Pressure-sensitive transfer elements and process

Details Pressure-sensitive transfer elements and process Pressure-sensitive transfer elements and process

B - Operations, Transporting

41

M

197/114, 117/14

B41M 5/10 (2006.01)

Patent

CA 1124585

C198-A PRESSURE-SENSITIVE TRANSFER ELEMENTS AND PROCESS Abstract of the Disclosure A thin, pressure-sensitive, ink-releasing transfer ele- ment, such as a ribbon, capable of releasing a substantially uniform and intense amount of smudge-resistant ink at least about four times from overlapping impressed areas of the ink layer corresponding to each double image width during high speed printing use on "hammer-impression" high speed type- writers. The thinness of the ribbon is important not only to accommodate a maximum amount of ribbon on the feed spool, but primarily in order to provide a ribbon which is operative in such typewriters to produce images having excellent sharpness, uniform intensity, edge profile and freedom from pick-over, which properties also result from the cooperative nature of the ink and undercoating used on such ribbons. The present method involves applying an ink layer comprising a microporous resinous binder containing pressure-exudable, substantially- solid, thixotropic ink having a viscosity of at least about 100,000 centipoises and containing a hydrophilic pigment and a wetting agent having both hydrophilic and oleophilic radicals, by means of a volatile coating vehicle comprising a miscible. mixture of (a) a volatile liquid solvent which is a solvent for the resinous binder and for the ink vehicle but is a non-solvent for the wetting agent and (b) another less volatile liquid which is a solvent for the wetting agent and for the ink vehicle but is a non-solvent for the resinous binder.

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