Bead polymerization process
AssigneeTioxide Group Limited
InventorsGeoffrey Willison, John C. W. Hodge
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Abstract
A process for the preparation of rigid beads, of cross-linked polyester resin which beads may be solid or vesiculated, by forming an oil-in-water or a water-in-oil-in-water emulsion in which the oil phase contains an unsaturated polyester resin and an unsaturated organic monomer to provide said cross-linking and thereafter heating the emulsion to a temperature of at least 45.degree. C. before initiating polymerization of the oil phase by the introduction into the system of a polymerization initiator, and promoter system, if the latter is not already present in the emulsion.
Claims10
A process for the preparation of rigid beads formed from cross-linked polyester resin comprising forming an oil-in-water or a water-in-oil-in-water emulsion in which the oil phase contains an unsaturated polyester resin and an unsaturated organic monomer to provide said cross-linking;
- heating the emulsion to a temperature of at least 45.degree. C. and thereafter introducing into the heated emulsion a polymerisation initiator, and promoter system if not already present, thereby initiating cross-linking of the resin to form an aqueous suspension of rigid beads of cross-linked polyester resin.
Dependencies are inferred from the claim text.