Microcapsules

Patent metadata

Field	Value
Publication number	US-2016206522-A1
Application number	US-201414908343-A
Country	US
Kind code	A1
Filing date	Jul 28, 2014
Priority date	Jul 29, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A novel microcapsule which is endowed for example with reduced leakage of encapsulated materials. The microcapsule contains one or more fragrances and is suitable for inclusion in non-edible consumer goods products, laundry products, personal care products and cosmetic products. The microcapsule can be obtained in an economic and efficient manner by polymerizing an emulsion so that emulsion droplets are encapsulated into a subsequently cured polymeric shell.

First claim

1 . A microcapsule comprising a perfume composition enclosed within a polymeric shell, wherein:
the perfume composition includes a fragrance, and the polymeric shell includes in polymerized form a blend including:
i) between 40% and 70% by weight over the combined weight of compounds (I) and (II) in the blend of a compound (I) which 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 than 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),

ii) between 30% and 60% by weight over the combined weight of compounds (I) and (II) in the blend of a compound (II) which is a polyethylenically unsatured monomer selected from the group consisting of divinylbenzene, trivinylbenzene, 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.

2 . The microcapsule according to claim 1 , wherein the compound (II) is such that the microcapsule provides for a fragrance leakage of less than 60% when tested upon storage for 4 weeks at 40° C. in a test liquid base, according to a leakage test method, when the microcapsule is prepared according to a leakage test manufacturing procedure, and the microcapsule encapsulates fragrance no. 1, the test liquid base, the leakage test method, the leakage test manufacturing procedure and the fragrance no. 1 being as defined in the examples.

3 . The microcapsule 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 wherein 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 microcapsule according to claim 1 , wherein the polymeric shell further comprises solid colloidal particles having an average primary particle size comprised between 5 nm and 1 μm.

5 . The microcapsule according to claim 1 , wherein the neutral monomethacrylate monomer (Ia) is selected from 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, glycidyl methacrylate, triethylene glycol methyl ether methacrylate; PEG300 methacrylate methyl ether, and mixtures thereof.

6 . The microcapsule according to claim 1 , wherein the neutral monomethacrylate monomer (Ia) includes 2-hydroxyethyl methacrylate.

7 . The microcapsule according to claim 1 , wherein the another neutral monoethylenically unsatured monomer monomer (Ib) includes methyl methacrylate and/or ethyl methacrylate.

8 . The microcapsule according to claim 1 , wherein the compound (II) is a C 2 -C 24 alkyl di- or polyester of (meth)acrylic acid.

9 . The microcapsule according to claim 8 , wherein the compound (II) includes one or more of 1,4-butane diol dimethacrylate, ethylene glycol dimethacrylate and 1,3-propylene glycol dimethacrylate.

10 . The microcapsule according to claim 1 , wherein:
the neutral monomethacrylate monomer (Ia) comprises 2-hydroxyethyl methacrylate; the another neutral monoethylenically unsatured monomer (Ib) is a C 1 -C 24 linear or branched alkyl ester of methacrylic acid and comprises methyl methacrylate and/or ethyl methacrylate; the compound (II) which is a C 2 -C 24 alkyl di- or polyester of methacrylic acid and comprises one or more of 1,4-butane diol dimethacrylate, ethylene glycol dimethacrylate and 1,3-propylene glycol dimethacrylate.

11 . The microcapsule according to claim 1 , wherein the blend is substantially free of any one of (meth)acrylic acid, C 1 -C 24 alkyl monoesters of acrylic acid and C 2 -C 24 alkyl polyesters of acrylic acid.

12 . The microcapsule according to claim 1 , wherein the combined amounts of compounds (I) and (II) make 100% of the weight of the blend.

13 . A water-based dispersion including the microcapsule as defined in claim 1 .

14 . A process for the manufacture of the microcapsule as defined in claim 1 , which is a free radical polymerization process and which includes the following steps:
a) providing an oil-in-water emulsion having an oil phase and a water phase, said oil-in-water emulsion being obtainable by mixing:
a polymerization initiator,
a perfume composition including a fragrance,
an emulsifier, and
the blend as defined in claim 1 ,
b) triggering polymerization within the oil-in-water emulsion obtained in step a), c) letting the polymerization propagate thereby obtaining microcapsules.

15 . A product comprising the microcapsule 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.

Assignees

• Takasago Perfumery Co Ltd

Inventors

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

Classifications

• C11D17/0039

  Coated compositions or coated components in the compositions, (micro)capsules · CPC title

• C11D3/505

  encapsulated or adsorbed on a carrier, e.g. zeolite or clay · CPC title

• A61K2800/412

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

• A61Q5/02

  Preparations for cleaning the hair · CPC title

• B01J13/14

  Polymerisation; cross-linking · CPC title