Method for producing air-permeable composite sheet
US9221021B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 2014 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Oct 27, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249991
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
It is an objective of the present invention to provide a method for producing an air-permeable composite sheet which has excellent mechanical strength and compression resistance as well as PTFE's innate property such as air-permeability, water repellency, heat resistance and chemical resistance; and a filter and a fabrics material containing the air-permeable composite sheet produced by the method as a constituent material. The method for producing an air-permeable composite sheet according to the present invention is characterized in comprising steps of filling pores of a porous PTFE sheet with a hardenable material solution; hardening or semi-hardening the porous PTFE sheet filled with the hardenable material solution; and expanding the hardened or semi-hardened porous PTFE sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.