PHTHALIDE COMPOUND, AND NEAR-INFRARED ABSORBENT AND RECORDING MATERIAL COMPRISING THE SAME

Japanese Patent JP3271226

B2

PURPOSE: To obtain a phthalide compound which, when reacted with a developer, comes to have sufficient absorption in a nearinfrared region but have no or little absorption in the visible region by reacting an ethylene compound with a benzoic acid derivative in the presence of a dehydration/condensation agent.
CONSTITUTION: An ethylene compound represented by formula I is reacted with a benzoic acid derivative represented by formula II in the presence of a dehydration/condensation agent to obtain a desired phthalide compound represented by formula III. In the formulae, A is a substituent represented by formula IV (wherein R1 is H, an alkyl, an alkoxy, or a halogen atom and n is 1-3); B is a substituent represented by formula V; R2 is an alkyl or aryl; R3 is an alkyl; R4 and R5 each is an alkyl or an optionally substituted phenyl; R6 is H, an alkyl, or an alkoxy; and B' is a substituent represented by formula VI. A near-infrared absorbent comprising this phthalide compound and a recorded image formed on a recording material containing the compound show intense absorption in a near-infrared region but show little absorption in the visible region. Although this absorbent looks colorless or lightly colored, it has a high ability to absorb near-infrared light.

Hiroyuki Sasaki
Shinzo Nawamoto
Junichi Taniguchi
Toshihiro Masaoka
Bunji Sawano
Sayuri Wada
Yojiro Kumagai

JP14567394A

April 02, 2002

June 03, 1994

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Yamamoto Kasei Co., Ltd.

B41M3/14; B41M5/145; B41M5/327; B41M5/337; B41M5/46; C07D405/06; C09B11/00; C09K9/02; G11B7/244; (IPC1-7): C09B11/00; C07D405/06; C09K9/02; G11B7/24

JP4158084A
JP5194504A
JP69890A
JP51121037A
JP3149264A
JP6179843A
JP9263704A
JP6179827A
JP693194A

Hiroshi Morioka

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