Reverse photochromic inks including encapsulated reverse photochromic colorants, and associated methods and writing instruments
AssigneeSanford, L.P.
InventorKenneth Czaplewski
Life of this patent
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Abstract
Reverse photochromic ink formulations containing encapsulated reverse photochromic colorant, methods of erasing reverse photochromic ink formulations including encapsulated reverse photochromic colorants by exposing them to UV light, and writing instruments including a writing tip portion connected to a light-shielding tubular member or refill and a reverse photochromic ink formulation including encapsulated reverse photochromic colorant are provided herein.
Claims19
An ink formulation comprising a reverse photochromic colorant encapsulated in a plurality of capsules, wherein the plurality of capsules are formed of one or more UV absorbers.
A method of erasing ink comprising:
- disposing an ink formulation comprising a reverse photochromic colorant encapsulated in a plurality of capsules on a surface, wherein the plurality of capsules are formed of one or more UV absorbers;
- rupturing at least a portion of the plurality of capsules;
- and
- exposing the surface to UV light, wherein the rupturing at least a portion of the plurality of capsules occurs before exposing the surface to UV light.
A method of erasing ink comprising:
- disposing an ink formulation comprising a reverse photochromic colorant encapsulated in a plurality of capsules on a surface, wherein the plurality of capsules are formed of one or more UV absorbers;
- and
- exposing the surface to UV light,
- wherein, after exposing the surface to UV light, the surface has a ΔE* value of from about 1 to about 20, a ΔL* value of from about 0.1 to about 3, a Δa* value of from about +/−0.5 to about +/−2, a Δb* value of from about +/−0.5 to about +/−5, or any combination thereof.
Dependencies are inferred from the claim text.