US5733955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt cement modification
Assignee: Goodyear Tire and Rubber Co
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Filing: 1997-01-13
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Granted: 1998-03-31
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Expires: 2017-01-13
Abstract
Abstract It has been determined that rubbery terpolymers of a conjugated diolefin monomer, a vinyl aromatic monomer, and N-(isobutoxymethyl) acrylamide (IBMA) can be used to modify asphalt cement to greatly enhance the resistance to shoving, rutting, and low temperature cracking of asphalt concretes made therewith. These rubbery polymers have a Mooney viscosity which is within the range of about 35 to about 80. It has further been determined that these rubbery terpolymers are compatible with virtually all types of asphalt. It is particularly preferred for the rubbery polymers of this invention to also contain repeat units which are derived from hydroxypropyl methacrylate (HPMA). The subject invention more specifically relates to a modified asphalt cement which is comprised of (1) from about 90 weight percent to about 99 weight percent of asphalt; and (2) from about 1 weight percent to about 10 weight percent of a rubbery polymer which is comprised of repeat units which are derived from (a) about 64 weight percent to about 84.9 weight percent of a conjugated diolefin monomer, (b) about 15 weight percent to about 33 weight percent of a vinyl aromatic monomer, and (c) about 0.1 weight percent to about 3 weight percent of isobutoxymethyl acrylamide, wherein the repeat units in the rubbery polymer which are derived from the conjugated diolefin monomer, the vinyl aromatic monomer, and the isobutoxymethyl acrylamide are in the backbone of the rubbery polymer.
Inventors
- 👤 Gerald Owen Schulz
- 👤 Daniel Frederick Klemmensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:39
CPC Classifications
C; C08; C08L; C08L95/00; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
157 words
An asphalt concrete which is comprised of (A) from about 90 weight percent to about 99 weight percent of an aggregate, and (B) from about 1 weight percent to about 10 weight percent of a modified asphalt cement which is comprised of (1) from about 90 weight percent to about 99 weight percent of asphalt; and (2) from about 1 weight percent to about 10 weight percent of a rubbery polymer which is comprised of repeat units which are derived from (a) about 64 weight percent to about 84.9 weight percent of a conjugated diolefin monomer, (b) about 15 weight percent to about 33 weight percent of a vinyl aromatic monomer, and (c) about 0.1 weight percent to about 3 weight percent of isobutoxymethyl acrylamide, wherein the repeat units in the rubbery polymer which are derived from the conjugated diolefin monomer, the vinyl aromatic monomer, and the isobutoxymethyl acrylamide are in the backbone of the rubbery polymer.
Claim 2
Dependent Claim
157 words
An asphalt concrete which is comprised of (A) from about 90 weight percent to about 99 weight percent of an aggregate, and (B) from about 1 weight percent to about 10 weight percent of a modified asphalt cement which is comprised of (1) from about 90 weight percent to about 99 weight percent of asphalt; and (2) from about 1 weight percent to about 10 weight percent of a rubbery polymer which is comprised of repeat units which are derived from (a) about 64 weight percent to about 84.9 weight percent of a conjugated diolefin monomer, (b) about 15 weight percent to about 33 weight percent of a vinyl aromatic monomer, and (c) about 0.1 weight percent to about 3 weight percent of isobutoxymethyl acrylamide, wherein the repeat units in the rubbery polymer which are derived from the conjugated diolefin monomer, the vinyl aromatic monomer, and the isobutoxymethyl acrylamide are in the backbone of the rubbery polymer.
Claim 3
Dependent Claim
155 words
A modified asphalt cement which is comprised of (1) from about 90 weight percent to about 99 weight percent of asphalt; and (2) from about 1 weight percent to about 10 weight percent of a rubbery polymer which is comprised of repeat units which are derived from (a) about 64 weight percent to about 84.9 weight percent of a conjugated diolefin monomer, (b) about 15 weight percent to about 33 weight percent of a vinyl aromatic monomer, and (c) about 0.1 weight percent to about 3 weight percent of isobutoxymethyl acrylamide, wherein the repeat units in the rubbery polymer which are derived from the conjugated diolefin monomer, the vinyl aromatic monomer, and the isobutoxymethyl acrylamide are in the backbone of the rubbery polymer, wherein the repeat units in the rubbery polymer which are derived from the conjugated diolefin monomer, the vinyl aromatic monomer, and the isobutoxymethyl acrylamide are in the backbone of the rubbery polymer.
Claim 4
Dependent Claim
155 words
A modified asphalt cement which is comprised of (1) from about 90 weight percent to about 99 weight percent of asphalt; and (2) from about 1 weight percent to about 10 weight percent of a rubbery polymer which is comprised of repeat units which are derived from (a) about 64 weight percent to about 84.9 weight percent of a conjugated diolefin monomer, (b) about 15 weight percent to about 33 weight percent of a vinyl aromatic monomer, and (c) about 0.1 weight percent to about 3 weight percent of isobutoxymethyl acrylamide, wherein the repeat units in the rubbery polymer which are derived from the conjugated diolefin monomer, the vinyl aromatic monomer, and the isobutoxymethyl acrylamide are in the backbone of the rubbery polymer, wherein the repeat units in the rubbery polymer which are derived from the conjugated diolefin monomer, the vinyl aromatic monomer, and the isobutoxymethyl acrylamide are in the backbone of the rubbery polymer.
Claim 5
Dependent Claim
27 words
An asphalt concrete as specified in claim 1 wherein the rubbery polymer has a Mooney viscosity which is within the range of about 35 to about 80.
Claim 6
Dependent Claim
64 words
An asphalt concrete as specified in claim 3 wherein the rubbery polymer is comprised of repeat units which are derived from about 72.5 weight percent to about 81.8 weight percent of the conjugated diolefin monomer, from about 18 weight percent to about 26 weight percent of the vinyl aromatic monomer, and from about 0.2 weight percent to 1.5 weight percent of the N-(isobutoxymethyl) acrylamide.
Claim 7
Dependent Claim
15 words
An asphalt concrete as specified in claim 4 wherein the vinyl aromatic monomer is styrene.
Claim 8
Dependent Claim
15 words
An asphalt concrete as specified in claim 5 wherein the conjugated diolefin monomer is 1,3-butadiene.
Claim 9
Dependent Claim
46 words
An asphalt concrete as specified in claim 6 wherein the modified asphalt cement is comprised of (1) from about 94 weight percent to about 99 weight percent of the asphalt and (2) from about 1 weight percent to about 6 weight percent of the rubbery polymer.
Claim 10
Dependent Claim
46 words
An asphalt concrete as specified in claim 7 wherein said asphalt concrete is comprised of (A) from about 94 weight percent to about 98 weight percent of the aggregate, and (B) from about 2 weight percent to about 6 weight percent of the modified asphalt cement.
Claim 11
Dependent Claim
27 words
An asphalt concrete as specified in claim 8 wherein the rubbery polymer has a Mooney viscosity which is within the range of about 40 to about 70.
Claim 12
Dependent Claim
62 words
An asphalt concrete as specified in claim 9 wherein the rubbery polymer is comprised of repeat units which are derived from about 72.5 weight percent to about 81.8 weight percent of the 1,3-butadiene monomer, from about 18 weight percent to about 26 weight percent of the styrene monomer, and from about 0.2 weight percent to 1.5 weight percent of the N-(isobutoxymethyl) acrylamide.
Claim 13
Dependent Claim
46 words
An asphalt concrete as specified in claim 10 wherein the modified asphalt cement is comprised of (1) from about 96 weight percent to about 98 weight percent of the asphalt and (2) from about 2 weight percent to about 4 weight percent of the rubbery polymer.
Claim 14
Dependent Claim
46 words
An asphalt concrete as specified in claim 11 wherein said asphalt concrete is comprised of (A) from about 92 weight percent to about 97 weight percent of the aggregate, and (B) from about 3 weight percent to about 8 weight percent of the modified asphalt cement.
Claim 15
Dependent Claim
27 words
An asphalt concrete as specified in claim 12 wherein the rubbery polymer has a Mooney viscosity which is within the range of about 50 to about 60.
Claim 16
Dependent Claim
44 words
An asphalt concrete as specified in claim 6 wherein the rubbery polymer is further comprised of repeat units which are derived from hydroxypropyl methacrylate, and wherein the repeat units which are derived from the hydroxypropyl methacrylate are in the backbone of the rubbery polymer.
Claim 17
Dependent Claim
28 words
An asphalt concrete as specified in claim 14 wherein the weight ratio of hydroxypropyl methacrylate to N-(isobutoxymethyl) acrylamide is within the range of about 0.5:1 to about 4:1.
Claim 18
Dependent Claim
28 words
An asphalt concrete as specified in claim 14 wherein the weight ratio of hydroxypropyl methacrylate to N-(isobutoxymethyl) acrylamide is within the range of about 1:1 to about 3:1.
Claim 19
Dependent Claim
28 words
An asphalt concrete as specified in claim 14 wherein the weight ratio of hydroxypropyl methacrylate to N-(isobutoxymethyl) acrylamide is within the range of about 5:4 to about 7:4.
Claim 20
Dependent Claim
13 words
A pavement which is made utilizing the asphalt concrete specified in claim 1.
Claim 21
Dependent Claim
73 words
An asphalt concrete as specified in claim 14 wherein the rubbery polymer is comprised of repeat units which are derived from about 71 weight percent to about 81.5 weight percent of the conjugated diolefin monomer, from about 18 weight percent to about 26 weight percent of vinyl aromatic monomers, from about 0.3 weight percent to 1.0 weight percent isobutoxymethyl acrylamide, and from about 0.2 weight percent to about 2 weight percent hydroxypropyl methacrylate.
Claim 22
Dependent Claim
73 words
An asphalt concrete as specified in claim 14 wherein the rubbery polymer is comprised of repeat units which are derived from about 71.7 weight percent to about 81 weight percent of the conjugated diolefin monomer, from about 18 weight percent to about 26 weight percent of vinyl aromatic monomers, from about 0.4 weight percent to 0.8 weight percent isobutoxymethyl acrylamide, and from about 0.6 weight percent to about 1.5 weight percent hydroxypropyl methacrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |