Flame retardant polyurethane foams containing biuret linkages
US9034936B2 · kind B2 · utility
1Cited by
10References
5Claims
0Family size
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Key dates
| Filing date | Dec 16, 2010 |
| Grant date | May 19, 2015 |
| Priority date | — |
| Expiry date | Jan 17, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2110/0083
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyurethane foams are made using a biuret-modified MDI and/or PMDI as the isocyanate component. The isocyanate is characterized by having a high content of biuret-containing oligomers and, preferably, a low proportion (if any) of biuret-urea oligomers. Flexible, resilient foams made using this biuret-modified isocyanate perform well on flammability tests such as the UNI 9175 CS. E. RF4 test, even without added flame retardants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.