Method for varying the transport properties of a film cast from a sulfonated copolymer
US8084546B2 · kind B2 · utility
9Cited by
49References
4Claims
0Family size
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Key dates
| Filing date | Jul 1, 2011 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Jul 1, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/678
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for varying the transport properties of a film cast from a polymer having at least two polymer end blocks A and at least one polymer interior block B wherein each A block is a polymer block resistant to sulfonation and each B block is a polymer block susceptible to sulfonation, and wherein said A and B blocks do not contain any significant levels of olefinic unsaturation. The method includes casting the polymer using a solvent mixture having two or more solvents selected from the group consisting of polar solvents and non-polar solvents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.