Blush resistant invisible fluorescent jet ink
First Claim
1. A jet ink composition suitable for producing marks on objects that are invisible to the unaided eye and are visible only when excited by an exciting radiation comprising an organic solvent, a fluorescent colorant, a binder resin selected from the group consisting of styrene-acrylic resins having an acid number of 53 or less and sulfonamide resins, and a butyl benzyl phthalate plasticizer, wherein said mark is blush resistant when exposed to water at a temperature of about 150°
- F. for a period of up to about 5 minutes.
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Accused Products
Abstract
Disclosed are jet ink compositions suitable for producing marks on objects that are invisible to the unaided eye and are visible only when excited by an exciting radiation comprising a solvent, a fluorescent colorant, a binder resin, and a plasticizer having a vapor pressure of about 15 mm Hg or less at 240° C. Examples of suitable binder resins include an acrylic resin, a toluenesulfonamide resin, and a sulfonamide-formaldehyde resin. An example of a suitable plasticizer is o-butyl benzyl phthalate. The marks are blush resistant when exposed to water at 150° F. and above for 5 minutes. Also disclosed is an improved method of identifying objects, the improvement comprising providing a blush resistant identifying mark using the inventive jet ink compositions. A system for identifying objects with a blush resistant identification mark is also disclosed.
66 Citations
58 Claims
- 1. A jet ink composition suitable for producing marks on objects that are invisible to the unaided eye and are visible only when excited by an exciting radiation comprising an organic solvent, a fluorescent colorant, a binder resin selected from the group consisting of styrene-acrylic resins having an acid number of 53 or less and sulfonamide resins, and a butyl benzyl phthalate plasticizer, wherein said mark is blush resistant when exposed to water at a temperature of about 150°
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44. A method of providing a mark on a substrate for subsequent identification comprising applying onto said substrate a jet ink composition comprising an organic solvent, a fluorescent colorant, a binder resin selected from the group consisting of styrene-acrylic resins having an acid number of 53 or less and sulfonamide resins, and a butyl benzyl phthalate plasticizer, and removing all or substantially all of said solvent, wherein said mark is blush resistant when exposed to water at a temperature of about 150°
- F. for a period of up to about 5 minutes.
- View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
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52. In an improved method of identifying objects comprising providing an identifying mark on said objects, exciting said mark with an excitation radiation to obtain an emission radiation, and reading said emission radiation, the improvement comprising providing a mark using a jet ink composition comprising an organic solvent, a fluorescent colorant, a binder resin selected from the group consisting of styrene-acrylic resins having an acid number of 53 or less and sulfonamide resins, and a butyl benzyl phthalate plasticizer, wherein said mark is blush resistant when exposed to water at a temperature of about 150°
- F. for a period of up to about 5 minutes.
- View Dependent Claims (53, 54, 55)
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56. A system for identifying objects with an identification mark 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 a fluorescent colorant, a binder resin selected from the group consisting of styrene-acrylic resins having an acid number of 53 or less and sulfonamide resins, and a butyl benzyl phthalate plasticizer, wherein said mark is blush resistant when exposed to water at a temperature of about 150°
- F. for a period of up to about 5 minutes.
- View Dependent Claims (57, 58)
Specification