Yamamoto Chemicals, Inc.

Mitsui Toatsu Chemicals, Incorporated

Nobuaki Sasaki

Shigeo Fujita

Keiki Chichiishi

Mansuke Matsumoto

Yasuhisa Iwasaki

Bunji Sawano

Kiyoharu Hasegawa

Kazuyoshi Kikkawa

Sayuri Wada

Kenichiro Horiuchi

Toshihiko Kawabata

The invention provides novel compounds useful as intermediates for the production of polymethine compounds containing a desired counter ion with high purity and in high yields. Thus provided are polymethine ether compounds of the general formula (I) given below and a method of producing polymethine compounds which comprises bringing those compounds into contact with an acid. In the above formula, R represents an alkyl group, an alkoxyalkyl group or an aryl group which may optionally be substituted, Rand Reach independently represents a hydrogen atom, halogen atom, nitro group, alkyl group, alkoxyalkyl group, alkoxy group or alkoxyalkoxy group and Rand Rmay be bound to each other to form a ring; Rrepresents an alkyl group, which may optionally be substituted; L is an alkylene group required for the formation of a ring structure; and X represents a hydrogen atom, halogen atom, alkoxy group, aryloxy group, alkylthio group, arylthio group or substituted amino group.

Polymethine ether compounds

Polymethine ethers

The invention provides near infrared absorbing materials showing high light-to-heat conversion efficiency and high sensitivity to lasers whose emission bands are within the range of 750 nm to 900 nm, original plates for direct printing plate making, and novel compounds which can be applied to such absorbing materials and plates. The compounds are polymethine compounds of the general formula (I) A detailed description of general formula (I) may be found in the specification.wherein Rrepresents an alkoxy group which may be substituted; Rrepresents an alkyl group which may be substituted; Rand Reach represents a lower alkyl group or Rand Rtaken together represent a ring; X represents a hydrogen atom, a halogen atom or a substituted amino group; Y represents an alkoxy group which may be substituted or an alkyl group which may be substituted; Z represents a charge neutralizing ion.

Polymethine compounds, method of producing same, and use thereof

Polymethine compound and near-infrared absorbing material comprising same

The invention provides near infrared absorbers showing high light-to-heat conversion efficiency and high sensitivity to laser beams whose emission region is within the range of 750 nm to 900 nm, plates for direct printing plate making, and novel compounds which can be used in such absorbers or plates. The compounds are polymethine compounds of the general formula (I) shown below and the near infrared absorbers comprise the polymethine compounds.

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 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

Yao, Japan

Nobuaki Sasaki