Fibrous support comprising particles containing a partially water-soluble active agent, particles, and methods for producing said particles

Patent metadata

Field	Value
Publication number	US-10449128-B2
Application number	US-201515327732-A
Country	US
Kind code	B2
Filing date	Jul 20, 2015
Priority date	Jul 21, 2014
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

The invention relates to a support consisting of natural and/or synthetic fibers which particles are held, which are preferably water-soluble, comprising at least one active agent, said particles at least partially releasing the active agent(s) under the effect of an external stress, characterized in the active agent has a water-solubility of between 0.1 and 60 wt. %, preferably between 0.1 and 30 wt. %.

First claim

The invention claimed is:

1. A process for the manufacture of a particle provided in the form of:
a) a microcapsule comprising a solid casing including a fluid or solid phase in which at least one active agent is present; or
b) a microsphere comprising a solid matrix in which at least one active agent is present; said active agent having a solubility in water of 0.1% to 60% by weight, wherein the process comprises the steps of:
(A)(i) forming an emulsion from an oily phase comprising fluorinated oil and containing at least one active agent having a solubility in water of 0.1% to 60% by weight, and from an aqueous phase containing silane monomers capable of being condensed for the formation of polysiloxanes; and
(ii) forming a membrane defining a microcapsule by polycondensation of the silane monomers by modifying the pH or the temperature, the oily phase comprising a fluorinated oil being chosen so that the active agent exhibits a high partition coefficient between this oily phase and the aqueous phase, the partition coefficient being defined as the ratio of the concentration of the active agent in the oily phase to the concentration of the active agent in the aqueous phase; and
(B)(i) forming particles by the method (A);
(ii) forming a dispersion of the particles in an aqueous phase containing a water-soluble polymer;
(iii) rendering the initially water-soluble polymer insoluble in order to form polymer condensates which migrate to particle interfaces; and
(iv) treating the polymer condensates thermally or chemically in order to form a casing on the particles.

2. The process of claim 1 , wherein said active agent has a solubility in water of 0.1% to 30% by weight.

3. The process of claim 1 , wherein the casing of the particles is a melamine-formaldehyde polymer.

4. The process of claim 1 , wherein the manufactured particle is resistant to thermal degradation at a temperature of up to and including 120° C.

Assignees

• Satisloh Ag
• Satisloh

Inventors

• Cadet Mamonjy
• Meridiano Camille
• Huilier Hervé
• Callet Adeline

Classifications

• D06M23/12

  Processes in which the treating agent is incorporated in microcapsules (making microcapsules B01J13/02) · CPC title

• C11D17/0039

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

• A61Q19/00

  Preparations for care of the skin · CPC title

• A61K8/11 Primary

  Encapsulated compositions · CPC title

• C11D17/049 Primary

  Cleaning or scouring pads; Wipes · CPC title