Patent ID: 7553514

Claim:
An antireflective article comprising a substrate having an antireflective surface and a coating of a perfluoropolyether silane thereon, said perfluoropolyether silane is of the formula: R f [—R 1 —C 2 H 4 —S—R 2 —Si(Y) x (R 3 ) 3-x ] y , wherein R f is a mono- or divalent perfluoropolyether group, R 1 is a covalent bond, —O—, or a divalent alkylene or arylene group, or combinations thereof, said alkylene groups optionally containing one or more catenary oxygen atoms; R 2 is a divalent alkylene or arylene group, or combinations thereof, said alkylene groups optionally containing one or more catenary oxygen atoms; Y is a hydrolysable group, and R 1 is a monovalent alkyl or aryl group, x is 1, 2 or 3, preferably 3, and y is 1 or 2; wherein the perfluoropolyether silane coating is at least about 15 Angstroms thick.