Freeze-thaw stable polyacrylamide emulsions

Details Freeze-thaw stable polyacrylamide emulsions Freeze-thaw stable polyacrylamide emulsions

C - Chemistry, Metallurgy

08

K

C08K 5/06 (2006.01) C08F 2/32 (2006.01) C08J 3/09 (2006.01) C08L 33/26 (2006.01) C08L 57/00 (2006.01)

Patent

CA 2090425

Water-in-oil emulsions of water-soluble polymers, i.e. polyacrylamides, which are subject to freeze-thaw degradation are stabilized against repeated freeze-thaw cycles by incorporating specific ethoxylated alkylphenol surfactants containing low levels of ethoxylation. Moreover, the resultant emulsions exhibit superior resistance to sheet gel formation under ambient storage conditions.

Les émulsions eau dans huile de polymères hydrosolubles, p. ex. polyacrylamides, qui sont soumises à la dégradation consécutive à des cycles gel-dégel sont stabilisées contre ces cycles gel-dégel répétés par l'incorporation de surfactants spécifiques d'alkylphénol éthoxylés présentant un faible degré d'éthoxylation. De plus, les émulsions ainsi obtenues présentent une résistance supérieure à formation gel dans les conditions de conservation ambiantes.

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