Abstract: A temperature history indicator and its manufacturing method wherein the indicators are formed as chips, labels, tags or the like and accompanied with those goods or their packings which must be stored at a certain temperature or lower and when their storage temperature rises higher than the certain temperature over a not-permissible time period, this fact can be visibly shown by development or change of color caused by chemical matters in the indicator, characterized in that when temperature rises higher than a certain value, a hydrophobic organic compound enclosed in microcapsules melts and diffuses causing a dye-precursor and a color developer, which are prepared independently of the compound, to be contacted with each other to irreversibly achieve color development or change, that this color development or change system is rendered operative when the temperature rise continues to exceed a permissible time period, and that when the tops of the color development or change systems are coated with a transpare

Abstract: A thermosensitive recording sheet having a thermosensitive color developer layer containing a basic leuco dye and an organic color developer, said layer containing a compound of the formula ##STR1## as a sensitizer.

Abstract: An improved thermally-responsive record material having improved image retention is disclosed. The invention is an improved thermally-responsive record member, typically a sheet material, bearing a thermally-responsive color-forming composition comprising a chromogenic material, an acidic developer material, and a metal salt of a compound of the formula ##STR1## wherein M is a metal selected from Zn, Ca, Sn, Ni, Cu, Al, Co, and Mg; wherein m corresponds to the valency of M;wherein n is 1 to 3;wherein R.sup.1 is selected from hydrogen, halogen, alkyl, oxyalkyl, or NO.sub.2, with the proviso that the alkyl group is of 1 to 50 carbons;wherein R.sup.2 is selected from hydrogen, alkyl, or aryl, with the proviso that the alkyl group is of 1-5 carbon; anda suitable binder therefor.

Abstract: The present invention provides a novel bis(phenoxymethyl)benzene derivative or bis(naphthoxymethyl)benzene derivative, which improves the stability of image on a heat sensitive recording paper composed of a leuco dye and a developer.

Abstract: There is disclosed a good thermosensitive recording material, having excellent thermal response and having minimal adhesion to a thermal head, which comprises a support having provided thereon a thermosensitive recording layer comprising:(1) a substantially colorless dye precursor,(2) an electron donating developer capable of developing a color of the dye precursor, and,(3) as an additive, 2-benzyloxynaphthalene and p-benzylbiphenyl in a mixing ratio of 95:5 to 70:30 (by weight).

Abstract: A heat-sensitive recording material comprising a support having thereon a subbing layer mainly composed of a pigment and a binder, and a heat-sensitive coloring layer, wherein the subbing layer and the heat-sensitive recording layer each contains a heat-fusible material having a melting point of at least 50.degree. C.

Abstract: A novel thermosensitive recording sheet having a coated film containing a color-forming lactone compound, an acidic substance and a sensitizer, said sensitizer being an o-hydroxy aromatic acid ester represented by formula ##STR1## wherein R.sub.1 denotes an alkylene group, a cycloalkylene group, an oxyalkylene group, a thioalkylene group, a phenylene group, a xylylene group or a napthylene group, R.sub.2 denotes ##STR2##R.sub.3 denotes ##STR3## in which X denotes a hydroxy group or a hydrogen atom, provided a benzene ring and a naphthalene ring in R.sub.1, R.sub.2 and R.sub.3 may be substituted by a lower alkyl group, a nitro group or a halogen atom.

Abstract: A heat-sensitive recording material is disclosed. The material comprises a support having provided thereon a heat-sensitive color forming layer containing an electron donating dye precursor and an electron accepting compound, said heat-sensitive color forming layer containing at least one compound selected from an aromatic polyether and an aromatic polyester, and an aromatic ether.

Abstract: There is disclosed a thermosensitive recording material improved in thermal response and image retention which comprises a support and, provided thereon, a thermosensitive recording layer containing a generally colorless or slightly colored dye precursor and a developer which, upon being heated, reacts with said dye precursor to develop color, wherein said thermosensitive recording layer contains as sensitizer a compound selected from a group consisting of p-benzylbiphenyl, diaryl esters of adipic acid, ##STR1## (wherein R represents a substituted or unsubstituted aralkyl group, ##STR2## (wherein R.sub.1 and R.sub.2 each represents an alkyl, aralkyl, or aryl group), and ##STR3## and said developer is bis(3-allyl-4-hydroxyphenyl)sulfone.

