Method for manufacturing diisocyanate and optical lens
AssigneeWoori Fine Chem Co., Ltd.
InventorsDal Seong KIM, Oh Joon KWON, Sung Gi LEE, Gyeong Ha CHOI, Junghwan SHIN
Life of this patent
Estimating the term…
Abstract
Provided is a method for manufacturing diisocyanate and an optical lens in which, during the manufacture of diisocyanate from diamine via diamine hydrochloride, use is made of an aqueous hydrochloric acid solution and an organic solvent instead of hydrogen chloride gas and solid-phase triphosgen instead of phosgen gas while reaction conditions are controlled, whereby the diisocyanate of high quality can be manufactured at excellent yield, with the causation of less environmental problems.
Claims15
A process for preparing metaxylylene diisocyanate, which comprises:
- reacting metaxylylenediamine with an aqueous hydrochloric acid solution in a first solvent to obtain metaxylylenediamine hydrochloride;
- and
- reacting the metaxylylenediamine hydrochloride with triphosgene in a second organic solvent to obtain metaxylylene diisocyanate.
A process for preparing a diisocyanate, which comprises:
- preparing at least one diamine selected from the group consisting of orthoxylylenediamine, metaxylylenediamine, paraxylylenediamine, norbornenediamine, hydrogenated xylylenediamine, and isophoronediamine;
- reacting the diamine with an aqueous hydrochloric acid solution in a first solvent to obtain a diamine hydrochloride;
- and
- reacting the diamine hydrochloride with triphosgene in a second organic solvent to obtain a diisocyanate.
A process for preparing an optical lens, which comprises:
- preparing at least one diamine selected from the group consisting of orthoxylylenediamine, metaxylylenediamine, paraxylylenediamine, norbornenediamine, hydrogenated xylylenediamine, and isophoronediamine;
- reacting the diamine with an aqueous hydrochloric acid solution in a first solvent to obtain a diamine hydrochloride;
- reacting the diamine hydrochloride with triphosgene in a second organic solvent to obtain a diisocyanate;
- and
- mixing the diisocyanate with a thiol or an episulfide and polymerizing and curing the resultant in a mold.
Dependencies are inferred from the claim text.