Heat transfer agents in an image-forming composition
AssigneeDatalase Ltd.
InventorsRichard Cook, Martin Walker
Life of this patent
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Abstract
The invention is directed towards a composition comprising: a near-infrared radiation absorbing compound; a colour-forming compound; and a heat transfer agent operable to facilitate heat transfer from the near-infrared radiation absorbing compound to the colour-forming compound; wherein the near-infrared radiation absorbing compound is present in an amount of 0.1-3.5 wt % of the total composition, and the heat transfer agent is present in an amount of 1-15 wt % of the total composition, and the heat transfer agent is present in the composition as solid particles. The invention further relates to substrates comprising the composition applied thereto, as well as methods of forming colour or an image on said substrates.
Claims29
A composition comprising:
- a near-infrared radiation absorbing compound;
- a colour-forming compound;
- and a heat transfer agent operable to facilitate heat transfer from the near-infrared radiation absorbing compound to the colour-forming compound;
- wherein the ratio of near-infrared radiation absorbing compound to heat transfer agent in the laser-reactive composition is 1:1 to 1:100, and the heat transfer agent is present in the composition as solid particles, and
- wherein the heat transfer agent is selected from a metal oxide, a metal pyrophosphate, and a metal phosphate,
- wherein the heat transfer agent has a D50 particle size distribution value of 5 μm or less,
- wherein the composition further comprises one or more binder and carrier component, and
- wherein the one or more binder and carrier component has a glass transition temperature of from −60 to 120° C.
Dependencies are inferred from the claim text.