Abstract: A novel thermally-responsive record material is disclosed which is resistant to image fade from one or more common external challenges including contact with common fats or oils, skin oil, carbonless solvents, plasticizers or high heat and humidity, such as in a 90.degree.F./90% humidity test. The heat-sensitive material of the invention contains a fade resistance imparting ascorbic acid ester of the formula ##STR1## where R.sup.1 is hydrogen or a straight chain or branched chain acyl group of from 9 to 22 carbons inclusive,wherein R.sup.2 is a straight chain or branched chain alkyl group of from 8 to 21 carbons inclusive.

Abstract: A recording material containing the combination of at least one electron-donating colorless dye containing a p-substituted aminophenylindolyl azaphthalide and at least one electron-accepting compound containing an organic acid having at least one phenolic hydroxyl group. The material provides colored images having improved stability.

Abstract: A heat-sensitive recording material containing a special sensitizer in a heat-sensitive recording layer is excellent in thermal response properties and sensitivity.

Abstract: A heat-sensitive recording material is disclosed. The material comprises a neutral paper support having provided on at least one surface thereof a heat-sensitive color forming layer containing a fluoran derivative having an arylamino group at the 2-position and an amine residual group at the 6-position, an electron accepting compound, a hindered phenol derivative and a heat-fusible compound represented by formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, which may be the same or different, each represents a hydrogen atom, an alkyl group, an alkoxy group, a phenyl group or a halogen atom, X represents an oxygen atom or a sulfur atom, and Z represents a divalent group.

Abstract: A recording material is described capable of color formation by the contact of a colorless electron donating dye with an electron accepting compound, wherein the recording material contains a compound represented by formula (I) or (II)Ar.sub.1 XC.sub.n H.sub.2n YC.sub.m H.sub.2m ZAr.sub.2 (I)wherein Ar.sub.1 and Ar.sub.2 each represents an aromatic ring which may contain an oxygen atom or a sulfur atom: Z represents a divalent group selected from the group consisting of --CO-- and --O--; X represents a divalent group selected from the group consisting of --O-- and --S--, and Y represents a divalent group selected from the group consisting of --O--, --S-- and --CO.sub.2 --, provided that Z is --CO--, or X represents a divalent group of --O-- and Y represents a divalent group selected from the group consisting of --CO.sub.2 --, --SO.sub.2 -- and --SO--, provided that Z is --O--; and n and m each represents an integer of from 1 to 6,Ar.sub.1 XC.sub.n H.sub.2n YC.sub.m H.sub.2m YC.sub.n H.sub.2n XAr.sub.

Abstract: A thermosensitive recording sheet having a coated film containing a color-forming lactone compound, an acidic substance and a sensitizer, said sensitizer being a sulfur-containing dibasic acid ester represented by formula (I) ##STR1## wherein n is an integer of 1 to 3, m is an integer of 1 or 2, R.sup.1 and R.sup.2 may be the same or different and each denotes an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group, --C.sub.l H.sub.2l --Ar or --C.sub.l H.sub.2l --CO--AR in which l is an integer of 1 to 8 and Ar denotes an aryl group, provided the alkyl group having 1 to 20 carbon atoms may be substituted by a halogen atom, and the cycloalkyl group, the aryl group and Ar of --C.sub.l H.sub.2l --Ar or --C.sub.l H.sub.

Abstract: A heat-sensitive recording material containing a special sensitizer in a heat-sensitive recording layer formed on a support is excellent in thermal response.

Abstract: A heat-sensitive recording material is disclosed, comprising a support having thereon a subbing layer made of a pigment and a binder as main components and a heat-sensitive color forming layer comprising a color former, a color developer and a heat-fusible substance, which is positioned over the subbing layer, wherein the subbing layer contains an aryl ester derivative or aryl carbonate derivative, having a melting point of 75.degree. C. or above.The heat-sensitive recording material is excellent in dot reproducibility.

Abstract: A heat-sensitive thermal transfer recording sheet having a heat-sensitive color-forming layer formed on a front side of a substrate and a thermal transfer layer formed on the back side of the substrate and comprising (a) an aromatic isocyanate compound and (b) an imino compound and (c) a low melting point substance such as wax has a white background and excellent image storability. By adding an electron donating colorless dye and an electron-accepting compound to the thermal transfer layer, the transfer density can be improved.

