65results about How to "Light fastness" patented technology

An inkjet recording method of forming an image on an inkjet recording sheet that has, on a support, a colorant-receiving layer which contains at least one inorganic mordant, by using an inkjet recording ink set that comprises, as minimum constituent elements thereof, a yellow ink which contains at least one yellow dye, a magenta ink which contains at least one magenta dye and a cyan ink which contains at least one cyan dye, wherein an oxidation potential of the magenta dye and an oxidation potential of the cyan dye are each nobler than 0.8 V (vs SCE).

The invention relates to an ink composition comprising a dye, wherein said dye comprises a structure of Formula I: wherein R1 represents a hydrogen atom, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, an alkylthio group, an arylthio group an acyl group, a substituted acyl group, a carboxyl group, a carbamoyl group, or a heterocyclic group; Za represents one of —N═, —NH— or —C(R8)═; and Zb and Zc each independently represents one of —N═or —C(R8)═; R8 represents a hydrogen, a substituted or unsubstituted alkyl or a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group or a heterocyclic group; [0001]R2 represents a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a halogen, a cyano group, a carboxyl or substituted carboxyl group, an acyl group, a substituted acyl group, a carbamoyl group, a nitro group, an alkyl or aryl sulfone, a sulfonic acid, a substituted or unsubstituted primary or secondary alkyl sulfonamide, a substituted or unsubstituted aryl sulfonamide or a heteroaryl group; [0002]R3 may be hydrogen or any non-metallic group; [0003]R4, R5, R6 may be H or any non-metallic group with the proviso that at least one of R4 or R6 represents any ionizable group which is capable of imparting water solubility to the dye; [0004]R5 may be present in any other position on the aromatic ring that is not occupied by R4 or R6.

Dyed yarns typically have inferior color fastness compared with pigmented yarns. However, dyeing offers a virtually infinite selection of colors, flexibility and more uniformity than constructions of pigmented yarns in residential carpet and other yarn applications, such as apparel. It has been found that relatively small amounts of pigment (10 to 1000 ppm) incorporated into polymeric fibers, and particularly nylon fibers used in carpets, creates lightly pigmented yarns which, when overdyed, are highly uniform and have a higher degree of apparent dye light fastness compared to normal dyed yarns. This effect is observable for both anionic and cationic polyamide polymers, and dyeing of these slightly pigmented yarns can be conducted to produce yarns of almost any color of greater depth than the base yarn.

To provide an inkjet black ink having excellent image durability and ink discharge properties and an ink set, the inkjet black ink, which contains a dye having a λmax of from 500 nm to 700 nm and a half-band width of 100 nm or more in an absorption spectrum of a diluted solution standardized at an absorbance of 1.0 at the λmax, has the change ratio of absorbance at the λmax in the visible region, specified in the specification; and the inkjet ink set containing at least two black inks having different densities has the relationship among the at least two black inks, specified in the specification.