Akzo Nobel Chemicals International B.v.

Nouryon Chemicals International B.v.

Anders Törncrona

Per Anders Restorp

Peter Harry Johan Greenwood

Christina Nyholm

Bo Andreasson

Johan Lif

Krister Holmberg

Joakim Erik Patrik Högblom

Peter Daniel Hell

Andreas Sundblom

Helena Bergenudd

Romain Bordes

Joakim Erik Patrik HÖGBLOM

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 mg.

Charge-reversed silica sol

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.

Thermally expandable thermoplastic microspheres and process for their preparation

Methylsilyl derivatized silica particles are disclosed. The methylsilyl derivatized silica particles have a methylsilyl content in a range of between 1-6 &#x3bc;mol mon 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.

Methylsilyl derivatised silica particles, colloids, methods for manufacture and kits comprising the same

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.

Particle of modified silica

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Bohus, Sweden

Anders Törncrona