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US 4,396,684 AGranted
Heat-sensitive recording paper causing reduced thermal head abrasion
AssigneeMitsubishi Paper Mills Limited
InventorsSadao Morishita, Fumio Okumura, Masahiro Higuchi, Syun Kamei
Life of this patent
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Abstract
In the heat-sensitive recording paper produced by coating a support such as paper or the like with a coating solution containing a normally colorless or light-colored dye precursor and a developer capable of making the precursor develop color upon heating, the abrasion of a thermal head can be decreased by adjusting the total amount of sodium and potassium ions in the coating on the heat-sensitive recording paper to 1,051 ppm or less, preferably 500 ppm or less, most preferably 400 ppm or less.
Claims3
A heat-sensitive recording paper composed of
- a paper, and
- a coating formed by applying to the surface of the paper a coating solution containing constituents parts which comprise
- a colorless or light-colored dye precursor and a developer capable of making the dye develop color upon heating, an organic or inorganic powder, a binder, a sensitizer, a dispersant, and industrial water,
- wherein the total amount of sodium and potassium ions in the coating is controlled to 601 ppm or less by excluding the use of sodium and/or potassium-containing compounds as the organic or inorganic powder, the binder, and the dispersant, and removing sodium and/or potassium as impurities contained in the organic or inorganic powder, the binder, the dispersant, and the industrial water.
1 more element
Dependencies are inferred from the claim text.