Photoreactive lenses

Details Photoreactive lenses Photoreactive lenses

G - Physics

03

C

31/105, 117/23

G03C 1/685 (2006.01) C07D 295/033 (2006.01) C07D 311/92 (2006.01) C07D 493/04 (2006.01) G02B 1/04 (2006.01) G02B 3/00 (2006.01) G02B 5/23 (2006.01)

Patent

CA 1306643

ABSTRACT PHOTOREACTIVE LENSES Photoreactive plastics lenses are disclosed which are coated or impregnated with an adamantane 2-spiro-benzo or naphthopyran and with a blue colouring photochromic benzo- or naphthopyran having a nitrogen containing substituent in the 2-position in the pyran ring. The lenses darken in sunlight and fade rapidly at ambient temperatures in the dark or in white light which does not contain a U.V. component. The combination of the yellow/orange colouring adamantane 2-spiro pyran compound with the purple/blue colouring pyran gives a desired brown/grey colouration in the sunlight-darkened lens-. The invention includes novel blue-colouring pyran compounds in which the nitrogen-containing substituent in the 2-position is a phenyl group having an amino or substituted amino or nitrogen-containing heterocyclic substituent in the ortho- or para-position of the phenyl group.

539840

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