Epoxy novolac coated ceramic particulate
US4869960A · kind A · utility
58Cited by
21References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1987 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Sep 17, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ceramic particulate useful as a proppant in hydraulic fracturing and in gravel packing operations is provided which comprises a ceramic (sometimes vitreous) core surrounded by an epoxy resin coating. Novolac epoxy resin compounds without any substantial acid soluble filler are used to coat ceramic particulates similar to those disclosed in U.S. Pat. Nos. 4,680,230 and 4,632,876. The result is a product which combines the excellent solvent resistance of the ceramics with the acid resistance of the resin. The resin coating gives the added benefits of lower specific gravity and improved crush resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.