Yamamoto Chemicals, Inc.

Ciba Specialty Chemicals Corporation

Hiroshi Terao

Yojiro Kumagae

Shigeo Fujita

Tsutami Misawa

Kazuhiro Seino

Satoshi Kinoshita

Jun-ichi Taniguchi

Shinichi Nakagawa

Akihiro Kosaka

A phthalocyanine compound represented by the following general formula (I) and the mixture thereof, and an optical recording medium containing the compound/mixture in its recording layer. wherein in formula (I), M is two hydrogen atoms, a divalent metal atom, a mono-substituted trivalent metal atom, a di-substituted tetravalent metal atom, or an oxymetal, and L, L, Land Lare each independently formula (a), formula (b), or formula (c): wherein X, Y, Z and R are defined.

Phthalocyanine compound, process for preparing the same, and optical recording medium containing the same

Phthalocyanine compounds, process for producing the same, and near infrared absorbent comprising the same

A photothermal conversion material showing high sensitivity to the light of a semiconductor laser having an emission frequency band of 750 nm.about.900 nm with a high photothermal conversion efficiency and a planographic original plate fabricated by using the transducer are provided. This photothermal conversion material comprises a phthalocyanine compound of the following general formula (I) ##STR1## wherein R.sub.1 .about.R.sub.8 each represents alkyl or alkoxyalkyl; X.sub.1 .about.X.sub.8 each represents sulfur or NR.sub.9, where R.sub.9 is hydrogen or alkyl.

Photothermal conversion material

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Yao, Japan

Hiroshi Terao