| abstract |
The reaction of the compounds of the formula: X2O3P.CHY CZ2 in which Y and each Z are, each, H, PO3X2, SO3X or CO3X or CO2X, for example, vinyl phosphonic acid or vinylidene diphosphonic acid, with acid Hypophosphorous, in the presence of free radicals provides the new compounds X2O3PCHYZ2PO2XH, which react with monomers such as vinyl sulfonate, vinyl phosphonate, vinyl idene diphosphonate and acrylic acid to form telomers useful in inhibiting scale formation, especially fouling. barium in oil wells; the polymers denote better adsorption in terms of rocks than PVSA and better thermostability than random copolymers containing equivalent phosphorous. |