High crystalline polypropylene microporous membrane, multi-component microporous membrane and methods for preparing the same
US6830849B2 · kind B2 · utility
15Cited by
12References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2001 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Sep 17, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249958
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a high crystalline polypropylene microporous membrane and a preparation method of the same, and it provides a preparation method of a polypropylene microporous membrane comprising the steps of preparing a precursor film using high crystalline polypropylene having a crystallinity of 50% or more and a very high isotacticity, annealing, stretching at a low temperature, stretching at a high temperature, and heat setting, and a polypropylene microporous membrane having superior permeability and mechanical properties prepared by the preparation method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.