US4868233A
Expired / Lapsed
US
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Polyethylene modified asphalts
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1987-07-15
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Granted: 1989-09-19
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Expires: 2007-07-15
Abstract
Abstract The present invention relates to an improved polyethylene modified asphaltic composition and a method for its manufacture. More specifically, when certain linear polyethylene compounds are added to an asphalt that is low in asphaltenes but relatively high in saturates, there results a composition which has excellent storage stability, phase compatibility and creep resistance relative to unmodified asphalts. The improved asphaltic composition is particularly well suited for use as a binder in paving materials and as a coating or saturant for roofing products.
Inventors
- 👤 Lyle E. Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:13
CPC Classifications
C; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
54 words
A storage stable and creep resistant asphalt composition which comprises (a) asphalt, and (b) at least about 4 wt.% of at least one linear polyethylene polymer, wherein the weight ratio of the saturates to asphaltenes in said asphalt is above about 5.7 and below that at which phase separation of said composition will occur.
Claim 2
Dependent Claim
54 words
A storage stable and creep resistant asphalt composition which comprises (a) asphalt, and (b) at least about 4 wt.% of at least one linear polyethylene polymer, wherein the weight ratio of the saturates to asphaltenes in said asphalt is above about 5.7 and below that at which phase separation of said composition will occur.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein from about 4 to about 25 wt.% of said linear polyethylene polymer is present in said asphalt.
Claim 4
Dependent Claim
36 words
The composition of claim 1 wherein said linear polyethylene polymer is selected from the group consisting of linear very low density polyethylene polymers, linear low density polyethylene polymers, linear high density polyethylene polymers, and mixtures thereof.
Claim 5
Dependent Claim
55 words
The composition of claim 3 wherein said linear very low density polyethylene polymers have a melt index of at least about 3 g/10 mins., said linear low density polyethylene polymers have a melt index above 8 g/10 mins., said linear high density polyethylene polymers have a melt index of at least about 6.7 g/10 mins.
Claim 6
Dependent Claim
11 words
The composition of claim 1 wherein said asphalt comprises vacuum residua.
Claim 7
Dependent Claim
23 words
The composition of claim 1 wherein the weight ratio of saturates to asphaltenes in said asphalt ranges from about 5.7 to about 9.
Claim 8
Dependent Claim
16 words
The composition of claim 6 wherein said weight ratio ranges from about 5.7 to about 8.
Claim 9
Dependent Claim
19 words
The composition of claim 6 which contains from about 4 to about 15 wt% of said linear polyethylene polymer.
Claim 10
Dependent Claim
19 words
The composition of claim 8 which contains from about 4 to about 8 wt.% of said linear polyethylene polymer.
Claim 11
Dependent Claim
33 words
The composition of claim 1 wherein the weight ratio of saturates to asphaltenes in said asphalt is at least about 6 but below that at which phase separation of said composition will occur.
Claim 12
Dependent Claim
23 words
The composition of claim 2 wherein the weight ratio of saturates to asphaltenes in said asphalt ranges from about 5.7 to about 9.
Claim 13
Dependent Claim
23 words
The composition of claim 11 wherein the weight ratio of saturates to asphaltenes in said asphalt ranges from about 5.7 to about 8.
Claim 14
Dependent Claim
16 words
The composition of claim 11 wherein the said asphalt comprises a major amount of said composition.
Claim 15
Dependent Claim
71 words
An asphalt paving binder which comprises (a) at least 85 wt.% of an asphalt which has a weight ratio of saturates to asphaltenes ranging from about 5.7 to about 9, and (b) from about 4 to about 15 wt.% of at least one linear polyethylene polymer selected from the group consisting of linear very low density polyethylene polymers, linear low density polyethylene polymers, linear high density polyethylene polymers, and mixtures thereof.
Claim 16
Dependent Claim
71 words
An asphalt paving binder which comprises (a) at least 85 wt.% of an asphalt which has a weight ratio of saturates to asphaltenes ranging from about 5.7 to about 9, and (b) from about 4 to about 15 wt.% of at least one linear polyethylene polymer selected from the group consisting of linear very low density polyethylene polymers, linear low density polyethylene polymers, linear high density polyethylene polymers, and mixtures thereof.
Claim 17
Dependent Claim
22 words
The paving binder of claim 14 wherein from about 4 to about 10 wt.% of said linear polyethylene polymer is present therein.
