US5488402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for preventing color bleed in a multi-ink printing system
Assignee: HP Inc
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Filing: 1995-03-10
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Granted: 1996-01-30
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Expires: 2015-03-10
Abstract
Abstract A method for controlling color bleed in multi-color thermal inkjet printing systems. Color bleed involves the migration of coloring agents between adjacent zones in a multi-color printed image on a substrate. To control color bleed between any two ink compositions in a multi-ink system, at least one of the ink compositions will contain a precipitating agent (e.g. a multi-valent metal salt). The precipitating agent is designed to react with the coloring agent in the other ink composition of concern. As a result, when the two ink compositions come in contact, a precipitate is formed from the coloring agent in the other ink composition which prevents migration thereof and color bleed problems. This technique is applicable to printing systems containing two or more ink compositions, and enables distinct multi-color images to be produced without the problems normally caused by color bleed.
Inventors
- 👤 James P. Shields
- 👤 Garold E. Radke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:03
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/40; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175; B41J2/21; B41J2/2107
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
An inkjet ink set for use in printing multi-colored images while controlling color bleed between adjacent printed regions comprising: a first ink composition, said first ink composition comprising a first coloring agent; and a second ink composition, said second ink composition comprising a second coloring agent and a precipitating agent which will react with said first coloring agent in said first ink composition in order to form a precipitate therefrom.
Claim 2
Dependent Claim
70 words
An inkjet ink set for use in printing multi-colored images while controlling color bleed between adjacent printed regions comprising: a first ink composition, said first ink composition comprising a first coloring agent; and a second ink composition, said second ink composition comprising a second coloring agent and a precipitating agent which will react with said first coloring agent in said first ink composition in order to form a precipitate therefrom.
Claim 3
Dependent Claim
16 words
The inkjet ink set of claim 1 wherein said precipitating agent comprises a multi-valent metal salt.
Claim 4
Dependent Claim
51 words
The inkjet ink set of claim 2 wherein said multi-valent metal salt comprises a multi-valent metal cation selected from the group consisting of Ca +2 , Cu +2 , Co +2 , Ni +2 , Fe +2 , La +3 , Nd +3 , Y +3 , and Al +3 .
Claim 5
Dependent Claim
72 words
The inkier ink set of claim 2 wherein said multi-valent metal salt is selected from the group consisting of Ca(NO 3 ) 2 , CaCl 2 , Ca(CH 3 COO) 2 , Al(NO 3 ) 3 , Nd(NO 3 ) 3 , Y(NO 3 ) 3 , Cu(NO 3 ) 2 , CuCl 2 , CoCl 2 , Co(NO 3 ) 2 , NiCl 2 , and Ni(NO 3 ) 2 .
Claim 6
Dependent Claim
44 words
The inkjet ink set of claim 2 wherein said first ink composition comprises about 2-7% by weight said first coloring agent, and said second ink composition comprises about 2-7% by weight said second coloring agent and about 1-15% by weight said multi-valent metal salt.
Claim 7
Dependent Claim
19 words
The inkier ink set of claim 1 wherein said first coloring agent is darker than said second coloring agent.
Claim 8
Dependent Claim
14 words
The inkier ink set of claim 1 wherein said first coloring agent is black.
Claim 9
Dependent Claim
138 words
An inkjet ink set for use in printing multi-colored images while controlling color bleed between adjacent printed regions comprising: a first ink composition, said first ink composition comprising about 2-7% by weight of a first coloring agent; and a second ink composition, said second ink composition comprising about 2-7% by weight of a second coloring agent and about 1-15% by weight of a precipitating agent, said precipitating agent comprising at least one multi-valent metal salt which will react with said first coloring agent in said first ink composition in order to form a precipitate therefrom, said multi-valent metal salt comprising a multi-valent metal cation selected from the group consisting of Ca 2 , Cu +2 , Co +2 , Ni +2 , Fe +2 , La +3 , Nd +3 , Y +3 , and Al +3 .
Claim 10
Dependent Claim
138 words
An inkjet ink set for use in printing multi-colored images while controlling color bleed between adjacent printed regions comprising: a first ink composition, said first ink composition comprising about 2-7% by weight of a first coloring agent; and a second ink composition, said second ink composition comprising about 2-7% by weight of a second coloring agent and about 1-15% by weight of a precipitating agent, said precipitating agent comprising at least one multi-valent metal salt which will react with said first coloring agent in said first ink composition in order to form a precipitate therefrom, said multi-valent metal salt comprising a multi-valent metal cation selected from the group consisting of Ca 2 , Cu +2 , Co +2 , Ni +2 , Fe +2 , La +3 , Nd +3 , Y +3 , and Al +3 .
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-01-29 | 1999-07-31 | 2000-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-29 | 2003-07-31 | 2004-01-30 | $3760.00 | Window Closed / Lapsed |
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