Plastic lens and process for preparing the lens

Details Plastic lens and process for preparing the lens Plastic lens and process for preparing the lens

G - Physics

02

B

G02B 1/04 (2006.01) B29D 11/00 (2006.01) C08F 2/44 (2006.01) C08F 18/24 (2006.01) C08J 5/00 (2006.01) G02B 1/10 (2006.01)

Patent

CA 2482188

A plastic lens which absorbs ultraviolet light having wavelength of about 400 nm and suppresses coloring and a process for producing the lens. A plastic lens may be made from a composition which comprises (A) a lens material monomer comprising diethylene glycol bisallylcarbonate , (B) an organic peroxide-based polymerization initiator, (C) a cobalt compound represented by at least one of CoO-Al2O3 and Co-Al2O4, and (D) at least one ultraviolet light absorbent selected from 2-hydroxy-4- octyloxy-benzophenone, 2,2',4,4'-tetrahydroxy-4-octyloxybenzophenone and 2,2',4'- trihydroxy-4- octyloxybenzophenone. A process for producing a plastic lens comprises mixing component (A), component (B), a cobalt fluid comprising component (C) in a dispersant and component (D) and a step of casting the mixed fluid into a mold and polymerizing the fluid to obtain a plastic lens.

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