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

2007-08-28

2007-08-28

Niland, Patrick (Department: 1714)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

C252S588000, C252S589000, C264S001320, C264S331210, C264S331130, C351S041000, C351S045000, C351S163000, C428S412000, C523S106000, C524S335000, C524S336000, C524S337000, C524S338000, C524S339000, C524S340000, C524S431000, C524S543000, C524S558000

Reexamination Certificate

active

10952858

ABSTRACT:
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.Al2O3and 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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