Microporous polyolefin membranes from bespoke solvents
US12172137B2 · kind B2 · utility
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21Claims
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Key dates
| Filing date | Jan 9, 2024 |
| Grant date | Dec 24, 2024 |
| Priority date | — |
| Expiry date | Jan 9, 2044 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Halogen-free, microporous polyolefin membranes are disclosed herein. The halogen-free, microporous polyolefin membranes can be manufactured using an environmentally friendly manufacturing process that includes extrusion of polymer-plasticizer mixtures followed by sheet formation and extraction of the plasticizer with a halogen-free solvent. The halogen-free solvent has a flashpoint greater than about 23° C. and an initial boiling point at least about 50° C. lower than the flashpoint of the plasticizer. The process can further be a closed loop process in which the halogen-free solvent can be reused.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.