The present disclosure relates to microcapsules that include a shell material and a core material. The core material of the microcapsules contains an environmentally sensitive luminescent colorant which exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a
The present disclosure relates to microcapsules that include a shell material and a core material. The core material of the microcapsules contains an environmentally sensitive luminescent colorant which exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a time for luminescence decay, one or more of the characteristics capable of changing upon exposure to a given environment, and a luminescent standard which exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a time for luminescence decay, one or more of the characteristics do not change upon exposure to said given environment.
대표청구항▼
1. Microcapsules comprising a shell material;a core material, wherein said core material includes:i) an environmentally sensitive luminescent colorant present in the range of 1 ppm to 50 ppm which exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a time f
1. Microcapsules comprising a shell material;a core material, wherein said core material includes:i) an environmentally sensitive luminescent colorant present in the range of 1 ppm to 50 ppm which exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a time for luminescence decay, one or more of said characteristics capable of changing upon exposure to a given environment;ii) a luminescent standard present in the range of 1 ppm to 50 ppm which exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a time for luminescence decay, one or more of said characteristics do not change upon exposure to said given environment and wherein said luminescent standard is selected from one or more of the following: sulfonated coumarin dyes, sulfonated rhodamine dyes, sulfonated xanthene dye, sulfonated cyanine dyes, and quantum dots; andiii) an ingredient, wherein said ingredient includes one or more of the following: pharmaceuticals, flavorants, or attractants and wherein said environmentally sensitive luminescent colorant has a first rate of oxidation correlated with a second rate of oxidation of said ingredient; andiv) a hydrocarbon solvent; andone or more layers formed on the microcapsule surface selected from the group consisting of polyanions, polycations and combinations thereof,wherein said environmentally sensitive luminescent colorant and said luminescent standard are measurable through said shell without rupturing said microcapsules. 2. The microcapsules of claim 1, wherein said emitted wavelength bandwidth of said environmentally sensitive luminescent colorant is capable of changing or shifting in the range of +/−50 nm. 3. The microcapsules of claim 1, wherein said peak intensity for emission of said environmentally sensitive luminescent colorant is capable of shifting in the range of +/−50 nm. 4. The microcapsules of claim 1, wherein said time for decay of said environmentally sensitive luminescent colorant is capable of changing within +/−5 seconds. 5. The microcapsules of claim 1, wherein said environmentally sensitive luminescent colorant exhibits a first excitation wavelength λexc and said luminescent standard exhibits a second excitation wavelength λexs, and said environmentally sensitive luminescent colorant exhibits a first emission wavelength λemc and said luminescent standard exhibits a second wavelength λems which are different. 6. The microcapsules of claim 1, wherein said environmentally sensitive luminescent colorant and said luminescent standard exhibit a Hildebrand solubility values (δ) that are within +/−2.0 units of one another, as measured in (MPa)1/2. 7. A method of forming microcapsules, comprising: mixing a hydrocarbon solvent, an environmentally sensitive luminescent colorant, a luminescent standard, and an ingredient wherein said ingredient includes one or more of the following: pharmaceuticals, flavorants, or attractants to form a core material, wherein said environmentally sensitive luminescent colorant exhibits characteristics of i) an emitted wavelength bandwidth, ii) a peak intensity for emission and iii) a time for luminescence decay, one or more of said characteristics capable of changing upon exposure to a given environment and wherein said environmentally sensitive luminescent colorant has a first rate of oxidation correlated with a second rate of oxidation of said ingredient and said luminescent standard exhibits characteristics of i) an emitted wavelength bandwidth, ii) a peak intensity for emission and iii) a time for luminescence decay, one or more of said characteristics do not change upon exposure to said given environment and said luminescent standard is selected from one or more of the following: sulfonated coumarin dyes, sulfonated rhodamine dyes, sulfonated xanthene dye, sulfonated cyanine dyes, and quantum dots; andencapsulating said core material in a shell material forming microcapsules by complex coacervation; andforming one or more layers on the microcapsule surface selected from the group consisting of polyanions, polycations and combinations thereof using layer by layer formation, wherein said environmentally sensitive luminescent colorant is present in the range of 1 ppm to 50 ppm and said luminescent is present in the range of 1 ppm to 50 ppm and said environmentally sensitive luminescent colorant and said luminescent standard are measurable through said shell without rupturing said microcapsules. 8. The method of claim 7, wherein said emitted wavelength bandwidth of said environmentally sensitive luminescent colorant is capable of changing or shifting in the range of +/−50 nm. 9. The method of claim 7, wherein said peak intensity for emission of said environmentally sensitive luminescent colorant is capable of shifting in the range of +/−50 nm. 10. The method of claim 7, wherein said time for decay of said environmentally sensitive luminescent colorant is capable of changing within +/−5 seconds. 11. The method of claim 7, wherein said environmentally sensitive luminescent colorant exhibits a first excitation wavelength λexc and said luminescent standard exhibits a second excitation wavelength λexs, and said environmentally sensitive luminescent colorant exhibits a first emission wavelength λemc and said luminescent standard exhibits a second wavelength λems which are different. 12. The method of claim 7, further comprising cross-linking said shell material. 13. The method of claim 7, further comprising soaking said microcapsules in clay. 14. The method of claim 1, wherein said luminescent standard and said luminescent colorant have Hildebrand solubility parameter values (δ) that are within +/−2.0 units of one another, as measured in (MPa)1/2. 15. A method of identifying changes in a core material in a microcapsule due according to claim 1, to environmental exposure comprising: (i) providing microcapsules including a core material whose environmental sensitivity is to be monitored, said microcapsule containing an environmentally sensitive luminescent colorant exhibiting a first set of luminescent characteristics and an environmentally insensitive luminescent standard exhibiting a second set of luminescent characteristics;(ii) measuring the first and second set of luminescent characteristics of the microcapsules at a time t0 and t1 in a given environment;(iii) examining the difference between the first and second sets of luminescent characteristics of said environmentally sensitive luminescent colorant and said luminescent standard;(iv) identifying a change in said core material associated with the difference in luminescent characteristics identified in step (iii). 16. The method of claim 15, wherein said environmentally sensitive luminescent colorant exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a time for luminescence decay, one or more of said characteristics capable of changing upon exposure to a given environment and said luminescent standard exhibits characteristics of an emitted wavelength bandwidth, a peak intensity for emission and a time for luminescence decay, one or more of said characteristics not changing upon exposure to said given environment. 17. The method of claim 15, wherein said environmentally sensitive luminescent colorant exhibits a first excitation wavelength λexc and said luminescent standard exhibits a second excitation wavelength λexs, and said environmentally sensitive luminescent colorant exhibits a first emission wavelength λemc and said luminescent standard exhibits a second wavelength λems which are different. 18. A method of identifying changes in an ingredient within a core material in a microcapsule according to claim 1, due to environmental exposure comprising: (i) providing microcapsules including a core material and an ingredient whose environmental sensitivity is to be monitored, said microcapsule containing an environmentally sensitive luminescent colorant exhibiting a first set of luminescent characteristics and an environmentally insensitive luminescent standard exhibiting a second set of luminescent characteristics;(ii) measuring the first and second set of luminescent characteristics of the microcapsules at a time t0 and t1 in a given environment;(iii) examining the difference between the first and second sets of luminescent characteristics of said environmentally sensitive luminescent colorant and said luminescent standard;(iv) identifying a change in said ingredient associated with the difference in luminescent characteristics identified in step (iii).
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이 특허에 인용된 특허 (5)
Foris Peter L. (Appleton WI) Brown Robert W. (Appleton WI) Phillips ; Jr. Paul S. (Appleton WI), Capsule manufacture.
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