Photochromic polymeric article

Details Photochromic polymeric article Photochromic polymeric article

C - Chemistry, Metallurgy

08

L

C08L 33/06 (2006.01) C08F 218/00 (2006.01) C08L 75/14 (2006.01) G02B 1/04 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2051443

(57) Abstract A photochromic article having improved photochromic equilibrium response is described In particular, a photochromic compound is incorporated into or applied to an article, e.g., matrix, of a synthetic organic resin prepared from a composition comprising from about 55 to about 90 weight percent of a polyol(allyl earbonate), e.g., diethylene glycol bis(allyl carbonate), from about 10 to about 40 weight percent of an aliphatic polyurethan having terminal ethylenic unsaturation, e.g., an aliphatic polyes- terurethan diacrylate, and from about 0 to about 5 weight percent of a difunctional monomer selected from the group consisting of allyl methacrylate and allyl acrylate. Such photochromic articles have an improved photochromic equilibrium response at am- bient temperatures compared to the response of a comparable photochromic article prepared from a polyol(allyl carbonate) hom- opolymer, e.g., homopolymers of diethylene glycol bis(allyl carbonate), at the same ambient temperatures.

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