Crosslinkable polymer-modified asphalt and its method of preparation
US6057390A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 15, 1999 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Jun 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L95/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is provided for improving high temperature performance grade properties of asphalt which comprises i) heating an asphalt cement to 200 to 500.degree. F. (93 to 260.degree. C.), ii) adding 1 to 10 wt. % crosslinkable polymer, e.g., styrene-butadiene-styrene triblock copolymer based on weight of said asphalt cement, iii) adding a useful temperature index (UTI) improving amount of dioxime(s) of 1,4-benzoquinone and its derivatives and optionally, free radical initiator, e.g., organic peroxide, and iv) mixing the resulting blend, thereby providing a paving asphalt having a greater useful temperature index (UTI) than a corresponding blend to which no dioxime is added. The invention further relates to asphalt compositions thus made and paving compositions containing these asphalt compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.