# US 8,785,866 B2 · Compositions having multiple responses to excitation radiation and methods for making same

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- Number: US 8,785,866 B2
- Document ID: US8785866B2
- Status: Granted
- Kind: B2
- Application number: 13/548,364
- Filed: 2012-07-13
- Published: 2012-11-01
- Granted: 2014-07-22
- Earliest claimed: 2007-07-05
- Assignees: Cabot Corporation
- Applicants: Mark J. Hampden-Smith; Liam Noailles; Richard A. Einhorn
- Inventors: Mark J. Hampden-Smith; Liam Noailles; Richard A. Einhorn
- Web page: https://patentgrep.com/patent/US8785866B2

## CPC

- G01N 21/64: Fluorescence; Phosphorescence
- B41C 1/00: Forme preparation
- C09K 11/7769: {Oxides (C09K11/7768 takes precedence)}
- G07D 7/06: using wave or particle radiation
- G07D 7/1205: Testing spectral properties
- B42D 25/382: absorbing or reflecting infrared light
- B42D 25/387: absorbing or reflecting ultraviolet light
- G02F 2/02: Frequency-changing of light, e.g. by quantum counters
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- B41C: PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES (photomechanical processes for producing printing surfaces G03F; photoelectrical processes for producing printing surfaces G03G)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G07D: HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present invention relates to a composition having a first response to a first electromagnetic radiation and, after intermediate exposure to a second electromagnetic radiation, a second response to the first electromagnetic radiation, different from the first response. In one aspect, the composition exhibits a regenerated first response to the first electromagnetic radiation after exposure to a third electromagnetic radiation.

## Claims

### Claim 1

A method for authenticating an article by using a regenerable composition comprising a plurality of forms having a plurality of responses, the method comprising:
subjecting the composition to a first electromagnetic radiation and generating a first response;
applying a second electromagnetic radiation to transform the composition from a first form having the first response to a second form having a second response to the first electromagnetic radiation that is different from the first response; and
subjecting the composition to the first electromagnetic radiation and generating the second response,
wherein the composition comprises a host material, an emissive material, and an emission modifier, and
wherein the composition is incorporated into a security feature for authenticating the article.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first response and/or the second response comprise electromagnetic radiation in the ultraviolet spectrum.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first response and/or the second response comprise electromagnetic radiation in the infrared spectrum.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first response and/or the second response comprise electromagnetic radiation in the visible spectrum.

### Claim 5 (depends on 1)

The method of claims claim 1, wherein the composition exhibits a regenerated first response to the first electromagnetic radiation after exposure to a third electromagnetic radiation.

### Claim 6 (depends on 1)

The method of claim 1, wherein the host material comprises an oxygen-containing compound selected from the group consisting of Y2O3, Y2GdAl5O12, Y3Al5O12, Y3Al4GaO12, YBO3, Y0.76Gd0.24BO3, YPO4, YSiO5, LaBO3, LaPO4, La2O3, LaAlO3, LuAlO3, La3Al5O12, LaSiO5 and ReP5O14, a sulfide, a fluoride, an oxynitride, an oxysulfide, and an oxyfluoride.

### Claim 7 (depends on 1)

The method of claim 1, wherein the emissive material and/or the emission modifier comprise a lanthanide or a transition metal.

### Claim 8 (depends on 1)

The method of claim 1, wherein the composition comprises substantially spherical particles.

### Claim 9 (depends on 1)

The method of claim 1, wherein the composition has a particle size distribution such that at least about 90 volume percent of the particles are not larger than twice the average particle size.

### Claim 10 (depends on 1)

The method of claim 1, further comprising printing the composition onto the article.