Highly pure alkyl 2-cyanoacrylates
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United States of America Patent
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May 2, 2000
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N/A
app pub date -
Aug 6, 1998
filing date -
Aug 7, 1997
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Abstract
A process for the preparation of a highly pure alkyl 2-cyanoacrylate, wherein alkyl has 1-10 C atoms, characterized in that a) formaldehyde is reacted with an alkyl cyanoacetate ester by means of a catalyst in a solvent mixture selected from the group comprising ethylacetate, diglyme, dichloroethane and benzene, yielding an oligo-(alkyl 2-cyanoacrylate); b) the product of (a) is separated in the form of a solid; c) the product of (b) is depolymerized under sulfur dioxide atmosphere free from other polymerization inhibitors to yield an alkyl 2-cyanoacrylate with a purity of 98-100%
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