Abstract: A pressure-sensitive recording sheet is disclosed. The sheet produces a color image by reaction between a substantially colorless electron donating dye precursor and an electron accepting color developer, wherein a layer containing said electron accepting color developer contains (a) a metal salt of an aromatic carboxylic acid and (b) a zinc salt of dithiocarbamic acid represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.2 each represents an alkyl or aryl group.

Abstract: An improved thermally-responsive record material having improved image retention is disclosed. The invention is an improved thermally-responsive record member, typically a sheet material, bearing a thermally-responsive color-forming composition comprising a chromogenic material, an acidic developer material, and a metal salt of a compound of the formula ##STR1## wherein R.sup.a is selected from --CH.dbd.CH, ##STR2## --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --, --(CH.sub.2).sub.3 --, --CH.sub.2 --CH.dbd.CH--, and --CH.sub.2 --wherein R.sub.1 is selected from hydrogen, halogen, alkyl, oxyalkyl, or NO.sub.2 with the proviso that the alkyl groups are of 1-5 carbons wherein M is a metal selected from Zn, Ca, Sn, Ni, Cu, Al, Co, and Mg.

Abstract: A high sensitivity thermal paper resistant to image erasure is disclosed. The thermal paper has a color-forming composition comprising a chromogenic material, an acidic developer material, a water insoluble polymer consisting of poly .alpha.-methylstyrene or .alpha.-methylstyrene/vinyltoluene copolymer, and a thermal modifier. Preferably the thermal modifier is selected from acetoacet-o-toluidine, diphenoxyethane, phenyl-1-hydroxy-2-naphthoate, diheptadecyl ketone and octadecanamide. The disclosed composition when thermally imaged is surprisingly resistant to image erasure and smearing attributable to fingerprint oils.

Abstract: In a heat-sensitive recording material incorporating a colorless or pale-colored basic dye and a color acceptor which is reactive with the dye to form a color when contacted therewith, the recording material characterized in that (a) as the basic dye are used 100 parts by weight of a specific phthalide derivative of the formula [I] and 20 to 100 parts by weight of a specific black color-forming fluoran derivative of the formula [II], (b) as the color acceptor is used a polyvalent metal salt of an aromatic carboxylic acid and (c) a recording sensitizer is further used, and whereby the resulting record images are at least 0.75 in PCS value at 800 nm.

Abstract: A recording material is described comprising an electron donating colorless dye, an electron accepting compound, and at least one compound represented by formula (I), (II), or (III)Ar.sub.1 O--R--SAr.sub.2 (I)Ar.sub.1 S--R--SAr.sub.2 (II)Ar.sub.1 S--R--X--Ar.sub.2 (III)wherein Ar.sub.1 and Ar.sub.2 each represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic ring, R is a divalent group containing from 1 to 10 carbon atoms, and X represents --COO-- group or ##STR1## group.

Abstract: A heat-sensitive recording material comprising a support having provided thereon a heat-sensitive color-forming layer which contains a colorless or slightly colored electron-donating dye precursor and an electron-accepting compound capable of reacting with the electron-donating dye precursor to form color, wherein the heat-sensitive color-forming layer further contains at least one of the compounds represented by the general formulae (I) to (VI) shown in the specification and at least one of the compounds represented by the general formulae (VIII) to (XII) shown in the specification, or wherein the heat-sensitive color-forming layer further contains about 0.5 wt % to less than about 20 wt %, based on the electron-accepting compound, of the compound represented by the general formula (XIII) shown in the specification. The heat-sensitive recording material obtained provides a high density color image and does not undergo a decrease in heat responsibility and an increase in background fog formation.

Abstract: Disclosed herein is a partially pressure-sensitive recording paper on which an ink has been applied partially, the ink having been prepared by uniformly dispersing microcapsules having a solution of a colorless electron-donating dyestuff as the core material, a thermally melting solid substance and an organic solvent having a mean boiling point of from 250.degree. to 350.degree. C. and a content of aromatic ring carbon of more than 25% while restraining the weight ratio of the solvent to the solid substance and the weight ratio of the solid substance to the microcapsules respectively in a prescribed range.

