Coating composition and optical mar-resistant tintable coating
AssigneeQuest Optical, Incorporated
InventorAgustin Alberto de Rojas
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Abstract
A coating composition and coating for ophthalmic lenses and other polymeric substrates having a unique combination of excellent solution stability, rapid cure rate, improved mar resistance, rapid dye absorption, and improved receptivity towards antireflective coatings. The coating comprises an abrasion resistant polymer and a dye-absorption-enhancing oligomer. The coating is tinted after curing with a dye to provide light absorbency in the coating.
Claims18
A method of providing a coated mar resistant layer on a polymeric article having at least one exposed surface comprising coating a composition onto the exposed surface of the polymeric surface, the composition comprising:
- a) at least one organofunctional trialkoxysilane monomer in the amount of from 20 to 80 percent by weight of the composition, said trialkoxysilane monomer having the formula
- where R1, R2, and R3 are independently selected from alkyl groups of 1 to 8 carbon atoms;
- n is an integer 1 through 6, inclusive,
- and X is selected from the group consisting of glycidyl, acrylate, methacrylate, acrylantide, methacrylamide, N-methylacrylaniide, N-methylmethacrylamide, vinyl, and allyl;
- b) water to hydrolyze at least one third of alkoxy groups of the trialkoxysilane monomer;
- and
- c) from 1.0 to 25.0 percent by weight at least one oligomeric tintability enhancer polymerizing at least the trialkoxysilane component of the composition to form a polymerized coating, immersing the polymeric article in an aqueous solution of disperse dye so that the mar resistant layer is directly exposed to the aqueous solution, and absorbing sufficient dye into the polymerized coating to absorb at least 70% of incident visible radiation at a maximum wavelength of absorption of the disperse dye.
A method of providing a coated mar resistant layer on an article consisting of polymeric ophthalmic lens having at least one exposed surface, the exposed surface having a single coating layer thereon comprising coating a composition comprising:
- where R1, R2, and R3 are independently selected from alkyl groups of 1 to 8 carbon atoms;
- n is an integer 1 through 6, inclusive,
- and X is selected from the group consisting of glycidyl, acrylate, methacrylate, acrylamide, metbacrylaniide, N-methylacrylamide, N-methylmethacrylamide, vinyl, and allyl;
- b) water to hydrolyze at least one third of alkoxy groups of the trialkoxysilane monomer;
- and
- c) from 1.0 to 25.0 percent by weight at least one oligomeric tintability enhancer onto the exposed surface of the polymeric surface, polymerizing at least the trialkoxysilane component of the composition, to form a polymerized coating immersing the polymeric article in an aqueous solution of disperse dye so that the mar resistant layer is directly exposed to the aqueous solution, and absorbing sufficient dye into the polymerized coating to absorb at least 70% of incident visible radiation at a maximum wavelength of absorption of the disperse dye.
The method of 17 wherein the aqueous solution is at a temperature of between 85 and 99° C.
Dependencies are inferred from the claim text.