Claim 18
Dependent Claim
21 words
The paving binder of claim 15 wherein the amount of linear polyethylene compound ranges from about 4 to about 8 wt.%.
Claim 19
Dependent Claim
57 words
The paving binder of claim 14 wherein said linear very low density polyethylene polymers have a melt index of at least about 3 g/10 mins., said linear low density polyethylene polymers have a melt index of above 8 g/10 mins., said linear high density polyethylene polymers have a melt index of at least about 6.7 g/10 mins.
Claim 20
Dependent Claim
24 words
The paving binder of claim 14 wherein the weight ratio of saturates to asphaltenes in said asphalt ranges from about 5.7 to about 8.
Claim 21
Dependent Claim
24 words
The paving binder of claim 16 wherein the weight ratio of saturates to asphaltenes in said asphalt ranges from about 5.7 to about 7.
Claim 22
Dependent Claim
12 words
The paving binder of claim 15 wherein said asphalt comprises vacuum residua.
Claim 23
Dependent Claim
121 words
In a process for improving the creep resistance and storage stability of an asphalt containing saturates and asphaltenes in which a polyethylene polymer is added to said asphalt, the improvement which comprises adding at least 4 wt.% of at least one linear polyethylene polymer to said asphalt provided the weight ratio of said saturates to asphaltenes therein is above about 5.7, to form a polyethylene modified asphalt which has enhanced creep resistance and storage stability relative to that obtained in the absence of adding a linear polyethylene polymer to said asphalt, wherein the weight ratio of the saturates to asphaltenes in said asphalt is above about 5.7 and below that at which phase separation of said polyethylene modified asphalt will occur.
Claim 24
Dependent Claim
121 words
In a process for improving the creep resistance and storage stability of an asphalt containing saturates and asphaltenes in which a polyethylene polymer is added to said asphalt, the improvement which comprises adding at least 4 wt.% of at least one linear polyethylene polymer to said asphalt provided the weight ratio of said saturates to asphaltenes therein is above about 5.7, to form a polyethylene modified asphalt which has enhanced creep resistance and storage stability relative to that obtained in the absence of adding a linear polyethylene polymer to said asphalt, wherein the weight ratio of the saturates to asphaltenes in said asphalt is above about 5.7 and below that at which phase separation of said polyethylene modified asphalt will occur.
Claim 25
Dependent Claim
23 words
The process of claim 21 wherein from about 4 to about 25 wt.% of said linear polyethylene polymer is added to said asphalt.
Claim 26
Dependent Claim
33 words
The process of claim 21 wherein said linear polyethylene polymer is selected from the group consisting of very low density polyethylene polymers, low density polyethylene polymers, high density polyethylene polymers, and mixtures thereof.
Claim 27
Dependent Claim
55 words
The process of claim 23 wherein said linear very low density polyethylene polymers have a melt index of at least about 3 g/10 mins., said linear low density polyethylene polymers have a melt index above 8 g/10 mins., said linear high density polyethylene polymers have a melt index of at least about 6.7 g/10 mins.
Claim 28
Dependent Claim
16 words
The process of claim 21 wherein said weight ratio ranges between about 5.7 and about 9.
Claim 29
Dependent Claim
16 words
The process of claim 25 wherein said weight ratio ranges between about 5.7 and about 8.
Claim 30
Dependent Claim
23 words
The process of claim 25 wherein from about 4 to about 15 wt% of said linear polyethylene polymer is added to said asphalt.
Claim 31
Dependent Claim
23 words
The process of claim 27 wherein from about 4 to about 8 wt.% of said linear polyethylene polymer is added to said asphalt.
Claim 32
Dependent Claim
33 words
The process of claim 21 wherein the weight ratio of saturates to asphaltenes in said asphalt is at least about 6 but below that at which phase separation of said composition will occur.
Claim 33
Dependent Claim
23 words
The process of claim 22 wherein the weight ratio of saturates to asphaltenes in said asphalt ranges from about 5.7 to about 9.
Claim 34
Dependent Claim
18 words
The process of claim 30 wherein the said asphalt comprises a major amount of said polyethylene modified asphalt.
Claim 35
Dependent Claim
11 words
The process of claim 21 wherein said asphalt comprises vacuum residua.
Claim 36
Dependent Claim
23 words
The process of claim 30 wherein the weight ratio of saturates to asphaltenes in said asphalt ranges from about 5.7 to about 8.
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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |