US4068023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubberized asphalt paving composition and use thereof
Assignee: Union Oil Company of California
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Filing: 1976-05-20
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Granted: 1978-01-10
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Expires: 1996-05-20
Abstract
Abstract The dissolving and/or dispersing of relatively large proportions of reclaimed rubber into molten paving asphalts is facilitated by incorporating into the asphalt a minor proportion of a highly aromatic, high-boiling, high-flash-point mineral oil. The resulting mixtures can be held at temperatures above 300° F for substantial periods of time without becoming too viscous for convenient handling, thereby facilitating the application thereof to roadways. The rubberized asphalt mixtures are particularly useful in the form of stress absorbing membrane interlayers between old, damaged pavement surfaces and an overlayer of new asphalt concrete, for providing chip-seal coatings over old pavement, as crack fillers in Portland Cement concrete or asphalt concrete pavements, and bridge deck waterproofing membranes.
Inventors
- 👤 Donald L. Nielsen
- 👤 James R. Bagley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:54
CPC Classifications
C; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A paving composition comprising a heat-blended, substantially homogeneous composite of (1) from about 50-89 weight-percent of an asphaltic component selected from the class consisting of paving grade asphalts, slow curing liquid asphalts and road oils, (2) between about 10% and 30% by weight of a reclaimed rubber component, about 10-60 weight-percent of said reclaimed rubber component being ground vulcanized natural rubber, and about 15-70 weight-percent thereof being ground devulcanized rubber, and (3) between about 1% and 20% by weight of a mineral oil solvent having a flash point above about 300° F, and containing more than about 50 weight-percent aromatics, at least about 50% of said solvent boiling above 700° F, and at least about 90% thereof boiling above 600° F.
Claim 2
Dependent Claim
19 words
A composition as defined in claim 1 wherein said mineral oil solvent contains at least about 60 weight-percent aromatics.
Claim 3
Dependent Claim
20 words
A composition as defined in claim 1 wherein said mineral oil solvent has a flash point above about 350° F.
Claim 4
Dependent Claim
27 words
A composition as defined in claim 1 wherein said mineral oil solvent contains at least about 60 weight-percent aromatics and less than about 20 weight-percent saturated hydrocarbons.
Claim 5
Dependent Claim
20 words
A composition as defined in claim 4 wherein said mineral oil solvent has a flash point above about 350° F.
Claim 6
Independent Claim
158 words
A method for the manufacture of a paving composition which comprises: 1. blending about 50-89 weight-percent, based on the final composition, of an asphaltic component selected from the class consisting of molten paving grade asphalts, slow curing liquid asphalts and road oils, with about 1-20 weight-percent of a mineral oil solvent having a flash point above about 350° F, and containing more than about 50 weight-percent aromatics, at least about 50% of said solvent boiling above 700° F, and at least about 90% thereof boiling above 600° F; 2. adding to the blend from step (1) about 10-30% by weight, based on the final composition, of a granulated reclaimed rubber component, about 10-60 weight-percent of said reclaimed rubber component being vulcanized natural rubber, and about 15-70 weight-percent thereof being devulcanized rubber; and 3. heating and agitating the resulting mixture at a temperature between about 300° and 500° F for a time sufficient to produce a substantially homogeneous composite.
Claim 7
Dependent Claim
20 words
A method as defined in claim 6 wherein said heating in step (3) is carried out at about 350°-450° F.
Claim 8
Dependent Claim
27 words
A method as defined in claim 6 wherein said mineral oil solvent contains at least about 60 weight-percent aromatics and less than about 20 weight-percent saturated hydrocarbons.
Claim 9
Dependent Claim
56 words
A method for applying a rubberized asphalt membrane to a roadway which comprises preparing a paving composition by the method of claim 6, and thereafter spraying the resulting composition onto the untreated prepared roadway at a temperature between about 325° and 450° F, to provide an adherent membrane of about 1/16 - 3/16 inch in thickness.
Claim 10
Dependent Claim
26 words
A method as defined in claim 9 wherein said spraying is carried out at least about 2 hours after the formation of said substantially homogeneous composite.
Claim 11
Dependent Claim
24 words
A method as defined in claim 9 wherein rock chips or other mineral cover materials are subsequently applied to the surface of said membrane.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |