Pre-expanded ion exchange membranes.

摘要

Pre-swelled ion exchange membranes formed from one or more layers of fluorinated polymer having carboxylic or sulfonic acid functional groups and which polymer contains about 8 to 30% by weight of a swelling agent of the formula HO(CH<Sub>2</Sub>CHYO)<Sub>n</Sub>H where Y = H or CH<Sub>3</Sub> and n = 2. 3 or 4 are disclosed. Also disclosed are processes for preparing these membranes, electrochemical cells utilizing these membr- ances, and methods of preparing said cells for use in chloralkali processes.