Asymmetric porous polytetrafluoroethylene membrane for clothing
US7309663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2004 |
| Grant date | Dec 18, 2007 |
| Priority date | — |
| Expiry date | May 21, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/678
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides an asymmetric porous PTFE membrane for clothing having little change over time and conventionally known properties of a porous PTFE molded article such as water permeability resistance, air permeability, sealing properties and electric properties, in which durability and water vapor permeability are improved by strengthening adhesion strength with fabric. Specifically, the present invention relates to an asymmetric porous PTFE membrane for clothing comprising a dense skin layer and a continuously foamed porous layer, wherein(1) the contact angle of water to the surface of the skin layer is 120 to 140°; and(2) the diffuse reflectance of light of the skin layer is 91 to 94%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.