US5224987A
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US
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Penetrants for aqueous ink jet inks
Assignee: EIDP Inc
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Filing: 1991-11-12
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Granted: 1993-07-06
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Expires: 2011-11-12
Abstract
Abstract Ink compositions for ink jet printers comprise an aqueous carrier medium, pigment dispersion or dye and a selected amide or lactam penetrant having a solubility in water of at least 4.5% at 25° C. and 5-10 carbon atoms exhibit rapid drying, excellent storage stability and have excellent crusting properties.
Inventors
- 👤 Howard Matrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:49
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
123 words
An aqueous ink jet ink composition comprising: (a) an aqueous carrier medium, present in a major amount; (b) a colorant; and (c) a penetrant having a solubility in water of at least 4.5% at 25° C., and which is selected from the group consisting of: 1) Unsubstituted or acyclic alkyl substituted amides having the general structure: ##STR7## wherein a+b+c=4-9, and a, b and c are 0 or a whole integer; 2) Unsubstituted and N-alkyl lactams having the general structure: ##STR8## wherein a+b=4-6, b is 0 or a whole integer, and a is a whole integer; and ) Amides substituted by one cycloalkyl group having the general structure: ##STR9## wherein x, y or z=0 or 1, q, r or s=-1 or 1, and a+b+c=5-9.
Claim 2
Dependent Claim
123 words
An aqueous ink jet ink composition comprising: (a) an aqueous carrier medium, present in a major amount; (b) a colorant; and (c) a penetrant having a solubility in water of at least 4.5% at 25° C., and which is selected from the group consisting of: 1) Unsubstituted or acyclic alkyl substituted amides having the general structure: ##STR7## wherein a+b+c=4-9, and a, b and c are 0 or a whole integer; 2) Unsubstituted and N-alkyl lactams having the general structure: ##STR8## wherein a+b=4-6, b is 0 or a whole integer, and a is a whole integer; and ) Amides substituted by one cycloalkyl group having the general structure: ##STR9## wherein x, y or z=0 or 1, q, r or s=-1 or 1, and a+b+c=5-9.
Claim 3
Dependent Claim
19 words
The ink composition of claim 1, wherein said colorant is a pigment dispersion comprising a pigment and a dispersant.
Claim 4
Dependent Claim
13 words
The ink composition of claim 2 wherein the dispersant is a polymeric dispersant.
Claim 5
Dependent Claim
19 words
The ink composition of claim 1, wherein the penetrant is an amide compound represented by structure and wherein a+b+c=4-8.
Claim 6
Dependent Claim
9 words
The ink composition of claim 4, wherein a+b +c=4-6.
Claim 7
Dependent Claim
8 words
The ink composition of claim 4, wherein a=0-4.
Claim 8
Dependent Claim
34 words
The ink composition of claim 4, wherein the amide compound is selected from the group consisting of N,N-di-isopropylformamide, N,N-di-isopropylacetamide, N,N-di-n-propylacetamide, an N-butylformamide isomer, an N-butylacetamide isomer, an N-butylpropanamide isomer, N,N-diethylpropanamide, N,N-diethylbutanamide, N,N-dimethylpentanamide, and pentanamide.
Claim 9
Dependent Claim
12 words
The ink composition of claim 7, wherein the N-butylacetamide isomer is N-n-butylacetamide.
Claim 10
Dependent Claim
21 words
The ink composition of claim 7, wherein the N-butylpropanamide isomer is selected from the group consisting of N-isobutylpropanamide, N-n-butylpropanamide, and N-sec-butylpropanamide.
Claim 11
Dependent Claim
20 words
The ink composition of claim 1, wherein the penetrant is a lactam compound represented by structure 2) and wherein a+b=4-6.
Claim 12
Dependent Claim
8 words
The ink composition of claim 10, wherein a+b=4-5.
Claim 13
Dependent Claim
25 words
The ink composition of claim 10, wherein the lactam compound is selected from the group consisting of a substituted 2-pyrrolidone, a substituted 2-valerolactam, and oenthalolactam.
Claim 14
Dependent Claim
12 words
The ink composition of claim 12, wherein the substituted 2-pyrrolidone is N-n-butyl-2-pyrrolidone.
Claim 15
Dependent Claim
20 words
The ink composition of claim 1, wherein the penetrant is an amide compound represented by structure 3), and wherein a+b+c=6-9.
Claim 16
Dependent Claim
9 words
The ink composition of claim 14, wherein a+b c=6-7.
Claim 17
Dependent Claim
10 words
The ink composition of claim 14, wherein a times x=0-4.
Claim 18
Dependent Claim
13 words
The ink composition of claim 14, wherein the amide contains a cyclopentyl group.
Claim 19
Dependent Claim
13 words
The ink composition of claim 14, wherein the amide contains a cyclohexyl group.
Claim 20
Dependent Claim
12 words
The ink composition of claim 18, wherein the amide compound is N-cyclohexylformamide.
Claim 21
Dependent Claim
22 words
The ink composition of claim 2, wherein the pigment comprises particles having a median particle size of approximately 0.01 to 0.3 micron.
Claim 22
Dependent Claim
48 words
The ink composition of claim 3, wherein said polymeric dispersant comprises a block copolymer and wherein the ink composition comprises approximately 0.1 to 8% pigment, 0.1 to 8% block copolymer, and 94 to 99.8% aqueous carrier medium plus penetrant, based upon the total weight of the ink composition.
Claim 23
Dependent Claim
21 words
The ink composition of claim 1, wherein the aqueous carrier medium comprises water and at least one water soluble organic solvent.
Claim 24
Dependent Claim
28 words
The ink composition of claim 22, wherein aqueous carrier medium comprises from 30% to 95% water based on the total weight of the aqueous carrier medium plus penetrant.
Claim 25
Dependent Claim
41 words
The ink composition of claim 1, wherein said colorant is a dye and wherein said ink composition comprises approximately 0.2 to 20% dye, and 80 to 99.8% aqueous carrier medium plus penetrant, based on the total weight of the ink composition.
Claim 26
Dependent Claim
30 words
The ink composition of claim 1, wherein the aqueous carrier medium is a mixture of water and at least one water soluble organic solvent having at least 2 hydroxyl groups.
Claim 27
Dependent Claim
32 words
The ink composition of claim 1, wherein said ink composition has a surface tension of approximately 30 to 70 dyne/cm and a viscosity of no greater than 20 cP at 20° C.
Claim 28
Dependent Claim
11 words
The ink composition of claim 1, wherein a surfactant is present.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |