Delayed release delivery systems and methods

Abstract

A delayed release delivery system comprises a hydrophilic core particle having surface pores and containing a liquid. The particle is encapsulated in a polymer having a hydrophobic backbone and hydrophilic pendant groups. At least some of the surface pores adjacent the hydrophilic pendant groups are blocked in the presence of water and unblocked in the absence of water. The treated particle contains liquid in a weight ratio of the liquid to the porous core particle of at least 400:1.

Description

technical field [0001] The present invention relates to particles useful as a sustained delivery system for fragrance or skin benefit ingredients, scalp benefit ingredients and hair benefit ingredients, methods for making these particles, and compositions comprising these particles. More specifically, the particles absorb fragrances or actives and gradually release these fragrances or actives over a longer period of time. Background technique [0002] Fragrances are used in various products to enhance the enjoyment of consumers while using these products. The desire to produce such products has long been recognized: after they have been applied to the skin, scalp or hair, their fragrance lasts long. Despite many efforts in this regard, most commercial products for skin, scalp and hair initially have a strong, pleasant smell, but disappointingly tend to lose their scent within minutes of application . Attempts to solve this problem have included the use of inorganic carrie...

AI Technical Summary

Problems solved by technology

Despite many efforts in this regard, most commercial products for skin, scalp and hair initially have a strong, pleasant smell, but disappointingly tend to lose their scent within minutes of application