The present invention relates to a sulfonic acid group-containing polymer excellent in ion conductivity and durability, a method for producing the same, a resin composition containing the sulfonic acid group-containing polymer, a polymer electrolyte membrane, a polymer electrolyte membrane/electrode assembly, and a fuel cell. The sulfonic acid group-containing polymer of the present invention, in a first embodiment, includes a constituent represented by the following chemical formula 1: ##STR00001## wherein X represents hydrogen or a monovalent cation species; Y represents a sulfone group or a ketone group; and n represents an arbitrary integer not less than 2.

 
Web www.patentalert.com

< Cinnamic Acid To Inhibit Heat- And Light-Induced Benzene Formation In Benzoate-Preserved Carbonated And Non-Carbonated Beverages And Foods While Maintaining Or Improving Product Microbial Stability

> EXPOSURE APPARATUS AND METHOD OF MANUFACTURING DEVICE

> SILVER HALIDE COLOR PHOTOGRAPHIC LIGHT-SENSITIVE MATERIAL

~ 00504