Irreversible thermochromic ink compositions
AssigneeSanford, L.P.
InventorWing Sum Vincent Kwan
Life of this patent
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Abstract
Disclosed herein are irreversible thermochromic ink compositions including a volatile color activator and a color change dye capable of becoming substantially colorless upon evaporation of the volatile color activator. The volatile color activator and the color change dye can be, optionally, encapsulated. Written marks made with the thermochromic ink compositions can be subjected to a force directing component, which can include generating heat and/or friction, to evaporate the volatile color activator, thereby causing the color change dye to become substantially colorless.
Claims19
An irreversible thermochromic ink comprising:
- a carrier and thermochromic capsules dispersed in the carrier, the thermochromic capsules comprising a shell and a core, the core comprising a volatile color activator and a color change dye capable of becoming substantially colorless upon evaporation of the volatile color activator.
An irreversible thermochromic pigment capsule comprising a shell and a core, the core comprising a volatile color activator and a color change dye capable of becoming substantially colorless upon evaporation of the volatile color activator.
Dependencies are inferred from the claim text.