Yamamoto Chemicals, Inc.

Mitsui Toatsu Chemicals, Incorporated

Bunji Sawano

Mansuke Matsumoto

Nobuaki Sasaki

Kiyoharu Hasegawa

Kazuyoshi Kikkawa

Yojiro Kumagae

Hiroyuki Sasaki

Sayuri Wada

Toshihiro Masaoka

Jun-ichi Taniguchi

Shinzo Nawamoto

Kenichiro Horiuchi

Toshihiko Kawabata

The arylsulfonylureide compound which is of value as a color developer is provided in high yield and high purity by a simple procedure. The technology of the invention for producing an arylsulfonylureide compound of general formula (1)

Process for producing arylsulfonylureide compounds

A process for preparing a 3-(N,N-disubstituted amino)phenol is herein disclosed which comprises reacting resorcin with a primary amine represented by formula (2):

Process for preparing 3-(N,N-disubstituted amino)phenol

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.

Carboxylate and heat-sensitive recording material using same

A phthalide compound of general formula (I) and a near infrared absorber and a recording material each utilizing the phthalide compound are disclosed. ##STR1## wherein ring A represents a substituent group of the following formula ##STR2## where the other substituents are as defined in the disclosure. The near infrared absorber and the recorded image on the recording material absorb strongly the near infrared region with no appreciable absorption in the visible region of the spectrum. The near infrared absorber is colorless or pale in color and yet highly capable of absorbing near infrared radiation. The recorded image on the recording material can hardly be read with the eye but can be read with the OCR. Moreover, the effect on the developed shade of any concomitant color former in a recording material is minimal.

Phthalide compound and a near infrared absorber and a recording material

A carboxylate is herein disclosed which is represented by the formula (1) or (2) ##STR1## wherein a ring X is an aromatic residue which may have a substituent; the other substitutents are as defined herein. A heat-sensitive recording material comprising this carboxylate is excellent in the stability of the color image and can provide an optically character-readable sharp color image.

Growing community of inventors

Osaka-fu, Japan

Bunji Sawano