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Recording material
| Details |
Inventors: Hayakawa, Kunio; Furuya, Hiromi; Shimada, Hisanori; Nakata, Masahiro; Kodera, Kaoru; Oohara, Kouji; Akagi, Nobuo;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Michl; Paul R.
Assistant Examiner: Pezzner; Ashley I.
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A recording material employing at least one leuco dye having formula (I), which is colored when brought into contact with a color developer capable of inducing color formation in the leuco dye: ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted or substituted aryl group, which R.sup.1 and R.sup.2 may form a ring in combination or a morpholine ring through an oxygen atom; R.sup.3 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms or an aralkyloxy group; R.sup.4 and R.sup.5 each represent an alkyl group having 1 to 4 carbon atoms; and R.sup.6 represents hydrogen, an alkyl group having 1 to 4 carbon atoms or a halogen. |
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DETAILED DESCRIPTION What is claimed is: 1.
A recording material comprising at least one leuco dye having formula (I), which is colored when brought into contact with a color developer capable of inducing color formation in the leuco dye: ##STR55## wherein R.
sup.
1 and R.
sup.
2 each represent an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group, an aralkyl group which may have a substituent, or an aryl group which may have a substituent, which R.
sup.
1 and R.
sup.
2 in combination may form a ring or a morpholine ring through an oxygen atom; R.
sup.
3 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms or an aralkyloxy group; R.
sup.
4 and R.
sup.
5 each represent an alkyl group having 1 to 4 carbon atoms; and R.
sup.
6 represents hydrogen, an alkyl group having 1 to 4 carbon atoms or a halogen.
2.
The recording material as claimed in claim 1, wherein said aralkyl group represented by R.
sup.
1 or R.
sup.
2 is a benzyl group.
3.
The recording material as claimed in claim 1, wherein said aralkyl group represented by R.
sup.
1 or R.
sup.
2 is a phenethyl group.
4.
The recording material as claimed in claim 1, wherein said substituent of said aralkyl group represented by R.
sup.
1 or R.
sup.
2 is an alkyl group having 1 to 4 carbon atoms.
5.
The recording material as claimed in claim 1, wherein said aryl group represented by R.
sup.
1 or R.
sup.
2 is a phenyl group.
6.
The recording material as claimed in claim 1, wherein said substituent of said aryl group represented by R.
sup.
1 or R.
sup.
2 is an alkyl group having 1 to 4 carbon atoms.
7.
The recording material as claimed in claim 1, wherein said substituent of said aryl group represented by R.
sup.
1 or R.
sup.
2 is a dialkylamino group.
8.
A thermosensitive recording material comprising a substrate and a thermosensitive coloring layer formed thereon comprising at least one leuco dye having formula (I), which is colored when brought into contact with a color developer capable of inducing color formation in the leuco dye: ##STR56## wherein R
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