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US5221335A
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Stabilized pigmented hot melt ink containing nitrogen-modified acrylate polymer as dispersion-stabilizer agent
Assignee: Coates Electrographics Ltd
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Filing: 1991-06-21
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Granted: 1993-06-22
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Expires: 2011-06-21
Abstract
Abstract In the embodiments described in the specification, a stabilized, pigmented hot melt ink contains a thermoplastic vehicle, a coloring pigment, and a dispersion-stabilizing agent to inhibit settling or agglomeration of the pigment when the ink is molten comprising 1.5 to 20 weight percent of a nitrogen-modified acrylate polymer. A preferred dispersion-stabilizing agent is the nitrogen-modified methacrylate polymer marketed by Rohm and Haas as Plexol 1525.
Inventors
- 👤 Kevin G. Williams
- 👤 John P. N. Haxell
- 👤 Derek E. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:37
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
42 words
A hot melt ink comprising a thermoplastic solid ink composition having a melting point above 40° C. containing a relatively low-polarity thermoplastic ink vehicle, a pigment, and a nitrogen-modified acrylate polymer dispersion-stabilizing agent which is compatible with the relatively low-polarity ink vehicle.
Claim 2
Dependent Claim
42 words
A hot melt ink comprising a thermoplastic solid ink composition having a melting point above 40° C. containing a relatively low-polarity thermoplastic ink vehicle, a pigment, and a nitrogen-modified acrylate polymer dispersion-stabilizing agent which is compatible with the relatively low-polarity ink vehicle.
Claim 3
Dependent Claim
26 words
A hot melt ink according to claim 1 wherein the dispersion-stabilizing agent is present in an amount of from about 1.5 to about 20 weight percent.
Claim 4
Dependent Claim
26 words
A hot melt ink according to claim 1 wherein the dispersion-stabilizing agent is present in an amount of from about 2 to about 10 weight percent.
Claim 5
Dependent Claim
25 words
A hot melt ink according to claim 1 wherein the pigment is present in an amount of from about 2 to about 10 weight percent.
Claim 6
Dependent Claim
17 words
A hot melt ink according to claim 1 wherein the nitrogen-modified acrylate is a nitrogen-modified methacrylate polymer.
Claim 7
Dependent Claim
60 words
A hot melt ink comprising a thermoplastic solid ink composition having a melting point above about 40° C. containing a relatively low-polarity thermoplastic ink vehicle, a pigment in an amount of from about 2 to about 10 weight percent, and a dispersion-stabilizing agent comprising a nitrogen-modified methacrylate polymer in an amount of from about 2 to about 10 weight percent.
Claim 8
Dependent Claim
60 words
A hot melt ink comprising a thermoplastic solid ink composition having a melting point above about 40° C. containing a relatively low-polarity thermoplastic ink vehicle, a pigment in an amount of from about 2 to about 10 weight percent, and a dispersion-stabilizing agent comprising a nitrogen-modified methacrylate polymer in an amount of from about 2 to about 10 weight percent.
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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) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |