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Non-Spherical Droplet

a droplet and liquid drop technology, applied in the field of liquid droplets, can solve the problems of difficult transfer of liquid absorbed into the carrier material, difficult movement of benefit agent from the carrier material to the substrate, and poor performance of the carrier material

Inactive Publication Date: 2016-08-25
PROCTER & GAMBLE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are a number of problems encountered when using these known methods.
Loaded carrier materials suffer from two issues.
Secondly, even if attachment to the substrate should be successful, movement of the benefit agent from the carrier material to the substrate can be problematic.
This is because the solid carrier material is attached to the substrate, and so the liquid absorbed into the carrier material may not be able to easily transfer as it is not in direct contact with the substrate.
Hence, initial attachment tends to be problematic.
However core-shell particles still suffer from the charge-based adhesion problems and transfer of benefit agent as those of loaded carrier material particles.
For either solid particles or core-shell particles the contact area between particle and substrate is limited because solids tend not to deform much upon contacting a substrate.
This is especially problematic when the substrate has a non-planar surface topography, such as a curved hair or fibre.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0130]The following is an example of making a rod shaped droplet. A mixture of 70 wt % Vaseline™ brand petrolatum, 15 wt % Sigma Aldrich light mineral oil, and 15 wt % Shin Etsu silicone oil (benefit agent) was mixed in a beaker. This was heated up while being mixed until completely melted and homogeneous. A 10 millimolar solution of sodium dodecyl sulfate in water was prepared by mixing 2.9 grams of sodium dodecyl sulfate into a liter of water and mixing until a clear solution was formed.

[0131]Two Harvard Apparatus PHD 2000 syringe pumps were set to a temperature of 65° C. One syringe pump was filled with the homogenous heated mixture and the other with the sodium dodecyl sulfate composition. The pumps were connected to a Dolomite 3000436 microfluidic chip. IDEX FEP 150 micron ID tubing was connected to the outlet of the chip. The outlet tubing of the chip was surrounded with a concentric copper tube heat exchanger around the microfluidic chip's outlet tubing and its outer tube con...

example 2

[0133]The following is an example of making a rod shaped droplet. A mixture of 70 wt % Vaseline™ brand petrolatum, 15 wt % Sigma Aldrich light mineral oil, and 15 wt % Shin Etsu silicone oil (benefit agent) was mixed in a beaker. This was heated up while being mixed until completely melted and homogeneous.

[0134]IDEX FEP 150 micron ID tubing was connected to the outlet of a New Era Pump Systems metal syringe. The syringe was connected to a syringe pump. An Omega heating tape was wrapped around the syringe and set to a temperature of 61° C. The homogenous mixture was pumped through the apparatus and rod shaped droplets collected in a beaker comprising a 10 millimolar solution of sodium dodecyl sulfate in water. Alternatively, the Shin Etsu silicone oil was replaced with 15 wt % Arch Chemicals zinc pyrithione.

example 3

[0135]Rod-shaped droplets were made as described in Example 1 above. An aqueous composition comprising 1.6 wt % linear alkyl benzene sulfonate, 0.4 wt % of hydrogenated castor oil crystals, 10.07 wt % borax and 0.2 wt % NaOH. The aqueous composition had a yield stress of 1 Pa. To this the rod-shaped liquid droplets were added to a concentration of 1 wt % to make a liquid droplet composition. At a yield stress of 1 Pa, the aqueous composition was such that it prevented aggregation of the liquid droplets (which would give a false positive), yet was not too viscous to pump.

[0136]The liquid droplet composition was divided in half and one of the two resulting samples was heated to a temperature above 60° C. for 15 minutes to melt the internal solid material. Upon melting, the rod-shaped droplets assumed a spherical shape (since the interfacial tension is no longer offset by an internal structure).

[0137]A volume of 1 ml of the composition being tested was then pushed through a 25 mm Stain...

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Abstract

Non-spherical liquid droplets comprising a liquid, an internal solid material defining the shape of the droplet, a benefit agent, and methods of making non-spherical liquid droplets.

Description

FIELD OF THE INVENTION[0001]The present invention relates to liquid droplets comprising internal solid material and to methods of making said liquid droplets.BACKGROUND OF THE INVENTION[0002]Benefit agents, such as perfumes, enzymes and the like are often delivered to a substrate in the form of a droplet or particle. Such delivery can be achieved by using a liquid droplet which can exist within another liquid or within the air, such as an aerosol for example. Another method is via a loaded solid carrier material such as zeolite or starch. In this case the benefit agent usually exists as a liquid which is applied to the carrier material and is absorbed within the solid particle. A final approach is via core-shell particles, in which the benefit agent is a component of a liquid core which is surrounded by a solid shell. However, there are a number of problems encountered when using these known methods.[0003]Loaded carrier materials suffer from two issues. The first is the ability to a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01F17/00A61K8/06A61K8/02C09K23/00
CPCA61K8/31A61K8/463A61K8/466A61K8/922A61K2800/10A61K8/06A61K8/0204A61K8/066A61K8/064A61Q19/00B01F17/00C09K23/00C09K23/54A61K8/19A61K8/46A61K8/89A61K2800/592A61K2800/83B01J13/08
Inventor SPICER, PATRICK THOMASCAGGIONI, MARCOLENIS-ABRIL, JESSICABAYLES, ALEXANDRA VICTORIA
Owner PROCTER & GAMBLE CO