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Hydroxypropyl Starch Phosphate in surfactant systems

IP.com Disclosure Number: IPCOM000030755D
Publication Date: 2004-Aug-25
Document File: 7 page(s) / 46K

Publishing Venue

The IP.com Prior Art Database

Abstract

Hydroxypropyl Starch Phosphate is used in personal care cleansing systems. It provides benefits in surfactant systems on feel and foam quality, but it is difficult to stabilize in these systems. This invention now allows stabilizing Hydroxypropyl Starch Phosphate in surfactant systems and additionally using its thickening capabilities as well. Unexpectedly, small amounts of STRUCTURE® Plus thickener (Acrylates/Aminoacrylates/ C10-30 Alkyl PEG-20 Itaconate Copolymer) stabilize Hydroxypropyl Starch Phosphate and exhibit thickening synergies with this starch. Additionally, these systems exhibit a high salt tolerance, which is important in cleansing applications.

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TITLE:

Hydroxypropyl Starch Phosphate in surfactant systems

ABSTRACT:

A lot of effort has been spent on stabilizing Hydroxypropyl Starch Phosphate [HPSP] in personal care surfactant systems, where it is found to provide benefits in feel and foam properties. Now we could show that Hydroxypropyl Starch Phosphate can not only be stabilized in these systems by the addition of the STRUCTURE® Plus thickener, but this combination also shows a synergistic effect on viscosity. This technology would be useful for many surfactant-based personal care formulations including shampoos, body wash, facial wash, wet wipes, etc.

SUMMARY OF THE INVENTION:

Hydroxypropyl Starch Phosphate is used in personal care cleansing systems. It provides benefits in surfactant systems on feel and foam quality, but it is difficult to stabilize in these systems. It is already well known that stabilization of HPSP can be achieved with polymeric thickeners (US6248338B1), but without any viscosity build of HPSP. Additionally, those thickeners add an unpleasant feel to a wash formulation that outweighs the benefits added by HPSP.

This invention now allows stabilizing Hydroxypropyl Starch Phosphate in personal care surfactant systems while additionally using its thickening capabilities as well. Unexpectedly, small amounts of STRUCTURE® Plus thickener (Acrylates/Amino-acrylates/C10-30 Alkyl PEG-20 Itaconate Copolymer) stabilize HPSP and exhibit thickening synergies with this starch. Cleansing systems with only 1 % active STRUCTURE® Plus thickener and different levels of HPSP provide viscosities up to 20’000 mPas and have passed stability testing (3 f/t cycles, 3 months at 45 °C). Additionally, surfactant systems with low levels of STRUCTURE® Plus thickener and HPSP can also be thickened with salt, which is commonly used in the personal care industry.

Sensory evaluations were carried out with 9 panelists in a hand wash test using a formulation including Hydroxypropyl Starch Phosphate and STRUCTURE® Plus thickener vs. a formulation containing neither HPSP nor STRUCTURE® Plus thickener but thickened with salt. The HPSP/STRUCTURE® PLUS formulation showed improved feel and foam properties.

Preferably, the personal care compositions is a surfactant based formulation, where the surfactant can be nonionic, amphoteric, cationic and/or anionic surfactants containing any combination in the range of 0.1:5 to 2:5 of STRUCTURE® Plus thickener and Hydroxypropyl Starch Phosphate.

These surfactant based compositions may also contain additional polymers as Polyquaternium-4, such as Celquat®-L200 or Celquat®-H100; Polyquaternium-10 such as Celquat®-SC230M or Celquat®-SC240C; Polyquaternium-4/ Hydroxypropyl Starch Copolymer such as Celquat®-LS-50; Dehydroxanthan gum, such as AMAZE XT, Sodium Styrene Sulfonate, such as FLEXAN® II.

Hydroxypropyl Starch Phosphate may also exhibit stable surfactant based formulations in combination with associative alkali-swellable thickeners, such as Acryl...