Ink for ink jet recording comprising print density improver, print density improver and method for improving print density
AssigneeFUJIFILM Corporation
InventorsTomohiro Chino, Takashi Ozawa
Life of this patent
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Abstract
An aqueous ink for ink jet recording, which comprises: at least one dye; and at least one of a compound having at least one phosphonic acid group and at least one carboxyl group and a compound having at least two phosphonic acid groups as a print density improver(s), a print density improver, and a method for enhancing print density involving the use of the aforementioned print density improver.
Claims9
An aqueous ink for ink jet recording, which comprises:
- at least one dye;
- and
- at least one of a compound having at least one phosphonic acid group and at least one carboxyl group and a compound having at least two phosphonic acid groups as a print density improver(s),
- wherein the at least one of a compound having at least one phosphonic acid group and at least one carboxyl group and a compound having at least two phosphonic acid groups is a compound represented by formula (1):
- Ym-Z-(PO3X2)n (1)
- wherein Z represents a connecting group which may be substituted;
- Y represents —CO2X, —SO3X or other anionic hydrophilic substituent;
- X represents lithium;
- m represents an integer of 0 or more;
- and
- n represents an integer of 1 or more when m is 1 or more and Y contains —SO3X, and n represents an integer of 2 or more when m is 0 or when m is 1 or more but Y is free of —SO3X, with the proviso that when there are a plurality of Y's, they may be the same or different.
A print density improver for an ink for ink jet recording, which comprises at least one of a compound having at least one phosphonic acid group and at least one carboxyl group and a compound having at least two phosphonic acid groups,
- wherein the at least one of a compound having at least one phosphonic acid group and at least one carboxyl group and the compound having at least two phosphonic acid groups is a compound represented by formula (1):
- Ym-Z-(PO3X2)n (1)
- wherein Z represents a connecting group which may be substituted;
- Y represents —CO2X, —SO3X or other anionic hydrophilic substituent;
- X represents lithium;
- m represents an integer of 0 or more;
- and
- n represents an integer of 1 or more when m is 1 or more and Y contains —SO3X, and n represents an integer of 2 or more when m is 0 or when m is 1 or more but Y is free of —SO3X, with the proviso that when there are a plurality of Y's, they may be the same or different.
Dependencies are inferred from the claim text.