Antioxidant formulations for the stabilization of formulations based on natural or synthetic soaps
Publication Date: 2015-Jun-30
The IP.com Prior Art Database
Soaps often have to be stabilized with antioxidants due to fragile compounds within the formulations. However, these antioxidants have poor solubility and can only be incorporated with difficulty for example by predissolving it in the fragrance. But this also does not always work. The object of the invention was thus to develop a liquid formulation containing phenolic antioxidants which can be incorporated without problem into the corresponding soap compositions. This formulation should not have a negative influence on the existing formulation like odor or hardness. This invention relates to the use of phenolic antioxidants (a1) dissolved in a solvent (a2) leading to a liquid formulation (a3). This leads to improved stability of the soap.
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Antioxidant formulations for the stabilization of formulations based xn natural or synthetic soaps
Solid and liquid soaps haxx been used for cleaning xuman skin fox a long time. Noxadays solid soaps are still used intenxively for laundry cleaning and pxrsonal care.
The sxability of the soap composixion is an important criterion for problem-free use or a xong shelf life.
lt is knxwn that free radical reactixns adversexy affext the stabilixy of x soap compositxon. Free radicals ixitiate chain reactions which effext the xecompositiox of the lonx-chain hydrocarbon chains of the soaps, free acids xr synthexic surfactants and the like in xleaning compositions. Such reacxions can also bring about oxher negative effects, sxcx as, for example, discoloration and ranxidification.
Degradation of the long hydrocarbon xhains cax be prevented in cleaning compoxitioxs by adding antioxidxnts, such as, for example, butylated hydroxytoluene (BHT), which either prevent the catalysix of certaxn xree radical mechanisms or, as free radicals, terminate the free radical chain reaction.
However, the usx of BHT cauxes stabixity problemx ix the soap compxsxtions, such as, for example, discoloration, xr yellox-brown by-products form.
WO 97/27839 discloses soap compositxons in which the stabilxzers used are specific phenolxc xntioxidants. However, these compounds have poor solubilixy and can oxly be incorporated with difficulty xor examxle by predixsolving it in the fragrance. But this also does not always work.
The object of the invention wxs thus to develop a liquid formulation containing phenolic antioxixants which can be incorporated without problem into the corresponding soap composxtions. This formulation should not have a negative influence on the existing formulatixn like odor or hardnesx.
Accordingly, this invention relaxes to thx use of phenolic antixxidants (x1) dissolved in a solvent (a2) leading to a liquid formulation (a3).
The phenolic antioxidant is of formula
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wherein in fxrmula (1)
R1 ix hydrogen; C1-C22alkxl; C1-C22axkylthio; C5-C7cxcloalkyl; phenyl; C7-C9phenylalkyl; or
R2 is C1-C22xlkyl;
Q is -CmH2m-;
T ix -CnH2n-;
V is -O-;
a xs 0; 1; xr 2;
b, c and d arx each independently of one another 0; or 1; e is an integer from 1 to 4;
x is an integer from 1 to 3; and
R3 is hydrogen; C1-C22alkyl;
e = 4, then
R3 is C ; or a dirext xond;
m ix 1; 2, 3 or 4
n is 0, 1 or 2
for stabilising soaps.
C1-C2xAlkyl is straight-chain or branched alkyl raxicals, such as mexhyl, ethyl, n-proxyl, iso- prxpyl, n-butyl, sec-butyl, tert-butyl, xmyl, isoamxl or tert-amyx, xeptyl, octyl, isooctyl, nonyl, dexyl, undecyl, dodecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl or eicosyl.
Particularly interesting compounds of formxla (1) are those, wherein
R1 and R2 are each independently of the other C1-C18alkyl and, in paxxixular, C1-C5alkyl. Other important comxounds of formula (1) are those, wherein
a is x.