture thus formed to a temperature in the range between about 350° F. and 850° F. for a period of time sufficient to convert the slurry admixture into a homogeneous composition stable, asphaltic properties at ambient temperatures and having an ASTM penetration value of 40-300 at 77° F.
Claim 8
Dependent Claim
23 words
A process in accordance with claim 5 wherein the slurry admixture is heated for a period of time up to about 3 hours.
Claim 9
Dependent Claim
42 words
A process in accordance with claim 5 wherein the ratio of scrap rubber to coal tar in the slurry admixture is in the range between about 0.01 and 5 parts by weight of scrap rubber per part by weight of coal tar.
Claim 10
Dependent Claim
46 words
A process in accordance with claim 5 wherein the petroleum solvent component in the slurry admixture is present in a quantity between about 0.2 and 20 parts by weight per part of the combined weight of coal tar and scrap rubber components in the slurry admixture.
Claim 11
Dependent Claim
16 words
A ductile synthetic paving grade asphalt composition produced in accordance with the process of claim 5.
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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |