Densifiable and re-expandable polyurethane foam
US5032622A · kind A · utility
44Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1990 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Jul 2, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/918
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyurethane foams having a specified glass transition temperature are densified for transportation or other purposes by heating the foam to a temperature above its T.sub.g, compressing the heated foam, and then cooling the compressed foam to a temperature below its T.sub.g. The cooled foam remains in a densified state until re-heated to a temperature above its T.sub.g, whereupon it re-expands to assume its original dimensions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.