Fluorescent red and magenta waterfast ink jet inks
First Claim
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1. A postage metering system having a printing mechanism for printing postage, the improvement comprising:
- within the printing mechanism employing a red aqueous magenta waterfast fluorescent ink containing water, water soluble organic solvents, red fluorescent soluble toners and glycol ether as a cosolvent penetrant that are inert to the materials contained in the printing mechanism.
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Abstract
Aqueous fluorescent inks are disclosed that fulfill United Sites Postal Service requirements for franking and/or automation compatibility, while being able to be used in an ink jet printer. The inks of this invention may be read by current United States Postal Service equipment. The inks are red fluorescent and waterfast, having improved print quality. The formulations are based on water, cosolvent and penetrant solutions of fluorescent toners. The cosolvents are low vapor pressure, polar solvents, and glycol ethers as penetrants.
74 Citations
26 Claims
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1. A postage metering system having a printing mechanism for printing postage, the improvement comprising:
- within the printing mechanism employing a red aqueous magenta waterfast fluorescent ink containing water, water soluble organic solvents, red fluorescent soluble toners and glycol ether as a cosolvent penetrant that are inert to the materials contained in the printing mechanism.
- View Dependent Claims (2, 3, 4)
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5. A red aqueous waterfast fluorescent ink composition consisting essentially of:
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a. 35-55 (Wt. %) water; b. 15-50 (Wt. %) water soluble organic cosolvents having a hydrogen bonding solubility parameter (δ
h) greater than 8.0, a polar solubility parameter (δ
p) greater than 5.0 and a dispersion parameter (δ
.sub.δ
) between 7-8.3;c. 5-15 (Wt. %) red fluorescent soluble toners with a average molecular weight between 200 and a 1,000; and d. 5-15 (Wt. %) of glycol ether as a cosolvent penetrant. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A red aqueous waterfast fluorescent ink composition consisting essentially of:
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a. 35-55 (Wt. %) water; b. 15-50 (Wt. %) water soluble organic solvents having a hydrogen bonding solubility parameter (δ
h) greater than 5.0, a polar solubility parameter (δ
p) between 8.0-8.7 and a dispersion parameter (δ
.sub.δ
)between 8.4-10.0;c. 5-15 (Wt. %) fluorescent soluble toners with a molecular weight between 200 and a 1,000; and d. 5-15 (Wt. %) of glycol ether as a cosolvent penetrant. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification