Tinting optical substrates
AssigneeCarl Zeiss Vision Australia Holdings Limited
InventorDavid Robert Diggins
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Abstract
The present invention provides a method for tinting an optical substrate. The method includes the steps of applying a coating composition containing: a polymerisable monomer having a polyoxyalkylene backbone containing at least four contiguous oxyalkylene units, and an abrasion resistant agent and/or a high crosslinking polymerisable monomer to the optical substrate, polymerising the coating composition to form an abrasion resistant coating layer, and introducing a tinting compound into the coating layer to thereby tint the optical substrate. The invention also provides a coating composition and an optical substrate that is tinted according to the method of the invention.
Claims18
A coating composition that is suitable for forming an abrasion resistant tintable coating layer on an optical substrate, the coating composition including:
- a polymerisable monomer having a polyoxyalkylene backbone containing at least four contiguous oxyalkylene units, and
- an abrasion resistant agent and a high crosslinking polymerisable monomer,
- wherein the coating composition is polymerisable to form an abrasion resistant coating layer on the optical substrate into which a tinting compound can be introduced, and
- wherein the relative amounts of the abrasion resistant agent (y) as a percentage w/w of solids and the high cross linking monomer (x) as a percentage w/w of monomers is between y=−0.76x+68 and y=−0.60x+30.
Dependencies are inferred from the claim text.