Patent ID: 8328929

Claim:
A composition crosslinkable by the cationic route to obtain a hard coating, said composition comprising: (a) colloidal particles of nonfunctionalized silica: (b) at least one crosslinkable and/or polymerizable silicone monomer, oligomer and/or polymer comprising: at least one structural unit of formula (I):) Z 1 (R 0 ) a SiO (3-a)/2 (I) in which: a=0, 1 or 2; the radicals R 0 , which may be identical or different when a>1, are each an alkyl, cycloalkyl, aryl, or vinyl radical or a hydrogen atom; the radicals Z 1 , which may be identical or different when the number of units of formula (I) is greater than 1, are each an organic substituent comprising at least one epoxy and/or alkenyl ether and/or oxetane and/or dioxolane and/or carbonate reactive functional group; and a total number of silicon atoms per molecule at least equal to 2; and (c) an effective amount of at least one cationic initiator; (d) an antifouling compound comprising at least one perfluoropolyether compound of formula (IV): Y—(C a F 2a O) b —C a F 2a —Y (IV) in which: Y is a polymerizable group or a fluorine or a hydrogen; a ranges from 1 to 7; b ranges from 1 to 300, such that said perfluoropolyether compound has an average molecular mass of from 500 to 20,000, and (e) optionally, at least one organic solvent.