Invisible fluorescent jet ink
First Claim
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1. A jet ink composition suitable for providing a mark on white or light colored substrates, wherein said composition comprises a colorant and an ink carrier and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane.
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Abstract
The present invention provides jet ink compositions suitable for producing security markings on documents and other articles for subsequent identification. The jet ink composition comprises a fluorescent colorant, an ink carrier, and optionally one or more binder resins. The markings are invisible to the unaided eye and are visible only when excited by ultraviolet light. The colorant comprises a rare earth metal and a chelating ligand, is excitable by ultraviolet light having a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 550 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane. The present invention further provides a method of identifying objects comprising providing a security marking as described above, exciting the marking and reading the fluorescent emission. The present invention also provides a system for identification of objects bearing the security markings.
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Citations
66 Claims
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1. A jet ink composition suitable for providing a mark on white or light colored substrates, wherein said composition comprises a colorant and an ink carrier and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A jet ink composition suitable for printing a mark on white or light colored substrates, wherein said composition comprises a colorant, an ink carrier, and one or more binder resins and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the chelating ligand is dibenzoylmethane, the binder resin is not ethylcellulose or polyvinylbutyral.
- View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A system for marking items with a mark for subsequent identification comprising a printing means for printing said mark on said items, wherein said printing means employs an ink composition, wherein said composition comprises a colorant and an ink carrier and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, and terbium, the chelating ligand is not dibenzoylmethane.
- View Dependent Claims (28, 29, 30, 31, 32)
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33. A system for identifying items with a security mark said system comprising an excitation means for exciting said mark and a fluorescence detecting means for detecting the fluorescent emission of said mark, wherein said mark comprises an ink composition, wherein said composition comprises a colorant and an ink carrier, has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, is completely or substantially invisible to the unaided eye, and is visible only when excited by ultraviolet light, and wherein said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, and terbium, the chelating ligand is not dibenzoylmethane.
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34. A method of providing a mark on a substrate for subsequent identification comprising applying onto said substrate an ink composition, wherein said composition comprises a colorant and an ink carrier and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, and removing all or substantially all of said ink carrier by evaporation or absorption into said substrate, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane.
- View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A mark provided on a substrate for subsequent identification wherein said mark is completely or substantially invisible to the unaided eve, is visible only when excited by ultraviolet light, and absorbs light at a wavelength of from about 275 nm to about 400 nm, and fluoresces light at a wavelength of from about 575 nm to about 700 nm, wherein said mark is provided by an ink composition, wherein said composition comprises a colorant and an ink carrier and has a viscosity of from about 1.8 cps to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said colorant comprises a rare earth metal and a chelating ligand, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane.
- View Dependent Claims (47, 48)
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49. A method of identifying objects comprising the steps of (a) applying identifying markings to said objects using a jet ink composition, wherein said composition comprises a colorant and an ink carrier, has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, and removing all or substantially all of said ink carrier by evaporation or absorption into said substrate, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane;
(b) subjecting said objects to exciting radiation having a wavelength of from about 275 nm to about 400 nm;
(c) reading said markings by detecting fluorescent radiation from said markings; and
(d) identifying said objects in response to the reading of said markings. - View Dependent Claims (50, 51, 52, 53, 54)
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, and removing all or substantially all of said ink carrier by evaporation or absorption into said substrate, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane;
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55. A substrate having identifying markings produced by jet printing onto said substrate an ink composition, wherein said composition comprises a colorant and an ink carrier and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said markings are substantially invisible to the unaided eye and are visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane.
- View Dependent Claims (56, 57, 58, 59, 60)
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61. A jet ink composition suitable for marking on white or light colored substrates, wherein said composition comprises a colorant and an ink carrier and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that the colorant does not include dysprosium, europium, or terbium dibenzoylmethide.
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62. A jet ink composition suitable for marking on white or light colored substrates comprising a colorant, an ink carrier, a polyurethane resin and at least one other resin wherein said jet ink composition has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2,000 ohm-cm, and a sonic velocity of from about 1200 meters/second to about 1700 meters/second, and said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant comprises a rare earth metal and a chelating ligand, absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane.
- View Dependent Claims (63, 64, 65)
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66. A jet ink composition suitable for marking on white a light colored substrate wherein said composition comprises a colorant, an ink carrier, a polyurethane resin and at least one other resin, and has a viscosity of from about 1.8 centipoises (cps) to about 6 cps at 25°
- C., an electrical resistivity of from about 20 ohm-cm to about 2000 ohm cm, and a sonic velocity of from about 1200 meter/second to about 1700 meters/second, and wherein said mark is completely or substantially invisible to the unaided eye and is visible only when excited by ultraviolet light, and said colorant absorbs at a wavelength of from about 275 nm to about 400 nm, and fluoresces at a wavelength of from about 575 nm to about 700 nm, with the proviso that when the rare earth metal is europium, dysprosium, or terbium, the chelating ligand is not dibenzoylmethane.
Specification
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Current AssigneeMarconi Data Systems Incorporated (Danaher Corporation)
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Original AssigneeVideojet Systems International Incorporated (Danaher Corporation)
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InventorsDeng, Godwin, Ezpeleta, Jose F., Lent, Bruce A.
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Primary Examiner(s)JONES, DEBORAH D
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Application NumberUS08/661,180Time in Patent Office890 DaysField of Search106/31.14, 106/31.15, 283/74, 347/20, 427/7US Class Current106/31.14CPC Class CodesB41M 3/144 using fluorescent, luminesc...C09D 11/36 based on non-aqueous solventsC09D 11/50 Sympathetic, colour changin...G06K 19/06046 Constructional detailsG06K 7/12 using a selected wavelength...
