Method of manufacturing fire retardant polystyrene insulating board
USRE33986E · kind E · reissue
0Cited by
10References
5Claims
0Family size
Inventor
Key dates
| Filing date | Mar 28, 1988 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Mar 28, 2008 |
Classification
- Technology area (CPC —)General
Abstract
Fire retardant polystyrene insulating material is manufactured from expandable polystyrene beads in admixture with a phenol-formaldehyde or melamine-for-maldehyde resin in resole form, the resin containing a blowing agent and a surfactant. The insulating material is formed from the bead-resin mix by applying dielectric heating to foam the resin, expand the beads, and cure the foamed resin to a closed cell structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.