Patent US4873275A successfully refreshed from Google Patents.
US4873275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow resistant asphalt paving binder
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1987-12-18
•
Granted: 1989-10-10
•
Expires: 2007-12-18
Abstract
Abstract Paving binders, especially hot mix paving structures, may be modified to have both storage stability and increased creep resistance by the addition of copolymers of ethylene with vinyl acetate or lower alkyl esters of acrylic acid and methacrylic acid to the asphalt used in said binder, provided the asphalt has an asphaltene content of about 7 wt. % or less.
Inventors
- 👤 Lyle E. Moran
- 👤 Lawrence G. Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:15
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/026; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A storage stable and creep resistant asphalt paving binder which comprises (a) an asphalt having about 7 wt. % or less asphaltenes, and (b) from about 3.5 to about 10 wt. % of a copolymer consisting essentially of ethylene with at least one compound selected from the group of vinyl acetate, alkyl acrylate or alkyl methacrylate, wherein said copolymer has a melt index of from about 0.3 to about 20 g/10 mins. and contains from about 70 to about 97 wt. % ethylene.
Claim 2
Dependent Claim
83 words
A storage stable and creep resistant asphalt paving binder which comprises (a) an asphalt having about 7 wt. % or less asphaltenes, and (b) from about 3.5 to about 10 wt. % of a copolymer consisting essentially of ethylene with at least one compound selected from the group of vinyl acetate, alkyl acrylate or alkyl methacrylate, wherein said copolymer has a melt index of from about 0.3 to about 20 g/10 mins. and contains from about 70 to about 97 wt. % ethylene.
Claim 3
Dependent Claim
13 words
The binder of claim 1 wherein the alkyl is methyl, ethyl or butyl.
Claim 4
Dependent Claim
21 words
The binder of claim 2 wherein said copolymer has from about 0.3 to about 0.8 wt. % maleic anhydride grafted thereon.
Claim 5
Dependent Claim
35 words
The binder of claim 1 wherein said copolymer is ethylene with from about 3 to about 12 wt. % vinyl acetate and has a melt index of from about 1 to about 5 g/10 mins.
Claim 6
Dependent Claim
20 words
The binder of claim 4 wherein from about 4 to about 6 wt. % of said copolymer is present therein.
Claim 7
Dependent Claim
30 words
The binder of claim wherein said copolymer is ethylene with about 20 wt. % alkyl methacrylate and has a melt index of from about 3 to about 5 g/10 mins.
Claim 8
Dependent Claim
21 words
The binder of claim 6 wherein from about 0.3 to about 0.8 wt. % maleic anhydride is grafted onto said copolymer.
Claim 9
Dependent Claim
20 words
The binder of claim 7 wherein from about 4 to about 5 wt. % of said copolymer is present therein.
Claim 10
Dependent Claim
67 words
A pavement structure containing an asphalt paving binder which comprises an asphalt containing from 0 to about 7 wt. % asphaltenes and from about 3.5 to about 10 wt. % of a copolymer of vinyl acetate, alkyl acrylate or alkyl methacrylate, said copolymer having a melt index from about 0.3 to about 20 g/10 mins. and an ethylene content between about 70 and about 97 wt. %.
Claim 11
Dependent Claim
67 words
A pavement structure containing an asphalt paving binder which comprises an asphalt containing from 0 to about 7 wt. % asphaltenes and from about 3.5 to about 10 wt. % of a copolymer of vinyl acetate, alkyl acrylate or alkyl methacrylate, said copolymer having a melt index from about 0.3 to about 20 g/10 mins. and an ethylene content between about 70 and about 97 wt. %.
Claim 12
Dependent Claim
14 words
The pavement structure of claim 9 wherein the alkyl is methyl, ethyl or butyl.
Claim 13
Dependent Claim
22 words
The pavement structure of claim 9 wherein said copolymer has from about 0.3 to about 0.8 wt. % maleic anhydride grafted thereon.
References Cited (Backward Citations)
US3414533A
Cited
DE2406286A1
Cited
US3980598A
Cited
DE2546131A1
Cited
US4098739A
Cited
US4451598A
Cited
US4511889A
Cited
US4650820A
Cited
EP0162561A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |