| abstract |
The present invention relates to a film which can be obtained by curing the composition, wherein the composition comprises (i) at least two (meth) acrylic groups and a sulfonic acid group, wherein MW < (300 + 300n) N is a number of 1, 2, 3 or 4, and the number of sulfonic acid groups present in the curable compound); And optionally (ii) a curable compound having one ethylenically unsaturated group, wherein the mole fraction of the curable compound comprising at least two (meth) acrylic groups, relative to the total number of moles of the curable compound present in the composition Is not less than 0.25. |