Abstract: A process for producing a charge-reversed aqueous silica sol includes: (a) providing a slurry of an acidic cation-exchange solid in an aqueous liquid; (b) providing a starting aqueous silica sol with an alkaline pH and including a monovalent cation(s); (c) contacting the slurry with the starting sol; (d) separating the acidic cation-exchange solid from the mixture (c) to leave a decationised aqueous silica sol with an acidic pH and a reduced monovalent cation(s) content compared to the starting sol; and (e) contacting the decationised sol with a compound(s) including a modifying element(s) that can adopt a +3 or +4 oxidation state to produce a charge-reversed aqueous silica sol whose silica particles include the modifying element(s) on their surface. The S-value of the starting sol is from about 10 to about 50%, and the surface area of colloidal silica particles in the starting sol is at least about 500 m2 g?1.

Abstract: The invention relates to a process for the manufacture of thermally expandable thermoplastic microspheres. The process comprises, providing a mixture of monomeric materials suitable for polymerisation to form a thermoplastic polymer and at least one blowing agent, providing to the mixture a colloidal silica that is surface-modified with at least hydrophobic organosilane groups and forming an emulsion. A polymerisation is performed to form the thermally expandable thermoplastic microspheres. The invention further relates to thermally expandable thermoplastic micro spheres, expanded micro spheres and their use in the manufacture of products.

Abstract: Methylsilyl derivatized silica particles are disclosed. The methylsilyl derivatized silica particles have a methylsilyl content in a range of between 1-6 ?mol m?2 on a surface of the silica particles. Colloidal silica comprising the methylsilyl derivatized silica particles is also disclosed. Methods for the manufacture of the methylsilyl derivatized silica particles are disclosed. Kits for coatings comprising the methylsilyl derivatized silica particles are also disclosed.

Abstract: Methylsilyl derivatised silica particles are disclosed. The methylsilyl derivatised silica particles have a methylsilyl content in a range of between 1-6 ?mol m?2 on a surface of the silica particles. Colloidal silica comprising the methylsilyl derivatised silica particles is also disclosed. Methods for the manufacture of the methylsilyl derivatised silica particles are disclosed. Kits for coatings comprising the methylsilyl derivatised silica particles are also disclosed.

Abstract: The present invention relates to a particle of modified silica which comprises a particle of silica which is covalently linked to at least one halohydrin moiety. Furthermore, the present invention relates to a method of preparing the particle of modified silica, a particle of modified silica obtained by such method, use of the particle of modified silica as a stationary phase for chromatography, as well as a separation column for chromatography comprising the particle of modified silica.

Abstract: The present invention relates to a particle of modified silica which comprises a particle of silica which is covalently linked to at least one halohydrin moiety. Furthermore, the present invention relates to a method of preparing the particle of modified silica, a particle of modified silica obtained by such method, use of the particle of modified silica as a stationary phase for chromatography, as well as a separation column for chromatography comprising the particle of modified silica.

Abstract: The present invention relates to modified colloidal silica particles covalently linked to at least one polyalkyleneoxy moiety having at least about 3 alkyleneoxy units. The invention also relates to an aqueous dispersion thereof, and a method of producing such modified silica particles. The invention further relates to use of the modified colloidal silica particles as emulsifiers for paper sizing agents, agriculturally active ingredients and asphalts, as well as dispersant for oil spills.