Squarylium-metal chelate compounds and optical recording media

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making

Reexamination Certificate

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C430S945000, C428S064800, C369S284000, C369S288000

Reexamination Certificate

active

10776973

ABSTRACT:
Squarylium-metal chelate compounds as recording materials for optical recording media, and optical recording media using these compounds, which have excellent recording properties, light resistance and storage stability. The squarylium-metal chelate compound is represented by following Structural Formulas (1) and (2):In the formula (1), M represents a metal atom capable of coordinating; “a”, “b” and “c” each represents a squarylium dye ligand of formula (2), where “a” is different from “b”; and “c” may be the same as or different from “a” or “b”; and “m” represents 0 or 1. In the formula (2), R1and R2are the same or different and each represents an alkyl group, aralkyl group, aryl group or heterocyclic group, each of which may be substituted; and X represents an aryl group which may be substituted, a heterocyclic group which may be substituted, or Z3=CH—, wherein Z3represents a heterocyclic group which may be substituted.

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