- POLYTHIOL COMPOSITION FOR A PLASTIC OPTICAL LENS
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The embodiments relate to a polythiol composition for a plastic optical lens and a polythiourethane-based plastic optical lens prepared therefrom. In the embodiments, a first polythiol compound having an ester group and a mercapto group only as a hydrogen-bondable functional group and a second polythiol compound having an ester group and a hydrogen-bondable functional group other than a mercapto group are used in an appropriate amount. Thus, it is possible to control the viscosity of a polymerizable composition at the initial stage of polymerization at a low temperature of 5 to 15℃ and to stabilize the rate of increase in the viscosity of the composition and the reaction rate thereof, thereby preventing the generation of striae, bubbles, and the like. Further, various plastic lenses such as eyeglass lenses, camera lenses, and the like having excellent appearance characteristics (without striae and bubbles) and excellent optical characteristics can be obtained from the composition.
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Paragraph 0061; 0062; 0063; 0064
(2020/01/14)
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- METHOD FOR PREPARING ESTER POLYTHIOL WITH HIGH YIELD
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According to an embodiment, by washing, with a tertiary amine aqueous solution, an ester polythiol composition manufactured by conducting a reaction of polyol with an excess thiol group-containing carboxylic acid under an acid catalyst, it is possible to effectively remove remaining thiol group-containing carboxylic acid and the acid catalyst, and also improve a yield of ester polythiol.COPYRIGHT KIPO 2019
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Paragraph 0134-0136
(2019/08/23)
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- PROCESS FOR PRODUCING PENTAERYTHRITOL MERCAPTOCARBOXYLIC ACID ESTER, PENTAERYTHRITOL MERCAPTOCARBOXYLIC ACID ESTER OBTAINED BY THE SAME, AND USE THEREOF
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Pentaerythritol which contains none of the alkali metals and alkaline earth metals or which contains at least one of these in a total amount of 1.0 wt.% or smaller is reacted with a mercaptocarboxylic acid to produce a pentaerythritol mercaptocarboxylic acid ester.
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Page/Page column 11-14
(2010/11/27)
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- Synthesis of 12- and 13-membered sulfur-containing lactones by homolytic macrocyclization of mercaptoacetic esters with alkynes
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Starting from mercaptoacetic acid esters of 1,2- or 1,3-diols and substituted acetylenes 12- and 13-membered sulfur-containing lactones as 1:1 adducts were synthesised in yields up to 48%. The mechanism of this homolytic reaction, which is initiated by the tripropylborane/oxygen system, includes generation of thiyl radicals and their addition to the triple bond of alkynes.
- Demchuk,Lazareva,Lindeman,Khrustalyov,Struchkov,Ismagilov,Troyansky,Nikishin
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p. 307 - 311
(2007/10/02)
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