Process for the production of storage stable wax dispersions

Details Process for the production of storage stable wax dispersions Process for the production of storage stable wax dispersions

1996-04-29

1998-03-03

Page, Thurman K.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

424 701, 424 63, 514937, 514943, 514941, 81156, A61K 706, A61K 748

Patent

active

057231370

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a process for the production of wax dispersions under conditions which lead to fine-particle long-life dispersions.
2. Discussion of Related Art
It is known that oil-in-water emulsions (hereinafter referred to as o/w emulsions) prepared with nonionic emulsifiers and stabilized undergo phase inversion on heating. As result of the phase inversion process, the outer aqueous phase becomes the inner phase at relatively high temperatures. This process is generally reversible, i.e. the original emulsion type is reformed on cooling. It is also known that the position of the phase inversion temperature depends on many factors, including for example the type and phase volume of the oil component, the hydrophilicity and structure of the emulsifier or the composition of the emulsifier system, cf. for example K. Shinoda and H. Kunieda in Encyclopedia of Emulsion Technology, Volume I, P. Becher (ed.), Marcel Decker, New York 1983, pages 337 et seq.
DE-A-38 19 193 describes a process for the production of low-viscosity o/w emulsions by the phase inversion technique. In this process, the phase inversion technique is applied to mixtures containing an oil component, a nonionic emulsifier and a co-emulsifier in aqueous medium. The oil component is said to consist of 50 to 100% of special mono- or diesters, 0 to 50% of C.sub.8-22 fatty acid triglycerides and optionally 0 to 25% of a hydrocarbon.
DE-A-41 40 562 describes a process for the production of o/w emulsions containing particularly polar oils by the phase inversion technique. Particularly polar oils are understood to be oils which have a dipole moment above 1.96 D. In this process, the technique of phase inversion is applied to mixtures containing the particularly polar oils mentioned, a nonionic emulsifier, optionally a co-emulsifier and an interfacial moderator selected from the group of tocopherols, Guerbet alcohols containing 16 to 20 carbon atoms or asteroid containing 1 to 3 OH groups.
DE-A-38 19 193 and DE-A-41 40 562 do not disclose any other components beyond those mentioned. In particular, these documents do not contain any reference to whether and by what measures fine-particle long-life wax dispersions can be produced.


DESCRIPTION OF THE INVENTION

The problem addressed by the present was to provide a process for the production of fine-particle long-life wax dispersions.
According to the invention, the solution to this problem is characterized in that value of 8 to 18 and fatty alcohols containing 12 to 22 carbon atoms or partial esters of polyols containing 3 to 6 carbon atoms with fatty acids containing 12 to 22 carbon atoms, range from 0.5:1 to 20:1, in the presence of 15 to 85% by weight of water to a temperature above the melting point of the mixture of components (A) to (C) and the dispersion obtained is subsequently heated to a temperature within or above the phase inversion temperature range--or the dispersion is directly prepared at that temperature--and is then cooled to a temperature below the phase inversion temperature range and optionally further diluted with water.
Accordingly, the present invention relates to a process for the production of wax dispersions, in which value of 8 to 18 and fatty alcohols containing 12 to 22 carbon atoms or partial esters of polyols containing 3 to 6 carbon atoms with fatty acids containing 12 to 22 carbon atoms, range from 0.5:1 to 20:1, in the presence of 15 to 85% by weight of water to a temperature above the melting point of the mixture of components (A) to (C) and the dispersion obtained is subsequently heated to a temperature within or above the phase inversion temperature range--or the dispersion is directly prepared at that temperature--and is then cooled to a temperature below the phase inversion temperature range and optionally further diluted with water.
The process according to the invention has the advantage that particularly fine-particle dispersions with excellent stability in storage are obtained. In addition, by c

REFERENCES:
patent: 4379755 (1983-04-01), Yamada
patent: 4446127 (1984-05-01), Buchler et al.
patent: 5028265 (1991-07-01), Schmidt-Thuemmes et al.
patent: 5196417 (1993-03-01), Dolling
Encyclopedia of Emulsion Technology, vol. I, P. Becher (ed.), Marcel Decker, New York 1983, p. 337 et seq.
O.-A. Neumuller, "Rompps Chemie-Lexikon". 7th Edition, Stuttgart 1977, p. 3857.
Zeitschrift fur Lebensmitteltechnologie, 1979, vol. 30(6), pp. 256-264.
"Emulgatoren fur Lebensmittel", Springer-Verlag, 1985 (reference unavailable).
Rompps Chemie-Lexikon, O.-A. Neumuller (ed.) 7th Edition Stuttgart 1977, p. 3615 et seq.
Soap Cosm. Chem. Spec. 1987 (4) p. 52.
Rompps Chemie-Lexikon, 7th Edition, Stuttgart 1975, pp. 3336 et seq.

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