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US 10,696,627 B2Granted
Process for producing pentaerythritol mercaptocarboxylic acid ester, polymerizable composition, resin, optical material, and lens
AssigneeMitsui Chemicals, Inc.
InventorsShigetoshi Kuma, Masayuki Furuya, Takeshi Nishimura
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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.
Claims6
A process for producing a pentaerythritol mercaptocarboxylic acid ester, the method comprising:
- a step of reacting pentaerythritol with a mercaptocarboxylic acid to obtain a pentaerythritol mercaptocarboxylic acid ester,
- wherein 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 0.003 or more and 0.07 or less,
- the content of bispentaerythritol in the pentaerythritol, with respect to the total weight of the pentaerythritol, is 1 wt % to 5 wt %, and
- the content of Na and Ca in the pentaerythritol, with respect to the total weight of the pentaerythritol, is less than 1 wt %.
1 more element
Dependencies are inferred from the claim text.