| 摘要 |
The present invention provides a color tone correcting agent having suitable heat resistance for use in an optical filter, a novel squarylium compound that is specifically preferable as the color tone correcting agent, and an optical filter including the color tone correcting agent. Specifically, the present invention provides a color tone correcting agent including a squarylium compound represented by the general formula (1), a novel squarylium compound which is represented by the general formula (4) and is preferable as the color tone correcting agent, and an optical filter including the color tone correcting agent. The general formula (1) and (4) are each as defined in the specification. |
| 主权项 |
1. An optical filter, comprising a color tone correcting squarylium compound having general formula (2):wherein
at least one of R10, R11, R12, and R13 is a nitro group, an alkyl group having 1 to 4 carbon atom(s), a halogen-substituted alkyl group having 1 to 4 carbon atom(s), an alkoxy group having 1 to 4 carbon atom(s) or a halogen-substituted alkoxy group having 1 to 4 carbon atom(s), and other is/are each a hydrogen atom, at least one of R14, R15, R16, and R17 is a nitro group, an alkyl group having 1 to 4 carbon atom(s), a halogen-substituted alkyl group having 1 to 4 carbon atom(s), an alkoxy group having 1 to 4 carbon atom(s) or a halogen-substituted alkoxy group having 1 to 4 carbon atom(s), and other is/are each a hydrogen atom, X1 and X2 each represents —CR53R54—, wherein R53 and R54 each represents an alkyl group having 1 to 20 carbon atom(s) optionally substituted by a hydroxyl group, a halogen atom, a cyano group or a nitro group, and Y3 and Y4 each represents a hydrogen atom, an alkyl group having 1 to 20 carbon atom(s) optionally substituted by a hydroxyl group, a halogen atom, a cyano group or a nitro group, an aryl group having 6 to 30 carbon atoms optionally substituted by a hydroxyl group, a halogen atom, a cyano group or a nitro group, or an arylalkyl group having 7 to 30 carbon atoms optionally substituted by a hydroxyl group, a halogen atom, a cyano group or a nitro group, wherein the methylene group(s) in the alkyl groups and arylalkyl groups in the Y3 and Y4 may be interrupted by —O—, —S—, —CO—, —COO—, —OCO—, —SO2—, —NH—, —CONH—, —NHCO—, —N═CH— or —CH═CH—.
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