Patent ID: 7247386

Claim:
Method of treatment comprising contacting a retroreflective sheet comprising (i) a binder layer having at one of its major surfaces a layer of microspheres having a portion partially embedded in said major surface of said binder layer and having a portion partially protruding therefrom and (ii) a reflective layer disposed on the embedded portion of the microspheres, with a treatment composition comprising: (i) a fluorinated compound having one or more fluorinated groups and one or more silyl groups that have one or more hydrolysable groups, wherein said fluorinated compound is an oligomer derived from a polymerization of at least one fluorinated monomer in the presence of a chain transfer agent and optionally one or more non-fluorinated monomers; and (ii) an auxiliary compound selected from the group consisting of (1) one or more non-fluorinated compounds of an element M selected from the group consisting of Si, Ti, Zr, B, Al, Ge, V, Pb and Sn having at least one hydrolysable group per molecule, (2) an organic compound having a Si—H group and mixtures thereof.