Benefit-agent-containing delivery particles having high core to wall ratios

Patent metadata

Field	Value
Publication number	US-12146124-B2
Application number	US-202117502388-A
Country	US
Kind code	B2
Filing date	Oct 15, 2021
Priority date	Oct 16, 2020
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

Populations of benefit agent delivery particles are disclosed, the particles having a core and a shell encapsulating the core, the shell comprising certain multifunctional (meth)acrylate-based polymers, along with processes for making and uses of such compositions. The delivery particle has a core to polymer wall ratio by weight from about 96:4 to about 99.5 to 0.5 and a volume-weighted particle size from about 30 to about 50 microns. The compositions deliver core content with a desired delivery profile, such as fragrance delivery at desired touchpoints with higher efficiency. The delivery particle has high pay load, yet exhibits decreased benefit agent leakage, and provides a desired delivery profile.

First claim

What is claimed is:

1. A population of delivery particles, the delivery particles comprising a core and a polymer wall encapsulating said core, wherein:
the core comprises an oily medium comprising a benefit agent and a partitioning modifier wherein the partitioning modifier comprises from 5% to 55% by weight of the core,
the polymer wall comprises a (meth)acrylate polymer derived, at least in part, from
(a) one or more oil-soluble or dispersible multifunctional (meth)acrylate monomers or oligomers and optionally at least one initiator,

the one or more oil-soluble or dispersible multifunctional (meth)acrylate monomers or oligomers having at least six radical polymerizable functional groups, with the proviso that at least one of the radical polymerizable groups is acrylate or methacrylate;
(b) a second monomer comprising a basic (meth)acrylate monomer,

wherein the basic (meth)acrylate monomer selected from the group consisting of ethylaminoethyl acrylate, ethylaminoethyl methacrylate, aminoethyl acrylate, aminoethyl methacrylate, tertiarybutyl ethylamino acrylate, tertiarybutyl ethylamino methacrylate, tertiarybutyl aminoethyl acrylate, tertiarybutyl aminoethyl methacrylate, diethylamino acrylate, diethylamino methacrylate, diethylaminoethyl acrylate diethylaminoethyl methacrylate, dimethylaminoethyl acrylate and dimethylaminoethyl methacrylate;
wherein the basic (meth)acrylate monomer comprises less than 2%, and more than 0%, by weight of the polymer wall; and,
(c) a third monomer comprising an acidic (meth)acrylate monomer,

wherein the acidic (meth)acrylate monomer selected from the group consisting of 2-carboxyethyl acrylate, 2-carboxyethyl methacrylate, 2-carboxypropyl acrylate, 2-carboxypropyl methacrylate, carboxyoctyl acrylate, carboxyoctyl methacrylate, Carboxy substituted aryl acrylates, 2-acryloyloxybenzoic acid, 3-acryloyloxybenzoic acid, 4-acryloyloxybenzoic acid, 2-methacryloyloxybenzoic acid, 3-methacryloyloxybenzoic acid, 4-methacryloyloxybenzoic acid, 4-acryloyloxyphenyl-acetic acid and 4-methacryloyloxyphenylacetic acid,
wherein the acidic (meth)acrylate monomer comprises less than 2%, and more than 0%, by weight of the polymer wall;
said delivery particles having a core to polymer wall ratio by weight from about 96:4 to about 99.5:0.5; and,
said delivery particles having a volume-weighted particle size from about 30 to about 50 microns.

2. The population of delivery particle according to claim 1 , wherein the delivery particles comprise the core and polymer wall present in a weight ratio of from about 97:3 to about 99:1.

3. The population of delivery particles according to claim 1 , wherein the radical polymerizable functional groups are each independently selected from the group consisting of acrylate and methacrylate.

4. The population of delivery particles according to claim 1 , wherein the oil soluble or dispersible multifunctional (meth)acrylate monomer or oligomer comprises a hexafunctional aromatic urethane acrylate.

5. The population of delivery particles according to claim 1 wherein the polymer wall of the delivery particles further comprises a polymeric emulsifier entrapped in the polymer wall.

6. The population of delivery particles according to claim 1 wherein the (meth)acrylate polymer of the polymer wall is further derived, at least in part, from at least one free radical initiator, wherein the at least one free radical initiator comprises i) a water-soluble or water-dispersible free radical initiator, or, ii) a water-soluble or water-dispersible free radical initiator and an oil-soluble or oil-dispersible free radical initiator.

7. The population of delivery particles according to claim 6 , wherein the free radical initiator is present in amount of from about 2% to about 50% by weight of the polymer wall.

8. The population of delivery particles according to claim 1 wherein the benefit per fragrance.

9. The population of delivery particles according to claim 1 wherein the partitioning modifier is selected from the group consisting of isopropyl myristate, vegetable oil, modified vegetable oil, mono-, di-, and tri-esters of C4-C24 fatty acids, dodecanophenone, lauryl laurate, methyl behenate, methyl laurate, methyl palmitate, methyl stearate, and mixtures thereof.

10. The population of delivery particles according to claim 1 wherein the population is characterized by an average volume weighted median fracture strength of from 0.2 to about 10 MPa.

11. The population of benefit agent delivery particles according to claim 1 wherein the polymer wall of the delivery particles further comprises a coating material, wherein the coating material is selected from the group consisting of poly(meth)acrylate, poly(ethylene-maleic anhydride), polyamine, wax, polyvinylpyrrolidone, polyvinylpyrrolidone co-polymers, polyvinylpyrrolidone-ethyl acrylate, polyvinylpyrrolidone-vinyl acrylate, polyvinylpyrrolidone methacrylate, polyvinylpyrrolidone/vinyl acetate, polyvinyl acetal, polyvinyl butyral, polysiloxane, poly(propylene maleic anhydride), maleic anhydride derivatives, co-polymers of maleic anhydride derivatives, polyvinyl alcohol, styrene-butadiene latex, gelatin, gum Arabic, carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, other modified celluloses, sodium alginate, chitosan, casein, pectin, modified starch, polyvinyl acetal, polyvinyl butyral, polyvinyl methyl ether/maleic anhydride, poly(vinyl pyrrolidone/methacrylamidopropyl trimethyl ammonium chloride), polyvinylpyrrolidone/vinyl acetate, polyvinyl pyrrolidone/dimethylaminoethyl methacrylate, polyvinyl amines, polyvinyl formamides, polyallyl amines, copolymers of polyvinyl amines, and mixtures thereof.

Assignees

• Encapsys Llc

Inventors

• Chakar Fadi Selim
• Feng Linsheng
• Neuman Presley Genevie
• Bobnock Robert Stanley
• Smets Johan
• Pintens An
• Domingues Joana Andreia Lameiras

Classifications

• C11D3/3773

  in liquid compositions · CPC title

• C11D3/3765

  in liquid compositions · CPC title

• C11D3/0015

  liquid · CPC title

• B01J13/16

  Interfacial polymerisation · CPC title

• C11D1/62

  Quaternary ammonium compounds · CPC title