Abstract: An image recording medium is disclosed which comprising: an acid generating agent capable of generating an acid by the action of heat or an acid, which is represented by the following formula (1); and a compound of causing variation in the absorption region of from 360 to 900 nm by the intramolecular or intermolecular reaction triggered by the action of an acid:

Abstract: The present invention discloses a laser ablative recording material which has one or more layers including a coloring agent layer on a surface of a support, wherein at least one layer from among one or more layers including the coloring agent layer contains nitric acid ester of carboxyalkyl cellulose having a degree of nitric ester group substitution per glucose anhydride unit within a range of from 0.05 to 2.8; and at least one layer from among one or more layers including the coloring agent layer contains a material having absorption in the laser wavelength region. The laser ablative recording material of the invention is characterized by a small Dmin and a high removing efficiency of the image forming dyes.

Abstract: A thermal recording medium comprising a ultraviolet absorber precursor represented by formula (1-A) or an image forming compound changing hue and an acid, which is high in thermal sensitivity, recordable with such a low output laser that no ablation takes place even when a thermal heat mode image recording system using a laser is utilized, requiring no different receiving sheet, and excellent in keeping quality: wherein P represents a protecting group for a hydroxyl group which is deblocked by heating to 250° C. or less in the presence of an acid; R1 and R2, which may be the same or different, each represents a substitutable group; and 1 and m each represents an integer of 0 to 4.

Abstract: Disclosed is a leuco dye in which a hydrogen atom capable of transferring by isomerization in a dye represented by formula (1) or a tautomer thereof is substituted by a substituent group P which can be removed by the action of heat or acid ##STR1## wherein (A) represents an atomic group necessary for forming a nitrogen-containing hetero ring; (B) represents an atomic group necessary for forming a six-membered hetero ring; and X represents an oxygen atom, a sulfur atom or a nitrogen atom, which may have a hydrogen atom or a possible substituent group.

Abstract: An image recording medium is disclosed which comprising: an acid generating agent capable of generating an acid by the action of heat or an acid, which is represented by the following formula (1); and a compound of causing variation in the absorption region of from 360 to 900 nm by the intramolecular or intermolecular reaction triggered by the action of an acid:W.sup.1 OP (1)wherein W.sup.1 represents a residue of an acid represented by W.sup.1 OH, and P represents an acid-sensitive substituent capable of splitting off at a temperature of 150.degree. C. or less due to catalysis by W.sup.1 OH.

Abstract: A thermal recording medium comprising a ultraviolet absorber precursor represented by formula (1-A) or an image forming compound changing hue and an acid, which is high in thermal sensitivity, recordable with such a low output laser that no ablation takes place even when a thermal heat mode image recording system using a laser is utilized, requiring no different receiving sheet, and excellent in keeping quality: ##STR1## wherein P represents a protecting group for a hydroxyl group which is deblocked by heating to 250.degree. C. or less in the presence of an acid; R.sup.1 and R.sup.2, which may be the same or different, each represents a substitutable group; and 1 and m each represents an integer of 0 to 4.

Abstract: Disclosed is a method for producing aromatic amine derivatives in a high yield at a low price, which comprises inducing an aromatic hydroxamic acid derivative to undergo a rearrangement reaction under a mild condition in the presence of a base and a nitrile or a nitrile equivalent.

Abstract: A silver halide color photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer formed on a support wherein the light-sensitive material contains a compound represented by the following general formula (I): ##STR1## wherein A is a coupler residual or an oxidation-reduction group, X.sub.1 is an oxygen atom or a sulfur atom, X.sub.2 is an oxygen atom, a sulfur atom or NX.sub.6 group, W is a carbon atom or a sulfur atom, X.sub.3, X.sub.4, X.sub.5 and X.sub.6 are each a hydrogen atom or an organic residual, any two of X.sub.3, X.sub.4 and X.sub.5 can be bivalent groups which form a ring, PUG is a photographically useful group capable of bonding at a hetero-atom and, in the formula (I), n.sub.1 is 1 if W is a carbon atom, and either 1 or 2 if W is a sulfur atom. If n.sub.1 is 2, two X.sub.1 can either be identical or different. On the other hand, n.sub.2 is either 1 or 2. If n.sub.2 is 2, two X.sub.3, two X.sub.4, and two x.sub.5 are either identical or different.