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.
Claims8
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 0.07 or less.
A method for screening pentaerythritol, in a process for producing a pentaerythritol mercaptocarboxylic acid ester by reacting pentaerythritol with a mercaptocarboxylic acid, comprising:
- preparing a 5 wt % aqueous solution of the pentaerythritol;
- and
- selecting the pentaerythritol that an absorbance of the 5 wt % aqueous solution thereof 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.
Dependencies are inferred from the claim text.