Flame retardant filler
US8900491B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2011 |
| Grant date | Dec 2, 2014 |
| Priority date | — |
| Expiry date | Mar 21, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/0209
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A flame retardant filler having brominated silica particles, for example, imparts flame retardancy to manufactured articles such as printed circuit boards (PCBs), connectors, and other articles of manufacture that employ thermosetting plastics or thermoplastics. In this example, brominated silica particles serve both as a filler for rheology control (viscosity, flow, etc.) and a flame retardant. In an exemplary application, a PCB laminate stack-up includes conductive planes separated from each other by a dielectric material that includes a flame retardant filler comprised of brominated silica particles. In an exemplary method of synthesizing the brominated silica particles, a monomer having a brominated aromatic functional group is reacted with functionalized silica particles (e.g., isocyanate, vinyl, amine, or epoxy functionalized silica particles). Alternatively, a monomer having a brominated aromatic functional group may be reacted with a silane to produce a brominated alkoxysilane monomer, which is then reacted with the surface of silica particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.