Method of forming an image on a substrate
AssigneeDatalase Ltd.
InventorsAnthony N Jarvis, Christopher Anthony Wyres, William Green, Martin Robert Walker
Life of this patent
Estimating the term…
Abstract
A method of forming an image on a substrate by applying energy, involves a substrate in or on which there are at least two different color-change agents, i.e. a first color-change agent capable of giving rise to at least two different colors; and a second color-change agent capable of giving rise to at least one different color than achievable with the first color change agent. A preferred embodiment of the invention is a multi-layer laminate comprising, in order, a layer comprising the first agent, a barrier layer, and a layer comprising the second agent.
Claims22
A method of forming an image on a substrate in or on which there are at least two different colour-change agents, wherein the at least two different colour change agents comprise:
- a first colour-change agent that is an activatable diacetylene capable of giving rise to at least two different colours;
- and
- a second colour-change agent that comprises a thermal acid generator and a yellow leuco dye and is capable of giving rise to at least one different colour than achievable with the first colour change agent;
- wherein the method comprises applying energy to the substrate to generate an image,
- wherein the first and second colour-change agents are in different layers on the substrate,
- wherein the at least two different colours to which the first colour-change agent is capable of giving rise comprise blue and red, and
- wherein the second colour-change agent is capable of giving rise to the colour yellow.
A substrate, comprising:
- a first colour-change agent on or in the substrate;
- and a second colour-change agent on or in the substrate,
- wherein the first colour-change agent is an activatable diacetylene capable of giving rise to at least two different colours,
- wherein the second colour-change agent comprises a thermal acid generator and a yellow leuco dye and is capable of giving rise to at least one different colour than achievable with the first colour change agent,
- wherein the second colour-change agent is capable of giving rise to the colour yellow, and
- wherein the first and second colour-change agents are in different layers on the substrate.
A multi-layer laminate comprising, in order, a first layer comprising a first colour-change agent, a second layer of a plastics or other barrier material, and a third layer comprising a second colour-change agent,
- wherein the first colour-change agent is an activatable diacetylene capable of giving rise to at least two different colours,
- wherein the second colour-change agent comprises a thermal acid generator and a yellow leuco dye and is capable of giving rise to at least one different colour than achievable with the first colour change agent,
- wherein the at least two different colours to which the first colour-change agent is capable of giving rise comprise blue and red, and
- wherein the second colour-change agent is capable of giving rise to the colour yellow.
Dependencies are inferred from the claim text.