Felted hydrophilic ester polyurethane foams
US6841586B2 · kind B2 · utility
6Cited by
13References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2003 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Dec 23, 2023 |
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 and is then felted (compressed under heat and pressure) to form a hydrophilic ester polyurethane foam having a water absorption rate of at least 30 pounds of water per square foot per minute (1.44 kPa/min). The foam also has greater water holding capacity and wet strength than cellulose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.