Pyrazolone compounds and ophthalmic plastic lens using the same
AssigneeHoya Healthcare Corporation
InventorHidetoshi Iwamoto
Life of this patent
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Abstract
Provided are novel pyrazolone compounds which have excellent copolymerizability and undergo no elution in an organic solvent when used for an ophthalmic plastic lens and which have an excellent absorption peak in visible light region and function as a reactive yellow dye.
Claims40
A pyrazolone compound which is a compound of the formula (I),
- wherein X is phenyl or 4-alkylphenyl.
An ophthalmic plastic lens which is a polymerization product from a polymerizable material containing a pyrazolone compound of the formula (1) and a monomer for lens,
- wherein X is phenyl or 4-alkylphenyl.
A process for the production of an ophthalmic plastic lens, which comprises casting a polymerizable material containing a pyrazolone compound of the formula (I) and a monomer for a lens into a mold in the form of a rod, a plate or a lens and polymerizing the polymerizable material,
- wherein X is phenyl or 4-alkylphenyl.
A process for the production of an ophthalmic plastic lens, which comprises casting a polymerizable material containing the pyrazolone compound of the formula (I) and a monomer for a lens into a central hollow portion of a hard polymer material shaped in the form of a doughnut, polymerizing the polymerizable material and then cutting and polishing a polymerizate integrated with said hard polymer material, to form a hard haptic portion and a soft optic portion,
- wherein X is phenyl or 4-alkylphenyl.
Dependencies are inferred from the claim text.