Membranes of polyurethane based materials including polyester polyols
US6692803B2 · kind B2 · utility
7Cited by
9References
38Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 27, 2001 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Sep 27, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31931
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.