Particle with selected permeance wall

Details Particle with selected permeance wall Particle with selected permeance wall

2008-08-06

2011-12-06

Seidleck, James J (Department: 1765)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C428S402210, C264S004700

Reexamination Certificate

active

08071214

ABSTRACT:
The invention discloses a population of selected permeability microcapsule particles comprising an oil soluble or dispersible core material and a wall material at least partially surrounding the core material. The microcapsule wall material comprises the reaction product of a first composition in the presence of a second composition comprising an anionic emulsifier. The first composition comprises a reaction product of i) an oil soluble or dispersible amine with ii) a multifunctional acrylate or methacrylate monomer or oligomer, an oil soluble acid and an initiator. The anionic emulsifier comprises a water soluble or water dispersible acrylic acid alkyl acid copolymer, an optional initiator and an alkali or alkali salt. The reaction product of the first composition and second composition can result in the formation of a low permeability microcapsule wall. Optionally, one or both of the first composition initiator or water phase initiator is an energy-activated initiator, such as a UV initiator. The reaction can proceed by exposing the respective compositions to actinic radiation. Microcapsules of selected permeability can be produced by the process of the invention.

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