Impregnating polystyrene beads with an expanding agent
US4560705A · kind A · utility
4Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 2, 1985 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | May 2, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2325/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of impregnating polystyrene beads with an aliphatic hydrocarbon, rendering it into expandable polystyrene. The method involves the use of an improved impregnating solution or bath. The solution includes water, an expanding agent, the polystyrene beads and soaps which act as anti-agglomeration agents. The beads are maintained in the solution for a selected time period and at a temperature and pressure suitable to permit the expanding agent to impregnate the beads. The beads are then separated from the solution and, after drying, they are ready for use, no further processing being required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.