Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Polymer containing
Patent
1997-10-31
1999-03-30
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
Polymer containing
424499, 424501, 424502, 424489, A61K 914, A61K 950
Patent
active
058884874
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to opacifiers containing waxes and a mixture of two emulsifiers with different HLB values.
PROR ART
In the formulation of a number of surface-active domestic products, such as for example dishwashing detergents or hair shampoos, particular emphasis is placed on the fact that the products are clear and do not cloud, even in storage. In other cases, products which are cloudy and show a shimmering effect, so-called "pearlescence", are required for the same purpose. A third group of products is produced with a non-pearlescent white haze, in which case so-called opacifiers are used.
In one particularly advantageous embodiment of the invention, the concentrates contain sugar surfactants as hydrophilic surfactants and fatty acid partial glycerides as hydrophobic surfactants in a ratio by weight of 15:1 to 8:1.
Opacifiers are fine-particle dispersions of polymers or solids which, apart from water and/or a polyol (for example glycerol), essentially contain only a wax and a suitable emulsifier. Opacifiers have to meet various requirements. Particular attention is directed, for example, to the solids content which, on the one hand, should be as high as possible to save storage costs but which, on the other hand, has to be low enough to ensure satisfactory rheological behavior of the product. In addition, it is particularly important that the particles of the dispersion should be very fine so that gradual sedimentation is prevented. In addition, a white haze with no pearlescent effect should be formed.
Accordingly, the complex problem addressed by the present invention was to provide opacifier concentrates based on waxes which would be highly concentrated, but low in viscosity, which would produce a white haze in aqueous surfactant solutions and which would be sufficiently stable in storage by virtue of their particle fineness.
DESCRIPTION OF THE INVENTION
The present invention relates to low-viscosity opacifier concentrates based on waxes with a solids content of 40 to 60% by weight which are characterized in that they contain at least one hydrophilic nonionic surfactant with an HLB value above 10 and at least one hydrophobic nonionic surfactant with an HLB value below 10 as emulsifiers.
It has surprisingly been found that it is only the use of mixtures of hydrophilic and hydrophobic nonionic surfactants as the emulsifier system which leads to particularly fine-particle low-viscosity products which, on introduction into surfactant solutions, produce the required white haze instead of the expected pearlescence.
Waxes
Basically, the choice of the wax is not critical. Typical examples are alkylene glycol fatty acid esters, wax esters, hydrogenated triglycerides, saturated fatty alcohols containing 16 to 18 carbon atoms, ethylene oxide adducts with fatty acids containing 16 to 18 carbon atoms and/or paraffin waxes.
Alkylene glycol fatty acid esters
Another preferred embodiment of the invention is characterized by the use as waxes of alkylene glycol fatty acid esters corresponding to formula (I): atoms and 0 and/or 1, 2 or 3 double bonds, R.sup.2 is R.sup.1 CO or is a hydrogen and A is a linear or branched, optionally hydroxy-substituted alkylene group containing 2 to 5 carbon atoms.
These waxes are preferably esters of ethylene glycol or propylene glycol with caproic acid, caprylic acid, 2-ethylhexanoic acid, capric acid, lauric acid, isotridecanoic acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselic acid, linoleic acid, linolenic acid, elaeostearic acid, arachic acid, gadoleic acid, behenic acid and erucic acid and technical mixtures thereof. It is particularly preferred to use ethylene glycol distearate. The quantity of alkylene glycol fatty acid ester used may be from 10 to 30% by weight and is preferably from 15 to 25% by weight, based on the concentrate.
Alkyl and/or alkenyl oligoglycosides
Suitable hydrophilic sugar surfactants with an HLB value above 10 are, for example, alkyl and alkenyl olig
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Ansmann Achim
Baumoeller Guido
Foerster Thomas
Tesmann Holger
Wadle Armin
Henkel Kommanditgesellschaft auf Aktien
J. Murphy Glenn E.
Jaeschke Wayne C.
Page Thurman K.
Shelborne Kathryne E.
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