Peroxycarboxylic acid-based polyelectrolyte capsule system having a long shelf life

Abstract

A multilayer capsule is comprised of a core-shell structure wherein the core portion comprises at least one organic peroxycarboxylic acid in solid particulate form and the shell portion comprises at least one coating layer comprising a material selected from the group consisting of at least one polyelectrolyte, at least one ionic surfactant or a combination thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation under 35 U.S.C. § 365(c) and 35 U.S.C. § 120 of international application PCT / EP2004 / 006169, filed Jun. 8, 2004, which is incorporated herein by reference in its entirety. This application also claims priority under 35 U.S.C. § 119 of DE 103 27 127.9, filed Jun. 13, 2003, and of DE 103 61 170.3, filed Dec. 22, 2003, each of which is incorporated herein by reference in its entirety.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not Applicable INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC [0003] Not Applicable BACKGROUND OF THE INVENTION [0004] (1) Field of the Invention [0005] The present invention relates to a process for producing a multilayer capsule system laden with at least one organic peroxycarboxylic acid, and also to the capsule system produced in this way itself. The present invention further relates to the use of this capsule system as a bleach or ...

AI Technical Summary

Benefits of technology

[0021] It is a further object of the present invention to provide peroxycarboxylic acids, especially imidoperoxycarboxylic acids, such as phthalimidoperoxycaproic acid (PAP), in storage-stable form. A formulation form of peroxycarboxylic acids shall be developed, which at least substantially prevents or reduces full or partial dissolution of the peroxycarboxylic acids and preferably retains their solid or crystalline state even in the presence of surfactants or in another environment which has dissolution capacity for peroxycarboxylic acids, especially in laundry detergent or cleaning composition formulations, and shall especially at least substantially prevent or at least reduce contact of the peroxycarboxylic acids with the environment.

[0022] Yet a further object of the present invention is the provision of a capsule system which is laden with peroxycarboxylic acids in solid form and leads to good stabilization of the peroxycarboxylic acids and thus to improved storage stability. In particular, a capsule system shall be provided in the context of the present invention, which, especially during the washing operation, is dissolved and / or solubilized or dispersed substantially without residue, so that the release of the peroxycarboxylic acids is not hindered and residues on the laundry are simultaneously prevented. In particular, such a process should enable the production of a capsule system laden with at least one peroxycarboxylic acid as an active substance, which at least substantially avoids the above-outlined disadvantages of the prior art.

Problems solved by technology

Owing to the disadvantages which arise in relation to a change in the laundry detergent or cleaning composition formulation owing to the degradation of imidoperoxycarboxylic acids, especially PAP, attempts have been made in the prior art to effectively encapsulate the imidoperoxycarboxylic acids (e.g., PAP), so that the imidoperoxycarboxylic acid cannot come into direct contact with its environment, especially the remaining components of the laundry detergent or cleaning composition formulation, or the contact of the imidoperoxycarboxylic acids with their environment is reduced.

The use described there of a wax whose melting point is between 40° C. and 50° C. leads to the active substances being released in the wash liquor only at temperatures above the melting point of the wax used, which is disadvantageous against the background of the development of high-performance laundry detergent and cleaning composition formulations and the saving of energy costs, since it should also be possible to wash at about 30° C. Furthermore, the use of a wax with a high melting point has the disadvantage that it causes residues on the laundry especially at low temperatures, since it is not fully emulsified at these temperatures.

It follows from this that the peroxycarboxylic acid can be in direct contact with the environment, especially in the region of the surface of the granules, which is disadvantageous with regard to their stability.

Moreover, these granules are not intended for use in aqueous dispersions, especially liquid laundry detergents and cleaning compositions.

This process is complicated and relatively impracticable on the industrial scale.

Owing to the only low coating layer thicknesses, these systems are unsuitable for the efficient stabilization of peroxycarboxylic acids in aqueous formations with controlled release in the wash liquor.

As is the case in the above-described prior art, the coating layers here too have a thickness only in the molecular range and are applied by means of adsorption from a solution, with the associated process technology disadvantages.

Owing to the only low coating layer thicknesses, these systems are likewise unsuitable for efficient stabilization of peroxycarboxylic acids in aqueous formulations with controlled release in the wash liquor.

Here too, complicated removal of the excess polyelectrolyte molecules is required between the application of the individual coatings.