3results about "Sulfur dyes" patented technology

The present invention relates to a process for preparing one or more thiopyridinone-type compounds of formula (I) and their optical isomers, geometric isomers, and tautomers, as well as their organic or mineral acid or base salts, and their solvates such as hydrates. The invention also relates to one or more thiopyridinone-type compounds of formula (I'') and a composition incorporating said compounds.

Described are contact lenses that contain high energy visible (HEV) light absorbing compounds and their use for improving one or more vision attributes.

A fluorescent dye according to formula (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X) and (XI): with R 1 selected from the group nitrile, nitro, formyl, carboxyl, substituted or unsubstituted C2-C 20 Acylalkyl, substituted or unsubstituted C5-C 20 Acylaryl, substituted or unsubstituted C2-C 20 Acyloxy, substituted or unsubstituted C2-C 20 Ester, substituted or unsubstituted C2-C 20 Amide with R 2 selected from the group hydrogen, nitrile, nitro, formyl, carboxyl, substituted or unsubstituted C2-C 20 Acylalkyl, substituted or unsubstituted C5-C 20 Acylaryl, substituted or unsubstituted C2-C 20 Acyloxy, substituted or unsubstituted C2-C 20 Ester, substituted or unsubstituted C2-C 20 Amide with R3 , R 4 , R 5 and R 6 independently selected from the group of substituted or unsubstituted C1-C 20 Alkyl, substituted or unsubstituted C2-C 20 Alkyl ethers and substituted or unsubstituted C6-C 20 Aryl; and with Z and X selected independently from a substituted or unsubstituted methylene or a substituted or unsubstituted ethane-1,2-diyl, where in formulas (I), (II), (III), (VI), (VII), (VIII), (IX) and (X) Z and X represent the substituted methylene and the substituted ethane-1,2-diyl with at least one substituted or unsubstituted C1-C 20 Alkyl and / or with a substituted or unsubstituted C2-C 20 Esters are substituted.