Abstract: A urea-urethane compound having one or more urea groups and one or more urethane groups in the molecular structure, the number of said urea groups (A) and the number of said urethane groups (B) satisfying the following numerical formula: 10?(A+B)?3 wherein each of A and B is an integer of 1 or more.

Abstract: Silver-free, aqueous-based direct thermographic materials are designed to have image tone with near neutral density. Without the use of organic silver salts containing reducible silver ions, the image is formed using a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., a combination of cyan, yellow and magenta dye-forming color couplers that provide cyan, yellow, and magenta dyes, and a hindered-amine N-oxyl as an oxidizing agent. No silver metal or silver ions are purposely added to these materials. This combination of components provides a means for controlling image tone without reliance upon conventional toning agents.

Abstract: Systems and methods of labeling optical disk recording media using black leuco dyes in an electromagnetic radiation sensitive composition are described. Black leuco dyes containing isobenzofuranone are prepared in various compositions that can include activators, radiation absorbers, non-leuco colorants, and/or a variety of carriers. The leuco dye compositions can be applied and prepared to achieve a desired visual effect upon development of the black leuco dye.

Abstract: According to the present invention, a coloring property-improved novel leuco dye which can develop color by heat even with single molecule without requiring excess developer can be obtained, and an image recording medium having high sensitivity and excellent resolution effected by including the dye and a high sensitivity image recording medium further combined with an acid generator can also be obtained. Particularly, it relates to a leuco dye represented by a formula (1) (LD—(A—P1)n) and to an image recording medium which contains the leuco dye (wherein LD represents an acid-sensitive leuco dye mother nucleus, —A represents the residue of an acidic group (—AH) selected from —SO3H, —CO2H and —P(═O)(OH)xRy, R represents a hydrogen atom or a substituent group, x and y are x=1 and y=1 or x=2 and y=0, P1 represents a protecting group which can be removed by the action of light, heat or acid, and n is an integer of 1 or more).

Abstract: Temperature indicating compositions of dispersions in an aqueous binder of a color changing electron donating compound having a melting point greater than about 300.degree. F. and a polymeric electron accepting resin reactive with the electron donating compound to produce a visible and permanent color change and having a T.sub.g and non-volatility effective to provide a color change to coatings containing the composition upon exposure to a predetermined heat history. Temperature indicating materials are also disclosed containing a support coated on at least one surface thereof with the temperature indicating composition to the present invention.

Abstract: Disclosed are a crystal of a fluoran compound having the formula comprising exhibiting high peaks at diffraction angles (2.theta.) of 7.5.degree. and 17.0.degree. and relatively high peaks at diffraction angles (2.theta.) of 15.1.degree., 19.1.degree., 21.5.degree. and 25.3.degree. in an X-ray diffraction diagram by the CU-K.alpha. beam and a crystal of a fluoran compound having the formula (II) comprising exhibiting high peaks at diffraction angles (2.theta.) of 5.5.degree. and 19.2.degree. in an X-ray diffraction diagram by the CU-K.alpha. beam, which is useful as a color forming compound in recording materials.

Abstract: A single sheet of paper is divided into at least original and copy panels by fold line(s). Information entered on the two, front and back surfaces of the original panel are reproduced on the two surfaces of the copy panel by carbonless copy treatments. In one embodiment, the original panel is fully coated or partially coated with carbonless CB treatment, on both surfaces, and the copy panel is fully coated or partially coated with carbonless CF treatment. In a variation of this embodiment, the original panel is not coated, and the copy panel is coated in selected areas with carbonless SC treatment. In a second embodiment, the original panel is not coated, an image-transferring panel is fully coated on both surfaces with carbonless CB treatment, and the copy panel is fully coated with carbonless CF treatment. In a variation of this embodiment, the image-transferring panel is formed of a separate sheet of paper.

Abstract: A heat-sensitive recording material obtained by coating on a support a composition comprising a microcapsulated colorless or light colored color-forming substance which can develop its color by reaction with an organic base, and an emulsified dispersion prepared by emulsifying an organic base dissolved in an organic solvent insoluble or slightly soluble in water, then drying the coat.

Abstract: A pressure-sensitive recording material is described, comprising an electron-accepting compound, and at least one of electron-donating colorless dyes represented by formula (I) or formula (II) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 each represents a hydrogen atom, a lower alkyl group, a lower alkenyl group, a lower alkoxy group, or a halogen atom; and R.sub.9 and R.sub.10 each represents a hydrogen atom or a lower alkyl group, provided that at least one of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 represents a lower alkyl group or a lower alkenyl group.

Abstract: A thermal imaging method is provided which comprises heating imagewise a di- or triarylmethane compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with a moiety ring-closed on the meso carbon atom directly through a nitrogen atom, which nitrogen atom is also bound to a group with a masked acyl substituent that undergoes fragmentation upon heating to liberate the acyl group for effecting intramolecular acylation of said nitrogen atom to form a new group in the ortho position whereby the di- or triarylmethane compound is rendered colored in an imagewise pattern corresponding to said imagewise heating.

Abstract: A method of thermal imaging is provided which comprises heating imagewise a layer of a colored di- or triarylmethane compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho-position to the meso carbon atom with a group comprising a thermally unstable urea moiety which fragments upon heating to provide a new group that bonds to the meso carbon atom whereby the di- or triarylmethane compound is rendered ring-closed and colorless in an imagewise pattern corresponding to said imagewise heating.

Abstract: A new reversible heat sensitive recording composition for erasable recording is disclosed which is used as a recording or marking material that is capable of erasure at a specific temperature so that coloring or decoloring can be controlled to occur at desired temperature ranges. This range or the hysteresis value of the composition is determined by the .DELTA.T value of the contained ester compound. In addition, the composition can provide a wide variety of hues and can readily be prepared. The marking or recording drawn in this composition can be maintained at room temperature or less.