Patent ID: 11932591
Assignee: WOORI FINE CHEM CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B  G  Y | IPC B  C  G

Claim 0:
1. A process for preparing a diisocyanate composition, 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; and
(3) reacting the diamine hydrochloride composition obtained in step 2 with triphosgene to obtain a diisocyanate composition,
wherein the diisocyanate composition has a b* value according to the CIE color coordinate of 0.1 to 2.0.