A thermochromic indicator includes a coating on the substrate. The coating comprising a solid crystalline particles having a melting point of 0-130° C. At temperatures below the melting point, the coating is opaque. At temperatures above the melting point, the coating becomes translucent. The change
A thermochromic indicator includes a coating on the substrate. The coating comprising a solid crystalline particles having a melting point of 0-130° C. At temperatures below the melting point, the coating is opaque. At temperatures above the melting point, the coating becomes translucent. The change in opacity can be reversible or irreversible.
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1. An assembly which comprises (1) a substrate which comprises a temperature-sensitive product, and(2) a temperature indicator which (a) comprises a first component comprising a side chain crystalline (SCC) polymer which (i) has a crystalline melting point, Tp, of 0-135° C., and (ii) is not cross-li
1. An assembly which comprises (1) a substrate which comprises a temperature-sensitive product, and(2) a temperature indicator which (a) comprises a first component comprising a side chain crystalline (SCC) polymer which (i) has a crystalline melting point, Tp, of 0-135° C., and (ii) is not cross-linked(b) undergoes a change in translucency, wherein the change first occurs at a temperature that is less than 5 degrees C. above Tp and wherein the change in the indicator remains when the temperature is reduced below Tp, wherein the SCC polymer is in the form of solid particles having a median particle size greater than 0.03μ and less than 10μ; and(c) comprises a second component, wherein the difference between the refractive index of the SCC polymer and the second component is greater at a temperature below Tp than at a temperature above Tp, wherein the second component comprises air voids or a matrix polymer. 2. An assembly according to claim 1 wherein the SCC polymer is a copolymer of two or more comonomers, and comprises repeating units in which the side chains comprise linear polymethylene radicals containing 16-30 carbon atoms. 3. An assembly according to claim 1 wherein the SCC polymer is a copolymer comprising repeating units containing an n-alkyl group which contains 12, 14, 16 or 18 carbon atoms. 4. An assembly according to claim 1 wherein the SCC polymer is a copolymer which consists essentially of repeating units containing an n-alkyl group which contains 12, 14, 16 or 18 carbon atoms. 5. An assembly according to claim 1 wherein the SCC polymer is a copolymer which consists essentially of units derived from (a) the n-alkyl acrylate in which the n-alkyl group contains 12 carbon atoms and (b) the n-alkyl acrylate in which the n-alkyl group contains 16 carbon atoms. 6. An assembly according to claim 1 wherein the SCC polymer consists essentially of units derived from (I) at least 50% by weight of at least one n-alkyl acrylate or methacrylate in which the n-alkyl group contains 12-50 carbon atoms, and(ii) less than 50% by weight of at least one alkyl acrylate or methacrylate in which the alkyl group is not an alkyl group containing 12-50 carbon atoms. 7. An assembly according to claim 1 wherein the temperature sensitive product is a vaccine and wherein the change in the indicator is in the translucency by heating the assembly above Tp. 8. An assembly according to claim 1 wherein the second component comprises air voids, the indicator further comprising a binder that is a polymer having a Tg at least 10° C. below the Tp of the SCC, wherein the temperature indicator undergoes an irreversible change. 9. An assembly which comprises (1) a substrate which comprises a vaccine, and(2) a temperature indicator which (a) comprises a side chain crystalline (SCC) polymer which (i) has a crystalline melting point, Tp, of 0-135° C.,(ii) is not cross-linked,(ii) is a copolymer of two or more comonomers, and(iv) comprises repeating units in which the side chains comprise linear polymethylene radicals containing 16-30 carbon atoms,(v) has a heat of fusion of at least 20 J/g, and(b) undergoes an irreversible change in translucency when exposed to a combination of time and temperature wherein the change first occurs when exposed to a temperature less than 5 degrees C. greater than Tp, wherein the change is in the translucency of the indicator and the change remains if the temperature is decreased below Tp after the change occurs, wherein the SCC polymer is in the form of solid particles having a median particle size greater than 0.03μ and less than 10μ; and(c) comprises a matrix polymer, wherein the difference between the refractive index of the SCC polymer and the matrix polymer is greater at a temperature below Tp than at a temperature above Tp. 10. An assembly according to claim 9 wherein the SCC polymer is a copolymer which comprises repeating units containing an n-alkyl group which contains 12, 14, 16 or 18 carbon atoms. 11. An assembly according to claim 9 wherein the SCC polymer is a copolymer which consists essentially of repeating units containing an n-alkyl group which contains 12, 14, 16 or 18 carbon atoms. 12. An assembly according to claim 9 wherein the SCC polymer is a copolymer which consists essentially of units derived from the n-alkyl acrylate in which the n-alkyl group contains 12 carbon atoms and the n-alkyl acrylate in which the n-alkyl group contains 16 carbon atoms. 13. An assembly according to claim 9 wherein the SCC polymer consists essentially of units derived from (I) at least 50% by weight of at least one n-alkyl acrylate in which the n-alkyl group contains 12-50 carbon atoms, and(ii) less than 50% by weight of at least one alkyl acrylate in which the alkyl group is not an alkyl group containing 12-50 carbon atoms. 14. An assembly which comprises (1) a substrate which comprises a temperature-sensitive product, and(2) a temperature indicator which (a) comprises a side chain crystalline (SCC) polymer which has a crystalline melting point, Tp, of 0-135° C.,(b) the SCC polymer is in the form of solid particles of a median particle size greater than 0.03μ and less than 10μ, and(c) comprises a matrix polymer, wherein the matrix polymer is a different polymer than the SCC polymer, the refractive index of the SCC polymer is at least 0.03 greater at a temperature below Tp than at a temperature above Tp and the difference between the refractive index of the SCC polymer and the matrix polymer is not more than 0.03 at a temperature below Tp. 15. An assembly according to claim 14 wherein the SCC polymer have a heat of fusion of at least 20 J/g. 16. An assembly according to claim 14 wherein the SCC polymer is a copolymer which consists essentially of units derived from (a) the n-alkyl acrylate in which the n-alkyl group contains 12 carbon atoms and (b) the n-alkyl acrylate in which the n-alkyl group contains 16 carbon atoms. 17. An assembly according to claim 14 wherein the SCC polymer has an average molecular weight of about 10,000 daltons. 18. An assembly according to claim 14 wherein one or both of the particles and the matrix polymer are crosslinked. 19. An assembly according to claim 18 wherein the temperature indicator is a coating on the substrate and the change in opacity is reversible.
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