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US5871572A
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Aqueous ink composition for use in an ink jet printer
Assignee: Seiko Epson Corp
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Filing: 1997-10-27
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Granted: 1999-02-16
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Expires: 2017-10-27
Abstract
Abstract An aqueous ink composition for ink jet printers, which gives reliable printing performance and yields printed images which have excellent print quality and which dry rapidly is disclosed. The ink compositions are suitable for printing on plain paper. The ink comprises water as the principal solvent, an anionic colorant, pectic acid, a base, and at least one of a penetrable solvent and/or a penetrability-imparting surfactant. The pectic acid is composed primarily of alpha -1,4 linked polygalacturonic acid having a degree of esterification not more than 5% where the degree of esterification is defined as the percentage of the total number of galacturonic acid units in the pectic acid which are esterified.
Inventors
- 👤 William Alan Marritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:10
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
14 words
An ink composition comprising: a colorant; water; a water-soluble organic solvent; and pectic acid.
Claim 2
Dependent Claim
14 words
An ink composition comprising: a colorant; water; a water-soluble organic solvent; and pectic acid.
Claim 3
Dependent Claim
50 words
The ink composition of claim 1, wherein the pectic acid comprises primarily α-1,4 linked polygalacturonic acid having a degree of esterification not more than 5%, where the degree of esterification is defined as the percentage of the total number of galacturonic acid units in the pectic acid which are esterified.
Claim 4
Dependent Claim
15 words
The ink composition of claim 2, wherein the degree of esterification is less than 3%.
Claim 5
Dependent Claim
27 words
The ink composition of claim 1, wherein the molecular weight of pectic acid is greater than or equal to 3,500 and less than or equal to 30,000.
Claim 6
Dependent Claim
13 words
The ink composition of claim 1, wherein the colorant is an anionic colorant.
Claim 7
Dependent Claim
20 words
The ink composition of claim 5, wherein the anionic colorant is a soluble anionic colorant or a dispersed anionic colorant.
Claim 8
Dependent Claim
15 words
The ink composition of claim 1, further comprising a penetrable solvent and/or a penetrability-imparting surfactant.
Claim 9
Dependent Claim
19 words
The ink composition of claim 7, wherein the penetrable solvent is a lower alkyl ether of a polyhydric alcohol.
Claim 10
Dependent Claim
18 words
The ink composition of claim 8, wherein the penetrability-imparting surfactant is an anionic surfactant or a nonionic surfactant.
Claim 11
Dependent Claim
24 words
The ink composition of claim 1, further comprising a base in an amount sufficient to effect dissolution of the pectic acid in the ink.
Claim 12
Dependent Claim
21 words
The ink composition of claim 10, wherein the base is an organic amine, a quaternary organic ammonium hydroxide, or lithium hydroxide.
Claim 13
Dependent Claim
28 words
A recording method comprising the step of depositing ink composition onto a recording medium to conduct printing, wherein said ink composition comprises the ink composition of claim 1.
Claim 14
Dependent Claim
34 words
An ink jet recording method comprising the step of ejecting and depositing droplets of an ink composition onto recording medium to conduct printing, wherein said ink composition comprises the ink composition of claim 1.
Claim 15
Dependent Claim
10 words
A record produced by the recording method of claim 12.
References Cited (Backward Citations)
US5133803A
Cited
US5476540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-15 | 2002-08-17 | 2003-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-15 | 2006-08-17 | 2007-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-15 | 2010-08-17 | 2011-02-16 | $7700.00 | Window Closed / Lapsed |