Abstract: A heat-sensitive record material having on a base sheet a recording layer which comprises a basic colorless chromogenic material and an acceptor in the state of that the colorless chromogenic material is contacted with the acceptor by heating to produce color images. The recording layer comprises at least one phenol compound represented by the following formula (I) together with the colorless chromogenic material and the acceptor, ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 radicals is hydrogen, C.sub.1-8 alkyl or C.sub.5-8 cycloalkyl, but at least one of R.sub.1, R.sub.2 and R.sub.3 radicals is C.sub.5-8 cycloalkyl; and each of R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 radicals is hydrogen or C.sub.1-8 alkyl.

Abstract: A heat-sensitive recording material containing a special sensitizer in a heat-sensitive recording layer is excellent in thermal response and sensitivity.

Abstract: A thermosensitive recording sheet having a coated film containing a color-forming lactone compound, an acidic substance and a sensitizer. The sensitizer is at least one aliphatic carboxylic acid ester represented by the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and each represents an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group, a group of the formula --C.sub.n H.sub.2n --Ar in which n is an integer of 1 to 8 and Ar is an aryl group, or a group of the formula --C.sub.n H.sub.2n --CO--Ar in which n and Ar are as defined; R.sup.3 represents a group of the formula --C.sub.n H.sub.2n --in which n is as defined; R.sup.4 and R.sup.5 are identical or different and each represents an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, a group of the formula --C.sub.n H.sub.2n --Ar in which n and Ar are as defined, or a group of the formula --C.sub.n H.sub.2n --CO--Ar in which n and Ar are as defined; and R.sup.

Abstract: In a heat-sensitive recording material comprising a colorless or pale-colored basic dye and an electron accepting reactant material which is reactive with the basic dye to form a color when contacted therewith, and comprising at least one of the specific phthalide derivatives as the basic dye, the heat-sensitive recording material characterized in that at least one compound selected from the group consisting of the specific fluorene derivatives and the specific p-phenylenediamine derivatives is further contained in the recording material.

Abstract: This invention discloses a heat sensitive recording material having a heat sensitive layer on a support; either of a color forming material or a developer which are contained in the heat sensitive layer is encased in a microcapsule. Since a plasticizer for a wall material of the microcapsule and a compound having an effect to depress the melting point of at least one member out of developers, a color forming reaction is carried out smoothly under a recording condition, therefore, a density of an obtained image is sufficient. Especially good results are obtained when a macromolecule substance selected from a group of polyurethane, polyurea, polyamide, polyester and polycarbonate is used as a wall material of the microcapsule. A coloring reaction assistant may be contained in any place of the heat sensitive layer.A preferable plasticizer can be selected from a group of phenols, alcohols, ureas, sulfonamides, carbamates and aromatic methoxy compounds.

Abstract: There is disclosed a thermosensitive recording material improved in thermal response and image retention which comprises a support and, provided thereon, a thermosensitive recording layer containing a generally colorless or slightly colored dye precursor and a developer which, upon being heated, reacts with said dye precursor to develop color, wherein said thermosensitive recording layer contains as sensitizer a compound selected from a group consisting of p-benzylbiphenyl, diaryl esters of adipic acid, ##STR1## (wherein R represents a substituted or unsubsitituted aralkyl group), ##STR2## (wherein R.sub.1 and R.sub.2 each represents an alkyl, aralkyl, or aryl group), and ##STR3## and said developer is bis(3-allyl-4-hydroxyphenyl)sulfone.

Abstract: A new reversible temperature indicating composition for use in temperature indicating instruments is diclosed which is capable of accurate temperature indication in a variety of colors and characterized by a minimum range of hysteresis so that the marking drawn in this composition can decolor at or close the temperature at which its coloring takes place. In addition, the composition can provide a wide variety of hues and can be readily prepared. These and other advantages are provided by the inclusion as a main ingredient of an ester compound having .DELTA.T value, defined .DELTA.T=melting point--clouding point, in the range under 3.degree. C., the value that determines a desirably small range of hysteresis.

