S-alkyl thiocarbamate base lens resin
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsNobuyuki Kajimoto, Akihiro Tamaki, Teruyuki Nagata
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Abstract
An S-alkyl thiocarbamate base lens resin is obtained by reacting one or more NCO-containing compounds, such as xylylene diisocyanate, hexamethylene diisocyanate and/or tetrachloroxylylene diisocyanate, with one or more SH-containing aliphatic compounds, for example, a di(2-mercaptoalkyl) ether.
Claims15
An S-alkyl thiocarbamate base lens resin obtained by reacting one or more NCO-containing compounds with one or more SH-containing aliphatic compounds, wherein the said SH-containing aliphatic compound is a di(2-mercaptoalkyl)ether, 1,4-butanedithiol, di(2-mercaptoethyl) sulfide, 2-mercaptoethanol, ethylene glycol dithioglycolate, trimethylolpropane tris-(thioglycolate), or pentaerythritol tetrakis-(thioglycolate).
An S-alkyl thiocarbamate base lens resin obtained by reacting one or more NCO-containing compounds with one or more SH-containing aliphatic compounds, wherein the said SH-containing aliphatic compound is a di(2-mercaptoalkyl)ether, 1,4-butanedithiol, di(2-mercaptoethyl) sulfide, 2-mercaptoethanol, ethylene glycol dithioglycolate, trimethylolpropane tris-(thioglycolate), or pentaerythritol tetrakis-(thioglycolate), wherein the said one or more NCO-containing compounds and the said one or more SH-containing aliphatic compounds are used in a ratio which provides a ratio of NCO groups to SH groups of from 0.5 to 3.0.
A lens comprising a copolymer obtained by reacting one or more NCO-containing compounds with one or more SH-containing aliphatic compounds.
Dependencies are inferred from the claim text.