US5262240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aggregate treatment
Assignee: Goodyear Tire and Rubber Co
•
Filing: 1992-07-06
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Granted: 1993-11-16
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Expires: 2012-07-06
Abstract
Abstract The subject invention relates to a process for coating aggregate which is particularly useful in making asphalt concrete to provide the aggregate with a high level of resistance to stripping by water, which comprises: (1) mixing the aggregate with latex to form a latex/aggregate mixture which is comprised of from about 0.005 weight percent to about 0.5 weight percent dry polymer; (2) heating the latex/aggregate mixture to a temperature which is within the range of about 66° C. to about 232° C.; (3) maintaining the latex/aggregate mixture at said elevated temperature for a time which is sufficient to reduce the moisture content of the latex/aggregate mixture below about 0.7 weight percent and to allow the polymer in the latex to crosslink on the surface of the aggregate to produce the coated aggregate.
Inventors
- 👤 Robert L. Dunning
- 👤 Gerald O. Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:21
CPC Classifications
C; C08; C08L; C08L95/00; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B26/00; C04B26/02; C04B26/26; C04B2111/00; C04B2111/00474; C04B2111/0075; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
128 words
A process for coating aggregate which is particularly useful in making asphalt concrete to provide the aggregate with a high level of resistance to stripping by water, which comprises: (1) mixing the aggregate with latex to form a latex/aggregate mixture which is comprised of from about 0.005 weight percent to about 0.5 weight percent dry polymer; (2) heating the latex/aggregate mixture to a temperature which is within the range of about 66° C. to about 232° C.; and (3) maintaining the latex/aggregate mixture at said elevated temperature for a time which is sufficient to reduce the moisture content of the latex/aggregate mixture below about 0.7 weight percent and to allow the polymer in the latex to crosslink on the surface of the aggregate to produce the coated aggregate.
Claim 2
Dependent Claim
128 words
A process for coating aggregate which is particularly useful in making asphalt concrete to provide the aggregate with a high level of resistance to stripping by water, which comprises: (1) mixing the aggregate with latex to form a latex/aggregate mixture which is comprised of from about 0.005 weight percent to about 0.5 weight percent dry polymer; (2) heating the latex/aggregate mixture to a temperature which is within the range of about 66° C. to about 232° C.; and (3) maintaining the latex/aggregate mixture at said elevated temperature for a time which is sufficient to reduce the moisture content of the latex/aggregate mixture below about 0.7 weight percent and to allow the polymer in the latex to crosslink on the surface of the aggregate to produce the coated aggregate.
Claim 3
Dependent Claim
14 words
A process as specified in claim 1 wherein the latex contains a sulfonate surfactant.
Claim 4
Dependent Claim
15 words
A process as specified in claim 1 wherein the latex is a polydiene rubber latex.
Claim 5
Dependent Claim
15 words
A process as specified in claim 1 wherein the latex is a styrene-butadiene rubber latex.
Claim 6
Dependent Claim
15 words
A process as specified in claim 1 wherein the latex is a polybutadiene rubber latex.
Claim 7
Dependent Claim
28 words
A process as specified in claim 3 wherein the latex/aggregate mixture prepared in step (1) contains from about 0.01 weight percent to about 0.2 weight percent dry polymer.
Claim 8
Dependent Claim
29 words
A process as specified in claim 6 wherein the latex has a solids content which is within the range of about 2 weight percent to about 45 weight percent.
Claim 9
Dependent Claim
29 words
A process as specified in claim 7 wherein the latex/aggregate mixture is heated to a temperature which is within the range of about 93° C. to about 204° C.
Claim 10
Dependent Claim
28 words
A process as specified in claim 5 wherein the latex/aggregate mixture prepared in step (1) contains from about 0.05 weight percent to about 0.1 weight percent dry polymer.
Claim 11
Dependent Claim
29 words
A process as specified in claim 9 wherein the latex has a solids content which is within the range of about 5 weight percent to about 30 weight percent.
Claim 12
Dependent Claim
29 words
A process as specified in claim 10 wherein the latex/aggregate mixture is heated to a temperature which is within the range of about 149° C. to about 177° C.
Claim 13
Dependent Claim
29 words
A process as specified in claim 11 wherein the latex has a solids content which is within the range of about 10 weight percent to about 20 weight percent.
Claim 14
Dependent Claim
20 words
A process as specified in claim 2 wherein the latex/aggregate mixture is heated in step (2) in a drum mixer.
Claim 15
Dependent Claim
14 words
A process as specified in claim 5 wherein the latex contains a di-sulfonated surfactant.
Claim 16
Dependent Claim
11 words
The coated aggregate made by the process specified in claim 1.
Claim 17
Dependent Claim
24 words
The coated aggregate specified in claim 15 wherein the aggregate is coated with from about 0.05 weight percent to about 0.1 weight percent polybutadiene.
Claim 18
Dependent Claim
153 words
A process for preparing asphalt concrete which comprises: (1) mixing an aggregate with latex to form a latex/aggregate mixture which is comprised of about 0.005 weight percent to about 0.5 weight percent dry polymer; (2) heating the latex/aggregate mixture to a temperature which is within the range of about 66° C. to about 232° C.; (3) maintaining the latex/aggregate mixture at said elevated temperature for a time which is sufficient to reduce the moisture content of the latex/aggregate mixture below about 0.7 weight percent and to allow the polymer in the latex to crosslink on the surface of the aggregate to produce the coated aggregate; (4) mixing the coated aggregate with about 3% to about 8% asphalt based upon the total weight of the coated aggregate at a temperature of at least about 107° C.; and (5) continuing to mix the coated aggregate with the asphalt to attain an essentially homogeneous asphalt concrete.
Claim 19
Dependent Claim
153 words
A process for preparing asphalt concrete which comprises: (1) mixing an aggregate with latex to form a latex/aggregate mixture which is comprised of about 0.005 weight percent to about 0.5 weight percent dry polymer; (2) heating the latex/aggregate mixture to a temperature which is within the range of about 66° C. to about 232° C.; (3) maintaining the latex/aggregate mixture at said elevated temperature for a time which is sufficient to reduce the moisture content of the latex/aggregate mixture below about 0.7 weight percent and to allow the polymer in the latex to crosslink on the surface of the aggregate to produce the coated aggregate; (4) mixing the coated aggregate with about 3% to about 8% asphalt based upon the total weight of the coated aggregate at a temperature of at least about 107° C.; and (5) continuing to mix the coated aggregate with the asphalt to attain an essentially homogeneous asphalt concrete.
Claim 20
Dependent Claim
35 words
A process as specified in claim 17 wherein the coated aggregate is mixed with about 5 weight percent to about 6 weight percent of the asphalt, based upon the total weight of the coated aggregate.
Claim 21
Dependent Claim
11 words
The asphalt concrete made by the process specified in claim 7.
Claim 22
Dependent Claim
13 words
The pavement which is made utilizing the asphalt concrete specified in claim 19.
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) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |