Syntactic rigid PUR/PIR foam boardstock
US6166109A · kind A · utility
38Cited by
10References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1998 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Sep 23, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to the use of hollow microspheres filled with a hydrocarbon, to introduce uniform cell geometries in syntactic foams having a bimodal cell structure. The rigid foam product includes from 20 to 80 percent by weight of the hollow microspheres, the microspheres having average diameters ranging from 80 to 200 microns. The microspheres are encapsulated from 80 to 20 percent by weight of a closed cell polyurethane foam, the cells of the foam having average diameters from 0.01 to 60 microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.