Patent ID: 11932591
Assignee: SKC, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B  G  Y | IPC B  C  G

Claim 6:
7. A process for preparing an optical lens, which comprises:
(1) reacting a diamine composition with an aqueous hydrochloric acid solution to obtain a diamine hydrochloride composition;
(2) adding a first organic solvent to obtain the diamine hydrochloride composition in a solid phase;
(3) reacting the diamine hydrochloride composition obtained in step 2 with triphosgene to obtain a diisocyanate composition; and
(4) mixing the diisocyanate composition with a thiol or an episulfide and polymerizing and curing the resultant in a mold,
wherein the diisocyanate composition has a b* value according to the CIE color coordinate of 0.1 to 2.0.