Production process of plastic photochromic lens

Details Production process of plastic photochromic lens Production process of plastic photochromic lens

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 39/00 (2006.01) B29C 39/12 (2006.01) G02B 1/04 (2006.01) G02B 5/23 (2006.01) G02C 7/02 (2006.01) G02C 7/10 (2006.01)

Patent

CA 2169203

Disclosed herein is a production process of a plastic photochromic lens which is excellent in the weather resistance of its photochromic function, has uniform photochromic effects all over the aperture of the lens and can sufficiently exhibits the performance of a photochromic compound to be contained in the lens. The process is a process for the production of a plastic photochromic lens including a lens base made of a synthetic resin and a photochromic layer provided on one surface of the lens base and formed of a synthetic resin, and includes the steps of arranging a mold element for molding the photochromic layer on the side of the one surface of the lens base so as to oppose a molding surface thereof to the one surface of the lens base, thereby defining a cavity for molding the photochromic layer with a uniform thickness between the one surface of the lens base and the mold element for molding the photochromic layer; and polymerizing a polymerizable material for forming the photochromic layer, which contains at least one photochromic compound, in the cavity for molding the photochromic layer, thereby forming the photochromic layer.

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