Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1998-10-23
2000-05-09
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 3147, 106 3148, 106 3151, 106 315, 106 3152, 106 3149, 427466, 428195, 430106, C09D 1102, G03G 909, B32B 300, B32B 2714
Patent
active
060598700
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to compositions and solutions thereof, suitable for use in printing and imaging technologies, especially those suitable for coloration of substrates such as paper, plastics, textiles, metal and glass by printing processes such as ink jet printing and those suitable for use in electrophotography such as toners.
Ink jet printing is a non-impact printing technique which involves ejecting, thermally or by action of an oscillating piezo crystal, droplets of ink continuously or on demand from a fine nozzle directly onto a substrate such as paper, plastics, textile, metal or glass. The ink may be aqueous, solvent or hot melt based and must provide sharp, non-feathered images which have good waterfastness, light fastness and optical density, have fast fixation to the substrate and cause no clogging of the nozzle.
Electrophotographic copiers or printers generally comprise an organic photoconductor (OPC) and a developer or toner. The OPC generally comprises an electrically conducting support, a charge generating layer and a charge transport layer. The electrically conducting support is a metal drum, typically an aluminium drum, or a metallised polymer film, typically aluminised polyester. The charge generating layer comprises a charge generating material (CGM) and a binder resin, typically a polycarbonate. The charge transport later comprises a charge transport material (CTM) and a binder resin, typically a polycarbonate. The developer or toner comprises a toner resin, a colorant and optionally a charge control agent (CCA). The toner resin is typically a styrene or substituted styrene polymer or styrene-butadiene copolymer. The colorant is typically a dye or pigment or mixture thereof.
According to a first feature of the present invention there is provided an ink composition comprising a water-soluble reactive dye comprising at least three chromophoric groups linked to a polyamine; and a medium comprising at least one of a low melting point solid, an organic solvent and a mixture of water and one or more water-soluble organic solvent(s).
The water-soluble reactive dye preferably comprises 3, 4 or 5, more preferably 3 or 4, especially 3 chromophoric groups linked to a polyamine. The chromophoric groups can be different from each other, but they are preferably identical to each other.
The polyamine to which the chromophoric groups are linked preferably consists of at least three amino groups, more preferably three to six, especially three or four amino groups, joined together by optionally substituted aliphatic groups. The amino groups are preferably attached to one or two --CH.sub.2 -- groups (as illustrated in --HN--CH.sub.2 -- and --CH.sub.2 --N(-)--CH.sub.2 --). Preferred polyamines are linear polyamines, for example of the Formula (I), or branched polyamines, for example of Formula (II), wherein each R.sup.1 independently is H or optionally substituted alkyl, n has a value of 2 to 10, preferably 2 to 6, more preferably 2, and p has a value of 2 to 6, more preferably 2 or 3: ##STR1##
Reactivity of the dyes is preferably provided by means of a reactive triazine or pyrimidine group, more preferably a reactive triazine group linking the chromophoric groups to amino groups in the polyamine. The reactive triazine group is preferably an s-triazine group having a labile atom or group at the 2-,4 or 6-position, for example a group of the formula: ##STR2## wherein Y is a labile atom or group.
In light of the above preference for amino groups being attached to --CH.sub.2 -- groups and the chromophoric groups being linked to the nitrogen atoms by means of reactive triazine groups it is preferred for the water-soluble reactive dyes to contain at least 3, more preferably 3,4 or 5, especially 3 or 4, more especially 3 groups of the Formula (III): ##STR3## wherein: m is from 1 to 6;
Preferably m is 2, 3 or 4, more preferably 2 or 3, especially 2. H, methyl or --CH.sub.2 CH.sub.2 --, especially H or --CH.sub.2 CH.sub.2 --.
As will be understood, when Q is H or optionally substituted alkyl the chromop
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Gregory Peter
Taylor John Anthony
Klemanski Helene
Zeneca Limited
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