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Patent Pick: Enhanced Polyurea Microcapsule Deposition

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Patent Picks are chosen by the editors from publicly available sources. This invention describes a process for preparing polyurea microcapsules for enhanced deposition.

Process for preparing polyurea microcapsules with improved deposition
WIPO Patent Application WO/2015/189309
Publication date: Dec. 17, 2015
Assignee: Firmenich SA

This patent application describes the production and use of perfume- or flavor-containing polyurea microcapsules with improved deposition on surfaces such as fiber, hair and skin. These can be applied in home or personal care products.

According to the inventors, one of the problems faced by the perfume industry lies in the relatively rapid loss of olfactive benefit provided by odoriferous compounds due to their volatility, particularly that of the top-notes. This problem is generally overcome by using a delivery system to release the fragrance in a controlled manner.

Polyurea capsules, formed by polymerization between a polyisocyanate and a polyamine, are well-known but may suffer from a poor deposition. In addition, processes for their preparation cause aggregation.

The present invention provides a solution to such problems by using at least partly aggregated microcapsules that demonstrate improved deposition on target surfaces, while not compromising the processing of such microcapsules.

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