US6017386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decolorizable ink and printer
Assignee: Toshiba Corp
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Filing: 1999-01-22
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Granted: 2000-01-25
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Expires: 2019-01-22
Abstract
Abstract A decolorizable image forming material comprising a color former, a developer and a decolorizer, the decolorizer comprising a highly amorphous phase separation inhibitor and a slightly amorphous phase separation inhibitor. A cyclic sugar alcohol is used as the highly amorphous phase separation inhibitor, and a non-aromatic cyclic compound having five-membered or larger ring substituted by a hydroxyl group or a derivative of a cyclic sugar alcohol is used as the slightly amorphous phase separation inhibitor. The decolorizable image forming material can be decolored easily after image formation by a solvent and the decolored state of which can be maintained stably, thereby making it possible to reuse paper sheets.
Inventors
- 👤 Kenji Sano
- 👤 Katsuyuki Naito
- 👤 Satoshi Takayama
- 👤 Sawako Fujioka
- 👤 Tetsuo Okuyama
- 👤 Shigeru Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:51
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
30 words
A decolorizable image forming material, comprising: a color former, a developer and a decolorizer, said decolorizer comprising a highly amorphous phase separation inhibitor and a slightly amorphous phase separation inhibitor.
Claim 2
Dependent Claim
30 words
A decolorizable image forming material, comprising: a color former, a developer and a decolorizer, said decolorizer comprising a highly amorphous phase separation inhibitor and a slightly amorphous phase separation inhibitor.
Claim 3
Dependent Claim
51 words
The decolorizable image forming material according to claim 1, wherein said highly amorphous phase separation inhibitor comprises a cyclic sugar alcohol, and said slightly amorphous phase separation inhibitor comprises a non-aromatic cyclic compound having five-membered or larger ring substituted by a hydroxyl group or a derivative of a cyclic sugar alcohol.
Claim 4
Dependent Claim
20 words
The decolorizable image forming material according to claim 1, wherein said slightly amorphous phase separation inhibitor comprises a terpene alcohol.
Claim 5
Dependent Claim
34 words
The decolorizable image forming material according to claim 1, wherein said decolorizer contains a biodegradable sterol compound extracted from an animal, a plant or fungi and a cyclic sugar alcohol or a derivative thereof.
Claim 6
Dependent Claim
23 words
The decolorizable image forming material according to claim 1, wherein said color former, said developer and said decolorizer are dispersed in a binder.
Claim 7
Dependent Claim
31 words
The decolorizable image forming material according to claim 5, wherein said binder is selected from the group consisting of polystyrene, styrene-acrylate copolymer and a blend polymer comprising polystyrene and acrylic resin.
Claim 8
Dependent Claim
35 words
The decolorizable image forming material according to claim 6, wherein said binder comprises polystyrene having an average molecular weight of 1,000 to 200,000, and is contained in an amount of 30 to 90% by weight.
Claim 9
Dependent Claim
35 words
The decolorizable image forming material according to claim 6, wherein said binder comprises polystyrene having an average molecular weight of 200,000 to 600,000, and is contained in an amount of 30 to 80% by weight.
Claim 10
Dependent Claim
35 words
The decolorizable image forming material according to claim 6, wherein said binder comprises polystyrene having an average molecular weight of 600,000 to 1,000,000, and is contained in an amount of 30 to 70% by weight.
Claim 11
Dependent Claim
34 words
The decolorizable image forming material according to claim 6, wherein said binder comprising a styrene-acrylate copolymer or a blend polymer comprising polystyrene and acrylic resin is contained at least 50% by weight of styrene.
Claim 12
Dependent Claim
47 words
The decolorizable image forming material according to claim 6, wherein said binder comprises styrene-acrylate copolymer or a blend polymer comprising polystyrene and acrylic resin, said binder having an average molecular weight of 1,000 to 200,000, and is contained in an amount of 30% to 95% by weight.
Claim 13
Dependent Claim
48 words
The decolorizable image forming material according to claim 6, wherein said binder comprises a styrene-acrylate copolymer or a blend polymer comprising polystyrene and acrylic resin, said binder having an average molecular weight of 200,000 to 400,000, and is contained in an amount of 30% to 85% by weight.
Claim 14
Dependent Claim
48 words
The decolorizable image forming material according to claim 6, wherein said binder comprises a styrene-acrylate copolymer or a blend polymer comprising polystyrene and acrylic resin, said binder having an average molecular weight of 400,000 to 1,000,000, and is contained in an amount of 30% to 75% by weight.
Claim 15
Dependent Claim
23 words
The decolorizable image forming material according to claim 6, wherein said binder is selected from the group consisting of polyester and epoxy resin.
Claim 16
Dependent Claim
38 words
The decolorizable image forming material according to claim 14, wherein said binder comprises polyester or epoxy resin having an average molecular weight of 1,000 to 5,000, and is contained in an amount of 30 to 95% by weight.
Claim 17
Dependent Claim
38 words
The decolorizable image forming material according to claim 14, wherein said binder comprises polyester or epoxy resin having an average molecular weight of 5,000 to 10,000, and is contained in an amount of 30 to 90% by weight.
Claim 18
Dependent Claim
38 words
The decolorizable image forming material according to claim 14, wherein said binder comprises polyester or epoxy resin having an average molecular weight of 10,000 to 20,000, and is contained in an amount of 30 to 87% by weight.
Claim 19
Dependent Claim
38 words
The decolorizable image forming material according to claim 14, wherein said binder comprises polyester or epoxy resin having an average molecular weight of 20,000 to 100,000, and is contained in an amount of 30 to 85% by weight.
Claim 20
Dependent Claim
38 words
The decolorizable image forming material according to claim 14, wherein said binder comprises polyester or epoxy resin having an average molecular weight of 100,000 to 1,000,000, and is contained in an amount of 30 to 80% by weight.
Claim 21
Dependent Claim
14 words
The decolorizable image forming material according to claim 14, further comprising a basic compound.
Claim 22
Dependent Claim
18 words
The decolorizable image forming material according to claim 14, further comprising microcapsules having a basic compound sealed therein.
References Cited (Backward Citations)
US5849651A
Cited
US5922115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-24 | 2003-07-26 | 2004-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-24 | 2007-07-26 | 2008-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-24 | 2011-07-26 | 2012-01-25 | $7700.00 | Window Closed / Lapsed |