xanthate

[zan-theyt]
noun Chemistry.
a salt or ester of xanthic acid.

Origin:
1825–35; xanth(ic acid) + -ate2

xanthation, noun
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xanthate (ˈzænθeɪt)
 
n
any salt or ester of xanthic acid
 
xan'thation
 
n

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Encyclopedia Britannica
Encyclopedia

xanthate

any of a class of organic salts formed by treatment of an alcohol with carbon disulfide in the presence of an alkali. The term is derived from the Greek word xanthos, for "yellow," in reference to the compound potassium ethyl xanthate (C2H5OCS2K), which gives a yellow precipitate when combined with copper sulfate. The most important group of xanthates are the sodium salts produced from cellulose; these materials are processed to form the synthetic fibre rayon or the transparent film cellophane, then reconverted to cellulose. The xanthates of some low-molecular-weight alcohols are used as flotation agents for the concentration of ores.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Grafting starch xanthate with vinyl monomers and hydrogen peroxide in foam rubber production.
The xanthate is dissolved by the addition of dilute aqueous caustic to form viscose.
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