Microcapsule Clusters
AssigneeEncapsys, LLC
InventorLinsheng Feng
Life of this patent
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Abstract
The present invention teaches a composition and process for irreversibly agglomerated charge stable core shell microcapsules, each microcapsule containing a benefit agent core material, which may be the same or different, the polymeric all or walls comprising one or more (meth)acrylate polymers, or optionally combinations with other polymers, along with a polyvalent cation. The capsules of the invention adhere better to surfaces, are more stable and are useful for delivery of benefit agents.
Claims7
1-13. (canceled)
A process for preparing a cluster of microcapsules encapsulating an oil phase, the cluster being substantially irreversibly agglomerated, the process comprising:
- dispersing an oil soluble amine modified polyfunctional polyvinyl monomer or oligomer and an oil soluble bi- or polyfunctional vinyl monomer or oligomer along with a free radical initiator and an organic acid and a core material into an internal phase oil;
- a first heating step comprising, heating for a time and temperature sufficient to pre-polymerize the amine modified polyfunctional polyvinyl monomer or oligomer and oil soluble bi- or polyfunctional vinyl monomer or oligomer;
- adding to the internal phase oil a water phase in excess comprising a dispersion in water of a polyacrylic or poly(meth)acrylic acid, a free radical initiator, and an emulsifying agent;
- emulsifying the oil phase into the water phase forming an emulsion of droplets of the oil phase dispersed in the water phase;
- heating the emulsion for a time and temperature sufficient to decompose the free radical initiator in the oil and water phases thereby forming microcapsule wall material at the interface of the water and oil phases, the microcapsules encapsulating the oil phase droplets;
- adding a polyvalent cation to the emulsion;
- and,
- further heating for a time sufficient to polymerize the wall material and agglomerate the wall material, the polyvalent cation being incorporated into the microcapsule wall, thereby forming the cluster of microcapsules.
Dependencies are inferred from the claim text.