Compositions – Light transmission modifying compositions – Displaying color change
Patent
1996-04-19
1998-06-23
Tucker, Philip
Compositions
Light transmission modifying compositions
Displaying color change
G02B 523
Patent
active
057701156
ABSTRACT:
Describes a composition of a carrier, e.g., organic solvent or polymeric host material, photochromic naphthopyran material, and a stabilizer system comprising (a) polyphenolic antioxidant material, (b) ultraviolet light absorber and (c) hindered amine light stabilizer for said photochromic naphthopyran material. The stabilizer system is selected and used in amounts sufficient to provide at least a 30% reduction in % photopic fatigue of the naphthopyran material. The weight ratio of photochromic naphthopyran to the stabilizer system is from 2.5:1 to 1.5:1. The stabilizer system can comprise 5 to 50 weight percent of the antioxidant material, 5 to 50 weight percent of the ultraviolet light absorbent, and 10 to 90 weight percent of the hindered amine light stabilizer.
REFERENCES:
patent: 3906041 (1975-09-01), Hofer et al.
patent: 4360653 (1982-11-01), Stevens et al.
patent: 4818096 (1989-04-01), Heller et al.
patent: 4826977 (1989-05-01), Heller et al.
patent: 4931221 (1990-06-01), Heller
patent: 4968454 (1990-11-01), Crano et al.
patent: 4980089 (1990-12-01), Heller
patent: 4994208 (1991-02-01), McBain et al.
patent: 5066818 (1991-11-01), Gemert et al.
patent: 5200116 (1993-04-01), Heller
patent: 5200483 (1993-04-01), Selvig
patent: 5238981 (1993-08-01), Knowles
patent: 5244602 (1993-09-01), Van Gemert
patent: 5266447 (1993-11-01), Takahashi et al.
patent: 5274132 (1993-12-01), VanGemert
patent: 5373033 (1994-12-01), Toh et al.
patent: 5384077 (1995-01-01), Knowles
patent: 5391327 (1995-02-01), Ligas et al.
patent: 5395567 (1995-03-01), Van Gemert et al.
patent: 5451344 (1995-09-01), Knowles et al.
patent: 5458814 (1995-10-01), Kumar et al.
patent: 5464567 (1995-11-01), Knowles et al.
patent: 5466398 (1995-11-01), Van Gemert et al.
patent: 5475074 (1995-12-01), Matsuoka et al.
Mallak Frank P.
PPG Industries Inc.
Stein Irwin M.
Tucker Philip
LandOfFree
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