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Process for the preparation of powders from slurries of fragranced aminoplast capsules

A slurry and plastic technology, applied in microcapsule preparation, perfume preparation formulation, food preparation, etc., can solve the problem that powder is difficult to wash off

Active Publication Date: 2011-09-14
FIRMENICH SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the resulting powder is described in the literature as free flowing, in our experience this spray dried powder is sticky and difficult to wash off from the spray dryer

Method used

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  • Process for the preparation of powders from slurries of fragranced aminoplast capsules
  • Process for the preparation of powders from slurries of fragranced aminoplast capsules
  • Process for the preparation of powders from slurries of fragranced aminoplast capsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Preparation of aqueous slurry of melamine-formaldehyde microcapsules

[0065] a) Perfumed melamine-formaldehyde capsules were prepared by the method described in US Patent 5,162,486. The resulting microcapsule slurry contained 40% by weight microcapsules, and 32% by weight encapsulated fragrance. A typical encapsulated fragrance POLYNESIA CP 147869H (woody, floral; source: Firmenich SA) has a flash point of 97°C.

[0066] The fragranced microcapsules are available from Firmenich SA under the trade name PopScent purchased.

[0067] The content of the capsules of the slurry was determined by analyzing their dry solids using a Sartorius microwave balance (Model MMA 30).

[0068] The content of encapsulated fragrance was determined by hydrodistillation.

[0069] The particle size of the microcapsules in the slurry was about 2-3 microns, as determined by a Malvern particle size analyzer.

[0070] No thickening polymer was added to the slurry. In order to avoid separ...

Embodiment 2

[0076] Preparation of Melamine-Formaldehyde Microcapsule Powder

[0077] To 100 parts by weight of the slurry of aminoplast microcapsules from step a) of Example 1 was added 52 parts by weight of 20% aqueous solutions of the different modified starches listed in Table I below. The mixture was neutralized to pH 5 with citric acid (50% aqueous solution).

[0078] The aqueous dispersion of microcapsules thus obtained was then spray-dried on a Büchi spray dryer Model B 290.

[0079] The inlet temperature of the spray dryer is 185°C to 190°C, and the outlet temperature is 95°C to 105°C. A bi-directional nozzle with a nozzle diameter of 0.7 mm was used.

[0080] Table I

[0081]

[0082] Add Capsul to aqueous slurry and Purity Gum produced more than those adding Litesse to an aqueous dispersion of microcapsules Ultra and Glucidex The obtained powder has a more uniform particle size distribution and a smaller average particle size spray-dried powder.

[0083] Analytica...

Embodiment 3

[0089] Preparation of Melamine-Formaldehyde Microcapsule Powder

[0090] Using the microcapsule slurry prepared in Example 1, the same assays as those described in Example 5 were carried out with the ingredients listed in Table II in the amounts indicated.

[0091] The dispersion obtained was then spray dried on a Büchi spray dryer Model B 290.

[0092] The temperature of the inlet air in the spray dryer is 185°C to 190°C, and the temperature of the outlet air is 95°C to 105°C. A bi-directional nozzle with a nozzle diameter of 0.7 mm was used.

[0093] The results of these tests are listed in Table II.

[0094]

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PUM

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Abstract

A process for the preparation of powder products via spray-drying, in a generally known manner, of aqueous dispersions, or slurries, of aminoplast microcapsules comprising an encapsulated oil, wherein, prior to being submitted to spray-drying, there is added to said slurry a de-tackifying colloid in an appropriate amount and the pH of the slurry thus obtained is adjusted to a value comprised between 4 and 6 by means of an acid. This process makes it possible to obtain powders that are particularly useful to impart pleasant and useful properties, namely fragrance and antibacterial or malodor counteracting properties, to consumer products wherein the incorporation of aqueous media or compositions is undesirable and affects the physical structure of the consumer product.

Description

technical field [0001] The present invention relates to the fragrance industry and the consumer goods industry. More particularly it relates to a method of producing a powder from a slurry of aminoplast (more specifically melamine-formaldehyde) capsules containing perfume and other hydrophobic materials. The invention also relates to the powder product thus obtained having novel physical and chemical properties, and to the use of this powder in consumer products. A consumer product containing this powder in melamine-formaldehyde capsules is also an object of the invention. Background technique [0002] A large number of literatures report the use of melamine-formaldehyde resins in the encapsulation of active substances and in particular mention the potential use of this encapsulation system in fragrance and cosmetic applications. Amino resin-based capsules, commonly referred to as aminoplast capsules, are therefore the subject of numerous literature reports and patent appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D3/50C11D3/37C11D11/02A61K8/11B01J13/02A23L1/00A23L1/22A23L27/00
CPCA61Q13/00A61Q19/00A23L1/22016C11D3/3703A61Q15/00A61K8/11C11D3/505A61Q5/00A61K2800/412C11D11/02A23L27/72
Inventor 格伦·韦尔霍夫尼克阮文恭
Owner FIRMENICH SA