Guanidine carbonate-containing silica sol

Details Guanidine carbonate-containing silica sol Guanidine carbonate-containing silica sol

C - Chemistry, Metallurgy

01

B

C01B 33/148 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2492094

The invention relates to a fine-particulate, stable, partially-aggregated silica gel with a BET surface area of 100 to 1200 m2/g, and a content of from 0.05 to 15 wt. % of guanidinium ions, a method for production thereof by reaction of a raw gel with guanidine carbonate, preferably in the presence of a further base and use of the silica gel as an aid in paper retention.

L'invention concerne un sol de silice en fines particules, stable et partiellement agrégé, lequel sol de silice présente une surface BET de 100 à 1 200 m?2¿/g et contient 0,05 à 15 % en poids d'ions de guanidinium. Cette invention concerne également un procédé de production dudit sol de silice, consistant à faire réagir un sol frais avec du carbonate de guanidine, de préférence en présence d'une autre base, ainsi que l'utilisation dudit sol de silice dans la rétention du papier.

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