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EP0780450A2
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Aqueous ink compositions containing amide anti-curl agent
Assignee: EIDP Inc
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Filing: 1996-11-22
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Granted: —
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Expires: 2016-11-22
Abstract
Abstract Aqueous ink compositions containing anti-curl agents substantially reduce or eliminate paper curl in plain-paper printed elements without adversely effecting storage stability, decap properties or print quality, and thus eliminate the need for expensive and bulky mechanical curl-arresting devices or special curl-resistant substrates. Printing the inks on plain-paper substrates is the sole step in a process for reducing paper curl in plain-paper printed elements.
Inventors
- 👤 Gregg A. Lane
- 👤 Keshava Anand Prasad
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 20:47
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
190 words
A process for reducing paper curl in plain-paper printed elements, consisting essentially of applying an ink jet composition to a plain-paper substrate, wherein the ink composition comprises an aqueous carrier medium, a colorant, and at least one anti-curl agent in an amount effective to substantially eliminate curl in said plain paper substrate, wherein the anti-curl agent has a solubility in water of at least 4.5% at 25°C and is selected from the group consisting of: (a) a compound having the formula: wherein R is a linear or branched aliphatic compound having 1, 2, 4 or 5 carbon atoms; (b) a compound having the formula: wherein R 1 R 2 and R 3 are independently H, CH 3 or CH 2 CH 3 ; (c) a compound having the formula: wherein R 1 and R 2 are independently H, CH 3 or CH 2 CH 3 ; and (d) a compound having the formula: wherein R' and R'' independently are H, CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , or with the proviso that R' and R'' together have up to 6 carbon atoms.
Claim 2
Dependent Claim
19 words
The process of claim 1 wherein the colorant is a pigment dispersion comprising a pigment and a polymeric dispersant.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the colorant is a dye.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the anti-curl agent is selected from the structure (a) compounds consisting of acetamide, propionamide, isobutyramide and hexanamide.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the anti-curl agent is selected from the structure (b) compounds consisting of tetrahydro-2-pyrimidone; 3-methyltetrahydro-2-pyrimidone; 4-methyl-tetrahydro-2-pyrimidone; 3-ethyl-tetrahydro-2-pyrimidone; and 4-ethyl-tetrahydro-2-pyrimidone.
Claim 6
Dependent Claim
22 words
The process of claim 1, wherein the anti-curl agent is selected from the structure (c) compounds consisting of 2-imidazolidinone; dimethylimidazolidinone; and diethylimidazolidinone.
Claim 7
Dependent Claim
30 words
The process of claim 1 wherein the anti-curl agent is selected from the structure (d) compounds consisting of butyl urea; 1,3-dimethyl urea; ethyl urea; propyl urea; isopropyl urea; 1,3-diethyl urea.
Claim 8
Dependent Claim
48 words
The process of claim 2 wherein said polymeric dispersant is a block copolymer and wherein the ink composition comprises approximately 0.1 to 8% pigment, 0.1 to 8% block copolymer, and 84 to 99.8% aqueous carrier medium and anti-curl agent, based upon the total weight of the ink composition.
Claim 9
Dependent Claim
30 words
The process of claim 1 comprising approximately 0.01 to 20% dye, and 80 to 99.99% aqueous carrier medium and anti-curl agent, based on the total weight of the ink composition.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the anti-curl agent is present in the amount of 10 to 75% by weight, based on the total weight of ink.
Claim 11
Dependent Claim
190 words
An aqueous ink particularly adapted for printing a plain paper substrate in an ink jet printer, said ink comprising an aqueous carrier medium, a colorant, and an effective amount of at least one anti-curl agent to substantially eliminate curl in the paper substrate; wherein said anti-curl agent comprises 10 to 75% of said ink by weight, has a solubility in water of at least 4.5% at 25°C, and is selected from the group consisting of: (a) a compound having the formula: wherein R is a linear or branched aliphatic compound having 1, 2, 4 or 5 carbon atoms; (b) a compound having the formula: wherein R 1 R 2 and R 3 are independently H, CH 3 or CH 2 CH 3 ; (c) a compound having the formula: wherein R 1 and R 2 are independently H, CH 3 or CH 2 CH 3 ; and (d) a compound having the formula: wherein R' and R'' independently are H, CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , or with the proviso that R' and R'' together have up to 6 carbon atoms.
Claim 12
Dependent Claim
19 words
The ink of claim 11 wherein the colorant is a pigment dispersion comprising a pigment and a polymeric dispersant.
Claim 13
Dependent Claim
11 words
The ink of claim 11 wherein the colorant is a dye.
Claim 14
Dependent Claim
20 words
The ink of claim 12 or 13 wherein said anti-curl agent comprises 12 to 55% of said ink by weight.
Claim 15
Dependent Claim
23 words
The ink of claim 11 wherein the anti-curl agent is selected from the structure (a) compounds consisting of acetamide, propionamide, isobutyramide and hexanamide.
Claim 16
Dependent Claim
24 words
The ink of claim 11 wherein the anti-curl agent is selected from the structure (b) compounds consisting of tetrahydro-2-pyrimidone; 3-methyltetrahydro-2-pyrimidone; 4-methyl-tetrahydro-2-pyrimidone; 3-ethyl-tetrahydro-2-pyrimidone; and 4-ethyl-tetrahydro-2-pyrimidone.
Claim 17
Dependent Claim
22 words
The ink of claim 11, wherein the anti-curl agent is selected from the structure (c) compounds consisting of 2-imidazolidinone; dimethylimidazolidinone; and diethylimidazolidinone.
Claim 18
Dependent Claim
30 words
The ink of claim 11 wherein the anti-curl agent is selected from the structure (d) compounds consisting of butyl urea; 1,3-dimethyl urea; ethyl urea; propyl urea; isopropyl urea; 1,3-diethyl urea.
Claim 19
Dependent Claim
27 words
The ink of claim 11 wherein said ink contains 0.1 to 8% pigment colorant, 0.1 to 8% polymeric dispersant, and 12 to 55% anti-curl agent, by weight.
Claim 20
Dependent Claim
24 words
The ink of claim 11 wherein said ink contains a block polymer and 15 to 30% by weight of at least one anti-curl agent.
Claim 21
Dependent Claim
24 words
The ink of claim 11 wherein said ink contains a dye colorant and 15 to 30% by weight of at least one anti-curl agent.
References Cited (Backward Citations)
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