Manufacture of polymer coated proppants
US9562187B2 · kind B2 · utility
3Cited by
144References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 23, 2012 |
| Grant date | Feb 7, 2017 |
| Priority date | — |
| Expiry date | May 2, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/805
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Solid proppants are coated in a process that includes the steps of: (a) coating free-flowing proppant solids with a first component of either a polyol or an isocyanate in mixer; (b) adding a second component of either an isocyanate or a polyol that is different from the first component at a controlled rate or volume sufficient to form a polyurethane coating on the proppant solids; and (c) adding water at a rate and volume sufficient to retain the free-flowing characteristics of the proppant solids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.