Silica microcapsules and methods of preparing same
AssigneeInternational Flavors & Fragrances Inc.
InventorsJohn Brahms, Ronald Gabbard, Feng Geng, Julie Ann Wieland, Li Xu, Lewis Michael Popplewell
Life of this patent
Estimating the term…
Abstract
Disclosed is a microcapsule containing: (i) a microcapsule core having an active material, and (ii) a microcapsule wall formed of a first polymer and second polymer. The first polymer is a sol-gel polymer. The second polymer is gum arabic, purity gum ultra, gelatin, chitosan, xanthan gum, plant gum, carboxymethyl cellulose, sodium carboxymethyl guar gum, or a combination thereof. The weight ratio between the first and second polymer is 1:10 to 10:1. Also disclosed are processes for preparing the microcapsule and uses of the microcapsules in consumer products.
Claims7
A process for preparing microcapsules comprising a core containing an active material and a wall, the process comprising
- (a) providing a mixture that contains (i) a polysiloxane having a molecular weight of 1000-9000, (ii) gum arabic, (iii) gelatin, and (iv) a plurality of oil droplets dispersed in an aqueous phase, in which the oil droplets are sized from 1 to 250 μm and contain an active material;
- (b) maintaining the pH of the mixture at 1 to 6 to obtain a microcapsule slurry;
- and
- (c) curing the microcapsule slurry, thereby obtaining microcapsules comprising a core containing an active material and a wall.
Dependencies are inferred from the claim text.