Low density, resorcinol-formaldehyde aerogels
US4873218A · kind A · utility
194Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 26, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | May 26, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The polycondensation of resorcinol with formaldehyde under alkaline conditions results in the formation of surface functionalized polymer "clusters". The covalent crosslinking of these "clusters" produces gels which when processed under supercritical conditions, produce low density, organic aerogels (density .ltoreq.100 mg/cc; cell size .ltoreq.0.1 microns). The aerogels are transparent, dark red in color and consist of interconnected colloidal-like particles with diameters of about 100 .ANG.. These aerogels may be further carbonized to form low density carbon foams with cell size of about 0.1 micron.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.