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Thermosensitive recording material
| Details |
Inventors: Hiraishi, Shigetoshi; Koike, Naomasa; Kondo, Kazuyoshi; Fuchigami, Mitsuru;
Assignee: Mitsubishi Paper Mills, Ltd. (Tokyo, JP)
Primary Examiner: Hess; Bruce H.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
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. |
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DETAILED DESCRIPTION What is claimed is: 1.
A thermosensitive recording material comprising 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 ##STR11## (wherein R represents a substituted or unsubstituted aralkyl group and said developer is bis(3-allyl-4-hydroxyphenyl)sulfone or combination of bis(3-allyl-4-hydroxyphenyl)sulfone and 3-allyl-4,4'-dihydroxydiphenylsulfone.
2.
A thermosensitive recording material according to claim 1, wherein the sensitizer compound represented by the formula ##STR12## and is 1-benzyloxynaphthalene, 2-benzyloxynaphthalene, 2-p-methylbenzyloxynaphthalene, or 2-p-chlorobenzyloxynaphthalene.
3.
A thermosensitive recording material according to claim 1, wherein the dye precursor is 3-diethylamino-6-methyl-7-anilinofluorane.
4.
A thermosensitive recording material according to claim 1, wherein the dye precursor is a fluorene compound represented by the general formula ##STR13## wherein R.
sub.
1, R.
sub.
2, R.
sub.
3, R.
sub.
4, R.
sub.
5 and R.
sub.
6 represent each a lower alkyl group.
5.
A thermosensitive recording material according to claim 4, wherein the dye precursor is 3,6-bis(dimethylamino)fluorene-9-spiro-3'-(6'-dimethylaminophthalide).
6.
A thermosensitive recording material according to claim 1, wherein the proportion of the sensitizer to the developer is in the range of from 10 to 200% by weight.
7.
A thermosensitive recording material according to claim 6, wherein the proportion of the sensitizer to the developer is in the range of from 20 to 140% by weight.
8.
A thermosensitive recording material according to claim 1, wherein the proportion of the sensitizer to the dye is in the range of from 20 to 500% by weight.
9.
A thermosensitive recording material according to claim 1, wherein a protective layer is provided over the thermosensitive recording layer
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TV Signal 
