Highly sulfonated block copolymer hydrogels and uses thereof

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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C525S343000, C525S348000, C525S189000, C525S333500, C525S344000, C521S028000, C521S033000

Reexamination Certificate

active

10828521

ABSTRACT:
A block copolymer composition AB is provided that has pendent groups —RZ extending from the A copolymer on at least 70 mol % of the A monomers, where R and Z are each an ionic species. The composition is included in a semipermeable membrane for use in a direct methanol fuel cell. Also described are articles of protective apparel comprising the composition which advantageously has barrier properties as well as superior water vapor transport properties.

REFERENCES:
patent: 3553286 (1971-01-01), Murata et al.
patent: 4086171 (1978-04-01), Wood et al.
patent: 5039752 (1991-08-01), Storey et al.
patent: 6579948 (2003-06-01), Tan et al.

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