The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2024
Filed:
Dec. 02, 2020
Skc Co., Ltd., Gyeonggi-do, KR;
Woori Fine Chem Co., Ltd., Gyeonggi-do, KR;
Jaeyoung Pai, Gyeonggi-do, KR;
Jeongmoo Kim, Gyeonggi-do, KR;
Jung Hwan Myung, Gyeonggi-do, KR;
Hyuk Hee Han, Gyeonggi-do, KR;
SK PUCORE CO., LTD., Ulsan, KR;
WOORI FINE CHEM CO., LTD., Gyeonggi-Do, KR;
Abstract
In the embodiments, an aqueous hydrochloric acid solution instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens of higher quality, in which the reaction temperature of a diamine hydrochloride composition and triphosgene is controlled to a specific range, or a crude diisocyanate composition obtained from the reaction of a diamine hydrochloride composition and triphosgene is distilled at a specific temperature range, or the molar ratio of a diamine hydrochloride and triphosgene is adjusted to a specific range.