Composition of an oligomeric fluorosilane and surface treatment of retroreflective sheet
Assignee3M Innovative Properties Company
InventorsGert A. M. Hooftman, Dorothee B. Loosen
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Abstract
The invention relates to a method of treatment of a retroreflective sheet with a treatment composition that comprises a fluorinated compound having one or more silyl groups and an auxiliary compound selected from the group consisting of (i) one or more non-fluorinated compounds of an element M selected from Si, Ti, Zr, B, Al, Ge, V, Pb and Sn and (ii) an organic compound having a Si—H group. The invention also relates to compositions comprising (i) a fluorinated compound comprising one or more silyl groups and (ii) an auxiliary compound selected from the group consisting of organic compounds having a Si—H group.
Claims9
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.
Method of treatment comprising contacting a retroreflective sheet comprising (i) a binder layer having at one of its major surfaces a layer of nticrospheres 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 corupri sing:
- (i) a fluorinated compound comprisina one or more fluorinated polyether groups having one or more fluorinated groups and one or more silyl groups that have one or more hydrolysable groups;
- 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, (2an organic compound having a Si—H group and mixtures thereof.
Dependencies are inferred from the claim text.