Compositions – Preservative agents – Anti-corrosion
Patent
1991-07-11
1992-09-08
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
252308, 2523151, 252351, 424 59, 524539, 106271, B01F 1742, A61K 700, A61K 910
Patent
active
051456036
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an aqueous dispersion of a meltable fat which is flowable and pumpable at normal temperature and which contains a large quantity of up to 60% by weight of the fat and a relatively small quantity of up to 1% by weight of a nonionic emulsifier.
2. Statement of Related Art
Fats are used for the production of numerous liquid, aqueous and emulsion-form preparations for cosmetic, pharmaceutical or industrial purposes, influencing the properties of these preparations in dispersed form. The incorporation of fats, which are wax-like substances solid at normal temperature, requires melting and uniform stable dispersion in a similarly heated solution or emulsion of the other components. This procedure involves considerable effort, so that it would be of advantage for many users if the fats in question were already available in the form of a stable dispersion concentrate which could be homogeneously dispersed in other aqueous preparations simply by mixing.
Pumpable dispersions of fatty alcohols containing 10 to 25% by weight linear C.sub.14-22 fatty alcohols and 0.01 to 1.0% by weight of a cationic emulsifier were already known from EP 282 864 A 1.
However, cationic dispersions of this type are relatively unsuitable for use in aqueous media containing anionic surfactants or polymers because they cause separations. In addition, it appeared desirable stably to disperse more than 25% by weight of the solid to enable dispersions of the type in question to be transported and stored at relatively reasonable cost.
DESCRIPTION OF THE INVENTION
It has now been found that meltable fats can be converted into low-viscosity dispersions of relatively high solids concentration using very small quantities of certain nonionic emulsifiers.
SUMMARY OF THE INVENTION
The present invention relates to aqueous dispersions--flowable at 20.degree. C.--of water-insoluble fats meltable at a temperature in the range from 30.degree. to 100.degree. C., characterized by a content of:
(A) 25 to 60% by weight of one or more fats
(B) 0.1 to 1% by weight of one or more nonionic surface-active ethylene oxide adducts having an HLB value above 10 as emulsifier and
(C) 39 to 74.9% by weight water.
DESCRIPTION OF PREFERRED EMBODIMENTS
Suitable fats (A) are paraffin hydrocarbons and any water-insoluble fat derivatives melting at temperatures in the range from about 30.degree. to 100.degree. C. which do not form mixed phases with water at temperatures in that range and, more particularly, do not form liquid crystalline phases or gels at temperatures in that range. Examples of suitable fats are, above all, C.sub.14-22 fatty alcohols or mixtures thereof. C.sub.12-22 fatty acids or mixtures thereof, fatty acid/fatty alcohol esters of C.sub.12-22 fatty acids and fatty alcohols, C.sub.16-44 dialkyl ethers, ethylene glycol or propylene glycol difatty acid esters or fatty acid triglycerides of C.sub.12-18 fatty acids and mixtures of these fats.
Particularly suitable emulsifiers (B) are nonionic adducts of ethylene oxide with fatty alcohols, fatty acids, fatty amides, fatty acid alkanolamides, fatty acid monoglycerides, fatty acid propylene glycol monoesters, fatty acid sorbitan partial esters or with other fatty acid polyol partial esters, with alkyl monoglycosides or oligoglycosides, with methyl glucoside monofatty acid esters and with alkylphenols. The emulsifiers mentioned should contain a C.sub.12-22 alkyl or acyl group. The ratio by weight of hydrophilic to lipophilic groups in these ethylene oxide adducts should be such that the weight of the hydrophilic polyethylene glycol ether groups formed by ethylene oxide and the polyol ether groups should make up about 60 to 96% by weight of the molecule as a whole. In these ethylene oxide adducts which are suitable for the preparation of the fat dispersions according to the invention, the HLB value according to the equation HLB=(E+P)/5 (where E is the content of oxyethylene groups in % by weight and P is the content of polyolether
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Kawa Rolf
Paasch Stefan
Tesmann Holger
Bhat N.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Lovering Richard D.
Szoke Ernest G.
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