US4372582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizer for electron doner-acceptor carbonless copying systems
Assignee: 3M Co
•
Filing: 1981-03-30
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Granted: 1983-02-08
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Expires: 2001-03-30
Abstract
Abstract A stabilizing agent for use in electron donor-acceptor carbonless copying systems. The stabilizing agent is 2,2'-methylene-bis(4-methyl-6-t-butyl phenol). Systems in which the stabilizing agent is useful comprise a color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, a color-developing composition comprising an acidic coreactant material capable of reacting with the color-forming composition to provide colored products, and the stabilizing agent. The stabilizing agent prevents discoloration or fade of images produced by reaction of the color-forming composition with the color-developing composition. In a preferred embodiment, the color-forming composition additionally comprises dithiooxamide and/or dithiooxamide derivatives, the color-developing composition additionally comprises a transition metal ion capable of reacting with the dithiooxamide compound to produce a purple-colored product, and the reaction of the color-forming composition with the color-developing composition results in a neutral black colored product.
Inventors
- 👤 Thomas C. Geisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:51
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10S516/00; Y10S516/01; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24793
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
54 words
A color-forming composition which is substantially colorless, but which is capable of reacting with acidic coreactant materials to produce stable, fade-resistant colored products comprising at least one leuco dye compound which is fadeable or discolorable after development, and a stabilizing agent, carried in an organic solvent vehicle, wherein said stabilizing agent is 2,2'-methylene-bis(4-methyl-6-t-butyl phenol).
Claim 2
Dependent Claim
54 words
A color-forming composition which is substantially colorless, but which is capable of reacting with acidic coreactant materials to produce stable, fade-resistant colored products comprising at least one leuco dye compound which is fadeable or discolorable after development, and a stabilizing agent, carried in an organic solvent vehicle, wherein said stabilizing agent is 2,2'-methylene-bis(4-methyl-6-t-butyl phenol).
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein said leuco dye is selected from the group consisting of 2-octylamino-6-diethylaminofluoran and 2,6-diphenyl-4-(p-dimethylaminophenyl)pyridine.
Claim 4
Dependent Claim
37 words
The composition of claim 1 wherein said color-forming composition additionally comprises a compound selected from the group consisting of dithiooxamide, derivatives of dithiooxamide, and mixtures thereof, which is capable of forming colored complexes with transition metal salts.
Claim 5
Dependent Claim
43 words
An article for providing an image-forming composition comprising a carrier means carrying a color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, and a stabilizing agent carried in an organic solvent vehicle, said stabilizing agent being 2,2'-methylene-bis(4-methyl-6-t-butyl-phenol).
Claim 6
Dependent Claim
43 words
An article for providing an image-forming composition comprising a carrier means carrying a color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, and a stabilizing agent carried in an organic solvent vehicle, said stabilizing agent being 2,2'-methylene-bis(4-methyl-6-t-butyl-phenol).
Claim 7
Dependent Claim
19 words
The article of claim 4 wherein said leuco dye is selected from the group consisting of 2-octylamino-6-diethylaminofluoran and 2,6-diphenyl-4-(p-dimethylaminophenyl)pyridine.
Claim 8
Dependent Claim
32 words
The article of claim 4 wherein said color-forming composition also comprises an effective image producing amount of a compound selected from the group consisting of dithiooxamide, derivatives of dithiooxamide, and mixtures thereof.
Claim 9
Dependent Claim
13 words
The article of claim 4 wherein said carrier means is a transfer ribbon.
Claim 10
Dependent Claim
13 words
The article of claim 4 wherein said carrier means is a paper sheet.
Claim 11
Dependent Claim
17 words
The article of claim 8 wherein said color-forming composition is contained in substantially impermeable pressure rupturable capsules.
Claim 12
Dependent Claim
27 words
A manifold form comprising at least two sheets connected along a common edge wherein at least one of said sheets is the article according to claim 8.
Claim 13
Dependent Claim
105 words
A record sheet comprising a paper sheet having on at least a portion of one major surface a mixture of a color-forming composition, a color-developing composition and a stabilizing agent, wherein said color-forming composition is maintained in non-reactive isolation from said color-developing composition by microencapsulating either said color-forming composition or said color-developing composition in substantially impermeable pressure-rupturable microcapsules with an organic solvent vehicle; said color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, said color-developing composition comprising an acidic coreactant material capable of reacting with said color-forming composition to provide colored products, and said stabilizing agent being 2,2'-methylene-bis(4-methyl-6-t-butyl phenol).
Claim 14
Dependent Claim
105 words
A record sheet comprising a paper sheet having on at least a portion of one major surface a mixture of a color-forming composition, a color-developing composition and a stabilizing agent, wherein said color-forming composition is maintained in non-reactive isolation from said color-developing composition by microencapsulating either said color-forming composition or said color-developing composition in substantially impermeable pressure-rupturable microcapsules with an organic solvent vehicle; said color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, said color-developing composition comprising an acidic coreactant material capable of reacting with said color-forming composition to provide colored products, and said stabilizing agent being 2,2'-methylene-bis(4-methyl-6-t-butyl phenol).
