Stabilisation of compounds, and the use of stabilised compounds

Details Stabilisation of compounds, and the use of stabilised compounds Stabilisation of compounds, and the use of stabilised compounds

C - Chemistry, Metallurgy

09

K

31/163

C09K 11/06 (2006.01) G03C 1/73 (2006.01)

Patent

CA 1178046

-24- ABSTRACT: The stabilisation of selected photochromic compounds, selected from certain fulgides and fulgimides, is made possible by associating with such compounds a clay mineral having an expanding crystal lattice, which can stabilize a selected photochromic compound in a higher-energy coloured form. The stabilized photochromic compound may be one included in a coating composition, such as a paper coating composition, or may constitute or be incorporated in a filler for a papermaking furnish or for a plastics material. The stabilizer serves to maintain the photochromic compound in its higher-energy coloured state or one of its higher-energy coloured states, thereby tending to prevent deterioration of colour as the photochromic compound converts to an uncoloured or weakly coloured lower-energy state.

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