Antifog compositions and articles made thereof

An article comprising:

• a substrate and an antifog coating layer provided on at least one surface of the substrate;
• wherein the antifog coating layer comprises a sulfonated styrenic block copolymer having at least one block A, at least one block B, and at least one block D, wherein:
• block A is a polymer block resistant to sulfonation and selected from polymerized:
• (i) para-substituted styrene monomers, (ii) ethylene, (iii) alpha olefins of 3 to 18 carbon atoms, (iv) 1,3-cyclodiene monomers, (v) monomers of conjugated dienes having a vinyl content less than 35 mole % prior to hydrogenation, (vi) acrylic esters, (vii) methacrylic esters, and (viii) mixtures thereof,
• block B is a polymer block susceptible to sulfonation and derived from a vinyl aromatic monomer, wherein the block B has a degree of sulfonation of >10 mole %, and
• block D is a polymer block resistant to sulfonation and derived from a conjugated diene monomer;
• wherein the antifog coating layer is characterized as having:
• a Tfog of >8 seconds, measured according to ASTM F659, and
• a yellowness index (ΔYI) of <4, measured according to ASTM E313;
• and
• wherein the sulfonated styrenic block copolymer in the antifog coating layer has a morphology consisting of at least 50% interconnected channels.