Claim 15
Dependent Claim
105 words
A record sheet comprising a paper sheet having (a) substantially impermeable pressure-rupturable microcapsules containing a color-forming composition in a solvent vehicle within said paper sheet, said color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development; (b) a color-developing composition on at least a portion of one major surface of said paper sheet, said color-developing composition comprising an acidic coreactant material capable of reacting with said color-forming composition to provide colored products; and (c) a stabilizing agent carried in a composition selected from the group consisting of said color-developing composition and said color-forming composition, said stabilizing agent being 2,2'-methylene-bis(4-methyl-6-t-butyl phenol).
Claim 16
Dependent Claim
105 words
A record sheet comprising a paper sheet having (a) substantially impermeable pressure-rupturable microcapsules containing a color-forming composition in a solvent vehicle within said paper sheet, said color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development; (b) a color-developing composition on at least a portion of one major surface of said paper sheet, said color-developing composition comprising an acidic coreactant material capable of reacting with said color-forming composition to provide colored products; and (c) a stabilizing agent carried in a composition selected from the group consisting of said color-developing composition and said color-forming composition, said stabilizing agent being 2,2'-methylene-bis(4-methyl-6-t-butyl phenol).
Claim 17
Independent Claim
137 words
A system for forming stable, fade-resistant colored markings from a substantially colorless color-forming composition and a substantially colorless color-developing composition comprising: (a) a carrier means carrying said color-forming composition, said color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, carried in an organic solvent vehicle; (b) a record sheet having on at least a portion of one major surface said color-developing composition comprising an acidic coreactant material capable of reacting with said color-forming composition to provide colored products; (c) a stabilizing agent carried in a composition selected from the group consisting of said color-forming composition and said color-developing composition, said stabilizing agent being 2,2'-methylene-bis-(4-methyl-6-t-butyl phenol); and (d) transfer means for transferring at least a portion of said color-forming composition to selected areas of said record sheet having said color-developing composition thereon.
Claim 18
Independent Claim
137 words
A system for forming stable, fade-resistant colored markings from a substantially colorless color-forming composition and a substantially colorless color-developing composition comprising: (a) a carrier means carrying said color-forming composition, said color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, carried in an organic solvent vehicle; (b) a record sheet having on at least a portion of one major surface said color-developing composition comprising an acidic coreactant material capable of reacting with said color-forming composition to provide colored products; (c) a stabilizing agent carried in a composition selected from the group consisting of said color-forming composition and said color-developing composition, said stabilizing agent being 2,2'-methylene-bis-(4-methyl-6-t-butyl phenol); and (d) transfer means for transferring at least a portion of said color-forming composition to selected areas of said record sheet having said color-developing composition thereon.
Claim 19
Dependent Claim
49 words
The system of claim 13 wherein said color-forming composition additionally comprises an effective image producing amount of a compound selected from the group consisting of dithiooxamide, derivatives of dithiooxamide, and mixtures thereof, and wherein said color-developing composition additionally comprises an effective image producing amount of a transition metal salt.
Claim 20
Independent Claim
176 words
A system for forming stable, fade-resistant neutral black colored markings from a substantially colorless color-developing composition comprising: (a) a carrier means carrying said color-forming composition, said color-forming composition comprising a leuco dye composition, said leuco dye composition being selected from the group consisting of 2-octylamino-6-diethylaminofluoran, and a mixture of 2,6-diphenyl-4-(p-dimethylaminophenyl)-pyridine with crystal violet lactone, and a compound selected from the group consisting of N,N'-dibenzyl dithiooxamide, N,N'-bis(2-octanoyloxyethyl)dithiooxamide, di-dodecyl dithiooxamide, and mixtures thereof, in an organic solvent; (b) a record sheet having on at least a portion of one major surface an acidic coreactant material capable of reacting with said leuco dye composition to form colored products, and a transition metal salt capable of reacting with said dithiooxamide compound to form a blue-purple colored product; (c) a stabilizing agent carried in a composition selected from the group consisting of said color-developing composition and said color-forming composition, said stabilizing agent being 2,2'-methylene-bis-(4-methyl-6-t-butyl phenol); and (d) transfer means for transferring at least a portion of said color-forming composition to selected areas of said record sheet having said color-developing composition thereon.
Claim 21
Independent Claim
176 words
A system for forming stable, fade-resistant neutral black colored markings from a substantially colorless color-developing composition comprising: (a) a carrier means carrying said color-forming composition, said color-forming composition comprising a leuco dye composition, said leuco dye composition being selected from the group consisting of 2-octylamino-6-diethylaminofluoran, and a mixture of 2,6-diphenyl-4-(p-dimethylaminophenyl)-pyridine with crystal violet lactone, and a compound selected from the group consisting of N,N'-dibenzyl dithiooxamide, N,N'-bis(2-octanoyloxyethyl)dithiooxamide, di-dodecyl dithiooxamide, and mixtures thereof, in an organic solvent; (b) a record sheet having on at least a portion of one major surface an acidic coreactant material capable of reacting with said leuco dye composition to form colored products, and a transition metal salt capable of reacting with said dithiooxamide compound to form a blue-purple colored product; (c) a stabilizing agent carried in a composition selected from the group consisting of said color-developing composition and said color-forming composition, said stabilizing agent being 2,2'-methylene-bis-(4-methyl-6-t-butyl phenol); and (d) transfer means for transferring at least a portion of said color-forming composition to selected areas of said record sheet having said color-developing composition thereon.
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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) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |