Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1997-07-30
1999-01-26
Lovering, Richard D.
Compositions
Inorganic luminescent compositions
Tungsten containing
252314, 252356, 424401, 514937, B01J 1300, B01F 1736
Patent
active
058634614
DESCRIPTION:
BRIEF SUMMARY
This application is a national stage filing under 35 U.S.C. .sctn. 371 of international application PCT/EP95/04628, filed Nov. 23, 1995.
BACKGROUND OF THE INVENTION
This invention relates to a process for the production of water-in-oil emulsions, more particularly of polar oil components, using block copolyesters of hydroxyfatty acids and polyether glycols as emulsifiers and stabilizers.
DISCUSSION OF THE RELATED ART
The use of block copolyesters of hydroxyfatty acid oligomers and polyethylene glycols as surfactants and emulsifiers is known from various publications. Thus, DE 24 30 342 A1 describes such copolyesters as dispersions aids for hydrocarbon oils. EP 0 000 424 B1 describes block copolymers of 12-hydroxystearic acid oligomers and polyethylene glycols as co-emulsifiers for emulsifying diesel oils.
However, it has been found that the block copolymers described in those documents, which contain 30 to 62% by weight of polyethylene glycol units, are unsuitable for emulsifying water in polar oil components.
In DE 43 15 172 A1, it is proposed to use a combination of the block copolymers known from EP 0 000 424 B1 with other w/o emulsifiers having an HLB value of 3 to 7 for emulsifying water in triglyceride oils.
SUMMARY OF THE INVENTION
It has surprisingly been found that, by reducing the percentage content of the hydrophilic group of such block copolyesters, the water-in-oil emulsifying properties can be improved which has a favorable effect for polar oil components in particular.
Accordingly, the present invention relates to the use of block copolyesters corresponding to general formula I: O).sub.z --COR.sup.1 (I) hydroxyfatty acyl group containing 16 to 22 carbon atoms, (OR.sup.2 CO) is the residue of a hydroxyfatty acyl group containing 16 to 22 carbon atoms, x is a number of 5 to 150 and y and z are numbers of 2 to 75, the group (OC.sub.2 H.sub.4).sub.x making up 10 to 20% by weight of the molecular weight, for stabilizing water-in-oil emulsions.
DETAILED DESCRIPTION OF THE INVENTION
The block copolyesters corresponding to formula I are particularly suitable as emulsifiers for water or aqueous phases in polar oil components. Polar oil components are understood to be oils which contain 1 to 4 ester groups or ether oxygen atoms in the molecule. Accordingly, one preferred embodiment of the invention is characterized in that monofunctional or polyfunctional esters of C.sub.8-22 fatty acids or C.sub.8-22 fatty alcohols or ethers of C.sub.8-22 fatty alcohols containing 16 to 70 carbon atoms are used as oil components for the water-in-oil emulsion.
The polar oil components are preferably liquid at 20.degree. C.
Examples of such oil components, which are preferred for the production of water-in-oil emulsions, are fatty acid esters such as, for example, butyl stearate, cetyl oleate, isotridecyl stearate, oleyl oleate, jojoba oil, ethylene glycol diisostearate; fatty alcohol esters such as, for example, oleyl acetate, isotridecyl benzoate and diisooctyl sebacate; and triglyceride oils such as, for example, olive oil, sunflower oil, soya oil or palm oil.
The production of the block copolyesters is known per se from the literature and may be carried out, for example, by initially preparing the lipophilic part of the molecular by polycondensation of a hydroxyfatty acid. Either y or z moles of a hydroxyfatty acid may be condensed onto a non-hydroxylated carboxylic acid with the formula R.sup.1 COOH as starter molecule. Alternatively, the hydroxyfatty acid HO--R.sup.2 ---COOH may simply be subjected to polycondensation, in which case the hydroxyfatty acid itself serves as starter molecule (i.e. R.sup.1--HOR.sup.2).
Suitable hydroxyfatty acids are, for example, 12-hydroxystearic acid and other synthetic hydroxyfatty acids obtainable, for example, by hydro-genation of the epoxyfatty acids containing 16 to 22 carbon atoms. Particularly preferred hydroxyfatty acids are ricinoleic acid and hydrogenated castor oil fatty acid. The polycondensation is preferably carried out in the presence of an acidic catalys
REFERENCES:
patent: 2269529 (1942-01-01), Goldsmith
patent: 3776857 (1973-12-01), Lindner
patent: 3926840 (1975-12-01), Wendler et al.
Ansmann Achim
Conradi Joachim
Kawa Rolf
Schieferstein Ludwig
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Lovering Richard D.
Murphy Glenn E.J.
Szoke Ernest G.
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