Impregnation pitch with improved filterability and process for its manufacture
US4997542A · kind A · utility
3Cited by
8References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1988 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Mar 18, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10C1/19
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An impregnation pitch having a Kraemer-Sarnow softening point ranging from about 60.degree. C. to 80.degree. C., a content of quinoline-insoluble substances less than or equal to 7% by weight, and a filterability index greater than or equal to 4.5. A process for the manufacture thereof, wherein a tar or a pitch having a Kraemer-Sarnow softening point not exceeding 60.degree. C. and a content of quinoline-insoluble substances below or equal to 7% by weight is subjected to a thermal treatment capable of removing constituents with a molecular mass of below 1,200.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.