Hydrophilic ester polyurethane foams
US6756416B2 · kind B2 · utility
6Cited by
12References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2002 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Apr 20, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An ester polyurethane foam is prepared by reacting a mixture of one or more polyester polyols with one or more isocyanates and one or more silicone surfactants in the presence of a blowing agent, such as water, and other additives, such as catalysts. The cured foam is chemically treated in a caustic solution to form a hydrophilic ester polyurethane foam having a water absorption rate of at least 20 pounds of water per square foot per minute, preferably at least 25 pounds of water per square foot per minute. The foam also has greater water holding capacity and wet strength than cellulose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.