Polyamide-based microcapsules
OwnerLaura ETCHENAUSIA, Anaick NICOLAE +3inventors
InventorsLaura ETCHENAUSIA, Anaick NICOLAE, Marlène JACQUEMOND, Valentina VALMACCO, Lahoussine OUALI
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Abstract
The present invention relates to a new process for the preparation of polyamide-based microcapsules. Polyamide-based microcapsules are also an object of the invention. Perfuming compositions and consumer products comprising said microcapsules, in particular perfumed consumer products in the form of home care or personal care products, are also part of the invention.
Claims15
1- A process for preparing a polyamide-based core-shell microcapsule slurry comprising the following steps:
- a) Dissolving at least one acyl chloride in a hydrophobic material, preferably a perfume to form an oil phase;
- b) Dispersing the oil phase obtained in step a) into a dispersing phase to form a two-phases dispersion;
- c) Performing a curing step to form polyamide-based microcapsules in the form of a slurry;
- wherein at least one amino-compound A chosen in the group consisting of ethylene amine having a functionality greater than 3, an aminosilane, a polyethylenimine, an amino-acid and mixtures thereof, is added in the dispersing phase before the formation of the two-phases dispersion and/or in the two-phases dispersion obtained after step b).
2- The process according to claim 1, wherein the amino-compound A is chosen in the group consisting of triethylenetetramine, tetraethylenepentamine and mixture thereof.
3- The process according to claim 1 or 2, wherein a carbohydrate is added in the oil phase and/or in the dispersing phase, preferably in the dispersing phase.
4- The process according to claim 3, wherein the carbohydrate is a polysaccharide chosen from the group consisting of anionic salt of alginic acid, pectin, lignin, anionic modified starch, carboxymethylcellulose, carrageenan and mixtures thereof.
5- The process according to anyone of the preceding claims, wherein a polymer, is added in the oil phase.
6- The process according to claim 5, wherein the polymer is a protein, preferably selected from the group consisting of canola protein, sunflower seed protein, potato protein, chickpea protein, pea protein, algae protein, faba bean protein, barley protein, oat protein, wheat gluten protein, lupin protein, soy protein, rice protein, whey protein, white egg albumin, casein, sodium caseinate, gelatin, bovine serum albumin, hydrolyzed soy protein, hydrolyzed sericin, pseudocollagen, silk protein, sericin powder, and mixtures thereof.
7- The process according to anyone of the preceding claims, wherein at least one amino-compound B is added in the dispersing phase before the formation of the two-phases dispersion and/or in the two-phases dispersion obtained after step b).
8- The process according to claim 7, wherein the amino compound B is an amino-acid, preferably chosen in the group consisting of lysine, arginine, leucine, histidine, tryptophane, serin, glutamine, threonine, alanine, asparagine, aspartic acid, cysteine, glutamic acid, glycine, isoleucine, methionine, phenylalanine, proline, tyrosine, valine.
9- The process according to anyone of the preceding claims, wherein the dispersing phase comprises a base, preferably chosen in the group consisting of sodium carbonate, sodium bicarbonate, sodium hydroxide, guanidine carbonate, triethanolamine, and mixtures thereof.
10- The process according to anyone of the preceding claims, wherein the acyl chloride is a compound of formula (I)
- wherein n is an integer varying between 1 and 8, preferably between 1 and 6, more preferably between 1 and 4, and
- wherein X is an (n+1)-valent C2 to C45 hydrocarbon group optionally comprising at least one group selected from (i) to (xi)
- wherein R is a hydrogen atom or an alkyl group such as a methyl or an ethyl group, preferably a hydrogen atom.
11- A polyamide-based core-shell microcapsule comprising:
- a core, preferably an oil-based core, comprising a hydrophobic material, preferably a perfume, and
- a polyamide-based shell comprising a reaction product of:
- an acyl chloride,
- an amino compound A chosen in the group consisting of ethylene amine having a functionality greater than 3, an aminosilane, a polyethylenimine, amino-acid, and mixtures thereof,
- optionally a carbohydrate,
- optionally an amino compound B, and
- optionally a polymer, preferably a protein.
12- The polyamide-based core-shell microcapsule according to claim 11, wherein the shell comprises:
- between 5 and 40%, preferably between 5 and 35% by weight of acyl chlorides moieties, preferably reacted acyl chlorides moieties,
- optionally between 5 and 60%, preferably between 10 and 50% by weight of a carbohydrate, preferably reacted carbohydrate,
- optionally between 30 and 80%, preferably between 40 and 65%, more preferably between 40 and 60% by weight of a polymer, preferably reacted polymer,
- between 1 and 40%, preferably between 3 and 30%, more preferably between 6 and 30% by weight of amino compound(s),
- based on the total weight of the shell.
13- A perfuming composition comprising
- (i) microcapsule as defined in claim 11 or 12, wherein the hydrophobic active ingredient comprises a perfume,
- (ii) At least one ingredient selected from the group consisting of a perfumery carrier and a perfumery base
- (iii) Optionally at least one perfumery adjuvant.
14- A consumer product comprising:
- a personal care active base, and
- microcapsule as defined in claim 11 or 12 or the perfuming composition as defined in claim 13,
- wherein the consumer product is in the form of a personal care composition.
15- A consumer product comprising:
- a home care or a fabric care active base, and
- microcapsule as defined in claim 11 or 12 or the perfuming composition as defined in claim 13,
- wherein the consumer product is in the form of a home care or a fabric care composition.