Abstract: A thermosensitive recording material is disclosed, which comprises a support material and a thermosensitive coloring layer formed thereon comprising a leuco dye, a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, and a diether compound having the following general formula (I): ##STR1## wherein R represents a straight or branched hydrocarbon having 2 to 12 carbon atoms, including 1 to 4 double bonds therein, X and Y each represent an alkyl group having 1 to 6 carbon atoms; an alkoxy group having 1 to 6 carbon atoms; halogen; an aryl group; an aralkyl group; an acyloxy group (R'COO--), wherein R' is an alkyl group having 1 to 6 carbon atoms; an aryloxy group; or an aralkyloxy group; and m and n each represent an integer of 1 to 3.

Abstract: A heat sensitive recording sheet including p-benzyloxybenzoic acid benzylester and filler in its color-forming layer which contains a basic colorless or pale-colored chromogenic dyestuff and an organic color-developing agent whereby a heat sensitive recording sheet having a highly stable developed image against oily substances such as hair oil, sweat, etc. is provided without deteriorating the fundamental qualities of the heat sensitive recording sheet.

Abstract: Heat-sensitive recording materials comprising a colorless or light-colored dye precursor and a color developer capable of developing a color of the dye precursor, upon reaction with said dye precursor with heating, further contain as sensitizers specific styryl-containing compounds. By incorporating these specific sensitizers, the heat-sensitive recording materials provide excellent thermal response and high sensitivity.

Abstract: A thermosensitive image transfer medium is disclosed which consists essentially of (i) an image transfer sheet comprising (a) a plastic film, (b) an undercoat layer formed thereon containing a porous filler having an average particle size of 1 to 10 .mu.m and an oil absorption of 200 ml/100 g or less as measured in accordance with the Japanese Industrial Standard K 5101, with a depostion of the porous filler ranging from 1 g/m.sup.2 to 10 g/m.sup.2 and (c) an image transfer layer comprising a leuco dye formed on the undercoat layer, and (ii) an acceptor sheet having an acceptor layer comprising a color developer which is capable of inducing color formation in the leuco dye.

Abstract: In a heat-sensitive and heat-transferable recording sheet comprising a substrate, a heat-sensitive, color-forming layer provided on the front side of said substrate and a heat-transferable layer provided on the back side of said substrate, background fogging can be prevented by allowing the heat-transferable layer to be composed essentially of an electron-donating colorless dye, an electron-accepting compound, a low-melting substance and a desensitizer.

Abstract: A highly sensitive thermal recording material excellent in response to heat is obtained by incorporating as a sensitizer at least one compound into a thermal printing material comprising a usually colorless or light-colored dye precursor and a developer which reacts with each other to develop color on heating, said compound being selected from the following compounds represented by the following general formulas (I), (II) and (III): ##STR1##

Abstract: A recording material is described, containing (A) an electron-donating colorless dye and (B) an electron-accepting compound, wherein the electron-accepting compound is a compound represented by formula (I) ##STR1## wherein R.sup.1 represents an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, or an aryloxyalkyl group, Y.sup.1 is an alkyl group, an alkoxyl group, a halogen atom, or a hydrogen atom, and m is 0, 1 or 2.

Abstract: A heat-sensitive recording material contains, in its heat-sensitive, color-developing layer comprising a leuco dye and an organic acid that reacts with said leuco dye to develop color upon heating, a hydrocarbon compound melting at a temperature in the range from 50.degree. C. to 200.degree. C. and selected from benzylbiphenyls, alkyl-substituted benzylbiphenyls, hydrogenated benzylbiphenyls, hydrogenated alkyl-substituted benzylbiphenyls, hydrogenated terphenyls and hydrogenated alkyl-substituted terphenyls. With its quick thermal response, this material is suitable for high-speed recording.

Abstract: Disclosed is a heat-sensitive color-forming recording material which comprises a recording layer comprising a particulate phenolic color developer and a particulate leuco pigment, which are dispersed in a binder independently from each other, wherein the phenolic color developer and/or leuco pigment is present in the form of compatible solid particles with a substantially inactive organic solid medium having a melting or softening point lower than that of the phenolic color developer and/or leuco pigment and said organic solid medium is present in said compatible solid particles in an amount .[.2 to 250 times as large as.]. .Iadd.of 0.2 to 250% by weight, based on .Iaddend.the amount of the phenolic color developer and/or leuco pigment on the weight base. This heat-sensitized color-forming recording material is highly sensitive without substantial increase of the fog density.