Composite polyurethane foams and method of manufacture thereof
US6635688B2 · kind B2 · utility
53Cited by
42References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2001 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Jul 8, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31554
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Integrally bonded composite polyurethane foams substantially free from coalescence and with no discernable bond or structural interface layer when viewed at 50× magnification can be formed by wet casting a second foamed polyurethane composition onto a first wet cast foamed polyurethane composition and simultaneously curing the cast foams. In a preferred embodiment, one curable polyurethane composition forms a slow recovery foam and the other curable polyurethane composition forms a resilient foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.