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US 10,759,976 B2Granted
Color changeable adhesives and methods of making such adhesives
AssigneeSensor International, LLC
InventorsGregory L Heacock, Andrew Mills
Life of this patent
Estimating the term…
Abstract
Color changeable materials can be incorporated into adhesive materials while maintaining the efficacy and stability of the indicator. The indicators provide simple, reliable, and cost effective detection means for detecting ammonia and carbon dioxide, and may find use in applications such as food packaging and medical applications.
Claims10
A color changeable adhesive comprising:
- a color changeable material selected from the group consisting of a color changeable pigment, dye, particle coated with a color changeable pigment or dye, or mixture thereof wherein the color changeable material has a pKa of 7.5 to 9.5;
- and
- a pressure sensitive adhesive having a pH that is neutral or alkaline up to a pH equal to or 1.5 greater than the pKa of the color changeable material;
- wherein the pigment, dye or particle is dispersed within the adhesive and wherein the pigment, dye or particle is a carbon dioxide indicator.
1 more element
Dependencies are inferred from the claim text.