Hydrophilic Liquid Encapsulates
First Claim
1. A process of forming a population of microcapsules comprising a liquid hydrophilic core material and a wall material surrounding the core material, the microcapsule population being formed by:
- providing a hydrophilic liquid core material;
providing an oil continuous phase which has a boiling point greater than at least 100°
C., the oil continuous phase comprising one or more of an organic oil material with carbon chain length up to about 42 carbons and forming a mixture by;
adding an oil soluble or dispersible monofunctional amine acrylate or monofunctional amine methacrylate with a nitrogen content of 5% by weight or greater;
adding a multifunctional acrylate or methacrylate monomer or oligomer;
adding an acid and an initiator;
optionally adding a surfactant;
heating the mixture in the oil continuous phase for a time and temperature sufficient to form a first prepolymer and,dispersing the hydrophilic liquid material in the oil continuous phase forming a blend;
emulsifying the hydrophilic liquid material into the oil continuous phase by subjecting the blend to high shear agitation;
heating the emulsion for a time and temperature sufficient to enable the monofunctional amine acrylate or monofunctional amine methacrylate and the multifunctional acrylate or methacrylate to form a higher molecular weight prepolymer which is cationic and which migrates to the emulsified hydrophilic liquid material, thereby forming microcapsules comprising the higher molecular weight prepolymer being adhered to and surrounding the hydrophilic liquid core material;
heating for a time and temperature sufficient to cross link the prepolymers.
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Accused Products
Abstract
A process of forming a population of microcapsules is described comprising a liquid hydrophilic core material and a wall material at least partially surrounding the core material. The liquid hydrophilic core material can be anionic, cationic, or neutral but polar. The microcapsule population is formed by providing liquid hydrophilic core material; providing an oil continuous phase which is low boiling and preferably nonflammable, the oil continuous phase comprising preferably one or more organic oil materials such as esters with chain length up to about 42 carbons. A mixture is formed by dispersing the liquid hydrophilic material in the oil continuous phase. Either an oil soluble or dispersible monofunctional amine acrylate or monofunctional amine methacrylate, along with acid; or alternatively monofunctional acid acrylate or monofunctional acid methacrylate along with base; or alternatively, monofunctional amine acrylate or monofunctional amine methacrylate along with acid acrylate or methacrylate; is added. A multifunctional acrylate or methacrylate monomer or oligomer is provided along with an initiator. Optionally a surfactant is also added to form the mixture. Emulsification is achieved by subjecting the mixture to high shear agitation and heating the mixture for a time sufficient to enable forming a prepolymer which migrates to the liquid hydrophilic material, thereby forming prepolymers adhered to the hydrophilic core materials. Heating is carried out or light exposure or both for a time and temperature sufficient to crosslink the prepolymers.
44 Citations
22 Claims
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1. A process of forming a population of microcapsules comprising a liquid hydrophilic core material and a wall material surrounding the core material, the microcapsule population being formed by:
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providing a hydrophilic liquid core material; providing an oil continuous phase which has a boiling point greater than at least 100°
C., the oil continuous phase comprising one or more of an organic oil material with carbon chain length up to about 42 carbons and forming a mixture by;adding an oil soluble or dispersible monofunctional amine acrylate or monofunctional amine methacrylate with a nitrogen content of 5% by weight or greater; adding a multifunctional acrylate or methacrylate monomer or oligomer; adding an acid and an initiator; optionally adding a surfactant; heating the mixture in the oil continuous phase for a time and temperature sufficient to form a first prepolymer and, dispersing the hydrophilic liquid material in the oil continuous phase forming a blend; emulsifying the hydrophilic liquid material into the oil continuous phase by subjecting the blend to high shear agitation;
heating the emulsion for a time and temperature sufficient to enable the monofunctional amine acrylate or monofunctional amine methacrylate and the multifunctional acrylate or methacrylate to form a higher molecular weight prepolymer which is cationic and which migrates to the emulsified hydrophilic liquid material, thereby forming microcapsules comprising the higher molecular weight prepolymer being adhered to and surrounding the hydrophilic liquid core material;heating for a time and temperature sufficient to cross link the prepolymers. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 15, 21, 22)
