Compositions – Light transmission modifying compositions – Displaying color change
Patent
1989-04-18
1991-02-19
Maples, John S.
Compositions
Light transmission modifying compositions
Displaying color change
350354, 524555, 525404, 525455, 525920, 526301, 526310, 526314, 351163, 430345, 430962, 252582, G02B 523, C08J 5500, C08F 1228, G03C 1727
Patent
active
049942085
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 carbonate), 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 polyesterurethan 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 ambient temperatures compared to the response of a comparable photochromic article prepared from a polyol(allyl carbonate) homopolymer, e.g., homopolymers of diethylene glycol bis(allyl carbonate), at the same ambient temperatures.
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Crano John C.
McBain Douglas S.
Maples John S.
PPG Industries Inc.
Stein Irwin M.
Tucker Philip
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