Heat-sensitive recording material

Claim 2

A heat-sensitive recording material comprising a support and a heat-sensitive color forming layer containing a colorless or pale colored electron donating dye precursor and an electron accepting compound that reacts with said dye precursor to develop color, wherein said electron accepting compound is a bishydroxycumylbenzene or bishydroxy-α-methylbenzylbenzene compound.

Claim 3

A heat-sensitive recording material according to claim 1, wherein said colorless or pale colored electron donating dye precursor is a compound represented by formula (V) ##STR16## wherein R 1 and R 2 each represents an alkyl group or cycloalkyl group having from 1 to 10 carbon atoms; R 3 represents an aryl group; X represents an alkyl group having from 1 to 10 carbon atoms or a halogen atom.

Claim 4

A heat-sensitive recording material according to claim 2, wherein said colorless or pale colored electron donating dye precursor is a compound represented by formula (VI) ##STR17## wherein R 1 and R 2 each represents an alkyl group having from 1 to 10 carbon atoms, or R 1 and R 2 combine to form an aliphatic carbocyclic ring; R 3a represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms; and X represents an alkyl group having from 1 to 8 carbon atoms or a chlorine atom.

Claim 5

A heat-sensitive recording material according to claim 1, wherein said heat-sensitive color forming layer contains at least one of the heat-fusible compounds represented by formulae (VII) to (XII) ##STR18## wherein R 4 , R 5 , R 6 , and R 7 each represents a phenyl group, a benzyl group, or a phenyl or benzyl group substituted by a lower alkyl group or a halogen atom; R 8 and R 9 each represents an alkyl group having from 12 to 24 carbon atoms; R 10 represents a hydrogen atom or a phenyl group; and R 11 represents a divalent group; X 1 , Y 1 , Z 1 , X 2 , Y 2 and Z 2 each represents a hydrogen atom, an alkyl group, a lower alkoxy group, a lower aralkyl group, a halogen atom, an alkyloxycarbonyl group, or an aralkyloxycarbonyl group.

Claim 6

A heat-sensitive recording material according to claim 4, wherein the heat-fusible compounds represented by formulae (VII) to (XII) have melting points in a range of from 70° to 150° C.

Claim 7

A heat-sensitive recording material according to claim 4, wherein the heat-fusible compounds of formulae (VII) to (XII) are used in an amount of from 10 to 200 wt% based on the weight of the electron accepting compound.

Claim 8

A heat-sensitive recording material according to claim 1, wherein said heat-sensitive color forming layer contains at least one of the phenolic compounds represented by formulae (XIII) to (XVI) ##STR19## wherein R 12 represents a branched alkyl group having from 3 to 8 carbon atoms; R 13 represents a hydrogen atom or a branched alkyl group having from 3 to 8 carbon atoms; R 14 represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms; R 15 represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms; R 16 , R 17 and R 18 each represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms; R 19 represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms; R 20 and R 22 each represents a branched alkyl group having from 3 to 8 carbon atoms; R 21 and R 23 each represents an alkyl group having from 1 to 8 carbon atoms; X 3 represents S, O, SO 2 , S 2 , ##STR20## a cyclopentylene group, or a cyclohexylene group, wherein n is an integer of 0 to 3, and R 24 and R 25 each represents an alkyl group having from 1 to 8 carbon atoms; R 26 and R 29 each represents a branched alkyl group having from 3 to 8 carbon atoms; R 27 , R 28 , R 30 and R 31 each represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms; Y 3 represents S, O, SO 2 , S 2 , or ##STR21## wherein m is an integer of 0 to 3, and R 32 and R 33 each represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms, or R 32 and R 33 combine to form a cyclic pentamethylene group; and R 34 and R 35 each represents a branched alkyl group having from 3 to 8 carbon atoms; Z 3 represents --NH-- or --O(CH 2 )n--, wherein n is an integer of from 1 to 5; i is an integer of 1 to 4, provided that if i=1, W 1 is an alkyl group having from 1 to 18 carbon atoms, if i=2, W 1 is S, O, or ##STR22## wherein R 36 and R 37 each represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms, and j is an integer of from 0 to 8; if i=3, W 1 is ##STR23## wherein R 38 is a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms; and if i=4, W 1 is ##STR24##

Claim 9

A heat-sensitive recording material according to claim 7, wherein the amount of phenolic compounds repesented by formulae (XIII) to (XVI) is from 5 to 200 wt% based on the weight of the electron accepting compound.

Claim 10

A heat-sensitive recording material according to claim 1, wherein said heat-sensitive color forming layer contains at least one of the compounds represented by formulae (XVII) to (XXI) ##STR25## wherein X 4 represents S, O, SO 2 , S 2 or ##STR26## wherein l is an integer of 0 to 3; R 39 and R 40 each represents a hydrogen atom or an alkyl group having from 1 to 8 carbon atoms, or R 39 and R 40 combine to form a cycloalkyl group; Y 4 represents a hydrogen atom, --CH 3 , or --OH; R 41 represents ##STR27## or a straight chain or branched chain alkyl group having from 1 to 6 carbon atoms, wherein m and n are each an integer of 0 to 3, and Z 4 represents a hydrogen atom, a halogen atom, or --CH 3 ; W 2 represents a hydrogen atom or --OH; R 42 represents a straight chain or branched chain alkylene group having from 1 to 8 carbon atoms; R 43 represents a hydrogen atom, a halogen atom or an alkyl group having from 1 to 8 carbon atoms; R 44 and R 45 each represents an alkyl group having from 1 to 8 carbon atoms; and R 46 represents an alkylene group having from 1 to 5 ether linkages.

Claim 11

A heat-sensitive recording material according to claim 9, wherein the compounds of formulae (XVII) to (XXI) are present in an amount of from 5 to 200 wt% based on the weight of the electron accepting compound.

Claim 12

A heat-sensitive recording material according to claim 1, wherein said electron accepting compound is at least one compound selected from the group consisting of 1,3-bis-p-hydroxycumylbenzene and 1,4-bis-p-hydroxycumylbenzene.