Polymeric particles, their manufacture and uses
AssigneeAllied Colloids Limited
InventorMichael B. Heard
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Abstract
A slow release composition comprises particles of a cross linked polymeric matrix in which a water soluble reagent is dispersed, and the reagent is anionic, generally being a low molecular weight anionic water soluble polymer, and the matrix is a cationic, highly cross linked, polymer formed from a water soluble monomer or monomer blend.
Claims17
A slow release composition comprising particles having a dry size of at least 100 .mu.m of a cross linked polymerics matrix formed from a water soluble monomer or monomer blend and through which a water soluble reagent is substantially homogeneously distributed, and in which the reagent is anionic and is a water soluble polymeric material formed from water soluble ethylenically unsaturated acidic monomer optionally blended with one or more other ethylenically unsaturated monomers as a water soluble blend, and the polymeric matrix is cross linked sufficient for the particles to be substantially non-swelling in water and is cationic.
A slow release composition comprising particles having a dry size of at least 100 .mu.m of a cross linked polymeric matrix formed from a water soluble monomer or monomer blend and through which polyacrylic acid is substantially homogeneously distributed and the polymeric matrix is cross linked sufficiently for the particles to be substantially non-swelling in water and is cationic.
A slow release composition comprising particles having a dry size of at least 100 .mu.m of a cross linked polymeric matrix formed from a monomer blend comprising an ethylenically unsaturated non-ionic monomer, the polymeric matrix being cross linked sufficient for the particles to be substantially non-swelling in water and is cationic, and through which a water soluble reagent which is a water soluble polymeric material formed from a water soluble ethylenically unsaturated monomer or monomer blend comprising acrylic acid is substantially homogeneously distributed.
Dependencies are inferred from the claim text.