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US 12,545,045 B2Granted
Direct thermal recording media with diarylurea combinations for oil resistance
AssigneeAppvion, Inc.
InventorMark R. Fisher
Life of this patent
Estimating the term…
Abstract
Non-phenolic direct thermal recording media have a thermally responsive layer containing a leuco dye and a plurality of diarylurea acidic developers selected to improve the quality and readability of the image produced in such media, particularly after being contacted with oils such as vegetable oil. The diarylurea developers preferably include, or consist essentially of, or consist of, N,N′-diphenylurea (“DPU”) and a derivative of DPU. An exemplary combination is DPU together with a developer known commercially as TGMD.
Claims9
A recording medium, comprising:
- a substrate;
- a thermally responsive layer carried by the substrate, the thermally responsive layer include a leuco dye and a plurality of developers;
- wherein the recording medium is substantially phenol-free;
- a basecoat between the thermally responsive layer and the substrate, wherein the basecoat comprises hollow sphere pigments;
- and
- wherein the plurality of developers include N,N′-dipvneylurea (“DPU”) and a derivative of DPU having the structure
- and
- wherein the DPU and the derivative of DPU are present in the thermally responsive layer in a relative weight ratio of DPU/derivative of DPU that falls within a range from 40/60 to 50/50.
5 more elements
A recording medium, comprising:
- a substrate;
- a thermally responsive layer carried by the substrate, the thermally responsive layer including a leuco dye and a plurality of developers consisting essentially of N,N′-diphenylurea (“DPU”) and a derivative of DPU in a relative weight ratio of DPU/derivative of DPU from 40/60 to 50/50;
- and
- a basecoat between the thermally responsive layer and the substrate, wherein the basecoat comprises hollow sphere pigments;
- wherein the derivative of DPU has the structure
- and
- wherein the recording medium is substantially phenol-free.
4 more elements
Dependencies are inferred from the claim text.