Phosphorus loaded particles and methods for their preparation and use
US8288455B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 2011 |
| Grant date | Oct 16, 2012 |
| Priority date | — |
| Expiry date | Dec 6, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K3/016
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A flame retardant additive includes red phosphorus adsorbed into a porous carrier. The carrier may be mixed with white phosphorus above its melting point (41° C.), so that liquid phosphorus is pulled into the pores of the carrier by capillary action. The phosphorus-loaded carrier may be heated above 250° C. to convert the white phosphorus to red phosphorus. The resulting red phosphorus-loaded carrier may retain flame retardant activity, and may also be protected from the environment for easier handling and formulation. By employing a carrier of a suitably small particle size, it is practical to incorporate the flame retardant red phosphorus-loaded carrier in thin films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.