The present invention relates to a thermosensitive recording material and, specifically, to a thermosensitive recording material comprising: a colorless or light-colored leuco dye; a compound of chemical formula (1) containing a non-phenolic sulfonyl urea group as a developer; at least one of general formulas II-1, II-2, and II-3 as a sensitizer; a binder; and other fillers. The thermosensitive recording material of the present invention improves the background blurring of a color-developed image by using a non-phenolic developer and exhibits excellent effects in view of color development sensitivity, water resistance, oil resistance, plasticizer resistance, and the like.

A color laser markable article includes at least a first and a second laser markable layer including, respectively, a first infrared dye IR-1 having an absorption maximum in the infrared region .sub.max(IR-1) and a second infrared dye IR-2 having an absorption maximum in the infrared region .sub.max(IR-2), characterized in that the color laser markable layers further include a Diffusion Hindered Molecular Assembly (DHMA) which contains a leuco dye.

A laser markable composition includes (a) an aqueous medium; (b) a leuco dye; (c) an optothermal converting agent; and (d) a color developing agent, characterized in that the color developing agent is a polymer particle capable of forming an acid upon exposure to heat.

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.

A heat-sensitive recording material includes a heat-sensitive recording layer containing a basic dye and a developer and provided on a supporting body, in which the developer is at least one type of an N-substituted amino acid derivative represented by the following General Formula: (RX).sub.mY(Z).sub.m . . . (1) (In Formula (1), R represents an alkyl group or an aryl group which may have a substituent. X is a group bonded to the N-terminus of Y, and represents OCO, SO.sub.2NHCO, NHCO, NHCS, or SO.sub.2. Y represents an amino acid residue or a peptide residue. Z represents a group bonded to the C-terminus of Y and represents an OH group or an OR group. When Y is an amino acid residue other than a cystine residue or when Y is a peptide residue not having a cystine residue, m=1, and when Y is a peptide residue having n cystine residues, m=n+1 and n is 1 or 2.)

A reversible recording medium according to an embodiment of the present disclosure includes: a recording layer including a coloring compound having an electron-donating property, a color developing/quenching agent having an electron-accepting property, a photothermal conversion agent, and a macromolecular material; and an ultraviolet absorbing layer provided on the recording layer, the macromolecular material including an organic material that has solubility of 20 wt % or more and 80 wt % or less at 25? C. or less and contains 0.5 wt % or less of chlorine atoms, fluorine atoms, and sulfur atoms in a molecule.

The purpose of the present invention is to provide a heat-sensitive recording material having improved thermal responsiveness and improved storage stability of a printed area and background, compared to conventional heat-sensitive recording materials containing a non-phenolic compound as a color developer. The present invention pertains to a heat-sensitive recording composition containing a color former, a color developer, a sensitizer, and a stabilizer, wherein the color developer is [3-(3-phenylureido)phenyl]=4-methylbenzenesulfonate, N-[2-(3-phenylureido)phenyl]benzenesulfonamide, or N-(p-toluenesulfonyl)-N-(3-p-toluenesulfonyloxyphenyl)urea, the sensitizer is diphenylsulfone or 1,2-bis(3-methylphenoxy)ethane, and the stabilizer is 1,3-diphenylurea.

A heat-sensitive recording material includes a heat-sensitive recording layer containing a basic dye and a developer and provided on a supporting body, in which the developer is at least one type of an N-substituted amino acid derivative represented by the following General Formula:

(RX).sub.mY(Z).sub.m(1)

(In Formula (1), R represents an alkyl group or an aryl group which may have a substituent. X is a group bonded to the N-terminus of Y, and represents OCO, SO.sub.2NHCO, NHCO, NHCS, or SO.sub.2. Y represents an amino acid residue or a peptide residue. Z represents a group bonded to the C-terminus of Y and represents an OH group or an OR group. When Y is an amino acid residue other than a cystine residue or when Y is a peptide residue not having a cystine residue, m=1, and when Y is a peptide residue having n cystine residues, m=n+1 and n is 1 or 2.)

A thermosensitive recording body has at least a thermosensitive recording layer and a topcoat layer formed on a substrate. The substrate consists of a transparent film. At least the thermosensitive recording layer and the topcoat layer includes a diffuse reflection suppressor component that suppresses diffuse reflection of light from particles constituting the thermosensitive recording layer and the topcoat layer.

A laser markable composition includes (a) an aqueous medium; (b) capsules composed of a polymeric shell surrounding a core; (c) a colour developing agent or colour developing agent precursor; and (d) an optothermal converting agent; characterized in that the core of the capsule contains a leuco dye.