Abstract: A method of encapsulation of an active comprising (a) dispersing an active in an aqueous medium having a pH of less than 6; (b) causing the formation on this dispersed active of a polymer shell, the formation comprising the sequential deposition of a series of polymeric layers, each layer being capable of hydrogen bonding with the preceding layer; to form an aqueous slurry of active-containing capsules; characterised in that one of the first two layers is a polycarboxylic acid and that the first two to four layers taken together exhibit an interfacial compression dilation modulus of greater than 10 mN/m. The method allows the precise tailoring of polymeric shells, allowing capsules walls to be much thinner without a loss of strength. The technique is especially useful for the encapsulation of fragrances and flavours.

Abstract: Core-shell capsules comprising a fragrance-containing core and a shell formed around said core, wherein the shell is formed of polycarboxylic acid having a molecular weight of 1,000 to 10,000,000 Daltons

Abstract: A microcapsule composition consisting essentially of core material enclosed in a shell, wherein the shell comprises a complex coacervate formed from at least two oppositely charged colloids, one of which is a protein, and wherein the protein is cross linked to a hardening agent by amide groups.

Abstract: Core-shell capsules comprising a fragrance-containing core and a shell formed around said core, wherein the shell is formed of polycarboxylic acid having a molecular weight of 1,000 to 10,000,000 Daltons

Abstract: A method of encapsulation of an active comprising (a) dispersing an active in an aqueous medium having a pH of less than 6; (b) causing the formation on this dispersed active of a polymer shell, the formation comprising the sequential deposition of a series of polymeric layers, each layer being capable of hydrogen bonding with the preceding layer; to form an aqueous slurry of active-containing capsules; characterised in that one of the first two layers is a polycarboxylic acid and that the first two to four layers taken together exhibit an interfacial compression dilation modulus of greater than 10 mN/m. The method allows the precise tailoring of polymeric shells, allowing capsules walls to be much thinner without a loss of strength. The technique is especially useful for the encapsulation of fragrances and flavours.

Abstract: A method of forming active-containing microcapsules by the steps of (i) emulsifying the active in water in the presence of a polymeric emulsifier; (ii) adding to the emulsion thus formed a blend of at least 2 silanes and hydrolysing them prior to (iii) forming a shell by increasing the pH characterised in that (iv) the polymeric emulsifier also acts as a templating agent for the organosilicon compounds; (v) the silanes are compounds of the Formula I in which R is independently C1-C4 linear or branched alkyl or alkene, optionally comprising a functional group selected from amino and epoxy, m is from 1-4, and selected such that there is present at least 2 silanes with different functionalities m. The resulting microcapsules have excellent properties, and are especially effective for use with fragrances.

Abstract: A method of forming active-containing microcapsules by the steps of (i) emulsifying the active in water in the presence of a polymeric emulsifier; (ii) adding to the emulsion thus formed a blend of at least 2 silanes and hydrolysing them prior to (iii) forming a shell by increasing the pH characterised in that (iv) the polymeric emulsifier also acts as a templating agent for the organosilicon compounds; (v) the silanes are compounds of the Formula I in which R is independently C1-C4 linear or branched alkyl or alkene, optionally comprising a functional group selected from amino and epoxy, m is from 1-4, and selected such that there is present at least 2 silanes with different functionalities m. The resulting microcapsules have excellent properties, and are especially effective for use with fragrances.