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Naphthopyran Photochromic Dyes Sensitive to pH

Clarke, David A., Heron, B. Mark, Gabbutt, Christopher D., Hepworth, John D., Partington, Steven M. and Corns, Stephen N. (1999) Naphthopyran Photochromic Dyes Sensitive to pH. WO/1999/031081.

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Naphthopyrans of formula (I) or (II) reversibly change their optical properties (colour, induced optical density and/or colourability) with changes of pH. In the formulae, R?1¿ and R?2¿ are hydrogen or certain hydrocarbyl or heterocyclic groups, R?3¿ is an amino functional group or certain oxygen, sulphur or phosphorus groups; and R?4¿ may be certain C¿1?-C¿20? linear or branched alkoxy or alkyl (substituent) groups or is chosen from R?1¿, R?2¿ or R?3¿; and each n is 0 or 1 to 6, the total of all n's being no more than 6.

Item Type: Patent
Subjects: Q Science > QD Chemistry
Schools: School of Applied Sciences
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Depositing User: Graham Stone
Date Deposited: 19 Oct 2012 13:38
Last Modified: 28 Aug 2021 11:23


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