Porous polytetrafluoro-ethylene and preparation
AssigneeE. I. Du Pont de Nemours and Company
InventorsEdward George Howard, Jr., Arthur Zenker Moss
Life of this patent
Estimating the term…
Abstract
This invention relates to porous polyfluoroethylene (PTFE), shaped articles prepared therefrom, and to methods of preparing said articles.
Claims9
A laminated structure comprising (i) a porous shrink-resistant polytetrafluoro-ethylene (PTFE) shaped article having a mean pore size of less than about 10 .mu.m, a porosity of at least 40%, a DSC melting endotherm in the range of 315 to 333.degree. C. with an associated heat of fusion of at least 35 J/g, and having no DSC melting endotherm at temperatures above 370.degree. C., and (ii) a second, different shaped article bonded to (i).
A filtration medium comprising a porous, shrink-resistant polytetrafluoro-ethylene (PTFE) shaped article having a mean pore size of less than about 10 .mu.m, a porosity of at least 40%, a DSC melting endotherm in the range of 315 to 333.degree. C. with an associated heat of fusion of at least 35 J/g, and having no DSC melting endotherm at temperatures above 370.degree. C.
A gas/liquid separatory medium comprising a porous, shrink-resistant polvtetrafluoro-ethylene (PTFE) shaped article having a mean pore size of less than about 10 .mu.m, a porosity of at least 40%, a DSC melting endotherm in the range of 315 to 333.degree. C., with an associated heat of fusion of at least 35 J/g, and having no DSC melting endotherm at temperatures above 370.degree. C.
Dependencies are inferred from the claim text.