Carboxylate and heat-sensitive recording material using same
AssigneesMitsui Toatsu Chemicals, Inc., Yamamoto Chemicals, Inc.
InventorsMansuke Matsumoto, Nobuaki Sasaki, Bunji Sawano, Kiyoharu Hasegawa, Kazuyoshi Kikkawa
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Abstract
A heat-sensitive recording material which has a support and a heat-sensitive recording layer containing at least one carboxylate represented by the following formula (1) or (2) ##STR1## wherein a ring X is an aromatic residue which may have a substitute; the other substituents are as defined herein. The heat-sensitive recording material exhibits excellent color image stability and can provide an optically character-readable sharp image.
Claims16
A heat-sensitive recording material which comprises a support and a heat-sensitive recording layer on the support, said heat-sensitive recording layer containing at least one carboxylate represented by formula (1) or (2) ##STR11## wherein a ring X is an unsubstituted aromatic residue or an aromatic residue substituted with a halogen atom, alkyl group, alkoxy group, aryloxy group, alkylcarbonyl group, arylcarbonyl group, alkylthio group, arylthio group, nitro group, dialkylamino group, amino group, alkylsilyl group, alkylsilyloxy group or trifluoromethyl group;
- A is .dbd.NH or (--OR.sup.3 and --OR.sup.4)(wherein each of R.sup.3 and R.sup.4 is independently an alkyl group having 1 to 8 carbon atoms which is unsubstituted or substituted with an allyloxy group or hydroxy group, and R.sup.3 and R.sup.4 may bond to each other to form a ring);
- R.sup.1 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms which is unsubstituted or substituted with a halogen atom, hydroxy group, alkoxy group having 1 to 4 carbon atoms, aryloxy group, alkylthio group having 1 to 4 carbon atoms, alkoxycarbonyl group having 2 to 20 carbon atoms, amino group or amide group, an aralkyl group which is unsubstituted or substituted with a halogen atom, hydroxy group, alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 4 carbon atoms, alkylthio group having 1 to 4 carbon atoms, amino group, carboxyl group, acyl group or nitro group, or an aryl group which is unsubstituted or substituted with a halogen atom, hydroxy group, alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 4 carbon atoms, alkylthio group having 1 to 4 carbon atoms, amino group, carboxyl group, acyl group or nitro group, but when A is .dbd.NH, R.sup.1 is a residue of benzoic acid, chlorobenzoic acid, hydroxybenzoic acid, anisic acid, toluic acid or nitrobenzoic acid;
- and R.sup.2 is an alkyl group having 1 to 8 carbon atoms which is unsubstituted or substituted with an allyloxy group or hydroxy group.
A heat-sensitive recording material which comprises a support and a heat-sensitive recording layer on the support, said heat-sensitive recording layer containing at least one carboxylate represented by formula (1) or (2) and at least one carbonyl compound having a hydrogen atom at an .alpha.-position and/or at least one aromatic isocyanate compound:
- ##STR12## wherein a ring X is an unsubstituted aromatic residue or an aromatic residue substituted with a halogen atom, alkyl group, alkoxy group, aryloxy group, alkylcarbonyl group, arylcarbonyl group, alkylthio group, arylthio group, nitro group, dialkylamino group, amino group, alkylsilyl group, alkylsilyloxy group or trifluoromethyl group;
- A is .dbd.NH or (--OR.sup.3 and --OR.sup.4)(wherein each of R.sup.3 and R.sup.4 is independently an alkyl group having 1 to 8 carbon atoms which is unsubstituted or substituted with an allyloxy group or hydroxy group, and R.sup.3 and R.sup.4 may bond to each other to form a ring);
- R.sup.1 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms which is unsubstituted or substituted with a halogen atom, hydroxy group, alkoxy group having 1 to 4 carbon atoms, aryloxy group, alkylthio group having 1 to 4 carbon atoms, alkoxycarbonyl group having 2 to 20 carbon atoms, amino group or amide group, an aralkyl group which is unsubstituted or substituted with a halogen atom, hydroxy group, alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 4 carbon atoms, alkylthio group having 1 to 4 carbon atoms, amino group, carboxyl group, acyl group or nitro group, or an aryl group which is unsubstituted or substituted with a halogen atom, hydroxy group, alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 4 carbon atoms, alkylthio group having 1 to 4 carbon atoms, amino group, carboxyl group, acyl group or nitro group;
- and R.sup.2 iS an alkyl group having 1 to 8 carbon atoms which is unsubstituted or substituted with an allyloxy group or hydroxy group.
Dependencies are inferred from the claim text.