Method for making a pitch-based foam
US6315974A · kind A · utility
10Cited by
20References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1998 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Jul 10, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D69/023
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A mesophase pitch material having a melting point in excess of 350.degree. C. has a solvent added thereto to provide a solvated mesophase pitch. A low molecular weight solvent is used so that the melting point can be brought low enough to create a carbon foam at a convenient temperature. The solvent is then removed by heat and/or vacuum and, consequently, the pitch reverts to a high melting point of approximately greater than 350.degree. C. The pitch can then be heated or carbonized without an oxidative stabilization step. Alternatively, a solvated mesophase pitch material may be used initially for foaming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.