EP0539178A2
Expired / Lapsed
EP
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Waterfast Dye and Aqueous Ink
Assignee: Lexmark International Inc
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Filing: 1992-10-21
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Granted: —
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Expires: 2012-10-21
Abstract
Abstract A dye is described of the structural formula : where R 1 is -H, -C0 2 M , -CH 3 , -OR 3 or CI ; R 2 is C 1-4 alkyl, C 1-4 alkoxy or -CH 2 CO 2 M ; R 3 is C 1-4 alkyl ; R 4 is -NH 2 , -NHR 3 , -NHCH 2 CO 2 H, or (where R 5 is -H, C 1-4 alky or -CO 2 M and R 6 is -H or -NH 2 ) and M is H, NH 4 , Na, K or Li, and wherein the total number of -CO 2 M groups is 1 to 3. The dyes are alkali-soluble and can be used in water-based inks. Printing from the ink is insoluble below pH 6.0, is an intense black at low concentration, and remains black on acid papers. The aqueous inks are stable and exhibit good printhead nozzle maintenance.
Inventors
- 👤 Rodney O. Aulick
- 👤 Bradley L. Beach
- 👤 Donald L. Elbert
- 👤 Terence E. Franey
- 👤 James F. Feeman
- 👤 John M. Olson
- 👤 Allen C. Sanders
- 👤 Robert L. Vollmer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 15:46
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/328; C09B; C09B31/00; C09B31/02; C09B31/08; C09B31/16; C09B31/18
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
A dye of the structural formula: where R 1 is -H, -CO 2 M, -CH 3 , -OR 3 or C1; R 2 is C 1-4 alkyl, C 1-4 alkoxy or -CH 2 CO 2 M; R 3 is C 1-4 alkyl; R 4 is -NH 2 , -NHR 3 , -NHCH 2 CO 2 H, or (where R 5 is -H, C 1-4 alkyl or -CO 2 M and R 6 is -H or -NH 2 ) and M is H, NH 4 , Na, K or Li, and wherein the total number of -C0 2 M groups is 1 to 3.
Claim 2
Dependent Claim
103 words
A dye of the structural formula: where R 1 is -H, -CO 2 M, -CH 3 , -OR 3 or C1; R 2 is C 1-4 alkyl, C 1-4 alkoxy or -CH 2 CO 2 M; R 3 is C 1-4 alkyl; R 4 is -NH 2 , -NHR 3 , -NHCH 2 CO 2 H, or (where R 5 is -H, C 1-4 alkyl or -CO 2 M and R 6 is -H or -NH 2 ) and M is H, NH 4 , Na, K or Li, and wherein the total number of -C0 2 M groups is 1 to 3.
Claim 3
Dependent Claim
9 words
The dye of claim 1 of the structural formula:
Claim 4
Dependent Claim
8 words
The dye of claim 1 of structural formula:
Claim 5
Dependent Claim
8 words
The dye of claim 1 of structural formula:
Claim 6
Dependent Claim
8 words
The dye of claim 1 of structural formula:
Claim 7
Dependent Claim
8 words
The dye of claim 1 of structural formula:
Claim 8
Dependent Claim
8 words
The dye of claim 1 of structural formula:
Claim 9
Dependent Claim
14 words
A dye according to any preceding claim in which M is NH 4 .
Claim 10
Dependent Claim
22 words
A waterfast ink comprising a dye of any of claims 1 to 7 dissolved in a polar vehicle as the ammonium salt.
Claim 11
Dependent Claim
50 words
A waterfast ink comprising by weight: (a) at least 1 % of a dye according to any of claims 1 to 8, (b) at least 2% of a cosolvent, and (c) water and ammonium ion bringing said ink to an alkaline pH sufficient to dissolve said dye in said ink.
Claim 12
Dependent Claim
19 words
An ink according to claim 9 or claim 10 in which the dye has one of the following formulae:
Claim 13
Dependent Claim
26 words
An ink according to claim 9 or claim 10 in which the dye is the compound as defined in claim 5 in which M is NH4.
Claim 14
Dependent Claim
16 words
An ink according to any of claims 9 to 12 which includes 2-pyrrolidone as a cosolvent.
Claim 15
Dependent Claim
22 words
An ink according to any of claims 9 to 13 in which said dye is about 2% by weight of said ink.
Claim 16
Dependent Claim
16 words
An ink according to any of claims 9 to 14 having a pH of about 8.6.
Claim 17
Dependent Claim
18 words
An ink according to any of claims 9 to 15 which contains about 5% by weight of 2-pyrrolidone.
References Cited (Backward Citations)
No citation records indexed.
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