Method of producing roofing shingle coating asphalt from non-coating grade asphalt
US7951239B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2007 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Feb 27, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D195/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of producing a roofing shingle coating asphalt from a non-coating grade asphalt feedstock includes the following steps. The non-coating grade asphalt feedstock is partially blown to lower its penetration to a first penetration that is within or close to a target penetration range of the coating asphalt, and to raise its softening point to a first softening point that is lower than a target softening point range of the coating asphalt. Then a wax is added to the partially blown non-coating grade asphalt to further raise its softening point to a second softening point that is within the target softening point range to produce the coating asphalt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.