Open celled foam and method of making an open celled foam
US5770636A · kind A · utility
6Cited by
2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1997 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Aug 20, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2205/05
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A lightweight open celled foam, having a density no greater than 6 pounds per cubic foot (pcf) and a ratio of imide to amide groups greater than 1 to 1 and no greater than 19 to 1, is the reaction product made from an organic polyisocyanate having at least two functional groups per molecule and a mixture of a difunctional acid and a difunctional anhydride in the presence of a tertiary amine catalyst and a nonionic, organic surfactant having a hydrophilic/lipophilic balance (HLB) of at least 12, with the reactants generating carbon dioxide during the manufacturing process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.