Polyurethane foam composition and method of manufacture thereof
US6803495B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2001 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Aug 24, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2110/0066
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An open-celled polyurethane foam formed from a composition comprising an active hydrogen-containing component, an organic polyisocyanate component having an average isocyanate functionality of 2.00 to 2.25, a surfactant component, and a catalyst. The foam has a thickness of about 6 to about 20 mils; a density of about 10 to about 50 pcf; an average cell diameter of about 25 to about 80 microns; and cell openings having an average diameter of about 1 to about 25 microns, wherein the ratio of average cell diameter to average cell opening diameter is about 3 to about 10; a water vapor transmission rate of greater than about 1000 grams per square meter per day, and which do not leak water or similar fluids. Such foams find particular utility as backings for bandages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.