Highly pure alkyl 2-cyanoacrylates
US6057472A · kind A · utility
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Key dates
| Filing date | Aug 6, 1998 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Aug 6, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C253/30
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of a highly pure alkyl 2-cyanoacrylate, wherein alkyl has 1-10 C atoms, characterized in that PA1 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); PA1 b) the product of (a) is separated in the form of a solid; PA1 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%
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.