Polyethylene microporous membrane and a process for the production of the same
US4620955A · kind A · utility
26Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1986 |
| Grant date | Nov 4, 1986 |
| Priority date | — |
| Expiry date | Feb 25, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249978
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A polyethylene microporous membrane having a thickness of at most 10 .mu.m, a breaking strength of at least 200 kg/cm.sup.2 and a porosity of at least 30% is produced by heating and dissolving polyethylene having a weight average molecular weight of at least 5.times.10.sup.5 in a solvent, forming a gel sheet from the resulting solution, subjecting the gel sheet to a solvent removal treatment to adjust the amount of the solvent in the gel sheet to 10 to 80% by weight, heating and stretching the sheet and then removing the residual solvent therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.