C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 50/36 (2006.01) C07C 50/24 (2006.01) C07C 65/40 (2006.01) C07C 69/94 (2006.01) C07C 255/56 (2006.01) C07C 323/22 (2006.01) C09B 3/58 (2006.01) C09K 9/02 (2006.01) G02B 5/23 (2006.01) G03C 1/73 (2006.01)
Patent
CA 2056854
FL/6-18446/A Photochromic naphthacenequinones, their preparation and the use thereof Abstract of the Disclosure Compounds of formula I or V or mixtures thereof Image (I), wherein R is unsubstituted C6-C14aryl or C6-C14aryl which is substituted by C1-C12alkyl,C1-C12alkoxy, C1-C12alkylthio, phenyl, benzyl, -CN, -CF3, halogen or -COOR5, and R5 is H, C1-C18alkyl, cyclohexyl, cyclopentyl, phenyl, C1-C12alkylphenyl, benzyl or C1- C12alkylbenzyl, and at least one of the substituents R1 to R4 is -F, -Cl or -Br, or is independently the group RO-, and the other substituents R1 to R4 are H, -F, -Cl or -Br, are reversible photochromic systems which can be used for contrast formation, light absorption or for the reversible optical storage of information.
Finter Jurgen
Fischer Walter
Spahni Heinz
Ag Ciba-Geigy
Fetherstonhaugh & Co.
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