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:
Feb. 14, 2023
Filed:
Dec. 10, 2020
Skc Co., Ltd., Gyeonggi-do, KR;
Jaeyoung Pai, Gyeonggi-do, KR;
Seung Mo Hong, Gyeonggi-do, KR;
Hyeon Myeong Seo, Gyeonggi-do, KR;
Junghwan Shin, Gyeonggi-do, KR;
Jeongmoo Kim, Gyeonggi-do, KR;
Jung Hwan Myung, Gyeonggi-do, KR;
Hyuk Hee Han, Gyeonggi-do, KR;
SKC CO., LTD., Gyeonggi-do, KR;
Abstract
The embodiments relate to a process for preparing a polythiol composition, which comprises reacting a halogen compound or an alcohol compound with thiourea to prepare a thiouronium salt solution; and adding a basic solution to the thiouronium salt solution to hydrolyze it. The hydrolysis reaction is terminated when the area of peak A in the graph measured by gel permeation chromatography of the reactant in the hydrolysis step under certain conditions is 0.5% to 8% based on the total peak area. A tetrafunctional polythiol composition having high purity can be obtained. Thus, an optical lens having excellent color, transparency, and refractive index can be obtained.