US 2010/0304023 A1 · WATER-IN-OIL CAPSULE MANUFACTURE PROCESS AND MICROCAPSULES PRODUCED BY SUCH PROCESS

Abstract

A novel method of forming water in oil microcapsules is disclosed. According to the invention microcapsules are obtained by steps comprising dispersing an oil soluble amine modified polyfunctional polyvinyl monomer and an oil soluble bi- or polyfunctional vinyl monomer along with a thermal or UV free radical initiator (optionally included in one or both of the oil or water phases) and an organic acid into an internal phase oil; heating or UV exposing for a time (and temperature) sufficient to oligomerize the amine modified polyfunctional polyvinyl monomer and oil soluble bi- or polyfunctional vinyl monomer forming a pre-polymer. Thereafter the process involves adding to the oil phase oil a water phase comprising a dispersion in water of an anionic emulsifier (and optionally initiator), and adding an emulsifying agent. Emulsifying the water phase into the oil phase (W/O) is controlled through the quantity of water employed. The emulsion is then UV exposed or heated for a time (and temperature) sufficient to decompose the free radical initiators in the oil and/or water phases; thereby forming microcapsule wall material at the interface of the water and oil phases.

Claims16

Dependent claims

A process for preparing microcapsules encapsulating a water phase, the process comprising:

dispersing an oil soluble amine modified ethoxylated trimethylol propane triacrylate and an oil soluble diethylene glycol dimethacrylate along with free radical initiator and an organic acid into an oil phase which is a nonsolvent for the water phase;
the organic acid selected from the group consisting of monoalkyl maleate, alkyl benzene sulfonic acid, and alkyldiphenoxide sulfonic acid;
a first heating step comprising, heating for time and temperature sufficient to oligomerize the amine modified ethoxylated trimethylol propane triacrylate and a diethylene glycol dimethacrylate forming a pre-polymer;
adding to the oil phase a water phase comprising a dispersion in water of a polyacrylic or polymethacrylic acid, a core material, and an emulsifying agent;
emulsifying the water phase into the oil phase forming droplets of the water phase dispersed in the oil phase;
a second heating step comprising, heating for a time and temperature sufficient to decompose at least a portion of the free radical initiator in the oil phase;
thereby forming microcapsule wall material at the interface of the water and oil phases the microcapsules encapsulating the water phase droplets;
and a third heating step comprising heating to at least 90° C. for at least three hours to polymerize the wall material.

5 more elements

A process for preparing microcapsules encapsulating a water phase, the microcapsules obtained by steps comprising:

providing an oil phase and a water phase containing a free radical initiator in at least one of said phases, dispersing an oil soluble amine modified polyfunctional polyvinyl monomer or oligomer and an oil soluble bi- or polyfunctional vinyl monomer or oligomer and an organic acid into the oil phase;
the organic acid selected from the group consisting of monoalkyl maleate, alkyl benzene sulfonic acid, and alkyldiphenoxide sulfonic acid;
adding to the internal phase oil the water phase which further comprises a dispersion in water of an anionic emulsifier, and emulsifying the water phase into the oil phase forming droplets of the water phase in the oil phase;
a first heating step comprising, heating for a time and temperature sufficient to decompose the free radical initiator in at least the oil or water phase, and sufficient to oligomerize or further oligomerize the amine modified polyfunctional polyvinyl monomer or oligomer and oil soluble bi- or polyfunctional vinyl monomer or oligomer forming a pre-polymer and thereby forming microcapsule wall material at the interface of the water and oil phases;
and a second heating step comprising heating to a temperature equal to or greater than the first heating step temperature for a time sufficient to polymerize the wall material.

2 more elements

Dependencies are inferred from the claim text.

Water-in-oil capsule manufacture process and microcapsules produced by such process

Life of this patent

Water-in-oil capsule manufacture process and microcapsules produced by such process

Life of this patent

Abstract

Claims16