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US 10,118,427 B2Granted
Thermosensitive recording materials containing chelating agents
AssigneeRicoh Company, Ltd.
InventorsLaurence Daudin, Florence Gayrard, Daiki Iwata
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Abstract
The present invention relates to thermal recording materials comprising (in order): a support (base) layer; one or more “undercoat” layers; a thermal layer (thermosensitive coloring layer); and one or more “protective” layers, wherein the thermal recording material contains an aminocarboxylic and/or phosphorus-based chelating agent. The thermal (thermosensitive) recording materials of the invention show enhanced plasticizer resistance and/or preprint uniformity.
Claims10
A thermal recording material comprising:
- a base layer;
- one or more undercoat layers which is/are laid down on the base layer;
- a thermo-sensitive coloring layer which is laid down on the uppermost undercoat layer, on the opposite side with respect to the base layer;
- and
- one or more protective layers which is/are laid down on the thermo-sensitive coloring layer, on the opposite side with respect to the undercoat layer(s),
- wherein one or more of said protective layer(s) and/or said thermosensitive layer contains a chelating agent whose structure is given by following general formula (1):
- wherein R1 is a linear alkyl group of 1 to 8 carbon atoms, optionally substituted with one or more carboxyl groups —CO2M, wherein M is hydrogen, ammonium or substituted ammonium, alkali metal, alkaline earth metal or a combination thereof.
4 more elements
A thermal recording material comprising:
- a base layer;
- one or more undercoat layers which is/are laid down on the base layer;
- a thermo-sensitive coloring layer which is laid down on the uppermost undercoat layer, on the opposite side with respect to the base layer;
- and
- one or more protective layers which is/are laid down on the thermo-sensitive coloring layer, on the opposite side with respect to the undercoat layer(s),
- wherein one or more of the said undercoat layers contains an aminocarboxylic acid chelating agent.
3 more elements
Dependencies are inferred from the claim text.