Method of incorporating brominated compounds as additives to expanded polystyrene molded patterns for use in lost foam aluminum casting
US7059382B2 · kind B2 · utility
0Cited by
3References
15Claims
0Family size
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Inventor
Key dates
| Filing date | Aug 21, 2003 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Jul 1, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process including topically applying a finely divided powder onto a plurality of polystyrene beads. The finely divided powder includes brominated compounds including a brominated alkane having at least one substituent aromatic group. The polystyrene beads are pre-expanded with the topically applied brominated compounds and a molded pattern is formed from the pre-expanded polystyrene beads. A lost foam casting mold is formed with the molded pattern. Molten metal is poured into the lost foam casting mold and onto the molded pattern to depolymerize the polystyrene beads with the topically applied brominated compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.