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

Claim 23:
24. A method of producing a spectacle lens comprising 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 the same surface of the substrate as in step b), remotely from the substrate, with at least one primer coat layer 1,
d) covering the spectacle lens obtained in step c), on the same surface of the substrate as in step b), remotely from the substrate, with at least one hardcoat layer 1,
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 primer coat layer 2,
f) covering the spectacle lens obtained in step e), on the same surface of the substrate as in step e), remotely from the substrate, with at least one hardcoat layer 2, wherein at least one of the primer coat layer 1 and the one primer coat layer 2 is a chemically modified primer coat layer 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.