US5120359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erasable ink compositions
Assignee: Sakura Color Products Corp
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Filing: 1989-02-22
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Granted: 1992-06-09
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Expires: 2009-02-22
Abstract
Abstract The present invention provides: (1) an ink composition erasable with a rubber eraser, the composition comprising 1 to 50% of a pigment, 3 to 50% of a resin having a film-forming temperature of 40° C. or higher, 0.5 to 50% of an organic solvent and 7 to 60% of water, based on the weight of the ink composition; (2) an ink composition erasable with a rubber eraser, the composition comprising 2 to 90% of a pigment coated with a resin having a film-forming temperature of 40° C. or higher, 0.5 to 30% of an organic solvent and 0.5 to 30% of water, based on the weight of the ink composition; and (3) an ink composition erasable with a rubber eraser, the composition comprising 2 to 90% of a pigment coated with a resin having a film-forming temperature of 40° C. or higher, 1.5 to 55% of an emulsion (calculated as solids), 0.5 to 30% of an organic solvent and 4.0 to 60% of water, based on the weight of the ink composition.
Inventors
- 👤 Shingo Uzukawa
- 👤 Yukito Shoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:13
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09B; C09B67/00; C09B67/0001; C09B67/0004
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
73 words
An ink composition erasable with a rubber eraser after writing, the composition comprising, based on the weight of the ink composition, 1 to 50% of a pigment, 3 to 50% of a water insoluble resin having a film-forming temperature of 40° C. or higher, 0.5 to 50% of at least one organic solvent selected from the group consisting of alkylene glycols, dialkylene glycols, polyalkylene glycols and glycerins, and 7 to 60% of water.
Claim 2
Dependent Claim
73 words
An ink composition erasable with a rubber eraser after writing, the composition comprising, based on the weight of the ink composition, 1 to 50% of a pigment, 3 to 50% of a water insoluble resin having a film-forming temperature of 40° C. or higher, 0.5 to 50% of at least one organic solvent selected from the group consisting of alkylene glycols, dialkylene glycols, polyalkylene glycols and glycerins, and 7 to 60% of water.
Claim 3
Dependent Claim
34 words
An ink composition according to claim 1 wherein the resin is at least one of acrylic resins, acryl-styrene copolymer resins, ethylene-vinyl acetate-vinyl chloride copolymer resins, acryl-vinyl acetate resins, carboxylated butadiene-styrene rubber and styrene resins.
Claim 4
Dependent Claim
19 words
An ink composition according to claim 1 wherein the resin has a film-forming temperature of 50° C. or higher.
Claim 5
Dependent Claim
43 words
An ink composition according to claim 1 wherein the pigment accounts for 5 to 30%, the resin for 10 to 45%, the organic solvent for 10 to 30% and the water for 7 to 60% in the whole weight of the ink composition.
Claim 6
Dependent Claim
71 words
An ink composition erasable with a rubber eraser after writing, the composition comprising, based on the weight of the ink composition, 2 to 90% of a pigment coated with a water insoluble resin having a film-forming temperature of 40° C. or higher, 0.5 to 30% of at least one organic solvent selected from the group consisting of alkylene glycols, dialkylene glycols, polyalkylene glycols and glycerins, and 0.5 to 30% of water.
Claim 7
Dependent Claim
71 words
An ink composition erasable with a rubber eraser after writing, the composition comprising, based on the weight of the ink composition, 2 to 90% of a pigment coated with a water insoluble resin having a film-forming temperature of 40° C. or higher, 0.5 to 30% of at least one organic solvent selected from the group consisting of alkylene glycols, dialkylene glycols, polyalkylene glycols and glycerins, and 0.5 to 30% of water.
Claim 8
Dependent Claim
34 words
An ink composition according to claim 5 wherein the resin is at least one of acrylic resins, acryl-styrene copolymer resins, ethylene-vinyl acetate-vinyl chloride copolymer resins, acryl-vinyl acetate resins, carboxylated butadiene-styrene rubber and styrene resins.
Claim 9
Dependent Claim
24 words
An ink composition according to claim 5 wherein the resin used for coating the pigment has a film-forming temperature of 50° C. or higher.
Claim 10
Dependent Claim
35 words
An ink composition according to claim 5 wherein the pigment and the resin are present in a ratio of 40-95 : 60-5 of the former to the latter in 100 parts of the resin-coated pigment.
Claim 11
Dependent Claim
23 words
An ink composition according to claim 5 wherein the particles of resin-coated pigment have a mean particle size of 0.1 to 10 μm.
Claim 12
Dependent Claim
38 words
An ink composition according to claim 5 wherein the resin-coated pigment accounts for 10 to 70%, the organic solvent for 1 to 20% and the water for 0.5 to 30% in the whole weight of the ink composition.
Claim 13
Dependent Claim
81 words
An ink composition erasable with a rubber eraser after writing, the composition comprising, based on the weight of the ink composition, 2 to 90% of a pigment coated with a water insoluble resin having a film-forming temperature of 40° C. or higher, 1.5 to 55% of water insoluble emulsion (calculated as solids), 0.5 to 30% of at least one organic solvent selected from the group consisting of alkylene glycols, dialkylene glycols, polyalkylene glycols and glycerins, and 4.0 to 60% of water.
Claim 14
Dependent Claim
81 words
An ink composition erasable with a rubber eraser after writing, the composition comprising, based on the weight of the ink composition, 2 to 90% of a pigment coated with a water insoluble resin having a film-forming temperature of 40° C. or higher, 1.5 to 55% of water insoluble emulsion (calculated as solids), 0.5 to 30% of at least one organic solvent selected from the group consisting of alkylene glycols, dialkylene glycols, polyalkylene glycols and glycerins, and 4.0 to 60% of water.
Claim 15
Dependent Claim
34 words
An ink composition according to claim 11 wherein the resin is at least one of acrylic resins, acryl-styrene copolymer resins, ethylene-vinyl acetate-vinyl chloride copolymer resins, acryl-vinyl acetate resins, carboxylated butadiene-styrene rubber and styrene resins.
Claim 16
Dependent Claim
35 words
An ink composition according to claim 11 wherein the pigment and the resin are present in a ratio of 40-95 : 60-5 of the former to the latter in 100 parts of the resin-coated pigment.
Claim 17
Dependent Claim
23 words
An ink composition according to claim 11 wherein the particles of resin-coated pigment have a mean particle size of 0.1 to 10 μm.
Claim 18
Dependent Claim
39 words
An ink composition according to claim 11 wherein the resin-coated pigment accounts for 10 to 70%, the emulsion for 2 to 50% (calculated as solids), the organic solvent for 0.5 to 30% and the water for 4 to 60%.
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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) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |