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

Claim 10:
11. A method of producing a spectacle lens having at least one substrate and at least one photochromic layer, the method comprising:
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 a same surface of the substrate as in step b), remotely from the substrate, with at least one hardcoat layer 1;
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 a 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 2,
 wherein the at least one primer coat layer is a chemically modified primer coat layer that has been produced with a coating composition comprising:
i) at least one of:
an aqueous aliphatic, cycloaliphatic, aromatic, or heteroaromatic polyurethane dispersion;
an aqueous aliphatic, cycloaliphatic, aromatic, or heteroaromatic polyurea dispersion;
an aqueous aliphatic, cycloaliphatic, aromatic, or heteroaromatic polyurethane-polyurea dispersion; or
an aqueous aliphatic, cycloaliphatic, aromatic or heteroaromatic polyester dispersion;

ii) at least one solvent;
iii) at least one base; and
iv) optionally, at least one additive.