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US 5,514,208 AGranted
Aqueous ink and method for recording image with the aqueous ink
AssigneeRicoh Company, Ltd.
InventorsKiyofumi Nagai, Akiko Konishi, Tetsuya Kaneko
Life of this patent
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Abstract
This invention provides an aqueous ink composition, in which the composition satisfies several requirements for properties of an ink for ink-jet printing, has a superior tone for magenta color and has an improved waterfastness. The aqueous ink composition comprises a dye, water and a huemectant, the dye comprising a dye of a general formula (I): ##STR1##
Claims9
An aqueous ink composition comprising a dye, water and a huemectant, wherein said dye comprises a dye of the general formula (I):
- ##STR12## wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are selected from the group consisting of a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms and a halogen atom;
- and X.sub.1 and X.sub.2 are selected from the group consisting of the general formula (IIa) and (IIb):
- ##STR13## wherein M is selected from the group consisting of an alkali metal, quaternary ammonium, quaternary phosphonium and alkanol amine having from 1 to 4 carbon atoms;
- a is an integer varying from 0 to 6, b is an integer varying from 1 to 2;
- 1 and m are integers having a value of 0 or 1 while 1 and m are not simultaneously equal to 1;
- and Y is selected from the group consisting of --SO.sub.3.sup.- and --COO.sup.-.
3 more elements
A method for recording an image comprising the steps of:
- ejecting a small droplet of an ink composition by applying a thermal energy or mechanical energy to the ink composition;
- and
- adhering said droplet to an agent to which the image is to be recorded, wherein said agent has a Stockigt sizing degree of equal to or more than 3 seconds, and wherein said ink composition comprises a dye, water and a huemectant, said dye comprising a dye of a general formula (I):
- ##STR19## wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are selected from the group consisting of a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms and a halogen atom;
- X.sub.1 and X.sub.2 are selected from the group consisting of the general formula (IIa) and (IIb):
- ##STR20## wherein M is selected from the group consisting of an alkali metal, quaternary ammonium, quaternary phosphonium and alkanol amine having from 1 to 4 carbon atoms;
- a is an integer varying from 0 to 6 and b is an integer varying from 1 to 2;
- 1 and m are integers having a value of 0 or 1 while 1 and m are not simultaneously equal to 1;
- and Y is selected from the group consisting of --SO.sub.3.sup.- and --COO.sup.-.
6 more elements
Dependencies are inferred from the claim text.