US4536219A
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Thermographic recording compositions
Assignee: Aussedat Rey SA
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Filing: 1983-07-13
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Granted: 1985-08-20
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Expires: 2003-07-13
Abstract
Abstract The invention relates to novel thermographic recording compositions. Novel color developers for thermographic compositions consist of the compounds of the formula: ##STR1## The invention is useful for recording supports for data generally, for example, computers, medical, etc.
Inventors
- 👤 Claude R. Riou
- 👤 Jean F. Fayard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:28
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/26; B41M5/30; B41M5/333; B41M5/3333
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
123 words
A thermographic composition comprising a color former and a color developer, wherein said color developer comprises a compound of the formula: ##STR12## wherein n is an integer of from 0 to 4; each R independently represents H, alkyl, NO 2 , halogen, aryl, NH 2 , OH, COOH, SO 3 H, NR 1 R 2 , COOR 3 , or OR 4 ; wherein R 1 , R 2 , R 3 and R 4 are alkyl or aryl; X represents H, a group possessing a labile H capable of forming a stable anion by loss of a proton H + , and their salts of the formula ##STR13## in which Y represents X minus H and M + represents a metal cation.
Claim 2
Dependent Claim
123 words
A thermographic composition comprising a color former and a color developer, wherein said color developer comprises a compound of the formula: ##STR12## wherein n is an integer of from 0 to 4; each R independently represents H, alkyl, NO 2 , halogen, aryl, NH 2 , OH, COOH, SO 3 H, NR 1 R 2 , COOR 3 , or OR 4 ; wherein R 1 , R 2 , R 3 and R 4 are alkyl or aryl; X represents H, a group possessing a labile H capable of forming a stable anion by loss of a proton H + , and their salts of the formula ##STR13## in which Y represents X minus H and M + represents a metal cation.
Claim 3
Dependent Claim
36 words
A thermographic composition according to claim 1, wherein X is selected from the group consisting of H, OH, (CH 2 ) m --OH in which m is an integer of from 1 to 10, and ##STR14##
Claim 4
Dependent Claim
13 words
A thermographic composition according to claim 1 or 2, wherein X is H.
Claim 5
Dependent Claim
25 words
A thermographic composition according to claim 1 or 2, wherein R is selected from the group consisting of H, lower alkyl, halogen, nitro and amino.
Claim 6
Dependent Claim
27 words
A thermographic composition according to claim 1 or 2, wherein M is selected from the group consisting of Cu, Cd, Co, Fe (II), Ni, Mn and Zn.
Claim 7
Dependent Claim
37 words
A thermographic composition according to claim 1 or 2, wherein the color developer is selected from the group consisting of saccharin, 1'-bromo saccharin, 1'-nitro saccharin, 1'-amino saccharin, saccharin 5'-carboxylic acid, meta disaccharin, para disaccharin, and 1-methylol saccharin.
Claim 8
Dependent Claim
37 words
A thermographic composition according to claim 1, wherein the color former is selected from the group consisting of lactones of triphenyl methane colorant, fluoranes, phthalides, triaryl methane leuco-colorants, spiropyrans, chromenes, chromanes, substituted phenothiazine and colorants of phenoxazine.
Claim 9
Dependent Claim
36 words
A thermographic composition according to claims 1 or 7, further comprising at least one additional component selected from the group consisting of a polymer binder, waxes or compounds with low melting point, and a pigmentary filler.
Claim 10
Dependent Claim
54 words
A thermographic composition according to claim 1 or 7, wherein the color former/developer couples are selected from the group consisting of black color former/saccharin, Lactone crystal violet/saccharin-zinc acetate, red color former/saccharin, Lactone crystal violet/saccharin, black color former/1'-bromo saccharin, black color former/saccharin-manganese nitrate and Product T/Methylol saccharin, wherein Product T corresponds to the formula ##STR15##
Claim 11
Independent Claim
147 words
A method for providing a thermographic color change, said method comprising the step of heating a thermographic composition to a temperature sufficient to cause a color forming reaction between a color former and color developer therein, wherein said color developer comprises a compound to the formula: ##STR16## wherein n is an integer of from 0 to 4; each R independently represents H, alkyl, NO 2 , halogen, aryl, NH 2 , OH, COOH, SO 3 H, NR 1 R 2 , COOR 3 , or OR 4 ; wherein R 1 , R 2 , R 3 and R 4 are alkyl or aryl; x represents H, a group possessing a labile H capable of forming a stable anion by loss of proton H + , and their salts of the formula ##STR17## in which Y represents X minus H and M + represents a metal cation.
Claim 12
Independent Claim
147 words
A method for providing a thermographic color change, said method comprising the step of heating a thermographic composition to a temperature sufficient to cause a color forming reaction between a color former and color developer therein, wherein said color developer comprises a compound to the formula: ##STR16## wherein n is an integer of from 0 to 4; each R independently represents H, alkyl, NO 2 , halogen, aryl, NH 2 , OH, COOH, SO 3 H, NR 1 R 2 , COOR 3 , or OR 4 ; wherein R 1 , R 2 , R 3 and R 4 are alkyl or aryl; x represents H, a group possessing a labile H capable of forming a stable anion by loss of proton H + , and their salts of the formula ##STR17## in which Y represents X minus H and M + represents a metal cation.
Claim 13
Dependent Claim
35 words
A process according to claim 10, wherein X is selected from the group consisting of H, --OH, (CH 2 ) m --OH in which m is an integer of from 1 to 10, and ##STR18##
Claim 14
Dependent Claim
24 words
A process according to claim 10 or 11, wherein R is selected from the group consisting of H, lower alkyl, halogen, nitro and amino.
Claim 15
Dependent Claim
26 words
A process according to claim 10 or 11, wherein M is selected from the group consisting of Cu, Cd, Co, Fe (II), Ni, Mn and Zn.
Claim 16
Dependent Claim
36 words
A process according to claim 10 or 11, wherein the color developer is selected from the group consisting of saccharin, 1'-bromo saccharin, 1'-nitro saccharin, 1'-amino saccharin, saccharin 5'-carboxylic acid, meta disaccharin, para disaccharin, and 1-methylol saccharin.
Claim 17
Dependent Claim
36 words
A process according to claim 10, wherein the color former is selected from the group consisting of lactones of triphenyl methane colorant, fluoranes, phthalides, triaryl methane leuco-colorants, spiropyrans, chromenes, chromanes, substituted phenothiazine, and colorants of phenoxazine.
Claim 18
Dependent Claim
39 words
A process according to claim 10 or 15, wherein the thermographic composition further comprises at least one additional component selected from the group consisting of a polymer binder, waxes or compounds with low melting point, and a pigmentary filler.
Claim 19
Dependent Claim
53 words
A process according to claim 10 or 15, wherein the color former/developer couples are selected from the group consisting of black color former/saccharin, Lactone crystal violet/saccarin-zinc acetate, red color former/saccarin, Lactone crystal violet/saccharin, black color former/1'-bromo saccharin, black color former/saccharin-manganese nitrate and Product T/Methylol saccharin, wherein Product T corresponds to the formula ##STR19##
Claim 20
Dependent Claim
10 words
A process according to claim 10, wherein X is H.
References Cited (Backward Citations)
US3080254A
Cited
CH406257A
Cited
FR1440892A
Cited
US3539375A
Cited
US3746675A
Cited
FR2272082A1
Cited
DE2727775A1
Cited
US4052244A
Cited
FR2391858A1
Cited
JPS54104908A
Cited
FR2427209A1
Cited
FR2427210A1
Cited
FR2442139A1
Cited
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