Patent ID: 11874534
Assignee: CARL ZEISS VISION INTERNATIONAL GMBH
Field: Optics (Instruments)
Classification: CPC G  B | IPC G

Claim 39:
40. A method of producing a spectacle lens comprising at least one substrate and at least one photochromic layer, wherein the method comprises the following steps:
a) providing at least one substrate to be coated,
b) coating at least one surface of the substrate to be coated with at least one photochromic layer,
c) covering the spectacle lens obtained in step b), on the same surface of the substrate as in step b), remotely from the substrate, with at least one acrylate-epoxy layer,
d) covering the spectacle lens obtained in step c), on the same surface of the substrate as in step c), remotely from the substrate, with at least one primer coat layer and
e) covering the spectacle lens obtained in step d), on the same surface of the substrate as in step d), remotely from the substrate, with at least one hardcoat layer,
wherein the at least one acrylate-epoxy layer is produced using a coating composition comprising:
i. at least one acrylate and/or at least one methacrylate;
ii. at least one epoxy compound;
iii. at least one colloidal inorganic oxide, hydroxide, oxide hydrate, fluoride, and oxyfluoride, or a mixture thereof, which, optionally, has been surface-modified;
iv. at least one solvent;
v. at least one photoinitiator; and
vi. optionally, at least one additive,

wherein a total amount of the at the least one acrylate and/or the at least one methacrylate in the coating composition is within a range from 4.0% by weight to 25.0% by weight, based on a total weight of the coating composition.