Aqueous suspension of a cellulose ether, method for the...

C - Chemistry – Metallurgy – 08 – L

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C08L 1/26 (2006.01) C08J 3/05 (2006.01) C08K 3/32 (2006.01)

Patent

CA 2428791

This invention relates to a suspension of a water-soluble, nonionic cellulose ether having a fairly low content of an electrolytic salt exhibiting a high stability and a low viscosity. The suspension having a pH-value of below 8.0, contains 10-30 % by weight of a water-soluble, nonionic cellulose ether, and 10-22 % by weight of an electrolytic salt, wherein the electrolytic salt contains a) 10-90 % by weight of a salt of polyphosphate having 3-12 phosphate groups, and b) 10-90 % by weight of a salt selected from the group consisting of ortophosphate, pyrophosphate, sulphate, carbonate and a mixture thereof. The suspension is advantageously produced by adding a dry blend containing the water-soluble cellulose ether in cross-linked form and the electrolytic salt to water.

La présente invention concerne une suspension d'un éther de cellulose non ionique soluble dans l'eau, ayant une teneur sensiblement faible en sel électrolytique, ayant une stabilité élevée et une viscosité faible. La suspension ayant un pH inférieur à 8,0, contient 10-30 % en poids d'un éther de cellulose non ionique soluble dans l'eau et 10-22 % en poids d'un sel électrolytique. Le sel électrolytique contient: a) 10-90 % en poids d'un sel de polyphosphate ayant de 3 à 12 groupes phosphate; et b) 10-90 % en poids d'un sel choisi parmi le groupe comprenant ortophosphate, pyrophosphate, sulphate, carbonate ou un mélange de ceux-ci. La suspension peut être facilement préparée par adjonction à de l'eau d'un mélange sec contenant l'éther de cellulose soluble dans l'eau sous une forme réticulée, et le sel électrolytique.

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