Ink for use in an ink wire dot printer

Claim 2

An ink for use in an ink wire dot printer comprising a dyestuff; at least one polyhydric alcohol or a derivative thereof; and a water-soluble amine.

Claim 3

An ink as claimed in claim 1 in which the dyestuff is a water-soluble dyestuff or is an oleaginous dyestuff soluble in a polar solvent.

Claim 4

An ink as claimed in claim 1 or 2 in which the ink has a viscosity of 20 to 70 centipoise at 20°C, a surface tension of 35 to 50 dyn/cm, and a pH of 8 to 11 in a 20% aqueous solution.

Claim 5

An ink as claimed in any preceding claim in which the amine has a freezing point of 21°C or below, a boiling point of 200°C or above, and a vapour pressure of 0.01 mmHg or below.

Claim 6

An ink as claimed in any preceding claim in which at least one said polyhydric alcohol or derivative thereof has a boiling point of 200°C or above, a freezing point of 20 9 C or below, a vapour pressure of O.OlmmHg or below at 20°C and a viscosity of 50 centipoise or above at 20°C.

Claim 7

An ink as claimed in any preceding claim in which the ink comprises a liquid component which is soluble in the polyhydric alcohol or derivative.

Claim 8

An ink as claimed in claim 6 in which the said liquid component has a boiling point of 120°C or above, a freezing point of O°C or below, a vapour pressure of 6mmHg or below at 20°C and a viscosity of 50 centipoise or below at 20° C .

Claim 9

An ink as claimed in any of claims 1-6 in which the ink contains substantially no water.

Claim 10

An ink as claimed in any preceding claim when used in an ink wire dot printer.

Claim 13

A method as claimed in claim 10 in which the ink contains a polyhydric alcohol or an ether thereof.

Claim 14

An ink-supplied wire dot printer wherein a wire is projected onto a recording paper, and ink at the tip of the wire is transferred to the recording paper to form a dot, characterised in that the ink solvent and wetting agent are devoid of water.

Claim 15

An ink-supplied wire dot printer wherein a wire is projected onto a recording paper, and ink at the tip of the wire is transferred to the recording paper to form a dot, characterised in that the ink solvent and wetting agent are devoid of water.

Claim 16

An ink for use in an ink wire dot printer, in which the ink does not have water as a principal component and in which the ink comprises a water-soluble dyestuff or an oleaginuous dyestuff soluble in a polar solvent, polyhydric alcohol or a derivative thereof, and a water-soluble amine, the ink having a viscosity of 20 to 70 centipotse(CP) at 20°C, a surface tension of 35 to 50 dyn/cm and a pH of 8 to 11 in a 20% aqueous solution.

Claim 17

An ink for use in an ink wire dot printer, in which the ink does not have water as a principal component and in which the ink comprises a water-soluble dyestuff or an oleaginuous dyestuff soluble in a polar solvent, polyhydric alcohol or a derivative thereof, and a water-soluble amine, the ink having a viscosity of 20 to 70 centipotse(CP) at 20°C, a surface tension of 35 to 50 dyn/cm and a pH of 8 to 11 in a 20% aqueous solution.

Claim 18

. An ink for use in an ink wire dot printer comprising a water-soluble dyestuff or an oleaginuous dyestuff soluble in a polar solvent; a first liquid component selected from at least one polyhydric alcohol or a derivative thereof having a boiling point of 200°C or above a freezing point of 20°C or below, a vapour pressure of 0.01 mmHg or below at 20°C and a viscosity of 20°C or of 50 centipoise or above at 20°C; a second liquid component which is soluble in the first liquid component and has a boiling point of 120°C or above, a freezing point of O°C or below, a vapour pressure of 6mmHg or below at 20°C, and a viscosity of 50 centipoise or below at 20°C; and a water-soluble amine having a freezing point of 21°C or below, a vapour pressure of O.OlmmHg or below at 20° C , and a boiling point of 20O°C or above; the ink having a viscosity of 20 to 70 centipoise at 20°C, a surface tension of 35 to 50 dyn/cm and a pH of 8 to 11 in a 20% aqueous solution.

Claim 19

. An ink for use in an ink wire dot printer comprising a water-soluble dyestuff or an oleaginuous dyestuff soluble in a polar solvent; a first liquid component selected from at least one polyhydric alcohol or a derivative thereof having a boiling point of 200°C or above a freezing point of 20°C or below, a vapour pressure of 0.01 mmHg or below at 20°C and a viscosity of 20°C or of 50 centipoise or above at 20°C; a second liquid component which is soluble in the first liquid component and has a boiling point of 120°C or above, a freezing point of O°C or below, a vapour pressure of 6mmHg or below at 20°C, and a viscosity of 50 centipoise or below at 20°C; and a water-soluble amine having a freezing point of 21°C or below, a vapour pressure of O.OlmmHg or below at 20° C , and a boiling point of 20O°C or above; the ink having a viscosity of 20 to 70 centipoise at 20°C, a surface tension of 35 to 50 dyn/cm and a pH of 8 to 11 in a 20% aqueous solution.