Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1979-10-22
1982-01-12
Trousof, Natalie
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
260404, 560105, 560106, 560107, 560110, 560218, 560220, 560221, 560254, 560255, 560262, 560266, C07C 6714
Patent
active
043106889
ABSTRACT:
The level of hydrolyzable chloride-containing impurities in an isocyanatoalkyl ester of an organic carboxylic acid is reduced by reacting the impurities with a vicinal epoxide-containing compound and then fractionally distilling the mixture to recover the isocyanatoalkyl ester. As an example, crude 2-isocyanatoethyl methacrylate (IEM) in a methylene chloride solution containing 0.084 weight percent of hydrolyzable chloride is contacted with a diglycidyl ether of bisphenol A at 23.degree. C. This reaction mixture is then fractionally distilled to separate the IEM from the methylene chloride first cut and the epoxy resin residue. The hydrolyzable chloride level of the distilled IEM product is only 0.03 weight percent.
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Glenn Michael L.
Hendriksen L.
The Dow Chemical Company
Trousof Natalie
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