Non aqueous dispersion ink with improved shelf life, tack and flow
AssigneePitney Bowes Inc.
InventorsJudith D. Auslander, Norman C. Hochwalt
Life of this patent
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Abstract
Ink formulations have been conceived that result in inks having improved shelf life, tack and flow properties so that problems relating to ink plugging with contemporary ink pads are reduced. Another advantage of the inks is that they have improved paper dust resistance. These inks are made of a coloring material having an organic pigment dispersed in a modified rosin ester or dispersed in a modified rosin ester and triazine formaldehyde aryl sulphonamide resin dispersed in an alkyd oil. The solvent system is preferably composed of non drying solvents such as emollients and high molecular weight glycols.
Claims17
A non aqueous dispersion ink composition, comprising:
- a) 40 to 90% by weight of a non aqueous continuing phase, comprising:
- 70-90% by weight emollient, 0.2-1 organic titanate coupling agent, and 10 to 30% polypropylene glycol, and
- b) 1-10% organic pigment having a particle size of 0.1 to 0.4 microns dispersed in rosin ester vehicle.
A non aqueous dispersion ink composition comprising:
- a) 40 to 90% by weight low molecular weight solvent containing 70 to 90% by weight emollient and 10 to 30% by weight polypropylene glycol, and
- b) 1 to 10% by weight organic pigment having a particle size of 0.1 to 0.4 microns dispersed in a rosin ester vehicle.
A non aqueous dispersion ink composition comprising:
- a) 40 to 90% by weight solvent comprising 70 to 90% by weight emollient and 10 to 30% by weight polypropylene glycol,
- b) 1 to 10% by weight organic pigment dispersed in a vehicle,
- c) up to 5% by weight organic pigment flushed in a non-ionic surfactant, and
- d) 5 to 20% to weight triazine aryl sulphonamide paraformaldehyde resin dispersed in linseed oil resin.
A non aqueous dispersion ink composition, comprising:
- a) 40 to 90% by weight of an non aqueous phase, comprising:
- 70 to 90% by weight non aqueous, fatty acid solvent and 0.2 to 1% by weight organic titanate coupling agent,
- b) 1-10% by weight organic pigment having a particle size 0.1 to 0.4 microns dispersed in rosin ester vehicle,
- c) up to 10% by weight organic pigment flushed in non-ionic surfactant, and
- d) 5 to 20% by weight triazine aryl sulphonamide paraformaldehyde resin dispersed in linseed oil alkyl resin.
Dependencies are inferred from the claim text.