초록 ▼

Polymer particles comprising a hydrophobic organic matrix and located at the exterior free cationic groups and a further polymer which comprises free hydroxy groups. The particles are produced by an aqueous suspension polymerization process wherein the continuous aqueous phase contains a polymerizat

Polymer particles comprising a hydrophobic organic matrix and located at the exterior free cationic groups and a further polymer which comprises free hydroxy groups. The particles are produced by an aqueous suspension polymerization process wherein the continuous aqueous phase contains a polymerization stabilizer and a dissolved vinyl addition cationic monomer. The polymerization stabilizer can be any suitable polymer that comprises free hydroxy groups. The process results in polymers of average particle size in the range 50 to 150 microns and reduced levels of undesired polymer emulsion or undersized particles. The particles are particularly useful for absorbing water insoluble active ingredients, such as insecticides, insect repellents, fragrances, pheromones for subsequent slow release. The cationic surface character of said polymer particles makes them especially useful for forming stable dispersions or slurries in active concentrates such as perfume bases or detergent concentrates. Furthermore these dispersions or slurries remain stable and substantially free of agglomerates. The particles containing active ingredient readily associate with fabrics such as cotton, wool and viscose where the active ingredient is released in a controlled fashion over several days.

대표청구항 ▼

[ What is claimed is:] [1.]1. Water-insoluble organic polymer particles formed of hydrophobic core polymer and having at their surface at least one further free-hydroxy-containing polymer which contribute(s) a hydroxyl and a cationic functionality at that surface, wherein the cationic functionality

[ What is claimed is:] [1.]1. Water-insoluble organic polymer particles formed of hydrophobic core polymer and having at their surface at least one further free-hydroxy-containing polymer which contribute(s) a hydroxyl and a cationic functionality at that surface, wherein the cationic functionality is provided by pendant cationic groups that have been derived from cationic vinyl addition monomer units which are either bonded to the organic water-insoluble polymer or are cationic monomer units present in the further free-hydroxy-containing polymer.