One embodiment according to the present disclosure relates to a spectacle lens comprising a compound represented by formula (1):

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The present invention discloses a dyeable 1.74 resin lens and a preparation method thereof. The resin lens includes a module layer with a refractive index being 1.74, a dyeable layer with a refractive index being 1.60 is poured on an upper surface of the module layer, an upward curved degree of the dyeable layer is the same as an upward curved degree of the module layer, and a center thickness of the dyeable layer is 0.5-1.2 mm. According to the dyeable 1.74 resin lens of the present invention, a layer of dyeable 1.60plus resin lens is attached to a surface of a 1.74 lens, dyeing performance is good, a visible light transmittance can reach 10-30%, and the blank that the 1.74 lens cannot be dyed is filled.

The present invention discloses a dyeable 1.74 resin lens and a preparation method thereof. The resin lens includes a module layer with a refractive index being 1.74, a dyeable layer with a refractive index being 1.60 is poured on an upper surface of the module layer, an upward curved degree of the dyeable layer is the same as an upward curved degree of the module layer, and a center thickness of the dyeable layer is 0.5-1.2 mm. According to the dyeable 1.74 resin lens of the present invention, a layer of dyeable 1.60plus resin lens is attached to a surface of a 1.74 lens, dyeing performance is good, a visible light transmittance can reach 10-30%, and the blank that the 1.74 lens cannot be dyed is filled.

A method for manufacturing a plastic substrate having excellent thickness uniformity, and a plastic substrate having excellent thickness uniformity manufactured thereby.

A method for manufacturing a plastic substrate having excellent thickness uniformity, and a plastic substrate having excellent thickness uniformity manufactured thereby.

The invention relates to a water based composition to be used for the preparation of anti-abrasion coatings on ophthalmic lenses. The composition comprises: the product of hydrolysis of an epoxyalkoxysilane SiXY.sub.3, wherein X represents a monovalent organic group linked to the silicon atom through a carbon atom and containing at least one epoxy function and Y represents an alkoxy group; cationic nanoparticles comprising silica, wherein a water sol of said cationic particles is stable at acidic pH; an inorganic non-hydrogen Lewis acid; a surfactant such that a water solution of 15 wt % of said surfactant exhibits a static surface tension below 25 mN/m at 20° C.; less than 0.5 wt % of a water miscible organic solvent less volatile than water. Moreover, the composition comprises no organic solvents other than said water miscible organic solvent less volatile than water and other than organic solvents that are a product of hydrolysis of the epoxyalkoxysilane.

The invention relates to a water based composition to be used for the preparation of anti-abrasion coatings on ophthalmic lenses. The composition comprises: the product of hydrolysis of an epoxyalkoxysilane SiXY.sub.3, wherein X represents a monovalent organic group linked to the silicon atom through a carbon atom and containing at least one epoxy function and Y represents an alkoxy group; cationic nanoparticles comprising silica, wherein a water sol of said cationic particles is stable at acidic pH; an inorganic non-hydrogen Lewis acid; a surfactant such that a water solution of 15 wt % of said surfactant exhibits a static surface tension below 25 mN/m at 20° C.; less than 0.5 wt % of a water miscible organic solvent less volatile than water. Moreover, the composition comprises no organic solvents other than said water miscible organic solvent less volatile than water and other than organic solvents that are a product of hydrolysis of the epoxyalkoxysilane.

A xylylene diisocyanate, a compound represented by the following chemical formula (1), and a compound represented by the following chemical formula (2) are contained in a xylylene diisocyanate composition.

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A xylylene diisocyanate, a compound represented by the following chemical formula (1), and a compound represented by the following chemical formula (2) are contained in a xylylene diisocyanate composition.

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Compositions that are curable to polythioether polymers are provided, comprising: a) a dithiol monomer; b) a diene monomer; c) a radical cleaved photoinitiator; d) a peroxide; and e) an amine; where the peroxide and amine together are a peroxide-amine redox initiator. In some embodiments, the amine is a tertiary amine. In some embodiments, the amine is selected from the group consisting of dihydroxyethyl-p-toluidine, N,N-diisopropylethylamine, and N, N, N′, N″, N″-pentamethyl-diethylenetriamine. In some embodiments, the peroxide is selected from the group consisting of di-tert-butyl peroxide, methyl ethyl ketone peroxide, and benzoyl peroxide. In some embodiments, the composition may additionally comprise a polythiol monomer having three or more thiol groups.