Electrophoretical method for selectively reinking resistive ribbon thermal transfer printing ribbons
US4268368A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1980 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Mar 24, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D13/16
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method is described for selectively reinking a resistive ribbon thermal transfer printing ribbon, comprising: PA0 (1) positioning a used resistive ribbon thermal transfer printing ribbon in a colloidal dispersion of electrophoretically depositable ink prepared PA1 (a) heating a water-insoluble polymeric binder having a melting point in the range of 85.degree. C. to 100.degree. C. until the polymeric binder has been melted to a liquid state, PA1 (b) adding and blending a pigment into the melted polymeric binder, PA1 (c) adding and blending a heated dilute, aqueous solution of a carboxylic acid to the composition formed in (b), and PA1 (d) adding and blending a colloid charge-forming compound to the composition formed in (c), to form an aqueous dispersion of a pigment-containing polymeric colloid, PA1 (e) cooling the dispersion formed in (d); and PA0 (2) passing an electric current through said colloidal dispersion, with an electrically conductive layer of said ribbon serving as one electrode, to electrophoretically deposit the pigment-containing polymeric colloid on areas of said ribbon that have been depleted of ink, to form a ink layer of uniform thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.