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2. A process for forming a population of microcapsules comprising a liquid hydrophilic core material and a wall material at least partially surrounding the core material, the microcapsule population being formed by:
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providing a hydrophilic liquid core material; providing an oil continuous phase which is low boiling and preferably nonflammable, the oil continuous phase comprising one or more of an organic oil material with chain length up to about 42 carbons; dividing the oil continuous phase into oil 1 and oil 2; dispersing into oil 1 an initiator; dispersing into oil 2 a multifunctional acrylate or methacrylate monomer or oligomer, and an oil soluble or dispersible monofunctional amine acrylate or monofunctional amine methacrylate, and an acid; combining oil 1 and oil 2; forming a mixture by dispersing the liquid hydrophilic material into the oil continuous phase; optionally adding a surfactant; emulsifying the mixture by subjecting the mixture to high shear agitation; heating the mixture for a time sufficient to enable the monofunctional amine acrylate or monofunctional amine methacrylate and the multifunctional acrylate or methacrylate to form a cationic prepolymer which migrates to the liquid hydrophilic material, thereby forming prepolymers adhered to and surrounding the hydrophilic core material.
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12. A process of forming a population of microcapsules comprising a liquid hydrophilic core material and a wall material at least partially surrounding the core material, the microcapsule population being formed by:
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providing hydrophilic liquid core material; providing an oil continuous phase which is low boiling and preferably nonflammable, the oil continuous phase comprising one or more organic oil materials with chain length up to about 42 carbons;
forming a mixture by;adding an oil soluble or dispersible monofunctional acid acrylate or monofunctional acid methacrylate having a —
COOH content by weight of 20% or greater;adding a multifunctional acrylate or methacrylate monomer or oligomer; adding a base and an initiator; optionally adding a surfactant; heating the mixture in the oil continuous phase for a time and temperature sufficient to form a first prepolymer and, dispersing the liquid hydrophilic material in the oil continuous phase forming a blend; emulsifying the liquid hydrophilic liquid material into the oil continuous phase by subjecting the blend to high shear agitation; heating the emulsion for a time sufficient to enable the monofunctional acid acrylate or monofunctional acid methacrylate and the multifunctional acrylate or methacrylate to form a higher molecular weight anionic prepolymer which migrates to the emulsified liquid hydrophilic material, thereby forming microcapsules comprising the higher molecular weight prepolymer adhered to and surrounding the hydrophilic core material; heating for a time and temperature sufficient to crosslink the prepolymers. - View Dependent Claims (14, 16, 17, 18, 19, 20)
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13. A process for forming a population of microcapsules comprising a liquid hydrophilic core material and a wall material at least partially surrounding the core material, the microcapsule population being formed by:
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providing a liquid hydrophilic core material; providing an oil continuous phase which is low boiling and preferably nonflammable, the oil continuous phase comprising one or more organic oil material with chain length up to about 42 carbons; dividing the oil continuous phase into oil 1 and oil 2; dispersing into oil 1 an initiator; dispersing into oil 2 a multifunctional acrylate or methacrylate monomer or oligomer, and an oil soluble or dispersible monofunctional acid acrylate or monofunctional acid methacrylate having a —
COOH content by weight of 20% or greater, and a base;combining oil 1 and oil 2; forming a mixture by dispersing the liquid hydrophilic material into the oil continuous phase; optionally adding a surfactant, emulsifying the liquid hydrophilic liquid material into the oil continuous phase by subjecting the blend to high shear agitation; heating the emulsion for a time sufficient to enable the acid acrylate or methacrylate and the multifunctional acrylate or methacrylate to form a higher molecular weight prepolymer which migrates to the emulsified liquid hydrophilic material, thereby forming microcapsules comprising the higher molecular weight prepolymers adhered to and surrounding the hydrophilic core material; heating for a time and temperature sufficient to crosslink the prepolymers.
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Specification