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. 13, 2021
Filed:
Oct. 26, 2018
Applicant:
Hoya Lens Thailand Ltd., Pathumthani, TH;
Inventors:
Assignee:
HOYA LENS THAILAND LTD., Pathumthani, TH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 319/14 (2006.01); C07C 319/20 (2006.01); C07C 335/32 (2006.01); G02B 1/04 (2006.01); C08G 18/24 (2006.01); C08G 18/76 (2006.01); C08G 18/38 (2006.01);
U.S. Cl.
CPC ...
C07C 319/14 (2013.01); C07C 319/20 (2013.01); C07C 335/32 (2013.01); C08G 18/246 (2013.01); C08G 18/3876 (2013.01); C08G 18/7642 (2013.01); G02B 1/04 (2013.01); G02B 1/041 (2013.01);
Abstract
The method for producing a polythiol compound includes reacting 2-mercaptoethanol having a water content of 3000 ppm or less on a mass basis, with epihalohydrin to obtain a halide represented by the formula (1), wherein X represents a halogen atom; and obtaining at least one polythiol compound selected from the group consisting of a polythiol compound represented by the formula (4), a polythiol compound represented by the formula (5), a polythiol compound represented by the formula (6), and a polythiol compound represented by the formula (7).