US5547802A
Expired / Lapsed
US
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Image formation materials and image fading prevention method
Assignee: Ricoh Co Ltd
•
Filing: 1994-10-31
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Granted: 1996-08-20
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Expires: 2014-10-31
Abstract
Abstract An image formation material for forming images including color images, such as a toner or developer for use in image formation methods such as electrophotography, electrostatic recording, and in an ink jet printing, includes a binder resin, a dye, and a quencher for preventing the deterioration of the dye; and a method of preventing the fading of images formed by the above image formation methods can be carried out by use of this image formation material.
Inventors
- 👤 Hiromitsu Kawase
- 👤 Yoshikazu Kaneko
- 👤 Shoji Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:34
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/0912; G03G9/097; G03G9/09783
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
An image formation material comprising a binder resin, a dye, and a singlet oxygen.
Claim 2
Dependent Claim
14 words
An image formation material comprising a binder resin, a dye, and a singlet oxygen.
Claim 3
Dependent Claim
170 words
The image formation material as claimed in claim 1, wherein said quencher is selected from the group consisting of compounds of formulae (I) to (IV): ##STR53## wherein R 1 and R 2 each is independently an alkyl group having 1 to 18 carbon atoms, phenyl group, benzyl group or an aryl group; M 1 is a bivalent or trivalent metal; n is an integer of 2 or 3; R 3 , R 4 , R 5 , and R 6 each is independently cyano group, phenyl group, or a phenyl group substituted with an alkyl group, an alkoxyl group, or a halogen atom; X, Y and Z each is independently an alkyl group having 1 to 4 carbon atoms, a halogen atom, a hydrogen atom, or an alkoxyl group; R 7 , R 8 , R 9 , and R 10 each is an alkyl group having 1 to 18 carbon atoms; and M 2 , M 3 and M 4 each is independently nickel, copper, cobalt, palladium or vanadium.
Claim 4
Dependent Claim
19 words
The image formation material as claimed in claim 2, wherein each of M 1 to M 4 is nickel.
Claim 5
Dependent Claim
31 words
An image fading prevention method comprising the step of coating a quencher on the surface of images formed by an image formation material which comprises a binder resin and a dye.
Claim 6
Dependent Claim
31 words
An image fading prevention method comprising the step of coating a quencher on the surface of images formed by an image formation material which comprises a binder resin and a dye.
Claim 7
Dependent Claim
171 words
The image fading prevention method as claimed in claim 4, wherein said quencher is selected from the group consisting of compounds of formulae (I) to (IV): ##STR54## wherein R 1 and R 2 each is independently an alkyl group having 1 to 18 carbon atoms, phenyl group, benzyl group or an aryl group M 1 is a bivalent or trivalent metal; n is an integer of 2 or 3; R 3 , R 4 , R 5 , and R 6 each is independently cyano group, phenyl group, or a phenyl group substituted with an alkyl group, an alkoxyl group, or a halogen atom; X, Y and Z each is independently an alkyl group having 1 to 4 carbon atoms, a halogen atom, a hydrogen atom, or an alkoxyl group; R 7 , R 8 , R 9 , and R 10 each is an alkyl group having 1 to 18 carbon atoms; and M 2 , M 3 and M 4 each is independently nickel, copper, cobalt, palladium or vanadium.
Claim 8
Dependent Claim
62 words
The image fading prevention method as claimed in claim 4, wherein said quencher is a compound of formula ##STR55## wherein M 5 is selected from the group consisting of nickel, copper, cobalt, palladium and vanadium; and R 11 and R 12 each is independently a lower alkyl group or --C(R 13 ) 3 , in which R 13 is a halogen atom.
Claim 9
Dependent Claim
20 words
The image fading prevention method as claimed in claim 5, wherein each of M 1 to M 4 is nickel.
Claim 10
Dependent Claim
15 words
The image fading prevention method as claimed in claim 6, wherein M 5 is nickel.
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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) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |