Delivery particle
View Patent ↗The present application relates to encapsulated benefit agents, compositions comprising such encapsulated benefit agents and processes for making and using compositions comprising such encapsulated benefit agents that do not require or require a reduced amount of scavenger materials. Such encapsulated benefit agents, compositions comprising such encapsulated benefit agents are processed such that no or lower levels of scavenger materials are required.
1. A process comprising:
separating shell particles from encapsulated benefit agents in a benefit agent delivery composition under conditions sufficient to reduce the percentage of said shell particles in said benefit agent delivery composition by at least 20%,
said separating step being selected from one or more of centrifuging, filtering, solvent exchanging, flash evaporating, decanting, flotation separating, spray drying, reactive adsorbing, reactive absorbing, and electrophoreticly separating,
wherein the benefit delivery composition comprises one or more encapsulated benefit agents without scavenger materials and greater than 0.1% shell particles, said shell particles comprising a residual by-product of an encapsulation process.
2. The process of claim 1 wherein the separating step comprises centrifuging, said centrifuging comprising a process selected from the group consisting of:
a.) batch centrifuging comprising applying a centrifugal force in multiples of gravity of from about 100 to about 20,000 multiples of gravity to said benefit agent delivery composition;
b.) continuous centrifuging having at least one of the following process parameters
(i) a centrifugal force in multiples of gravity of from about 100 to about 20,000 multiples of gravity to said benefit agent delivery composition;
(ii) an inlet fluid viscosity of from about 0.1 to about 2000 centipoise; an inlet velocity of the benefit agent delivery composition of from about 0.2 to about 5 meters per second;
(iii) an the inlet pressure of the benefit agent delivery composition of from about 10 psig to about 120 psig; and/or
(iv) a pressure drop across the continuous centrifuge, from inlet to outlet, of from about 3 to about 50 psig; and
(v) a solids concentration of the benefit agent delivery composition of from about 0.5 to 90%; and
c.) combinations thereof.
3. The process of claim 1 further comprising continuous process parameters comprising:
a.) a centrifugal force in multiples of gravity of from about 100 to about 20,000 multiples of gravity to said benefit agent delivery composition;
b.) an inlet fluid viscosity of from about 0.1 to about 2000 centipoise;
c.) an inlet velocity of the benefit agent delivery composition of from about 0.2 to about 5 meters per second;
d.) an the inlet pressure of the benefit agent delivery composition of from about 10 psig to about 120 psig;
e.) a pressure drop across the continuous centrifuge, from inlet to outlet, of from about 3 to about 50 psig;
f.) a solids concentration of the benefit agent delivery composition of from about 0.5 to 90%.
4. The process of claim 1 wherein the separating step comprises filtering by a process selected from the group consisting of batch filtering, continuous filtering and combinations thereof, said process comprising at least one of the following process parameters:
a.) a pressure differential across a filter media, said filter media having a median pore size is from about 10 kilo Dalton to about 30 microns;
b.) a pressure differential across a filter media of from about 5 psig to about 100 psig;
c.) a permeate removal rate of from about 0.1 kg/min/ft 2 to about 50 kg/min/ft 2 .
5. The process of claim 4 comprising the following process parameters:
a.) a pressure differential across a filter media, said filter media having a median pore size is from about 10 kilo Dalton to about 30 microns;
b.) a pressure differential across a filter media of from about 5 psig to about 100 psig; and
c.) a permeate removal rate of from about 0.1 k g/min/ft 2 to about 50 kg/min/ft 2 .
6. The process of claim 1 wherein the separating step comprises drying said benefit agent delivery composition, said drying comprising atomizing said benefit agent delivery composition to form benefit agent delivery composition droplets having a droplet size of from about 2 microns to about 200 microns, said droplets being atomized in an atomization unit having at least one inlet and one outlet, at least one of said inlets having an inlet air temperature of from about 100° C. to about 280° C., at least one of said outlets having an outlet air temperature of from about 50° C. to about 130° C.
7. The process of claim 1 wherein the separating step comprises one or both of adsorbing and absorbing comprising contacting the benefit agent delivery composition with a adsorption and/or absorption media for from about 5 minutes to about 500 minutes, at a benefit agent delivery composition temperature of from about 20° C. to about 110° C., and then separating said adsorption and/or absorption media and said benefit agent delivery.
8. The process of claim 1 wherein the separating step comprises one or both of floating and decanting wherein the benefit agent delivery composition is permitted to separate into two or more benefit agent delivery composition components, one of said components comprising the majority of said shell particles and a second component comprising the majority of said encapsulated benefit agents, said second component comprising said majority of said encapsulated benefit agent is separated from the remainder of said benefit agent delivery components.
9. The process of claim 1 comprising encapsulating the benefit agents by transforming two or more monomeric materials into one or more macromolecules to encapsulate the benefit agents, and wherein the by-product comprises the one or more of the monomeric materials and the macromolecules.
10. The process of claim 9 , wherein the shell particles are devoid of the benefit agents.
11. The process of claim 1 comprising reacting at least one amine selected from urea and melamine, and at least one aldehyde selected from formaldehyde and gluteraldehyde to generate an encapsulate to encapsulate the benefits agents, and wherein the by-product comprises one or more of the amine, the aldehyde, and reaction products of the amine and aldehyde.
12. The process of claim 11 , wherein the by-product comprises formaldehyde.