Process for producing pentaerythritol mercaptocarboxylic acid ester, polymerizable composition, resin, optical material, and lens
US10696627B2 · kind B2 · utility
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Key dates
| Filing date | Jun 24, 2016 |
| Grant date | Jun 30, 2020 |
| Priority date | — |
| Expiry date | Jun 24, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/041
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.