C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 11/00 (2006.01) B41F 1/10 (2006.01) B41J 27/00 (2006.01) C09B 67/24 (2006.01) C09D 11/02 (2006.01) C09D 11/16 (2006.01)
Patent
CA 2249710
The invention concerns a colouring agent which contains water and one or a plurality of water-soluble dyes with anionic groups which have a pKa value which is essentially not above A, combined with the precursor of a first auxiliary substance, the first auxiliary substance as such having the pKa value C and C being greater or smaller than A or equal to A. The invention further concerns a printing or writing process using a colouring agent of this type.
L'invention concerne un colorant qui contient de l'eau, un ou plusieurs colorant(s) à groupes anioniques dont la valeur pK¿a? ne dépasse sensiblement pas A, en combinaison avec le progéniteur d'un premier auxiliaire, ledit premier auxiliaire en tant que tel présentant la valeur pK¿a? C et C pouvant être supérieure ou inférieure à A ou être égale à A. L'invention concerne en outre un procédé d'impression ou d'écriture faisant appel à un colorant de ce type.
Gowling Lafleur Henderson Llp
Kaufmann Rainer
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