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US 5,669,965 AGranted
Hot melt ink
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsHidemasa Sawada, Jun Sakai
Life of this patent
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Abstract
A hot melt ink includes at least one wax substance having a melting point at a temperature ranging from 50.degree. C. to 150.degree. C. and a coloring agent substantially free of insoluble ingredients not soluble in the at least one wax substance. By removing insoluble ingredients from the coloring agent, for example by filtration, a hot melt ink is obtained that does not clog the printing head.
Claims20
A hot melt ink, comprising:
- at least one wax substance having a melting point at a temperature ranging from 50.degree. C. to 150.degree. C.;
- and
- a coloring material substantially free of insoluble ingredients not soluble in the at least one wax substance, wherein the insoluble ingredients are inorganic salts, analogous compounds having a number average molecular weight greater than that of the coloring material main body, analogous compounds having terminal groups different from those of the coloring material main body, or composite materials thereof.
A method for removing insoluble ingredients which are not soluble in a hot melt ink from a coloring material for a hot melt ink comprising:
- dissolving or dispersing the coloring material in an organic solvent;
- preparing a mixed solution of the coloring material and the organic solvent under stirring;
- filtering the mixed solution;
- collecting the material containing the coloring material;
- and
- drying the material containing the coloring material to obtain a purified powdery coloring material.
3 more elements
A hot melt ink, comprising:
- at least one wax substance having a melting point at a temperature ranging from 50.degree. C. to 150.degree. C.;
- and
- a coloring material substantially free of insoluble ingredients not soluble in the at least one wax substance, wherein the insoluble ingredients are removed from the coloring material by dissolving or dispersing the coloring material in an inorganic solvent to obtain a liquid mixture, filtering the liquid mixture, and extracting coloring material ingredients from a filter or the filtered liquid mixture.
Dependencies are inferred from the claim text.