Patent ID: 9394414
Filing Date: 2016-07-19
CPC Classification: B01D,B32B,C08F,C08J,C08L,C09D,Y10T

Claim Text:
1. A film comprising a) at least one elastomeric styrenic block copolymer which is optionally functionalized with functional groups different from sulfonic acid or sulfonate ester functional groups, b) at least one sulfonated block copolymer having at least one end block A and at least one interior block B wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol % sulfonic acid or sulfonate ester functional groups based on the number of sulfonation susceptible monomer units of the B block, and wherein (a) and (b) are present in weight a ratio of from about 0.1:1 to about 10:1.