Nippon Shokubai Co., Ltd.

Nippon Shobukai Co., Ltd.

Masunori Kitao

Kiyoshi Masuda

Nobuhisa Noda

Takahiro Aoyama

Toshifumi Nishida

Kouichi Hirota

Yukihide Hashimoto

Chie Tateyama

Yukihide Kobe-Okamoto Building No 3 Hashimoto

This invention relates to a method for the production of a halogen-containing phthalocyaline compound by the cyclization of phthalonitrile compounds either singly or in combination with a metal compound, characterized in effecting the cyclization in an organic compound having a hydroxyl group and/or a carboxylic acid in an amount in the range of 0.01-10 mass parts per one mass part of the phthalonitrile compounds while continuing the introduction of an inert gas. This method, by using a solvent capable of serving as a specific oxygen source destined to participate in the reaction of complexing a metal compound introduced into a phthalocyanine dye, permits the production of a phthalocyanine compound inexpensively in a high yield.

Method for production of halogen-containing phthalocyanine compound

A phthalocyanine compound (1) of a specific structure excelling in ability to absorb near infrared, ability to effect selective absorption of near infrared radiation particularly in a wavelength range exceeding 920 nm and falling short of 1050 nm, solubility in a solvent as well, compatibility with resin, and in such characteristic properties as heat resistance, light resistance, and weatherability, and a near infrared absorbing filter characterized by using the phthalocyanine compound (1) and phthalocyanine compound (2) having a maximum absorption wavelength at least in the range of 800&#x2013;920 nm are provided. It enjoys a long service life and permits extensive use without selecting a substrate.

Phthalocyanine compound, method for production thereof, and near infrared absorbing dye and near infrared absorbing filter using same

The present invention is directed to a near-infrared absorbing coat film comprising a near-infrared absorbing dye having a maximum absorption wavelength of 780 nm to 1200 nm, which has a residual near-infrared absorbing capacity of not less than 50% after 48 hours of light irradiation in an accelerated weathering test using a UV Auto Fade Meter.

Near-infrared absorbing coat film and near-infrared absorbing resin composition

A phthalocyanine compound is provided which exhibits particularly high transmittance to a visible ray, offers a highly efficient cut of a near infrared ray, excels in the ability to effect selective absorption in a near infrared region, excels in the solubility in a solvent, excels in the compatibility with a resin, and excels in heat resistance, light resistance, and weatherability, a method for the production thereof, a near infrared absorbable dye using the same, and a heat ray shielding material, a plasma display grade filter and a near infrared absorbable material formed thereof. The phthalocyanine compound of this invention is represented by the following formula (1):

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Ushiku, Japan

Masunori Kitao