Encapsulation

Patent metadata

Field	Value
Publication number	US-10864167-B2
Application number	US-201815960654-A
Country	US
Kind code	B2
Filing date	Apr 24, 2018
Priority date	Oct 27, 2015
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

An improved process of making a benefit agent delivery particle and consumer products incorporating such particles are disclosed. The process comprises the steps of providing a first composition of water phase 1, water phase 2 and water phase 3. Water phase 1 comprises water and an initiator; water phase 2 comprises water, a water-soluble or dispersible amine(meth)acrylate or hydroxyl(meth)acrylate and a multifunctional (meth)acrylate. Water phase 3 comprises water, and carboxyalkyl(meth)acrylate and a base or quaternary ammonium acrylate. The first two water phases are combined to prereact the hydroxy- or amine(meth)acrylate and the multifunctional (meth)acrylate to form a multifunctional hydroxyl-amine(meth)acrylate pre-polymer. The pre-polymer is combined with water phase 3; then an emulsion is formed by emulsifying under high shear agitation a second composition into said first composition; said second composition comprising an oil phase comprising an isocyanate and a benefit agent core material thereby forming a wall surrounding the benefit agent core material.

First claim

What we claim is:

1. A consumer product comprising the combination of a consumer product ingredient and microcapsules, the microcapsules having a shell with surface charge functional groups, the microcapsules made by a process comprising:
dispersing in one or more water phases an initiator, and a cross-linking functional monomer having one or more —OH, —NH 2 , or —NH − groups, and a charge functional monomer having one or more anionic or cationic groups which are selected from carboxy, sulfonic acid, quaternary ammonium groups, or other charged groups;
prereacting the cross-linking functional monomer and the charge-functional monomer in the one or more water phases and combining with a water dispersible multifunctional (meth)acrylate monomer;
further prereacting the cross-linking functional monomers and the charge-functional monomers, forming prereacted monomers;
forming an emulsion by emulsifying into the water phase or phases, using high shear agitation, an oil phase comprising an isocyanate and a benefit agent core material;
optionally adding in addition, an amine cross-linker;
further reacting the combined emulsion of prereacted monomers, water dispersible multifunctional (meth)acrylate monomer, and emulsified oil phase by heating for a time and temperature, or actinic irradiation for a time, sufficient to form a microcapsule shell surrounding the benefit agent core material,
wherein the shell comprises a reaction product of the isocyanate, the prereacted monomers, and the water dispersible multifunctional (meth)acrylate monomer.

2. The consumer product according to claim 1 wherein the cross-linking functional monomer is an amine.

3. The consumer product according to claim 2 wherein the amine is an alkylaminoalkyl(meth)acrylate.

4. The consumer product according to claim 1 wherein the cross-linking functional monomer is hydroxyl functional.

5. The consumer product according to claim 4 wherein the cross-linking functional monomer is a hydroxyl(meth)acrylate.

6. A consumer product comprising the combination of a consumer product ingredient and microcapsules comprising an oil soluble or dispersible benefit agent core material and a shell surrounding the benefit agent core material, the shell comprising a polyurea formed from a first component of an isocyanate and a second component of an amine, the amine comprising the reaction product of an alkylaminoalkyl(meth)acrylate and a multifunctional (meth)acrylate, together with a carboxyalkyl(meth)acrylate or quaternary ammonium acrylate.

7. The consumer product according to claim 6 wherein the amine is tertiary-butylaminoethylmethacrylate.

8. A consumer product according to claim 6 wherein the shell of the microcapsules comprises a reaction product of an isocyanate; and a multifunctional amine (meth)acrylate.

9. The consumer product according to claim 6 wherein the isocyanate is selected from isophorone diisocyanate, 4,4′-methylene diphenyl diisocyanate, 2,2′-methylene diphenyl diisocyanate, and 2,4′-methylene diphenyl diisocyanate.

10. The consumer product according to claim 6 wherein the alkylaminoalkyl (meth)acrylate is selected wherein each alkyl moiety is independently from C 1 to C 8 .

11. The consumer product according to claim 6 wherein the alkylamino (meth)acrylate is selected from tertiary-butylaminoethyl methacrylate, tertiary-butylaminopropyl methacrylate, n-butylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminoethyl methacrylate, diisopropyaminoethyl methacrylate, dibutylaminoethyl methacrylate, dipropylaminoethyl methacrylate, tertiary pentylaminoethyl methacrylate, tertiary hexylaminoethyl methacrylate, tertiary-butylaminopropyl methacrylate, diethylaminopropyl methacrylate, and dimethylaminopropyl methacrylate.

12. The consumer product according to claim 6 wherein the microcapsule has a zeta potential, measured at a pH of 7, of from +70 to −70.

13. The consumer product according to claim 6 wherein the benefit agent core material of the microcapsule is selected from one or more of a fragrance, perfume, phase change material, biological active, antimicrobial, self-healing composition, lubricant or cooling agent.

14. A consumer product comprising the combination of a consumer product ingredient and microcapsules comprising an oil soluble or dispersible benefit agent core material and a shell surrounding the benefit agent core material, the shell comprising a reaction product of an isocyanate; and a multifunctional amine (meth)acrylate, together with a carboxyalkyl(meth)acrylate, wherein the multifunctional amine(meth)acrylate is selected to be polar.

Assignees

• Procter & Gamble

Inventors

• Zhang Hanwei
• Schwantes Todd Arlin
• Hobart Katie Ann
• Williamson Diane Jean

Classifications

• A61K8/11

  Encapsulated compositions · CPC title

• C10M171/06

  Particles of special shape or size · CPC title

• F28D20/023

  the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure · CPC title

• A61K8/8152

  Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers · CPC title

• Y02E60/14

  Thermal energy storage · CPC title