Particles having a polymeric shell and their production
First Claim
1. A particulate composition comprising particles having a hydrophilic core within a shell comprising a membrane comprising an association product of (a) an interfacial condensation product formed by reaction between an oil soluble first IFC reactant having at least two first condensation groups and a water soluble second IFC reactant having at least two second condensation groups and (b) an oil soluble or oil swellable amphipathic polymeric stabiliser which will concentrate at the interface between oil and water and which has recurring hydrophobic groups and recurring reactive hydrophilic groups which associate with the second condensation groups.
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Abstract
Particles have a hydrophilic core, for instance including an enzyme and a polymer, surrounded by a shell formed by interfacial condensation polymerisation in the presence of a polymeric stabiliser. Preferably the polymeric stabiliser is a random copolymer which will concentrate at the interface between oil and water and association by ionic interaction, condensation or otherwise is achieved between the stabiliser and one of the reactants before reaction with the other reactant. Dispersions of aqueous capsules in an aqueous medium are also disclosed.
29 Citations
11 Claims
- 1. A particulate composition comprising particles having a hydrophilic core within a shell comprising a membrane comprising an association product of (a) an interfacial condensation product formed by reaction between an oil soluble first IFC reactant having at least two first condensation groups and a water soluble second IFC reactant having at least two second condensation groups and (b) an oil soluble or oil swellable amphipathic polymeric stabiliser which will concentrate at the interface between oil and water and which has recurring hydrophobic groups and recurring reactive hydrophilic groups which associate with the second condensation groups.
Specification