Antireflection film, polarizing plate, and image display device

An antireflection film comprising a support and a low refractive index layer prepared by coating a coating composition containing the following components:

• (A) a fluorine-containing polymer having, a principal chain which is made of only carbon atoms and the fluorine-containing polymer contains at least one fluorine-containing vinyl monomer polymerization unit and at least one hydroxyl group-containing vinyl monomer polymerization unit, wherein a content of the hydroxyl group-containing vinyl monomer polymerization unit exceeds 20% by mole, provided that the polymer does not have a polysiloxane structure in the principal chain;
• (B) a crosslinking agent that reacts with a hydroxyl group;
• and
• (D) an organosilane compound or a composition containing at least one of a hydrolyzate of the organosilane compound and a partial condensate of the organosilane compound,
• wherein the fluorine-containing polymer contains at least one polymerization unit having a graft site containing, in a side chain thereof, a polysiloxane repeating unit represented by the following formula (1):
• wherein R1 and R2 may be the same or different and each represents an alkyl group or an aryl group;
• and p represents an integer of from 10 to 500;
• and
• wherein the coating composition further contains at least one salt comprising an organic base having a pKa of from 5.0 to 10.5 in terms of a conjugated acid thereof and an acid.

An antireflection film comprising a support and a low refractive index layer prepared by coating a coating composition containing the following components:

• (A) a fluorine-containing polymer having, a principal chain which is made of only carbon atoms and the fluorine-containing polymer contains at least one fluorine-containing vinyl monomer polymerization unit and at least one hydroxyl group-containing vinyl monomer polymerization unit, wherein a content of the hydroxyl group-containing vinyl monomer polymerization unit exceeds 20% by mole, provided that the polymer does not have a polysiloxane structure in the principal chain;
• (B) a crosslinking agent that reacts with a hydroxyl group;
• and
• (E) an inorganic particle having a particle size of 1 nm or more and not more than 100 nm,
• wherein the fluorine-containing polymer contains at least one polymerization unit having a graft site containing, in a side chain thereof, a polysiloxane repeating unit represented by the following formula (1):
• wherein R1 and R2 may be the same or different and each represents an alkyl group or an aryl group;
• and p represents an integer of from 10 to 500;
• and
• wherein the coating composition further contains at least one salt comprising an organic base having a pKa of from 5.0 to 10.5 in terms of a conjugated acid thereof and an acid.