Invention Grant
- Patent Title: Process for producing pentaerythritol mercaptocarboxylic acid ester, polymerizable composition, resin, optical material, and lens
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Application No.: US15739425Application Date: 2016-06-24
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Publication No.: US10696627B2Publication Date: 2020-06-30
- Inventor: Shigetoshi Kuma , Masayuki Furuya , Takeshi Nishimura
- Applicant: MITSUI CHEMICALS, INC.
- Applicant Address: JP Minato-Ku, Tokyo
- Assignee: MITSUI CHEMICALS, INC.
- Current Assignee: MITSUI CHEMICALS, INC.
- Current Assignee Address: JP Minato-Ku, Tokyo
- Agency: Buchanan Ingersoll & Rooney PC
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@40ef647d
- International Application: PCT/JP2016/068788 WO 20160624
- International Announcement: WO2016/208707 WO 20161229
- Main IPC: C07C323/52
- IPC: C07C323/52 ; C07C319/12 ; C08G18/38 ; G02B1/04 ; C07C31/24 ; G01N21/03
Abstract:
A process for producing a pentaerythritol mercaptocarboxylic acid ester of the present invention includes: a step of reacting pentaerythritol with a mercaptocarboxylic acid, in which an absorbance of a 5 wt % aqueous solution of the pentaerythritol at a wavelength of 270 nm, which is measured using a quartz cell having an optical path length of 50 mm, is 0.07 or less.
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