Polymer-modified, vulcanized asphalt composition and its method of preparation
US7241821B1 · kind B1 · utility
6Cited by
17References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2004 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Sep 18, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L53/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is provided for improving high temperature performance grade properties of polymer-modified, vulcanized asphalt by treating an asphalt cement under mild oxidizing conditions sufficient to provide a change in viscosity per hour as measured at 140° C. of less than about 500 poises per hour, of said asphalt cement, adding 1 wt. % to 10 wt. % of a polymer based on weight of said asphalt cement, and vulcanizing the polymer-containing asphalt cement. 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.