Solvent-based black ink composition
AssigneeOrient Chemical Industries, Ltd.
InventorsTakashi Ono, Tatsuya Yagyu, Yoshihiro Sawatari
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Abstract
According to the present invention, there was provided a non-pollutive ink composition using alcohol or glycol ether as a solvent. The ink composition has excellent stability against an environmental change such as a temperature change, a humidity change, etc., and storage stability in comparison with a conventional salt-formed type dye. Further, the written ink has excellent water resistance and light resistance. It can be used as various quick-drying black dye ink compositions such as writing ink, (industrial) ink-jet printing ink, stamp ink, etc.
Claims9
A solvent-based black ink composition containing:
- (i) an acid added alcohol-soluble disazo basic dye salt represented by the formula:
- ##STR9## wherein R.sup.1 is --H, --CH.sub.3, --OCH.sub.3, --OC.sub.2 H.sub.5, --OCH.sub.2 H.sub.4 OH, --OC.sub.2 H.sub.4 OCH.sub.3, --OC.sub.2 H.sub.4 OC.sub.2 H.sub.5, or --OCH.sub.2 H.sub.4 OC.sub.4 H.sub.9 ;
- and R.sup.2 is --H, --CH.sub.3, --OCH.sub.3, --OC.sub.2 H.sub.5, --NHCOCH.sub.3, or NHCOC.sub.2 H.sub.5 ;
- Y is a basic group represented by the formula:
- ##STR10## wherein R.sup.3 is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group;
- R.sup.4 and R.sup.5 are independently a C.sub.1 -C.sub.4 alkyl group which may be substituted with a hydroxyl group, a halogen atom, a cyano group, or a C.sub.1 -C.sub.4 alkoxy group;
- and a is an integer of 1 to 3;
- A.sup.- is a counter anion consisting of an organic acid having 4 to 20 carbon atoms;
- and n is a numerical value of not more than 1;
- and
- (ii) an alcoholic organic solvent.
Dependencies are inferred from the claim text.