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Aqueous ink for ink-jet printing
| Details |
Inventors: Fujii, Tadashi; Yamaguchi, Tomoyuki; Murakami, Kakuji; Kawakami, Tomiko; Uenozono, Hiroko;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Lieberman; Paul
Assistant Examiner: Yarbrough; Amelia B.
Attorney, Agent or Firm: Flynn, Thiel, Boutell & Tanis
An aqueous ink for ink-jet printing comprises as its main components (i) a water-soluble direct dye and/or acid dye, (ii) a polyhydric alcohol and/or an alkyl ether thereof, (iii) water, and (iv) at least one water-soluble non-ionic surface active agent selected from the group consisting of a polyoxyethylene alkyl amine of formula (I), a polyoxyethylene alkyl phenyl ether of formula (II) and a polyoxyethylene alkyl ether of formula (III): ##STR1## where R.sup.1 represents a group derived from a chain hydrocarbon with 16 to 19 carbon atoms; m, an integer of 0 through 18; and n, an integer of 0 through 18; where m+n equals 8 through 18; ##STR2## where R.sup.2 represents a group derived from a chain hydrocarbon with 7 to 12 carbon atoms; and x represents an integer of 12 through 20; ##STR3## where R.sup.3 and R.sup.4 each represent a group derived from a chain hydrocarbon with 6 to 8 carbon atoms; and y represents an integer of 10 through 15. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an aqueous ink for ink-jet printing according to the present invention comprises as its main components (i) a water-soluble direct dye and/or acid dye, (ii) a polyhydric alcohol and/or an alkyl ether of a polyhydric alcohol, (iii) water, and (iv) a polyoxyethylene alkyl or alkenyl amine of the following formula (I), which serves as a water-soluble non-ionic surface active agent: ##STR7## where R.
sup.
1 represents a group derived from a chain hydrocarbon with 16 to 19 carbon atoms; m, an integer of 0 through 18; and n, an integer of 0 through 18, where m+n equals 8 through 18.
As mentioned above, in the above general formula (I), R.
sup.
1 is a group derived from a chain hydrocarbon with 16 to 19 carbon atoms, preferably a group derived from an unsaturated chain hydrocarbon, most preferably an oleyl group, a linoleyl group or a linolenyl group.
In the above general formula (I), if the number of carbon atoms and the values of m and n exceed the above-mentioned ranges, the nozzles become plugged if the ink is not used for a long period, and the ink ejection stability and the ink ejection response are significantly degraded.
An appropriate amount of the polyoxyethylene alkyl amine to be added is in the range of 0.
01 wt.
% to 2.
00 wt.
%, preferably in the range of 0.
05 wt.
% to 1.
00 wt.
%.
If the amount is less than 0.
01 wt.
%, adequate results are not obtained, while, if the amount exceeds 2.
00 wt.
%, a plugging tendency will develop in the ink-jet nozzles when the apparatus has not been used for a long period of time, and the ink ejection stability and ink-ejection response will diminish very strikingly.
The surface tension of an aqueous solution of 0.
01 wt.
% of the polyoxyethylene alkyl amine is below 40 dynes/cm (at 25.
degree.
C.
).
However, when one of the above-mentioned dyes is added thereto, the surface tension of the aqueous solution increases to 40 dynes/cm or more at 25.
degree.
C.
As a matter of course, the surface tension of an ink in which the polyoxyethylene alkyl amine and the dye are contained is 40 dynes/cm or more at 25
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