Patent US6203603B1 successfully refreshed from Google Patents.
US6203603B1
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Erasable image forming material
Assignee: Toshiba Corp
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Filing: 1999-08-03
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Granted: 2001-03-20
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Expires: 2019-08-03
Abstract
Abstract An erasable image forming material includes a color former, a developer, a binder resin, and a polymer decolorizer having an electron donating group capable of physically or chemically adsorbing the developer. This polymer decolorizer is, e.g., a polymer compound having a sugar skeleton, representatively starch. This image forming material can form sharp images and erase images by heat or a solvent to achieve a good erased state.
Inventors
- 👤 Satoshi Takayama
- 👤 Shigeru Machida
- 👤 Kenji Sano
- 👤 Koichi Tsunemi
- 👤 Shuitsu Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:22
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50; B; B41; B41M; B41M5/00; B41M5/124; B41M5/128; B41M7/00; B41M7/0009; G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0928; B41M5/132
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
31 words
An erasable image forming material comprising a color former, a developer, a matrix agent, and a polymer decolorizer having an electron donating group capable of physically or chemically adsorbing said developer.
Claim 2
Dependent Claim
31 words
An erasable image forming material comprising a color former, a developer, a matrix agent, and a polymer decolorizer having an electron donating group capable of physically or chemically adsorbing said developer.
Claim 3
Dependent Claim
50 words
The material according to claim 1 , wherein said polymer decolorizer is at least one compound selected from the group consisting of a polymer compound having a sugar skeleton, polyamino acid, a polymer compound having a hydroxyl group, a polymer compound having an amino group, polyvinylacetal, polyacrylonitrile, and copolymers thereof.
Claim 4
Dependent Claim
21 words
The material according to claim 1 , wherein an average molecular weight of said polymer decolorizer is not less than 800.
Claim 5
Dependent Claim
21 words
The material according to claim 3 , wherein the average molecular weight of said polymer decolorizer is not less than 10,000.
Claim 6
Dependent Claim
45 words
The material according to claim 2 , wherein said polymer compound having a sugar skeleton is selected from the group consisting of starch, a grain powder containing starch as a main component, a starch derivative, a cellulose derivative, and a polysaccharide and a derivative thereof.
Claim 7
Dependent Claim
91 words
The material according to claim 1 , wherein a compositional ratio of said decolorizer to said developer is within a range, the lower limit of which is determined by a compositional ratio where a reaction ratio between said developer and said decolorizer becomes 70% or more after erasure treatment, and the upper limit of which is determined by a compositional ratio where a reaction ratio between said developer and said decolorizer becomes 30% or less after said two components are mixed at a temperature for preparation of the image forming material.
Claim 8
Dependent Claim
42 words
The material according to claim 1 , wherein contents of said developer and said polymer decolorizer are 0.1 to 10 parts by weight and 1 to 200 parts by weight, respectively, with respect to 1 part by weight of said color former.
Claim 9
Dependent Claim
43 words
The material according to claim 7 , wherein the contents of said developer and said polymer decolorizer are 0.3 to 2 parts by weight and 3 to 50 parts by weight, respectively, with respect to 1 part by weight of said color former.
Claim 10
Dependent Claim
61 words
An erasable image fonning material comprising a color former, a developer, a matrix agent, and a polymer decolorizer, wherein said polymer decolorizer is at least one compound selected from the group consisting of a polymer compound having a sugar skeleton, polyamino acid, a polymer compound having a hydroxyl group, a polymer compound having an amino group, polyvinylacetal, polyacrylonitrile, and copolymers thereof.
Claim 11
Dependent Claim
61 words
An erasable image fonning material comprising a color former, a developer, a matrix agent, and a polymer decolorizer, wherein said polymer decolorizer is at least one compound selected from the group consisting of a polymer compound having a sugar skeleton, polyamino acid, a polymer compound having a hydroxyl group, a polymer compound having an amino group, polyvinylacetal, polyacrylonitrile, and copolymers thereof.
Claim 12
Dependent Claim
21 words
The material according to claim 9 , wherein an average molecular weight of said polymer decolorizer is not less than 800.
Claim 13
Dependent Claim
21 words
The material according to claim 10 , wherein the average molecular weight of said polymer decolorizer is not less than 10,000.
Claim 14
Dependent Claim
45 words
The material according to claim 9 , wherein said polymer compound having a sugar skeleton is selected from the group consisting of starch, a grain powder containing starch as a main component, a starch derivative, a cellulose derivative, and a polysaccharide and a derivative thereof.
Claim 15
Dependent Claim
91 words
The material according to claim 9 , wherein a compositional ratio of said decolorizer to said developer is within a range, the lower limit of which is determined by a compositional ratio where a reaction ratio between said developer and said decolorizer becomes 70% or more after erasure treatment, and the upper limit of which is determined by a compositional ratio where a reaction ratio between said developer and said decolorizer becomes 30% or less after said two components are mixed at a temperature for preparation of the image forming material.
Claim 16
Dependent Claim
42 words
The material according to claim 9 , wherein contents of said developer and said polymer decolorizer are 0.1 to 10 parts by weight and 1 to 200 parts by weight, respectively, with respect to 1 part by weight of said color former.
Claim 17
Dependent Claim
43 words
The material according to claim 14 , wherein the contents of said developer and said polymer decolorizer are 0.3 to 2 parts by weight and 3 to 50 parts by weight, respectively, with respect to 1 part by weight of said color former.
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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) | 2004-03-19 | 2004-09-18 | 2005-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-03-19 | 2008-09-18 | 2009-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-03-19 | 2012-09-18 | 2013-03-20 | $7700.00 | Window Closed / Lapsed |