Membranes of polyurethane based materials including polyester polyols
US6321465A · kind A · utility
346Cited by
74References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Nov 9, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31551
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to membranes including an urethane including a polyester polyol, wherein the membrane has a gas transmission rate of 15.0 or less for nitrogen gas wherein the membrane has an average thickness of approximately 20.0 mils. Under certain embodiments, the membranes include blends of one or more polyester polyol based thermoplastic urethanes and one or more barrier materials. The membranes can be employed in a variety of applications and can be used as either monolayers or multi-layered laminates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.