Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo

Chiaki Kasada

Shigeo Yasui

Toshio Kawata

Kentaro Yano

Yasushi Aizawa

Katsumi Orita

Yoshie Hata

The present invention provides organic dye compounds having their absorption maxima in a region ranging from the ultraviolet region to a relatively short wavelength visible region and uses thereof. The present invention provides specific monomethine cyanine dyes, light absorbents and optical recording media comprising the monomethine cyanine dyes, and a process for producing the monomethine cyanine dyes which comprises a step of reacting a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having a reactive methyl group with a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having an appropriate leaving group.

Cyanine dyes

The present invention provides styryl dyes which have absorption maxima at a wavelength of 400 nm or less and are sensitive to a laser beam with a wavelength of 450 nm or less, light absorbents and optical recording media which comprise the styryl dyes, and a process for producing the styryl dyes which comprises reacting with an aldehyde compound a quaternary ammonium salt of nitrogen atom containing heterocyclic compound having an active methyl or active methylene group.

Styryl dye

Cyanine dye

The object of the present invention is to provide organic dye compounds which exert satisfactory optical absorption properties and thermal resistance when used in high density optical recording media. The above object is solved by specific trimethine cyanine dyes, light absorbents and optical recording media which comprise the cyanine dyes, and preparations for the cyanine dyes comprising either reacting a benzoindolium compound having a compatible leaving group with a pyrazinoimidazolium compound having a reactive methyl group; or reacting a benzoindolium compound having a reactive methyl group with a pyrazinoimidazolium compound having a compatible leaving group.

The present invention provides organic dye compounds which exert excellent recording characteristics in high-density optical recording media, and uses thereof. The present invention solves the objects of the present invention by providing non-symmetric trimethine cyanine dyes having a specific structure and properties, light absorbents and optical recording media comprising the cyanine dyes, and a process for preparing the cyanine dye comprising a step of reacting either 3,3-dimethyl-5-nitroindolium compounds or 3,3-dimethyl-5-sulfonamideindolium compounds, which have a reactive methyl group or an appropriate leaving group, with 3,3-dimethylbezoindolium compounds, which have a reactive methyl group or an appropriate leaving group.

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Okayama, Japan

Chiaki Kasada