Ecolab USA Inc.

Nalco Company

Raymond D Miller, Jr

Zhi Quan Chen

Jane B Wong Shing

Wen Bai

Bruce A Keiser

Jian Xu

Jian Shen

David A Grattan

Ronald S Doles

Dennis L MacDonald

Jia Wu

Linda S Strysik

Minghua Li

Zhi Chen

Dennis Macdonald

The invention provides a method for improving the effectiveness of colloidal silica. The method involves removing enough charged impurities from the colloid to prevent the charged particles from causing the colloid to become a viscous gel. The method however also involves not removing too many charged particles so the silica material doesn't gel by cross-linking with itself. This method is quite effective because it recognizes that materials that have accumulated during the formation of the colloid do perform an important function, but they can perform better at a lower concentration.

Process for producing high solids colloidal silica

The present invention relates to colloidal silicas having a low S-value and a high solids content, the preparation thereof, and the use thereof in the production of paper. When used in the production of paper, the colloidal silicas of the invention exhibit good retention and drainage performance so that they can be used in lower amounts compared to conventional colloidal silicas. The present invention also relates to an apparatus and a method for producing such activated colloidal silicas.

Silica sols, method and apparatus for producing the same and use thereof in papermaking

A method of stabilizing silica-containing anionic microparticles upon mixing of the silica-containing anionic microparticles with hard water comprising adding one or more hardness-abating additives to the hard water prior to mixing of the hard water and the silica-containing anionic microparticles; or adding an effective stabilizing amount of one or more hardness-abating agents to the silica-containing anionic microparticles prior to mixing of the hard water with the silica-containing anionic microparticles and a stabilized composition comprising silica-containing anionic microparticles and an effective stabilizing amount of one or more hardness-abating additives.

Method of stabilizing silica-containing anionic microparticles in hard water

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Carol Stream, IL, United States of America

Raymond D Miller, Jr