Imaging system
View Patent ↗There are disclosed imaging members wherein a chemical compound in a crystalline form is converted, at least partially, and preferably substantially completely or completely, to a liquid in the amorphous form, the liquid having intrinsically a different color from the crystalline form. Also described are imaging methods utilizing the imaging members. The conversion of the compound from the crystalline form to the liquid form can be effected by the application of thermal energy or by other imaging techniques.
1. A color imaging member comprising a substrate bearing one or more color-forming layers, wherein at least one of said color-forming layers comprises a chemical compound in a crystalline form, said crystalline form being capable of being converted to an amorphous form, said chemical compound having intrinsically a different color in said crystalline form than in said amorphous form.
2. The imaging member as defined in claim 1 wherein the melting point of said chemical compound in said crystalline form is between about 60° C. and about 300° C.
3. The imaging member as defined in claim 1 in which the range of temperatures over which said chemical compound in said crystalline form melts is less than about 15° C.
4. The imaging member as defined in claim 1 wherein the Tg of said amorphous form of said chemical compound is about 50° C. or greater.
5. The imaging member as defined in claim 1 comprising at least two color-forming layers.
6. The imaging member as defined in claim 5 wherein a first color-forming layer comprises a first chemical compound in a crystalline form, and a second color-forming layer comprises a second chemical compound in a crystalline form, said crystalline forms of said first and second chemical compounds being capable of being converted to amorphous forms, said first and second chemical compounds having intrinsically different colors in said crystalline forms than in said amorphous forms.
7. The imaging member as defined in claim 1 comprising three color-forming layers.
8. The imaging member as defined in claim 7 wherein said color-forming layers form cyan, magenta and yellow, respectively.
9. The imaging member as defined in claim 7 wherein at least one of said color-forming layers is carried by a first side of said substrate and at least another of said color-forming layers is carried by a second side of said substrate.
10. The imaging member as defined in claim 9 wherein magenta and yellow color-forming layers are carried by said first side of said substrate and a cyan color-forming layer is carried by said second side of said substrate.
11. The imaging member as defined in claim 7 wherein said color-forming layers are initially substantially colorless.
12. The imaging member as defined in claim 1 wherein said color-forming layer comprising said chemical compound is initially substantially colorless.
13. A color imaging method comprising the steps of:
(a) providing an imaging member as defined in claim 1 ; and
(b) converting at least a portion of said chemical compound to an amorphous form in an imagewise pattern,
whereby an image is formed.
14. The method as defined in claim 13 wherein step (b) comprises applying an imagewise pattern of thermal energy to said imaging member, said thermal energy being sufficient to convert at least some of said chemical compound to an amorphous form.
15. The method as defined in claim 14 wherein said imaging member includes at least two color-forming layers whereby a multicolor image is formed.
16. The method as defined in claim 15 wherein said imaging member includes three color-forming layers whereby a multicolor image is formed.
17. The method as defined in claim 16 wherein said color-forming layers form cyan, magenta and yellow, respectively.
18. The method as defined in claim 16 wherein at least one of said imaging wherein at least one of said color-forming layers is carried by a first side of said substrate and at least another of said color-forming layers is carried by a second side of said substrate.
19. The method as defined in claim 18 wherein magenta and yellow color-forming layers are carried by said first side of said substrate and a cyan color-forming layer is carried by said second side of said substrate.
20. The method as defined in claim 16 wherein said color-forming layers are initially colorless.
21. The method as defined in claim 15 wherein a first color-forming layer comprises a first chemical compound in a crystalline form, and a second color-forming layer comprises a second chemical compound in a crystalline form, said crystalline forms of said first and second chemical compounds being capable of being converted to amorphous forms, said first and second chemical compounds having intrinsically different colors in said crystalline forms than in said amorphous forms.
22. The method as defined in claim 13 wherein said color-forming layer comprising said chemical compound is initially colorless.
23. The method as defined in claim 13 wherein the melting point of said chemical compound in said crystalline form is between about 60° C. and about 300° C.
24. The method as defined in claim 13 wherein the range of temperatures over which said chemical compound in said crystalline form melts is less than about 15° C.
25. The method as defined in claim 13 wherein the Tg of the amorphous form of said chemical compound is about 50° C. or greater.