US4454269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing industrial grade asphalt using an asphalt-polymer blend
Assignee: Chevron USA Inc
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Filing: 1982-12-30
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Granted: 1984-06-12
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Expires: 2002-12-30
Abstract
Abstract A method for producing air-blown industrial asphalt using asphalt, ethylene/vinyl-acetate copolymer and an air-blowing catalyst is disclosed. The EVA copolymer is present in a weight percent of from 1 weight percent to 10 weight percent. Also disclosed is the asphalt composition resulting from the air-blowing method.
Inventors
- 👤 Judson E. Goodrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:31
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/04; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A method for producing industrial asphalt comprising the steps of: (a) preheating asphalt to a temperature of from 200° F. to 350° F.; (b) mixing thoroughly into the asphalt from about 1 weight percent to about 10 weight percent ethylene/vinyl-acetate copolymer (EVA) and from about 0.1 weight percent to about 5 weight percent of an air-blowing asphalt catalyst; (c) charging the asphalt/EVA/catalyst mixture into an asphalt air-blowing still; (d) heating the mixture to a temperature of from about 400° F. to about 550° F.; (e) blowing through the mixture gas selected from the group consisting of air, oxygen, and an oxygen/inert gas mixture for sufficient time to cause the asphalt mixture to reach a preselected softening point.
Claim 2
Independent Claim
117 words
A method for producing industrial asphalt comprising the steps of: (a) preheating asphalt to a temperature of from 200° F. to 350° F.; (b) mixing thoroughly into the asphalt from about 1 weight percent to about 10 weight percent ethylene/vinyl-acetate copolymer (EVA) and from about 0.1 weight percent to about 5 weight percent of an air-blowing asphalt catalyst; (c) charging the asphalt/EVA/catalyst mixture into an asphalt air-blowing still; (d) heating the mixture to a temperature of from about 400° F. to about 550° F.; (e) blowing through the mixture gas selected from the group consisting of air, oxygen, and an oxygen/inert gas mixture for sufficient time to cause the asphalt mixture to reach a preselected softening point.
Claim 3
Dependent Claim
29 words
A method for producing asphalt as claimed in claim 1 wherein the time for which the asphalt mixture is air-blown is from about 0.5 hours to about 12 hours.
Claim 4
Dependent Claim
18 words
A method as claimed in claim 2 wherein the air-blowing time is from about 1 to 3 hours.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 1 wherein the preselected softening point is from about 220°-240° F.
Claim 6
Dependent Claim
35 words
A method for producing industrial asphalt as claimed in claim 4 wherein the resulting asphalt has a penetration of from 15 to 20 at 77° F., dmm and a penetration index of greater than 2.
Claim 7
Dependent Claim
28 words
A method for producing industrial asphalt as claimed in claim 1 wherein the ethylene/vinyl-acetate copolymer is comprised of from about 35.0 to about 45.0 weight percent vinyl acetate.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 6 wherein the catalyst is selected from the group consisting of ferric chloride, phosphorus pentoxide, and phosphoric acid.
Claim 9
Dependent Claim
25 words
A method as claimed in claim 6 wherein the weight percent of ethylene/vinyl-acetate copolymer is from about 4 weight percent to about 6 weight percent.
Claim 10
Independent Claim
46 words
A method for producing industrial asphalt which comprises air-blowing at a temperature of between about 400° F. to about 550° F., a pre-blended mixture of asphalt, ethylene/vinyl-acetate copolymer, and an air-blowing asphalt catalyst, pre-blended at a temperature of between about 200° F. to about 350° F.
Claim 11
Independent Claim
46 words
A method for producing industrial asphalt which comprises air-blowing at a temperature of between about 400° F. to about 550° F., a pre-blended mixture of asphalt, ethylene/vinyl-acetate copolymer, and an air-blowing asphalt catalyst, pre-blended at a temperature of between about 200° F. to about 350° F.
Claim 12
Dependent Claim
35 words
A method as claimed in claim 9 wherein the ethylene/vinyl-acetate copolymer comprises from about 1 to about 10 weight percent and the catalyst comprises from about 0.1 to about 5 weight percent of the mixture.
Claim 13
Dependent Claim
12 words
An industrial asphalt produced by the method as claimed in claim 1.
Claim 14
Dependent Claim
12 words
An industrial asphalt produced by the method as claimed in claim 8.
Claim 15
Dependent Claim
10 words
An industrial asphalt produced by the method of claim 9.
Claim 16
Dependent Claim
40 words
An industrial asphalt as claimed in claim 11 having a softening point of from about 220° F. to 240° F., a penetration of from about 15 to about 20 at 77° F., dmm, and a penetration index greater than 2.
Claim 17
Dependent Claim
40 words
An industrial asphalt as claimed in claim 9 having a softening point of from about 220° F. to 240° F., a penetration of from about 15 to about 20 at 77° F., dmm, and a penetration index greater than 2.
References Cited (Backward Citations)
US3309329A
Cited
US3344101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |