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US 9,868,873 B2Granted
Photochromic security enabled ink for digital offset printing applications
AssigneeXerox Corporation
InventorsGabriel Iftime, Marcel P. Breton, Frank Ping-Hay Lee, Aurelian Valeriu Magdalinis, Naveen Chopra, Peter Gordon Odell, Carolyn Moorlag
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Abstract
An ink composition useful for digital offset printing applications comprises a photochromic material and a plurality of curable compounds. The compounds have Hansen solubility parameters as described herein, and the resulting ink composition is both compatible with certain dampening fluids and has certain rheological properties, including a low viscosity. The photochromic ink compositions are useful for providing security information in certain printing applications.
Claims14
An ink composition comprising
- a photochromic material,
- a colorant and
- a plurality of curable compounds,
- wherein the ink composition has
- a volume average Hansen fractional dispersion force parameter (fd) of from about 0.4 to about 0.62,
- a volume average Hansen fractional polar parameter (fp) of from about 0.1 to about 0.3, and
- a volume average Hansen fractional hydrogen bonding parameter (fh) of from about 0.2 to about 0.4,
- wherein the colorant comprises quantum dots,
- wherein the photochromic material comprises a diarylethene, spiropyran, spiroxazine, stilbene, aromatic azo compound, benzopyran, naphthopyran, spirodihydroindolizine, quinone, permidinespirocyclohexadienone, viologen, fulgide, fulgimide, triarylmethane, or anil, and
- wherein the plurality of curable compounds consist of, based on the total weight of the ink composition:
- from about 40 to about 55 wt % of a tetrafunctional acrylated polyester;
- from about 9 to about 11 wt % of a polyethylene glycol diacrylate;
- from about 9 to about 11 wt % of a tripropylene glycol diacrylate;
- and
- from greater than 0 to about 20 wt % of an aliphatic acrylate ester.
12 more elements
A process for marking a substrate with a security feature, comprising:
- printing an image on the substrate with an ink composition that comprises
- a photochromic material,
- a colorant and
- a plurality of curable compounds,
- the ink composition having
- a volume average Hansen fractional dispersion force parameter (fd) of from about 0.4 to about 0.62,
- a volume average Hansen fractional polar parameter (fp) of from about 0.1 to about 0.3, and
- a volume average Hansen fractional hydrogen bonding parameter (fh) of from about 0.2 to about 0.4,
- wherein the colorant comprises quantum dots,
- wherein the photochromic material comprises two or more photochromic materials, and
- wherein the two or more photochromic materials comprise a diarylethene, spiropyran, spiroxazine, stilbene, aromatic azo compound, benzopyran, naphthopyran, spirodihydroindolizine, quinone, permidinespirocyclohexadienone, viologen, fulgide, fulgimide, diarylethene, triarylmethane, or anil, and
- wherein the plurality of curable compounds consist of, based on the total weight of the ink composition:
- from about 40 to about 55 wt % of a tetrafunctional acrylated polyester;
- from about 9 to about 11 wt % of a polyethylene glycol diacrylate;
- from about 9 to about 11 wt % of a tripropylene glycol diacrylate;
- and
- from greater than 0 to about 20 wt % of an aliphatic acrylate ester.
14 more elements
An ink composition comprising
- a photochromic material,
- a colorant, and
- a plurality of curable compounds,
- wherein each curable compound has
- a Hansen fractional dispersion force parameter (fd) of from about 0.4 to about 0.62,
- a Hansen fractional polar parameter (fp) of from about 0.1 to about 0.3, and
- a Hansen fractional hydrogen bonding parameter (fh) of from about 0.2 to about 0.4,
- wherein the colorant comprises quantum dots,
- wherein the photochromic material comprises a diarylethene,
- wherein the diarylethene comprises 1,2-bis-(2,4-dimethylthiophen-3-yl) perfluorocyclopentene;
- 1,2-bis-(3,5-dimethylthiophen-3-yl) perfluorocyclopentene;
- or 1,2-bis-(2,4-diphenylthiophen-3-yl) perfluorocyclopentene, and
- wherein the plurality of curable compounds consist of, based on the total weight of the ink composition:
- from about 40 to about 55 wt % of a tetrafunctional acrylated polyester;
- from about 9 to about 11 wt % of a polyethylene glycol diacrylate;
- from about 9 to about 11 wt % of a tripropylene glycol diacrylate;
- and
- from greater than 0 to about 20 wt % of an aliphatic acrylate ester.
15 more elements
Dependencies are inferred from the claim text.