Lens with stain resistant surface layer

Details Lens with stain resistant surface layer Lens with stain resistant surface layer

2005-10-25

2005-10-25

Gulakowski, Randy (Department: 1712)

Stock material or miscellaneous articles

Composite

Of silicon containing

C427S387000, C427S167000, C427S294000, C351S159000, C351S16000R, C351S166000

Reexamination Certificate

active

06958191

ABSTRACT:
A lens including a lens substrate, a surface layer, and a backing member provided beneath the surface layer, in which the backing member may be either the same as the lens substrate or a separate layer from the lens substrate, and wherein the surface layer includes a hydrolysis-condensation product of a perfluoropolyether modified silane with a hydrolysable functional group or a halogen atom X at both terminals, represented by a general formula (1) shown below:(wherein, Rf is a bivalent group with a straight chain perfluoropolyether structure containing no branching, which incorporates a unit represented by a formula —(CkF2kO)— (wherein, k represents an integer from 1 to 6)) is resistant to the adhesion of contaminants to the surface thereof, can be easily wiped to remove any adhered contaminants, provides a slippery surface that is difficult to scratch, and moreover displays excellent durability and is capable of retaining the above properties over extended periods.

REFERENCES:
patent: 5763061 (1998-06-01), Ochiai et al.
patent: 6277485 (2001-08-01), Invie et al.

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