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US 5,347,043 AGranted
Process for preparing Michael addition products
AssigneeAlbemarle Corporation
InventorsMahmood Sabahi, Robert G. Irwin
Life of this patent
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AssigneeAlbemarle Corporation
InventorsMahmood Sabahi, Robert G. Irwin
Estimating the term…
Dialkyl malonate/alkyl acrylate Michael addition product mixtures having at least three acceptor moieties in a substantial number of the molecules can be consistently prepared without the need for long reaction times or the use of a large excess of the acceptor when the reaction is effected by gradually adding one molar proportion of a dialkyl malonate to at least three molar proportions of an alkyl acrylate which has been preheated to 60.degree.-80.degree. C. in admixture with an initiator and a phase transfer catalyst. In a preferred embodiment, the preheated mixture is maintained at 60.degree.-80.degree. C. for at least one hour before the dialkyl malonate is added in order to increase the percentage of product composed of the heavier components.
In a process for reacting one molar proportion of a dialkyl malonate with at least three molar proportions of an alkyl acrylate in the presence of a basic initiator and a phase transfer catalyst to prepare a Michael addition product mixture that contains molecules having at least three alkyl acrylate moieties, the improvement which comprises preheating a mixture of the alkyl acrylate, the initiator, and the phase transfer catalyst to 60.degree.-80.degree. C. and then gradually adding the dialkyl malonate to the preheated mixture to effect reaction with the alkyl acrylate.
Dependencies are inferred from the claim text.