Back to results
US 11,236,247 B2Granted
Ultraviolet light stable color-changing systems
AssigneeChromatic Technologies, Inc.
InventorsRuizheng Wang, Timothy J. Owen, Qi Wang
Life of this patent
Estimating the term…
Abstract
Disclosed herein are embodiments of (i) a novel stabilizer including a stable nitroxide free radical which can function as a light-stabilizer and/or a heat-stabilizer, and (ii) compositions including the stable nitroxide free radical.
Claims15
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein an amount of said stable nitroxide free radical is not greater than 1 percent by weight of said composition.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said color-changing system is encapsulated within a microcapsule to provide a microencapsulated color-changing system.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said color-changing compound irreversibly changes color.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said color-changing compound reversibly changes color.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said color-changing compound comprises a photochromic compound.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said color-changing compound comprises a thermochromic compound.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said color-changing system is incorporated into a coating comprising an ink.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said stable nitroxide free radical comprises a cyclic stable nitroxide free radical which includes a ring.
5 more elements
A light-stable composition comprising:
- a color-changing system comprising:
- a color-changing compound;
- a solvent;
- and
- a stabilizer which enhances light-stability of said color-changing compound;
- wherein said stabilizer is incorporated into said composition as a stable nitroxide free radical;
- and
- wherein said stable nitroxide free radical comprises the following formula:
- wherein:
- R1 is independently alkyl, or forms a ring together with R2 or R3;
- R2 is independently alkyl, or forms a ring together with R1 or R4;
- R3 is independently alkyl, or forms a ring together with R1 or R4;
- R4 is independently alkyl, or forms a ring together with R2 or R3;
- and
- R5 and R6 are each independently alkyl, or together form a ring.
12 more elements
Dependencies are inferred from the claim text.