Fluoropolymer coating compositions with multifunctional fluoroalkyl crosslinkers for anti-reflective polymer films

A low refractive index composition for use in an antireflection coating for an optical display, the composition comprising the reaction product of:

• i) a fluoropolymer selected from the group consisting of a Br-containing fluoroelastomer, an I-containing fluoroelastomer, a CN-containing fluoroelastomers, and mixtures thereof, wherein the fluoropolymer is formed from TFE, HFP, VDF, and at least one halogen-containing cure site monomer, halogen-containing chain transfer agent, or CN-containing cure site monomer;
• ii) a fluoroalkyl-containing multi-olefinic crosslinker;
• and
• iii) a plurality of surface modified nanoparticles.

A method for forming an optically transmissive, stain and ink repellent, durable optical display comprising:

• providing an optical display having an optical substrate;
• forming a low refractive index polymer composition comprising
• a fluoropolymer selected from the group consisting of a Br-containing fluoroelastomer,
• an I-containing fluoroelastomer, a CN-containing fluoroelastomers, and mixtures thereof,
• wherein the fluoropolymer is formed from TFE, HFP, VDF, and at least one halogen-containing cure site monomer, halogen-containing chain transfer agent, or CN-containing cure site monomer;
• a fluoroalkyl-containing perfluoropolyether multi-acrylate crosslinker;
• and
• a plurality of surface modified nanoparticles;
• applying a layer of said low refractive index polymer composition to said optical substrate;
• and
• curing said layer to form a cured film.