Browse Prior Art Database

Image Formation by the Formation of a Charge Transfer Complex

IP.com Disclosure Number: IPCOM000092960D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gritter, RJ: AUTHOR [+2]

Abstract

In copying processes, such as the oil distillation process, an oil image is formed on the copy sheet. The image is developed or rendered visible by dark toner particles adhering to the image. The copy sheet is then heated to fix the particles to the sheet.

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Image Formation by the Formation of a Charge Transfer Complex

In copying processes, such as the oil distillation process, an oil image is formed on the copy sheet. The image is developed or rendered visible by dark toner particles adhering to the image. The copy sheet is then heated to fix the particles to the sheet.

In place of this development and fixing procedure, a colored image can be formed on the copy sheet. This is effected by using two colorless compounds, such as a pi-acid and a pi-base, which, when combined, form a colored charge transfer complex. For example, a pi-base, such as hexamethylbenzene, is admixed with a distilling solid, such as 2, 4-dimethylbenzophenone, and coated on the back of the original to be copied. A copy sheet carrying a pi-acid, such as tetracyanoethylene, is brought into contact with the back of the original. The composite is exposed to heat radiation thus causing a distillation of the pi-base and the distilling solid to the copy sheet in the image areas. The pi-base immediately complexes with the pi-acid to form a colored charge transfer complex.

Other pi-acids which can be used are indanetrione and pyromellitic anhydride. Other pi-bases are pentamethylbenzene and triphenylene.

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