Coated Microcapsules

Patent metadata

Field	Value
Publication number	US-2016177221-A1
Application number	US-201514971645-A
Country	US
Kind code	A1
Filing date	Dec 16, 2015
Priority date	Dec 16, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

Accordingly, there are provided coated microcapsules including a microcapsule, said microcapsules including a polymeric shell and a liquid core material encapsulated therein; and a metallic coating surrounding said microcapsules; wherein the metallic coating includes particles of a first metal adsorbed on said polymeric shell and a film of a second metal formed thereon; and wherein the metallic coating has a maximum thickness of 1000 nm; and methods and formulations related thereto.

First claim

What is claimed is:

1 . A coated microcapsule comprising:
a microcapsule comprising a polymeric shell and a liquid core material encapsulated therein; and a metallic coating surrounding said microcapsule; wherein the metallic coating comprises particles of a first metal adsorbed on said polymeric shell and a film of a second metal formed thereon; and wherein the metallic coating has a maximum thickness of 1000 nm.

2 . A coated microcapsule according to claim 1 , wherein the liquid core material comprises a volatile material.

3 . A coated microcapsule according to claim 1 , wherein the liquid core material comprises a perfume oil, wherein the perfume oil comprises one or more perfume raw materials.

4 . A coated microcapsule according to claim 1 , wherein the liquid core material comprises one or more compounds selected from isopropyl myristate, tri-esters of C 4 -C 24 fatty acids, soybean oil, hexadecanoic acid methyl ester, isododecane, and combinations thereof.

5 . A coated microcapsule according to claim 1 , wherein the polymeric shell comprises a polymeric material selected from the group consisting of polyacrylates, polyethylenes, polyamides, polystyrenes, polyisoprenes, polycarbonates, polyesters, polyureas, polyurethanes, polyolefins, polysaccharides, epoxy resins, vinyl polymers, urea cross-linked with formaldehyde or gluteraldehyde, melamine cross-linked with formaldehyde, gelatin-polyphosphate coacervates optionally cross-linked with gluteraldehyde, gelatin-gum arabic coacervates, cross-linked silicone fluids, polyamines reacted with polyisocyanates, acrylate monomers polymerised via free radical polymerization, silk, wool, gelatine, cellulose, alginate, proteins, and combinations thereof.

6 . A coated microcapsule according to claim 5 , wherein the polymeric shell comprises a polyacrylate.

7 . A coated microcapsule according to claim 6 , wherein the polyacrylate is poly(methyl methacrylate) or poly(ethyl methacrylate).

8 . A coated microcapsule according to claim 1 , wherein the polymeric shell comprises a surface-modifying agent.

9 . A coated microcapsule according to claim 8 , wherein at least some of said particles are adsorbed on said surface-modifying agent.

10 . A coated microcapsule according to claim 8 , wherein the surface-modifying agent is selected from cetyl trimethylammonium bromide (CTAB), poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), and mixtures thereof.

11 . A coated microcapsule according to claim 1 , wherein the particles of the first metal are nanoparticles, wherein said nanoparticles having a particle size of less than 100 nm.

12 . A coated microcapsule according to claim 1 , wherein the first metal is palladium, platinum, silver, gold, copper, nickel, tin or a combination thereof, and wherein the second metal is silver, gold, nickel, copper or a combination thereof.

13 . A coated microcapsule according to claim 1 , wherein the density of said particles on the polymeric shell is such that said particles cover from 0.1 to 80% of the surface area of the polymeric shell.

14 . A coated microcapsule according to claim 1 , wherein (i) the first metal is platinum and the second metal is gold; (ii) the first metal is gold and the second metal is silver; or (iii) the first metal is gold and the second metal is copper.

15 . A coated microcapsule according to claim 1 , wherein the metallic coating has a maximum thickness of 500 nm, and wherein the metallic coating has a minimum thickness of 1 nm.

16 . A coated microcapsule according to claim 1 , wherein the coated microcapsule has a particle size of from 0.1 micron to 500 microns.

17 . A coated microcapsule according to claim 1 , wherein the coated microcapsule retains more than 50% by weight of the liquid core material when tested under the Ethanol Stability Test described herein.

18 . A coated microcapsule according to claim 1 , wherein the coated microcapsule has a fracture strength of from 0.1 MPa to 25 MPa.

19 . A coated microcapsule according to claim 1 , wherein:
i) the liquid core material comprises a perfume oil comprising one or more perfume raw materials; ii) the polymeric shell comprises a polyacrylate, wherein the polyacrylate is selected from poly(methyl methacrylate), poly(ethyl methacrylate), or combinations thereof; iii) the polymeric shell further comprises a surface-modifying agent, wherein the surface-modifying agent is selected from cetyl trimethylammonium bromide (CTAB), poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), and mixtures thereof. iv) (a) the first metal is platinum and the second metal is gold; (b) the first metal is gold and the second metal is silver; or (c) the first metal is gold and the second metal is copper; v) the metallic coating has a maximum thickness of 500 nm and a minimum thickness of 1 nm; vi) the coated microcapsule has a particle size of from 0.1 micron to 500 microns; vii) the coated microcapsule retains more than 50% by weight of the liquid core material when tested under the Ethanol Stability Test described herein; and viii) the coated microcapsule has a fracture strength of from 0.1 MPa to 25 MPa.

20 . A process for preparing a coated microcapsule comprising the steps:
providing a microcapsule comprising a polymeric shell and a liquid core material encapsulated therein; and coating said microcapsule with a metallic coating which surrounds said microcapsule, wherein the metallic coating has a maximum thickness of 1000 nm; wherein the step of coating said microcapsule comprises: adsorbing particles of a first metal on said polymeric shell; and forming a film of a second metal on said particles of the first metal.

Assignees

• Procter & Gamble

Inventors

• Hitchcock James Paul
• Baxter Elaine Alice Marie
• Biggs Simon Richard
• Cayre Olivier Jean
• Dyter Zoë
• Holland Lynette Anne Makins
• Khanolkar Madhuri Jayant
• Rodrigo Gomez Raul
• Tasker Alison Louise
• York David William

Classifications

• C09B67/0097

  Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes · CPC title

• B01J13/22 Primary

  Coating · CPC title

• C11B9/00 Primary

  Essential oils; Perfumes · CPC title

• C11B9/0007

  Aliphatic compounds · CPC title

• C11B9/0019

  carbocylic acids; Salts or esters thereof · CPC title