Patent ID: 11945895
Assignee: ALCON INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 4:
5. The photochromic polydiorganosiloxane vinylic crosslinker of claim 4, wherein PC is a monovalent organic radical that has one colorless or light-colored form and one colored form and can undergo reversible change from the colorless or light-colored form to the colored form upon exposure to UV-irradiation or HEV light and that is derived directly from at least one reactive photochromic compound that has a reactive functional group, designated as “EPC”, selected from the group consisting of, , wherein the EPC has participated in a coupling reaction with a co-reactive functional group to form a covalent linkage of XPC.