Method for preparing an improved bitumen by addition of polyphosphoric acid and a cross-linkable polymer
US7985787B2 · kind B2 · utility
Inventor
Key dates
| Filing date | May 31, 2007 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | Nov 9, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L101/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Methods are provided for preparing a bitumen product having improved properties for use in asphalt road paving. In a preferred embodiment, polyphosphoric acid is added to heated bitumen and stirred for a period of time. After addition of the polyphosphoric acid, one or more sulfur-crosslinkable elastomers and one or more sulfur donor coupling agents is added to the heated bitumen and mixed. The polyphosphoric acid, sulfur-crosslinkable elastomers and sulfur donor coupling agents may also be added to separate quantities of bitumen, and the bitumens may be combined prior to use to obtain a final bitumen product having the desired characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.