Patent US4596846A successfully refreshed from Google Patents.
US4596846A
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Mechanically erasable printing liquid
Assignee: Pelikan International Corp Bhd
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Filing: 1983-08-16
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Granted: 1986-06-24
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Expires: 2003-08-16
Abstract
Abstract A printing ink for capillary or jet printers adapted to form a mechanically erasable image, comprises a latex-based aqueous polymer dispersion including a water-soluble or organic-solvent soluble dyestuff coloring the particles of the dispersion without the use of additional solvent.
Inventors
- 👤 Karl-Heinz Bohne
- 👤 Hans-Jurgen Rahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:03
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
A printing ink for producing mechanically erasable images, consisting essentially of: an aqueous latex-based binder dispersion of at least one polymer selected from the group consisting of noncarboxylated styrene-butadiene, 2-chlorobutadiene and vinylpyridine-styrene-butadiene; a water insoluble or organic-solvent soluble dyestuff coloring polymer particles thereof and selected from the group consisting of CI 61,500, CI 61,551 and CI 42770:1; at least one solubility promoter selected from the group consisting of N-methylurea, thiourea, 2-hydroxy-ethylurea, formamide, acetamide and dimethylsulfoxide; and at least one moisture-retentive compound selected from the group consisting of glycerine, 1,2,4-butanetriol and sorbitol.
Claim 2
Dependent Claim
91 words
A printing ink for producing mechanically erasable images, consisting essentially of: an aqueous latex-based binder dispersion of at least one polymer selected from the group consisting of noncarboxylated styrene-butadiene, 2-chlorobutadiene and vinylpyridine-styrene-butadiene; a water insoluble or organic-solvent soluble dyestuff coloring polymer particles thereof and selected from the group consisting of CI 61,500, CI 61,551 and CI 42770:1; at least one solubility promoter selected from the group consisting of N-methylurea, thiourea, 2-hydroxy-ethylurea, formamide, acetamide and dimethylsulfoxide; and at least one moisture-retentive compound selected from the group consisting of glycerine, 1,2,4-butanetriol and sorbitol.
Claim 3
Dependent Claim
18 words
The printing ink defined in claim 1 wherein said dispersion further includes at least one phthalic acid ester.
Claim 4
Dependent Claim
14 words
The printing ink defined in claim 2 wherein said phthalic acid ester is di-isobutylphthalate.
Claim 5
Dependent Claim
15 words
The printing ink defined in claim 1 wherein said dispersion further includes acetyltributylcitrate as plasticizer.
References Cited (Backward Citations)
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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) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |