Composite particles and methods for their preparation
OwnerSteven P. Armes, Andreas Schmidinventors
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Abstract
In a process for producing composite particles comprising a polymer and a finely divided inorganic solid, the process comprises providing an aqueous dispersion of a sol of the modified finely divided solid, adding at least one monomer suitable for free radical type polymerisation and adding a suitable free radical polymerisation initiator to initiate polymerisation of the monomer, wherein the reaction mixture is free from added surfactant, dispersant or auxiliary co-monomer. Compositions comprising the resulting particles are also disclosed.
Claims89
A process for producing composite particles comprising a polymer and a finely divided inorganic solid, the process comprising providing an aqueous dispersion of a sol of the modified finely divided solid, and mixing with at least one monomer suitable for free radical type polymerisation and a suitable free radical polymerisation initiator to initiate polymerisation of the monomer, wherein the reaction mixture is free from one or more of added surfactant, added dispersant, organic co-solvent and auxiliary co-monomer.
28-60. (canceled)
An aqueous composition comprising composite particles, said composite particles comprising a polymer formed by polymerisation of a styrene and an ester of a ethylenically unsaturated mono- and di-carboxylic acids, and a modified finely divided solid.
Dependencies are inferred from the claim text.