Microcapsules

Patent metadata

Field	Value
Publication number	US-2016168508-A1
Application number	US-201414908279-A
Country	US
Kind code	A1
Filing date	Jul 28, 2014
Priority date	Jul 29, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A novel aqueous dispersion including a plurality of microcapsules and which contains high fragrance loadings. The dispersion is suitable for inclusion into non-edible consumer goods products, laundry products, personal care products and cosmetic products. The dispersion can be obtained in an economic and efficient manner by polymerizing an emulsion so that emulsion droplets are finally encapsulated into polymeric shells.

First claim

1 . An aqueous dispersion including a plurality of microcapsules, each microcapsule comprising a perfume composition enclosed within a polymeric shell, wherein
the perfume composition includes a fragrance, the polymeric shell includes solid colloidal particles having an average primary particle size comprised between 5 nm and 1 μm, the polymeric shell further includes in polymerized form a monomer blend including:
i) between 30% and 80% by weight over the combined weight of compounds (I) to (II) in the monomer blend of a compound (I) which is a monoethylenically unsatured monomer and/or dimethyldiallyl ammonium chloride,
ii) between 20% and 70% by weight over the combined weight of compounds (I) to (II) in the monomer blend of a compound (II) which is a polyethylenically unsatured monomer, and
wherein the fragrance represents between 20% and 45% by weight over the weight of the aqueous dispersion.

2 . The aqueous dispersion according to claim 1 , wherein a monomer (I) having water solubility at 20° C. greater than 20 g/100 ml is contained as the compound (I) and a monomer (II) having water solubility at 20° C. greater than 20 g/100 ml is contained as the compound (II), and the monomer blend includes more than 15% by weight and less than 60% by weight over the weight of the monomer blend of the monomers (I) and (II).

3 . The aqueous dispersion according to claim 1 , wherein the compound (II) is a polyethylenically unsatured monomer selected from the group consisting of a C 2 -C 24 alkyl di- or polyester of (meth)acrylic acid, a C 2 -C 24 alkyl di- or polyamide of (meth)acrylic acid and mixtures thereof, and the compound (II):
A1. contains two or more (meth)acrylate ester groups or two or more (meth)acrylate amide groups per monomer, and B1. has a molecular weight which, once divided by the number of (meth)acrylate ester or amide groups, gives a value of more than 85 and lower than 135.

4 . The aqueous dispersion according to claim 1 , wherein the fragrance represents between 30% and 45% by weight over the weight of the aqueous dispersion.

5 . The aqueous dispersion according to claim 1 , wherein the compound (I) is selected from (meth)acrylate monomers which are polymerizable through free-radical polymerization.

6 . The aqueous dispersion according to claim 1 , wherein the compound (I) is selected from the group consisting of methacrylic acid, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate and mixtures thereof.

7 . The aqueous dispersion according to claim 1 , wherein the compound (I) is a combination of:
ia) between 50% and 100% by weight over the weight of the combination of a neutral monomethacrylate monomer (Ia) having a solubility in water at pH 7 and 20° C. equal to, or more of 2 g/100 ml, ib) between 0% and 50% by weight over the weight of the combination of another neutral monoethylenically unsatured monomer (Ib), and ic) between 0% and 15% by weight over the weight of the combination of a ionized or ionizable monoethylenically unsatured monomer (Ic).

8 . The aqueous dispersion according to claim 7 , wherein the neutral monomethacrylate monomer (Ia) is selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, glycidyl methacrylate, poly(ethylene glycol) methyl ether methacrylate and mixtures thereof.

9 . The aqueous dispersion according to claim 1 , wherein the compound (II) is a di- or polyester resulting from the esterification of (meth)acrylic acid with a linear or branched polyhydric C 2 -C 24 alcohol and/or C 2 -C 24 polyethylene glycols.

10 . The aqueous dispersion according to claim 9 , wherein the compound (II) comprises one or more of 1,4-butylene glycol dimethacrylate, ethylene glycol dimethacrylate and 1,3-propylene glycol dimethacrylate.

11 . A product comprising the aqueous dispersion as defined in claim 1 , and which is a non-edible consumer goods product, a household cleaner or laundry product, a personal care product or a cosmetic product.

12 . A process for the manufacture of the aqueous dispersion as defined in claim 1 , said process comprising the following steps:
a) providing an oil-in-water emulsion having an oil phase and a water phase, said emulsion being obtainable by mixing:
colloidal particles having an average primary particle size comprised between 5 nm and 1 μm,
a polymerization initiator,
a perfume composition including a fragrance,
an emulsifier, and
the monomer blend as defined in any one of claims 1 to 10 ,
b) triggering polymerization within the oil-in-water emulsion obtained in step a), c) letting the polymerization propagate thereby obtaining microcapsules; wherein the fragrance represents between 20% and 70% by weight of the weight of the oil-in-water emulsion.

13 . Use of solid colloidal particles having an average primary particle size comprised between 5 nm and 1 μm to microencapsulate an oil-in-water emulsion, wherein the oil-in-water emulsion contains a fragrance in an amount comprised between 20% and 70% by weight of the weight of the oil-in-water emulsion.

Assignees

• Takasago Perfumery Co Ltd

Inventors

• Ribaut Tiphaine
• Warr Jonathan
• Fraser Stuart
• Anthony Olivier

Classifications

• C11B9/00 Primary

  Essential oils; Perfumes · CPC title

• A61K2800/412

  Microsized, i.e. having sizes between 0.1 and 100 microns · CPC title

• A61K8/11

  Encapsulated compositions · CPC title

• A61K8/8158

  Homopolymers or copolymers of amides or imides, e.g. (meth) acrylamide; Compositions of derivatives of such polymers · CPC title

• A61K2800/56

  Compounds, absorbed onto or entrapped into a solid carrier, e.g. encapsulated perfumes, inclusion compounds, sustained release forms · CPC title