Surfactant treated polyolefinic microporous materials capable of multiple re-wetting with aqueous solutions
US4501793A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1983 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | Jun 17, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2935
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed are hydrophilic polyolefinic microporous materials and a method for the preparation thereof. Such materials are prepared by impregnating a normally hydrophobic polyolefinic microporous substrate material with a solution of a nonionic alkylphenoxy poly(ethyleneoxy) ethanol surfactant having an HLB of from about 10 to 15 in a solvent system comprising from about 55 to about 65 volume percent methanol or acetone and from about 35 to about 45 volume percent water. It has been discovered that polyolefinic microporous materials rendered hydrophilic by this technique not only wet rapidly, but in addition may be multiply re-wet with aqueous solutions, such as aqueous alkali solutions, with excellent retention of their hydrophilic properties. The hydrophilic polyolefinic microporous materials of this invention find particular application as battery separators and as membranes for use in various chemical, medical and biotechnical processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.