C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/455.6
C07D 263/14 (2006.01) C07D 263/12 (2006.01)
Patent
CA 1099733
ABSTRACT This invention is directed to a process for preparing a 2-isocyanatoalkyl ester of an unsaturated carboxylic acid by reacting a water-soluble 2-alkenyl- -2-oxazoline with a solution of phosgene in a water- -immiscible organic solvent in the presence of an aqueous solution of a hydrochloric acid acceptor. The process is characterized by adding the 2-alkenyl-2-oxazoline into the reaction mixture as an aqueous solution. The aqueous solution of -the 2-alkenyl-2-oxazoline is prepared by reacting a 2-alkyl-2-oxazoline with formaldehyde to form 2-(.alpha.-hydroxymethylalkyl)-2-oxazoline, dehydrating the 2-(.alpha.-hydroxymethylalkyl)-2-oxazoline to form the 2-alkenyl- -2-oxazoline, and separating a volatile composition from the reaction product of the dehydrating step which when condensed, comprises an aqueous solution of the 2-alkenyl- -2-oxazoline. The 2-isocyanatoalkyl esters produced by the process of this invention are useful as reactive inter mediates in preparing coating formulations from hydroxyl- -containing compounds that are curable through the carbon- -to-carbon double bond.
305468
Smart & Biggar
The Dow Chemical Company
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