Method of producing of microporous polyolefin membrane
US5830554A · kind A · utility
28Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1996 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Sep 24, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/269
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An efficient method of producing a microporous polyolefin membrane having improved tensile strength and pierce strength is provided, in which a solution having dissolved therein 5% by weight to 50% by weight of a polyolefin whose weight-average molecular weight is in the range of 5.times.10.sup.5 to 2.5.times.10.sup.6 and whose weight-average molecular weight to number-average molecular weight ratio is less than 10, is extruded and rapidly cooled to obtain a gel-like product which is then stretched and has remaining solvent removed therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.