Patent ID: 9481763
Filing Date: 2016-11-01
CPC Classification: C08G

Claim Text:
1. A method of producing a polyalkyleneimine having a degree of branching of more than 50% from an alkyleneimine, the method comprising semi-discontinuously reacting at least one alkyleneimine in the presence of an aqueous solvent and carbon dioxide as a catalyst in one reaction container to produce a polyalkyleneimine, wherein: the at least one alkyleneimine is metered into an initial charge comprising the aqueous solvent, the carbon dioxide, and an additive selected from the group consisting of methylamine, dimethylamine, ethylamine, diethylamine, propylamine, ethylenediamine, diethylenetriamine, triethylenetetramine, and 3,3-dimethylaminopropyl amine; and the carbon dioxide is a sole catalyst in the reaction.