Polyethyleneimine phosphonate

In oil and gas well cementing operations, polyethyleneimine phosphonate-derivative dispersants enhance the flow behavior of the cement slurry [422]. The slurry can be pumped in turbulent flow, thereby forming a bond between the well casing and the rock formation. 

S. C. Crema, C. H. Kucera, C. Gousetis, and K. Oppenlaender. Cementing compositions containing polyethyleneimine phosphonate derivatives as ispersants. Patent EP 444542, 1991. 

Polyethylene oxides and polyethyleneimines are of great interest because of their ability to form a wide variety of metal and salt complexes. We have anchored polyethylene oxide oligomers (n=l-33) and polyimines (n=l-4) to zirconium phosphate type layers. The polymers are first converted to phosphates or phosphonates which in turn react with Zr(IV) solutions to form the layered derivatives. Cross-linking of the layers has also been accomplished. Preliminary structural and complexing behavior of these layered materials is presented. It is demonstrated that the NaSCN-polyethyleneoxide... 

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