Photochromic spirooxazine polysiloxanes

Details Photochromic spirooxazine polysiloxanes Photochromic spirooxazine polysiloxanes

1997-08-06

1999-05-18

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

544 71, 252586, 351163, 359241, 359242, 430340, C07F7/08;7/10;7/18

Patent

active

059051485

ABSTRACT:
Polysiloxane copolymers containing both photochromic and lightstabilizing groups with enhanced UV-fatigue resistance can be used as coatings for devices with variable optical density, including lenses, glazing, textiles and the like, to provide light-sensitive darkening effects. The photochromic groups are spironaphtooxazine groups and the lightstabilizing groups are hindered amine light stabilizing (HALS) groups.

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patent: 5322945 (1994-06-01), Krongauz et al.
patent: 5641884 (1997-06-01), Utsunomiya et al.
Crano, J.C. et al., "Spiroxazines and their use in photochromic lenses.", Applied Photochromic Polymer Systems, pp. 31-79 (1992).
Krongauz, V., "Photochromic liquid crystal polymers.", Applied Photochromic Polymer System, pp. 121-173 (1992).
Krongauz, V., "Environmental effects on organic photochromic systems.", chp. 21, pp. 793-821 (1990).

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