Open celled polyurethane foams
US4826882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1988 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Apr 15, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2340/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Improved, flexible, open celled polyurethane foams are described. The foams are formed in situ from the reaction of a polyisocyanate, a conventional polyester polyol, a polyether polyol, a high hydroxyl polyester polyol and a blowing agent in the presence of a catalyst. A polyether foam stabilizer is normally also included. A small amount of a destabilizing silicone ingredient can also be included. Useful high hydroxyl number polyester polyols have hydroxyl numbers in the range 300-600, and preferably 400-450. The average equivalent weight of the useful high hydroxyl number polyester polyol is normally in the range 100-200. The compositions of the invention are useful as filter media and are especially suitable for outdoor seating applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.