Process for preparing phosphonate-terminated polymers

Details Process for preparing phosphonate-terminated polymers Process for preparing phosphonate-terminated polymers

C - Chemistry, Metallurgy

08

F

C08F 2/38 (2006.01) C08F 8/40 (2006.01) C08F 20/04 (2006.01)

Patent

CA 2198835

A process for efficiently utilizing phosphorous acid or salts thereof as a chain transfer agent in the polymerization of monomers, particulary unsaturated carboxylic acid monomers, is provided, where the polymerization is conducted at an in-process solids level of at least 40 percent and in-process neutralization level of at least 30% to produce low molecular weight water-soluble phosphonate-terminated polymers.

Procédé pour utiliser efficacement l'acide phosphoreux ou ses sels comme agents de transfert de chaîne dans la polymérisation de monomères, notamment de monomères d'acide carboxylique insaturés, où la polymérisation est effectuée à un taux de solides d'au moins 40 % et à un taux de neutralisation d'au moins 30 % au cours du procédé, de façon à obtenir des polymères hydrosolubles de faible masse moléculaire, terminés par le groupe phosphonate.

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