B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
B05D 5/06 (2006.01) B41M 5/28 (2006.01) C07D 487/22 (2006.01) C08K 5/00 (2006.01) G02B 1/10 (2006.01) G02B 5/22 (2006.01) G11B 7/24 (2006.01)
Patent
CA 2176290
The present invention provides a process for the preparation of a material comprising a substrate on whose surface there is at least one pigment coating consisting of one or more pigments of the formula (I) or (II) or derivatives thereof A(D1)(D2)x (I) Pc (II) in which A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, azo, quinophthalone, isoindolinone, isoindoline, dioxazine, phthalocyanine or diketopyrrolopyrrole series which contains nitrogen atoms attached to D1 and to x D2, each nitrogen atom present in A being able independently of the others to be attached to 0, 1 or 2 groups D1 or D2, D1 and D2 are hydrogen, x is an integer from 0 to 4, and Pc is a chromophore of the phthalocyanine series, which is applied by (a) coating the substrate with a solution or melt of at least one latent pigment of the formula (III) or (IV), A(D3)(D4)x (III) (IV) Image and (b) converting the latent pigment partially or completely into its insoluble pigment form by eliminating groups D3 and D4, or by eliminating groups L1 and L2. The invention also relates to a structured material prepared in this way, to its use as a colour filter or for the permanent storage of digital information, and to a method of reading out digital information stored thereon by irradiation with a light source and measurement of the intensity of the reflected or transmitted light beam.
Hofmann Manfred
Zambounis John
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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