METHOD FOR PRODUCING 3-MERCAPTOPROPIONIC ACID, AND METHODS USING SAME FOR PRODUCING CARBOXYLIC ACID ESTER COMPOUND HAVING MERCAPTO GROUP AND THIOURETHANE-BASED OPTICAL MATERIAL
申请人:KOC SOLUTION CO., LTD.
公开号:US20180179154A1
公开(公告)日:2018-06-28
A method for producing 3-mercaptopropionic acid and methods using same for producing a carbonic acid ester compound having a mercapto group and a thiourethane-based optical material. The present invention improves a process during the production of 3-mercaptopropionic acid, significantly increases yield, and reduces the temperature and time during vacuum distillation, thereby preventing the destruction of a product and significantly increasing productivity. The present invention allows high-purity 3-mercaptopropionic acid having an excellent color to be finally yielded; accordingly, by using same, a high-purity carbonic acid ester compound having an excellent color and a mercapto group can be inexpensively obtained. A thiourethane-based polymeric composition and a thiourethane-based optical material obtained by polymerizing same can likewise be inexpensively obtained by using said carbonic acid ester compound. Such carbonic acid ester compound can be used for the production of inexpensive thiourethane optical lenses; consequently, inexpensive optical lenses having an excellent color can be obtained.
PROCESS FOR PRODUCING PENTAERYTHRITOL MERCAPTOCARBOXYLIC ACID ESTER, POLYMERIZABLE COMPOSITION, RESIN, OPTICAL MATERIAL, AND LENS
申请人:MITSUI CHEMICALS, INC.
公开号:US20180186733A1
公开(公告)日:2018-07-05
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.
POLYTHIOL COMPOSITION, POLYMERIZABLE COMPOSITION FOR OPTICAL MATERIALS, AND USE OF POLYMERIZABLE COMPOSITION FOR OPTICAL MATERIALS
申请人:Mitsui Chemicals, Inc.
公开号:EP2824126A1
公开(公告)日:2015-01-14
A polythiol composition according to the present invention includes a polythiol compound (A) having three or more mercapto groups and a nitrogen-containing compound (B) in which one of a mercapto group of the polythiol compound (A) is replaced with a group represented by the following formula (a) and other one of a mercapto group of the polythiol compound (A) is replaced with a hydroxyl group, in which the peak area of the nitrogen-containing compound (B) is equal to or less than 3.0 with respect to the peak area of 100 of the polythiol compound (A) in a high performance liquid chromatography measurement.
CHROMENE COMPOUND, CURABLE COMPOSITION COMPRISING THE COMPOUND, AND OPTICAL ARTICLE INCLUDING A CURED BODY OF THE CURABLE COMPOSITION
申请人:TOKUYAMA CORPORATION
公开号:US20200190106A1
公开(公告)日:2020-06-18
A chromene compound having at least one indenonaphthopyran moiety which has a group forming a spiro ring together with the 13-position carbon atom and further an oligomer chain group selected from a polyalkylene oxide oligomer chain group having at least three recurring units and a polyester oligomer chain group having at least three recurring units, represented by the following formula and having reduced matrix dependence:
wherein R
1
and R
2
are each a group which may have an oligomer chain group, the ring Z bonded to the 13-position carbon atom of the chromene compound is a Spiro ring group, and R
3
and R
4
are each an aryl group or heteroaryl group which may have an oligomer chain group.
Preferably, the chromene compound has at least one oligomer chain group in the molecule.
Processes using alpha, omega-difunctional aldaramides as monomers and crosslinkers
申请人:Andrews Allen Mark
公开号:US20060264672A1
公开(公告)日:2006-11-23
Processes using alpha, omega-difunctional aldaramides as monomers and crosslinkers are disclosed. The processes can be used to form polymers, particularly crosslinked polymers.