US 11,932,591 B2
Method of preparing diisocyanate composition and optical lens
Jaeyoung Pai, Gyeonggi-do (KR); Jeongmoo Kim, Gyeonggi-do (KR); Hyuk Hee Han, Gyeonggi-do (KR); Jung Hwan Myung, Gyeonggi-do (KR); Jooyoung Jung, Gyeonggi-do (KR); and Myung-Ok Kyun, Gyeonggi-do (KR)
Assigned to SKC CO., LTD., Gyeonggi-do (KR); and WOORI FINE CHEM CO., LTD., Gyeonggi-do (KR)
Filed by SKC CO., LTD., Gyeonggi-do (KR); and WOORI FINE CHEM CO., LTD., Gyeonggi-do (KR)
Filed on Jan. 27, 2022, as Appl. No. 17/586,151.
Application 17/586,151 is a continuation in part of application No. 17/111,891, filed on Dec. 4, 2020, abandoned.
Claims priority of application No. 10-2019-0161540 (KR), filed on Dec. 6, 2019.
Prior Publication US 2022/0144761 A1, May 12, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 263/10 (2006.01); B29D 11/00 (2006.01); C08G 18/38 (2006.01); C08G 18/73 (2006.01); C08G 18/75 (2006.01); C08G 18/76 (2006.01); G02B 1/04 (2006.01)
CPC C07C 263/10 (2013.01) [B29D 11/00009 (2013.01); C08G 18/3876 (2013.01); C08G 18/73 (2013.01); C08G 18/755 (2013.01); C08G 18/7642 (2013.01); G02B 1/041 (2013.01)] 8 Claims
 
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.